Category: General News

Hey everyone. Thanks for following along in the development of our new generation of CNC machines.

As we discussed in our previous blog posts, we’ve been working on making our own custom extrusions for a new generation of LongMills. Just to recap, here are some of the improvements that the new extrusions should bring:

• Improved weight to rigidity, as well as improved rigidity overall
• Lower number of parts and overall ease of assembly
• Ability to extend the working area beyond 30×30 inches

We’re excited to share that we’ve put together our first machine with the new parts and gantries to make a fully working prototype. We’re really happy with the way it’s come together as well as the overall fit and finish of the machine. Now that we’re at this stage, we have a couple more steps towards launching the product.

Beta testing the MK2 30×30

Now that we have parts ready for the 30×30 version of the LongMill MK2, we are looking for beta testers to test the machine between November 2021 and Jan 2022. We are looking to get beta testers set up with machines as soon as possible. If you want to sign up as a beta tester (only for the 30×30 model, you can fill out the form here:

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If you want to fill out the survey/form for the AltMill and extended versions of the LongMill, please visit: https://forms.gle/oQPgE9s15i74b6qDA

What does “beta testing” mean?

Beta testing involves the process of testing and using a product in a real-world environment before mass production or general release. In our case, the LongMill MK2 platform is a new product that has been active in development. While we are confident in the performance of the new machines, we feel that it is important to get it into the hands of real users to obtain feedback and information about how well the machine performs, how it works, and potential issues that may happen in manufacturing and production of the final product. We also want to identify users and use cases for the product to help us target our machines to the right people based on what you do during the beta testing period.

As a beta tester, your responsibilities are:

• Put your beta machine through the paces
• Report back to us with feedback on a regular basis
• Let us observe and test your machine
• Share your learnings and testing with the community

As the company providing the beta machine, our responsibilities are:

• Provide you with one-on-one technical support for your machine
• Help you set up your machine (either in person or virtually)
• Provide you with updated parts to ensure your machine aligns closely with the final production version

There are several differences that you may see between the beta testing machines and production machines. 

• Some parts will be uncoated, such as the gantry plates and aluminum parts
• Machines will either be partially assembled or come in non-production ready packaging
• Some parts may be off the shelf components not from our regular manufacturers

Once beta testing is complete and we begin production for completed units, we will provide you with updated parts to bring you to spec with production machines.

Pricing

We charge for our beta testing machines. We believe that is the best way in vetting between folks that are purely looking for a discounted or free machine and folks who truly need or want a machine. It is our top priority to work with beta testers that will find true value from owning a CNC machine and using it long-term. We ask beta testers to ask themselves “if this was a product I could buy now, would it bring enough value to me to warrant the amount I would pay?”.

If you’d like to hear some interviews from our former beta testers, please check out our channel here: 

The LongMill MK2 30×30 serves as the successor to the original LongMill that we started shipping in late 2019. This version of the machine offers simpler, but more rigid construction, and is a great entry into the world of hobby CNCing. 

Pricing:

The pricing for the beta LongMill MK2 30×30 will be $1500CAD, plus applicable taxes. 

The production price will be $1800CAD at the time of release.

What you get:

• A full, LongMill MK2 machine with a working area of 30×30 inches
• Our one-on-one technical support and set up assistance
• Parts to upgrade your machine to production level spec at release

Talking about the now (and the later)…

I’d like to talk about customer perception and management of the release of a new product. The elephant in the (my) room, is the fact that while the LongMill in its current state is awesome, the new one is going to be even more awesome. If you are an older customer, I’m hoping that you’ve been enjoying using your machine and feel that you’ve gotten the value out of your machine. For new customers, I suspect that some folks are either possibly feeling that 1) maybe they should have waited to get the new version 2) worried about losing support on the current version.

