Description
Turn your ideas into a reality with the LongMill Benchtop CNC MK2
The LongMill helps you take your woodworking and fabrication to the next level. Its range of workable materials includes any species of wood, a variety of plastics, soft metals like aluminum and brass, and a variety of machinable foams and waxes for model making or metal casting. Make signs, engravings, mid-size furniture, stands and shelves, wooden toys and games, guitar bodies, and much more! (see more in our Gallery)
We offer our machine because CNC technology opens up a whole new world of making capabilities, especially to those who have a limited shop environment or budget. Our goal is to empower you by giving you access to both a machine that’s capable of a wide range of projects and by assuring you of the assistance that you’ll receive from our team as well as our ever-growing community of machine owners: many of whom started off green to the world of CNC as well but are now happy to share what they’ve learned along the way. (see our Facebook group and Forum). We provide a complete set of resources and instructions to get you on your way to running your first job on your machine.
We designed the LongMill to be the best hobby CNC router in its class, offering rigidity, and reliability, while being easy to put together. With large extruded aluminum rails, fully supported Y-axes, 1/4″ steel gantries on all axes, and high precision MG-12 type linear guides on the Z-axis, the LongMill MK2 is the most powerful CNC router in its class and price point.
Every kit comes with all the…
- Hardware, rails, lead screws, and gantries
- Control box, wires, and motors
- Assembly instructions (online)
Assembly only takes a few hours and can be done with a set of wrenches, Allen keys, and a flat head screwdriver. There is absolutely no soldering. We’ve spent thousands of hours designing and testing the LongMill to ensure that this machine is easy to put together. If you can put together IKEA furniture, then putting together the LongMill will be a breeze.
What do you provide?
- Your own wasteboard/spoilboard (found at your local hardware store). This is the surface that you’ll be mounting your machine to. See the ‘Size’ tab above for more info.
- A router (purchase one from us, use one you already have, or find one at your local hardware store/online)*
- Tools to assemble the machine (wrenches, Allen keys, flat head screwdriver)
For routers, we recommend the Makita RT0700/RT0701. It’s reliable, powerful, is speed-adjustable to a large range (10-30K RPM), and its uniform outer body allows for versatile z-axis mounting. We’ve been using the Makita on our CNC machines for years. The LongMill MK2 comes free as standard with a 65mm router mount, which is compatible with the Makita RT0700/RT0701 and most variations of this router design. If you wish to use a different size router or spindle, please check out the other sizes that we offer.
*Routers that we supply will be 110V only (North America). If you live in a country that uses a different voltage, please purchase a router in your region.
The LongMill comes with free software and is compatible with dozens of other paid and free software. Try our Toolchain Wizard to get a quick recommendation for software that may work best for you.
Technical Details:
– Laser-cut, 1/4″ steel gantry plates for high rigidity
– Custom-designed, high rigidity extruded aluminum rails on the X and Y axis and MGN12 linear guides on Z-axis
– Delrin V wheels with variable eccentric nuts
– 4-start, 2mm pitch, 8mm diameter ACME lead screw for high torque and fast movement
– NEMA 23 stepper motors on all axis
– 3D printed and aluminum parts
– Mount for Makita RT0701C routers, or request a custom mount size
– 24V power supply (only compatible with North American voltages 110V-120V)
– Arduino board loaded with GRBL firmware
– 4A TB6600 drivers
Our machine uses open-source hardware and firmware, letting users build and modify their machines. Not only that, many of our components are standard and easy to source or 3D printable, making replacing parts easy.
*Router adapters can only be made in sizes between 52 and 80mm.
Brandon W. (verified owner) –
Two negatives. (1) Received the machine with missing parts after a long wait time on pre-order. Customer service was quick to resolve the issue and sent the parts express. (2) Assembly was relatively easy thanks to the video and assembly instructions. A thorough review needs to address a couple errors in the parts needed for certain sections of assembly. The eccentric nuts and v-wheel assembly onto the two y-axis is to subjective. Assembly and the tightness of the v-wheels is not repeatable and therefore I lack confidence in their longtime use. I still get a “noise” when rapid traveling along the y-axis even after disassembling the v-wheels and backlash nuts and reassembling. It’s better now, and the machine has made several projects with 3+ hour carves and completed with great accuracy. I hope it holds up. If there is something that I’m missing or seem to misunderstand about the v-wheel / eccentric nut assembly please let me know. All other aspects of the machine are phenomenal. A lot of thought went into the design and the main parts are very stout and robust for sure. I know you can leave the machine to do it’s work but I can’t help standing over it to watch the details as it carves and cuts. I foresee making many more projects and look forward to the company growing and continuing to support the cnc community.