To address the first concern, the reality is that as time goes on, our machines are going to get better. Even between the first generation of machines, we’ve made a lot of changes to make the machines better. The machines that we ship today have many changes and improvements, and we pride ourselves to build the best machines at reasonable prices. The point is, if you use this logic forever, you’ll also be waiting forever to get a machine. The real question should be, is this the best time for me to get a CNC machine?

We also have to talk about the change in price. The original LongMill 30×30’s base price is $1500CAD. The new one will be $1800CAD. We are increasing the price of the machine for a couple of reasons.

First of all, we need to address increasing costs, inflation, and instability in prices over the last two years. We have not increased the price of the LongMill since 2019. We also have not increased the price on most of our parts, consumables, and other items we sell. Because of our growth, we’ve been able to keep prices for our customers the same while being able to negotiate lower prices with our suppliers due to our economies of scale, we no longer see better cost breakdowns at our scale to significantly make up for lost margin of prices going up. We also continue to increase the pay and benefits of our staff. We believe in providing an excellent workplace environment and reasonable pay, but we also need to account for these costs as well. The $300 difference addresses the increased costs of the materials that go into production and ensure that we have the profits to pay our employees well.

Second, the price difference accounts for the performance difference between the two machines. The MK2 is a more rigid machine, and it costs more to make. At this point, we offer a bit of a choice between the two machines with their respective price points.

And lastly, when customers choose to purchase from us, Sienci Labs, they are also investing in our company and the development of new technologies and products. For example, a bit portion of our profits go towards building and supporting gSender, which now is open for use for free for all hobby CNC users. We also have a bunch of other cool stuff coming down the pipeline that the money goes towards to as well. We want to make sure our pricing is in line where these developments are sustainable in the long term and we can provide our team with the funding needed.

To address the second concern, we’ve made a lot of the two machines inter-compatible and backwards compatible. I go into a lot more detail in the last blog post: https://sienci-upgrade3.cospark.io/2021/10/15/altmill-and-longmill-survey-results-and-development-progress/, as I cover more pros and cons of this change. Wear components, such as v-wheels, ACME nuts are the same across both machines, and both machines also share the same electronics, power supplies, bearings, linear guides, motors, locking nuts, couplers, and more. We will have parts and services available for both generations of machines, as well as a stockpile of parts on hand. We can also make 3D printed components as needed, so we don’t expect any issues there either. Since the underlying software and electronics remain the same as well, all of our software will continue to be developed with both machines in mind.

To also note, for some people who might be wondering, making a dedicated kit to swap out rails and gantries to change a current LongMill to a MK2 is not our priority. We don’t think the extra cost doesn’t justify the real-life increase in performance, we don’t want to create a lot of extra waste, and if a machine is already assembled, most of the benefits that come with the faster/easier assembly is never realized (since you have to take apart and reassemble a machine). We will still offer individual parts on our store for customers (as we already do), so folks can make up their own mind. I’d also like to note that there WILL be a kit to use the original LongMill and add a longer X-axis (48×30 in the working area).

So in conclusion, if the LongMill at its current design and price point works for you, and you’re thinking of ordering a machine, this is a great time to do so. If you want a bit more rigidity and have a larger budget, the MK2 may be the better option. But regardless, you’ll still be getting a fantastic machine, and I would recommend making your decision based on your personal timing of when you want to get into CNCing.

Availability

The LongMill MK2 30×30 is expected to launch in mid to late January 2022. Pricing for the 30×30 model will be $1800CAD.

Please stay tuned for when orders will open up, and pricing for other size models.

Halloween is coming up! We have a Halloween themed contest going on at the forum, with prizes to be won.

https://forum.sienci.com/t/halloween-contest-2021/3948

All submissions must be on the forum, so that we can keep track of participants easier.

We also want to get more people active on the forum, so make sure to sign up and explore everything it has to offer.

Hi everyone. Thank you to everyone who took the time to fill out our survey. We received an overwhelming amount of responses which has helped us get a better understanding of what our users are looking for in a new machine. Here’s a bit of a breakdown and a report of what we learned from your responses.

General learnings

As expected, almost all of our respondents shared that they used their CNC machines for woodworking. Also as expected, almost all respondents expressed interest in increasing the working area of their machine.

I was very happy to see that most respondents use their machine actively, with the approximate per week usage for most users being 15-30 hours per week. About a third of our respondents who use a LongMill reported that they use their machine 20 or more hours per week, which suggests that many of our users use their machines in small-scale production.

As we get into larger machines, power becomes more of a concern. We initially were worried that people would not have access to 220V/240V power in their shops (at least in North America), but it appears around half of the respondents who chose to answer this question have access to 220V outlets. This indicates that we should consider supporting both 110V and 220V spindles in future machine designs.

Interest between the AltMill and the Extended LongMill

We see about a 60/40 split in overall interest between the two machines. For LongMill users who are interested in upgrading from a LongMill to an AltMill shared these common sentiments:

• Want to have a more rigid machine, generally to be able to use spindles and cut faster
• Want to have integrated limit switches or homing switches
• Want to be able to handle larger projects and half sheet
• Want more speed
• Have some complaints about parts such as the v-wheels and delrin nuts

For LongMill users that are interested in extending the size of their machine shared these sentiments:

• Heavily value the community support and affordablilty of the LongMill in its current state
• Would like general improvements to rigidity and design of the machine
• Want a way to tram
• Improvements to the v-wheel and eccentric nut system

Many people indicated an interest in a spindle option for both the LongMill and AltMill. The AltMill will be designed and compatible with spindles. While we don’t currently recommend using a spindle with the current design of the LongMill’s Z-axis because of weight and size, one option we are exploring is to build the XZ axis assembly for the AltMill to be compatible with the LongMill. This should let us be able to share development efforts for the assembly across both machines. Allowing additional cross-compatibility between motors and electronics between LongMill and AltMill should also make it possible to upgrade more aspects of the LongMill as well.

Development progress (LongMill)

We’re excited to share that we’ve gotten our first batch of custom aluminum extrusions in for the new iteration of the LongMill. These rails were made for our prototyping and beta testing before starting a larger production batch.

We are planning on using custom extrusions for the next generation of LongMills. We’ll refer to them as LongMill MK2s (at least for now). The goal with this generation is to provide the same straightforward, rigid, and affordable machine at the current sizes that we offer, but allow us to provide extended versions of the machine.

I think it’s important to talk a bit about custom extrusions, as it is a big departure from our original angle aluminum design.

When we first started Sienci Labs, we found that using angle aluminum turned on its side provided a sturdy, simple, and affordable way to create a linear motion system. Given that aluminum angle extrusion was readily available off the shelf, we were able to create both small and large batches of rails quickly and easily, without worrying about custom tooling and MOQs. I would attribute this factor as an important reason for getting us to this stage in our company, as we were able to continue to scale our production as we continued to build more CNC machines.

Creating custom aluminum extrusion was always on our mind, but until recently, it was not feasible for us due to cost, and the volume we would need to make didn’t make sense at our scale. At today’s scale, we’ve learned some important things that justify making our own extrusions.

The first area to talk about would be the accuracy of rails over high volume. Since last year, we encountered a new problem. While all of the angle aluminum we had received in previous batches were made to high tolerances, we had received a new batch of material that varied in the length of each arm and angle, causing less than an optimal fit of v-wheels. This gave us an opportunity to look deeper into tolerances in extrusion manufacturing as well as performing additional quality checks to ensure each rail was made to a high accuracy. We also learned that it would be a reality that at high volumes, it would be important to ensure we tackle issues at the production side with our manufacturers, since we couldn’t trust them to make every rail perfectly unless we provided the correct specifications for the rails.

This lead us to make our own “custom” angle aluminum. Basically, we arranged production of the angle aluminum using a new die made specifically for us at a higher tolerance than the industry standard, as well as extruding the material at precision spec. With these changes, we were able to reduce the number of out-of-spec rails to near zero. This also set up a better understanding of the extrusion process and the process and costs involved in it. It also gave us a chance to work with the extrusion manufacturer to work out design kinks and set us up for future development.

Today, we use tens of thousands of pounds of aluminum a year to make our rails, way beyond practical MOQs for producing custom extrusion. We are able to spread the cost of the dies over the thousands of rails we produce to make it an affordable option as well. So financially and scale-wise, custom extrusion is a feasible option. So let’s talk about why custom extrusion makes sense, and some cons/downsides as well.

Improved performance

Designing our own custom extrusions lets us create a design that is more optimal for rigidity than angle aluminum. Chris conducted dozens of simulations and tests to find the most optimal designs for the new rails. Based on the results, we can expect 2-3 times less deflection in the rail than the original design. I would note that these are simulations, and real-life results are likely to show less of a difference since the numbers do not reflect deflection from v-wheels, linear guides, and other parts in the machine.

This is especially important as we continue the development of larger versions of the LongMill since longer rails inherently have more deflection.

Ease of assembly

The new extrusions also include additional features that will make it easier to assemble and require fewer parts. For example, by including tapped holes on each face of the extrusions, users will be able to mount the rail to the gantry plate without any brackets. Each rail also has a t-slot, so all drag chain components can be mounted without additional tapped holes. Overall this will reduce the number of fasteners needed, the number of unique fasteners, as well as assembly time and complexity.

Improved scalability

Although time will have to tell, we expect that the new rails will be easier to produce at a larger scale. Since we already need to custom manufacture our own angle aluminum, lead times for both the angle aluminum and custom extrusion are the same. Since the custom extrusion requires less machining, we expect it to be slightly easier and less expensive to process the rail after it has been extruded. Also, since the rail requires less parts and a lower number of unique parts to put together the overall machine, it will save time and effort in sourcing and purchasing as well.

We are also working on cutting and tapping rails in-house, allowing us to have more flexibility in the sizes and variations in the machines we produce as well.

Less production flexibility and a step away from replicability

Since angle aluminum is a fairly universal product that can be purchased off the shelf, a determined maker should be able to replicate the rail design of the LongMill and make their own custom machine from scratch. It would be much more difficult to replicate the new custom extrusion, as the costs to produce a small number of rails are incredibly high. This, I feel, is a step away from the openness of the platform. We will continue to fully open-source the designs as we have always done, but part of the open-source movement is considering the replicability of the product. This was an important consideration when we started this development, and these are some considerations and why we made this step:

• The number of people who make their machine from scratch is incredibly low. While there are people who use the LongMill design to make their own machine, making the designs available for this purpose serves a very small population.
• The net benefit of having a simpler, better machine that is more easily scalable provides more benefit in our goal to make CNC accessible to beginners than to have a machine that can be made from scratch.
• Most people who make modifications to their machines generally do it after they purchase and assemble a manufactured kit. Continuing to make the design public will continue to support people who wish to simply modify a kit
• Building a machine from scratch generally costs more and will not perform better than a stock LongMill. We have extensively optimized the design and put an insane amount of thought and consideration to the quality of each part. Parts such as the couplers, Delrin nuts, and even the 3D printing filament are all custom made specifically for us at a higher tolerance than off the shefl components. Since we work within high volumes, we are also able to take advantange of economies of scale that do not come with buying parts in small numbers. Because of this, I believe that folks who want to build a machine from scratch would only benefit if they plan on making extensive changes to fit a specific need, or are doing it for the fun of making the machine. There are of course other designs and options that people can build besides the LongMill that lend itself in being made from scratch.

Backward compatibility

While the rails have been designed to be as backward compatible as possible, and many of the old LongMill parts can be used on the new rails, this brings up another important debate, which is “is it better to take apart and modify an old LongMill to put new parts on it, or is it better to buy a new one?” This is what I think.

First of all, if you already have a LongMill and are happy with the current size of it, I believe that keeping it the way it is and continuing to use it is the best option. While the newer versions of the LongMill will perform better, not only does the current version work well already, the extra cost to switch over parts isn’t worth the extra performance you may get. Instead, investing in other things, such as better tooling, software, and materials for projects may give a better return on investment. It should also be noted that the price of the MK2 LongMill will be higher than the current LongMill, so that we can account for changes in material prices, cost to build the machines themselves, and inflation.

If you are wanting to upgrade the machine to a larger size, then the debate gets a little more tricky. If you take apart your old LongMill to swap in new rails and lead screws, you’ll be left with a lot of leftover parts. Instead, it may make more sense to sell the LongMill and buy a whole new machine instead. So the formula would go:

(Cost to buy a larger LongMill – Price you sell your old LongMill) v.s. Price of the upgrade

I personally like the idea that instead of having this be an opportunity for a new user to scoop up a used LongMill at a discount so that they can get into the CNC hobby and prevent having a bunch of unused parts lying around. The net number of machines is one instead of two.

Of course, we will offer both an upgrade kit and full kit options to customers. These parts are interchangeable between all generations of the LongMill:

• Motors and electronics
• Lead screws, couplers, and nuts
• V-wheels, fasteners, and eccentric nuts
• XZ gantry assembly
• Drag chains

Development progress (AltMill)

We’ve completed the baseline CAD design for the AltMill and are currently in the process of having our first prototype machined. We expect the parts to arrive in mid-November. This will be our first fully functional prototype which will be used to test performance and make design changes.

Next steps

We’ll be talking about next steps for sales and beta testing of these products. If you wish to sign up for beta testing, please fill out our survey: https://forms.gle/XZgWCi1TagmYytZ87

LongMill/Extended version of the LongMill

We are waiting on a couple more parts to arrive to start building working versions of the LongMill MK2, at which point we’ll be contacting and working with beta testers.

Parts that we are still working on making include:

• Steel Gantries
• Feet and Z axis mount
• Thicker lead screws (for larger versions of the LongMill)

We expect the first two parts to be ready in the next 2-3 weeks, with the thicker lead screws arriving in about a month.

AltMill

The prototype parts are currently in production. We will be building one single prototype and putting it through the paces. Once we’re happy with the performance of the machine, we’ll be opening up pre-orders for beta testers. We expect this to happen around the end of the year or start of 2022.

Hey everyone, Andy here. I’m here to announce that Vectric VCarve Pro is now available for sale on our store.

We first offered Vectric VCarve Desktop for purchase through our store after many LongMill users praised its ease of use, a wide array of resources, and powerful features that made it worth the price. Over the past year it has become one of my go-to programs for creating gcode, as it has been proven to be easy to use and come with many presets and features that I have found useful.

One very significant downside to using VCarve Desktop is its size limitation. The software limits you to projects to up to 25″x25″. This of course leaves several inches of wasted potential for LongMill users that have a 30″x30″ work area or requires users to split or tile projects. Here’s an example of one of my personal projects making a trim piece for my old Volvo out of plywood that required splitting the project into several pieces.

Vectric Pro does not have a size limitation. This, of course, comes at a price. While Desktop is priced at around $460CAD, Pro is priced at $896, a +$400 difference for the convenience of having a little extra working area and a couple of other extra features.

I still firmly believe that all new users should try out free software, as discussed in my previous article. But for advanced users who are making their bread and butter with their machines, it is easier to justify paying for software if it can save time and improve productivity. Initially, when the LongMill first was released, all of our users were new to CNC, which meant that we were focused mostly on helping beginners by focusing on supporting and recommending free and low cost software options. Now, with many users having had used the LongMill for a long time, we now have a growing community of advanced users who demand more functionality from their machines, some of which already have VCarve Pro and other paid software. So to cater to this growing community, as well as prepare for future machines such as the AltMill, which will focus on production and larger scale CNCing, VCarve Pro is now available for purchase on our website.

Just as a side note, we’ve updated the license distribution process so that all licenses get sent out automatically. This means that if you place an order for any Vectric software on our store, you will get an email with the license details right away.

One of the most frequently asked questions at Sienci Labs is “Can you build a bigger version of the LongMill?”. Well, I just want to assure everyone we have been actively working on the development of 1) an extended version of the LongMill and 2) the Altmill! Although we’ve been working on these projects for a couple of months now, these projects are still quite early in their development and we don’t have a ton of details to share. The purpose of this announcement is to start getting our community involved by learning what sort of machines and features folks are looking for. If you’re interested in being involved in this process, please make sure to fill out the survey.

What is the extended version of the LongMill?

Well, I guess it’s in the name. We’re working on a version of the LongMill that uses the core components of the original machine, but extends the rails and leadscrews to add more working area to the machine. The goal is to have a LongMill 30×48 or LongMill 48×48 machine. We expect to be working in a price point of around $2000-$2500 for a full extended version of the LongMill, with kits available for adapting pre-existing models of the LongMill to the larger size as well around $800 to $1000. Please note that pricing is an estimate at this point and may change.

What is the AltMill?

The AltMill is a new machine that we’ve been working on that focuses more on the more industrial/production end of the spectrum of hobby CNCing. This means linear rails and ball screws, more powerful motors, and other features that are designed for more intense CNCing. We expect to be working in a price point of around $3000-4000 for a 48×48 inch working area.

Timeline

Extended version of the LongMill

We are currently in the early stages of manufacturing prototypes of the rails for the extended version of the LongMill. We will be conducting testing between October and November, to push for a December or early 2022 launch.

AltMill

We are currently building to scale prototypes with wood, with plans to start producing prototypes from aluminum in the coming months. Due to the scale and complexity of the project, we expect to have working versions of the AltMill at the start of 2022 with a launch for the AltMill in mid-2022.

Beta testing

If you wish to be part of our beta testing program, please fill out the survey. You will be able to provide your information at the end of the survey.

General challenges of the project

Building larger machines also prevents new challenges. Here are some things that we’re working on addressing. We also discuss this topic specifically about the LongMill here: https://sienci-upgrade3.cospark.io/2020/06/05/things-to-consider-when-making-a-longer-longmill/

Rigidity

Longer rails have more flex, which means that we need stronger rails to compensate. For the LongMill, we are currently working on a new rail design that improves rail rigidity while keeping overall weight down. This should help keep similar levels of overall rigidity in the machine and allow users to run their machines with the same speeds and feeds as any smaller LongMill.

The AltMill on the other hand will use stronger linear rails and bearings, as well as a solid aluminum structure to ensure a high degree of rigidity.

Squaring

Our machines rely on both Y rails to be parallel with each other and perpendicular to the X rail to ensure that the machine doesn’t rack or cut out of square. With the LongMill, we can generally rely on our table mounting procedure to ensure that the machine is square, but the larger and heavier the machines become, the harder it becomes to square the machine properly.

To account for this, there are a couple of options:

• A table which uses precision cut parts to help square the machine
• A tool or measuring device included in with the machine
• Making the machine smaller

A table, in my opinion, offers the most precise way of keeping the machine square, which is why we are developing additional structures to support the machine that can use similar or same designs between both the larger LongMill or AltMill.

Beyond this, gSender also offers a calibration tool that will play a more integral role in working with larger machines.

Mounting

Although a LongMill 30×30 fits perfectly on a 4×4 ft sheet of MDF, it is generally difficult to find sheets larger than this for mounting larger machines. One option is to cut and join multiple smaller sheets into a 5ft or 6ft square base to mount a machine on or have a pre-built bench or table that the machine mounts to, with space in the middle to put a larger wasteboard.

In terms of a 30×48 LongMill size, customers could purchase a 4×8 ft sheet and cut it down to 4×6 ft size to mount the machine to. However, 48×48 machines and the AltMill would need to use an alternative method.

In this case, having a table would also offer a good solution to this issue.

Power

The larger a machine gets, the more power it needs. This means larger motors and drivers. This is because:

• The parts that make up the machine that need to move are larger and heavier
• We want to cut faster so that larger projects don’t take forever

I generally use the rule of thumb that no matter how large or small the machine is, you want the machine to be able to travel between the lowest left corner to the highest right corner in the same amount of time. So this means that the machine needs to travel faster the larger it is.

We are currently working on either using larger motors as well as optimizing the power from the stock LongMill NEMA 23 motors.

Spindle and router choices

The bigger and more powerful the machine becomes, the router or spindle power becomes a limiting factor. Although I believe that the Makita router we recommend for our LongMills should be able to handle anything for the extended versions of the LongMill, a spindle may be necessary on an AltMill. Here are some hurdles to get over with spindles:

• They are larger and weigh more, thus needing more hardware to support on a machine
• Have higher power requirements, which means that users will also need to make sure their workplace can support it
• Require additional wiring, which adds additional complexity
• Generally not available in retail, which means that we have to source a spindle manufacturer and ensure we do proper QA and testing

Seeing as spindles could be used interchangeably between the AltMill and LongMill, this opens up the opportunity to offer spindles for both machines as well.

Shipping

Larger machines are larger and heavier, making it harder and more challenging to ship. The current shipping weight of the LongMill 30×30 is around 60lbs. Although fairly manageable, any heavier and larger than this, I feel would be unwieldy for the average user. Not only that, larger, heavier packages are more prone to being damaged during shipping, which is something we definitely want to avoid.

I expect our larger machines to be way bigger and heavier than this, and I estimate that weights will start to exceed 100lbs. This means either shipping the machine in several separate boxes, as well as figuring out the best way to handle the tracking and logistics on this.

Our goal is to continue to make it possible for us to ship by courier (UPS/Canada Post) to ensure that customers don’t need to worry about freighting. This should make our machines more accessible for the general public.

Pricing

Because of all of the factors discussed above, larger machines cost more. As with the current LongMill, our primary goal is to provide the best possible value by lowering manufacturing costs with the most optimal designs. We do make certain decisions, some good and some tradeoffs to achieve competitive prices. Here are some examples:

• Using standard extrusions for building tables – easy to source and build with
• Reducing the number of variations of the machine to take advantage of economies of scale (no custom sizes) – reduces the amount of different types of support and resources we need to create as well as reduces machine complexity by not needing to design high customizability, but means customers have less choice in the size of their machine.
• Assembly required by the customer – better understanding on how the machine works and saves costs on in house assembly labour, but would take longer for customers to get up and running

On the other hand, there are some changes that will add costs that we feel are worthwhile to spend money on:

• Partial assembly of the AltMill to ensure proper assembly of linear motion components – we are able to create jigs and tooling to make in house assembly and calibration easier than most customers
• Tables and other mounting options for larger wasteboards and machines – ensure proper squaring and make it easier for the user to set up their machines
• Larger lead screws and ball screws – Although more expensive, larger screw drives are needed to prevent whip which are more apparent in larger machines

Hey everyone here’s an update on the development of the inductive limit switches for the LongMill! If you haven’t read the last post, you can read it here: https://sienci-upgrade3.cospark.io/2021/07/30/longmill-limit-switches-coming-soon/

I know a lot of people are excited about this kit, and I assure everyone we’re working really hard on this. Over the last couple of weeks, we’ve been working on a couple of different things, including video and written info and content, continual testing, assembly instructions, packaging, and the supply chain for the kit. We are now waiting on our first batch of sensors and a couple of other parts to arrive from our manufacturers, and we will be starting packing and assembling the kits as soon as parts start to trickle in. All of the parts for the kit have been ordered and are expected to arrive in mid-September. We expect to start shipping kits a couple days after we’ve received all of the parts. Kits will be $60CAD or around $48USD each.

Our initial timeline for this project was to have a product released at the end of August. However, we had a minor setback due to some changes in part price and availability from one of the sensor suppliers that we initially ordered and tested samples from, so we have acquired samples from two additional suppliers, one of which we’ve fully tested and have decided to move forward with to use for production.

Some a bit more specifics that we’re working on to provide users include information about using different workspace coordinates, returning to a certain part of your job after a power outage or shutoff, and using jigs, which should add some extra tricks and functionality users can add to their machines.

Making your own

As promised in the last post, here are some instructions on making and assembling your own mounts and sensors if you prefer making your own over buying the kit from us.

Please note that these instructions are still in development, and additional resources and videos will be available for users soon. These instructions should help the general user population if they wish to make their own mounts and sensors.

Choosing sensors

The sensors we recommend using are:

Model: LJ12A3-4-Z/BX

NPN Detection

Detection distance: 2mm-4mm

Normally open

Supply Voltage: 5V* 

Choosing the correct voltage option is very important, as this particular type of sensor is more commonly available in a working voltage of 6-36V, which requires additional wiring to make work with the LongBoard. For using higher voltage sensors, you may need to use either the 12V auxiliary power from the board, 24V from the power supply, or from an external power source. That being said, I highly recommend sourcing the 5V variant of the sensor as this will make installation much more simple.

There are many variations of the LJ12A3-4-Z/BX, as well as other M12 sized barrel sensors that come in different lengths. In my experience, most seem to be more than accurate enough for this application, with a repeatability of 1 thou or better.

Most sensors also come with a set of nuts and washers, which can be used for mounting.

Making the mounts

All mounts can be 3D printed. The models can be found on our public Onshape document for the LongMill. The models can be found under Electronics -> Limit/Homing Switches. Right click on the model to export as an STL or your preferred 3D model file format.

These parts can be printed with most FDM printers. If you’re interested in reading about our 3D printing process, please check out this post. I would recommend using a higher infill for these parts since a more rigid part generally helps mounting.

All of the mounts use a pair of M3 heatset inserts. CNC Kitchen has a couple of videos on using threaded inserts on 3D printing that are awesome which talk about them in general as well as how to install them.

For our application, we found a fairly inexpensive and commonly available insert that works great. A drawing of the insert can be found below.

Here is an exploded view of the inserts.

Assembling the mounts

Here is a view of everything assembled before mounting to the machine.

And here is the exploded view:

Attaching to the machine

The mounts slide onto different areas of the machine as shown in the images below. Use the M3 screws to secure them. You will need to position the sensor to a position that lines up the tip (usually blue or orange) with the gantry you are sensing for. Loosen and adjust the mounts as necessary.

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Wiring

Although the sensors for our kit will come with pre-wired JST connectors with a 2.5m wire for running through the drag chain, it’s likely that off-the-shelf options will not. You will likely need to extend the wires to be able to run the wires through the drag chains.

The LongBoard comes with ports to connect limit switches via JST4 connectors or with the detachable screw terminal block. Here is a diagram of wiring the inductive sensor using the screw terminal. Note that the 5V and ground lines are shared between all of the sensors, and each black signal wire is connected to their separate axis.

More info on wiring can be found on our resources for limit switches.

Firmware settings

Once your sensors are installed you may need to update your firmware settings to enable the limit and homing functionality. A full outline of all of the related firmware settings can also be found in our resources.

Conclusion

I hope that this information helps some of our more ambition users who don’t want to wait to get a kit from us set up limit switches on their machine. I also hope that this will give you guys a head start in exploring all of the functionality in adding limit switches to your design. Over the next couple weeks, our team will continue developing the resources for the installation of the switches, so I highly recommend staying in tune on our social media and our blog, and check back on our resources page to check for updated resources!