Derek Carriere (verified owner) –
New to cnc’s. Ive ran several projects to date differing in size and complexity and im very pleased to date. So far my only suggestions to Sienci would be to come up with a way to adjust the tram.
Michael Homann (verified owner) –
Other than my…um screw ups it works great. Very happy.
James ETubbs (verified owner) –
I love this mk2 had start up issues and a few broken parts form shipping but was all fixed quick and have been working hard at it have told everyone that I know that ask me about it were to go and get them one
John Steffy (verified owner) –
It would help if you would supply a 5mm T-handle hex wrench in addition to the 5mm, 90 degree hex wrench. I used a T-handle and it made assembly much easier.
Stephane C. (verified owner) –
I am loving it, i am getting better at every test i make
Dave Kinnunen (verified owner) –
The machine is very impressive and great to use I just have a learning curve with the software
Christine (verified owner) –
Hubby thought the other touch plate came with the machine-we just purchased and received it now. It took him a bit longer than expected to set up, but he is loving it!
Ryan Jarvis (verified owner) –
This machine does absolutely everything I want perfectly! I’ve used it daily for the month or so that I’ve had it with no issues. The assembly instructions were probably the best I’ve ever seen and I had everything up and running in about 3 hours with no prior CNC knowledge! I can’t suggest the MK2 enough!!
William Scrote (verified owner) –
I would rate my experience with the Longmill as 5×5 but I still have some issues that I have not gotten worked out to my satisfaction. The first is the Arduino board in the control box. While I have been able to make the thing work for the last couple of weeks it started out being a problem because the Arduino board was malfunctioning. But, with the help of the service department and a couple of e-mails we found a work around the loose Arduino board. The then Square D connection between computer and control box malfunctioned so I replaced that on my own.and now works fine. Setting up the machine took a little more time than what the manual said, but overall set up was no problem. I found the hardest part was getting the machine square and the wasteboard surfaced. But when completed my machine was, according to gsender program only .82 mm out of square when I checked square.
If I had any advice to give anyone first starting out with a CNC Machine like the Longmill and you had no other CNC experience is to READ THE MANUAL. I read and reread the manual four times. before attempting to put together my machine. Taking my time and understanding the machine and its components was invaluable. DO NOT get in a rush setting up your machine.
Now having worked Construction for the last 47 years and having a degree in Architecture and Construction management is a plus for me. I know by experience that putting things together correctly is time consuming, but very rewarding.
I started out thinking I would use this CNC Machine to add a touch of class to the furniture I build. Now I am amazed at the world of possibilities that are available with this machine. Simple flourishes and designs in furniture is just the beginning.
My hobby shop is in my two car garage in Hawaii. I also park my truck in the garage so space is limited. To help with the space issue all my large tools and machines are on wheels the same goes for my new CNC machine. It also has a tilting bed so it will take up less space. Now I find that with this tilt bed I created a small problem for myself where the CNC Machine is concerned. I found the machine after being stored over night would not be square in the y axis. one side would always slip on me. I soon learned that if I left the machine overnight in the complete end of the Y axis this problem was cured, so I started leaving it is that position overnight. It seems that the x axis gantry, z axis gantry, and the router all weigh more than what the y axis gantries can support when the machine is tilted for extended periods of time. So, if you use my table built that I posted on the website please remember to always store your machine at the bottom end of your tilted bed overnight.
The Fact that it took Ninety days to get my new machine turned out to be a blessing in disguise. I wisely spent my time reading the manual, going on “You Tube” and watching many, many online tutorials on how to use the machine. I would Like to thank Mark Lindsay, and Garrett Fromme for their invaluable lessons they posted on “You Tube”. I would also like to thank the people of Seinci Labs for their patience with all my questions.
In conclusion, being a new CNC user and using Vectric Vcarve pro with the gsender program developed by Seinci Labs has proven to be the right choice for my needs. I will definitely recommend the Longmill MK2 to anyone who asks me, with the qualifier that I have no other experience with any other machines.
Mahalo, William Scrote
Maui, Hawai’i
David Ursino (verified owner) –
Waiting 3 1/2 months was well worth the wait. Solid machine. Runs perfectly. Customer service is excellent too.
Per Steinar Kotani H. (verified owner) –
So far, everything works fine. Some fine-tuning, and it is flying! For the price, you can get no better.
Herbert Wallace (verified owner) –
I have 31 years of CNC background in the metal working environment. Extensive manual programming as well as computer assist. I will tell you this wood working CNC is a different animal in that the terminology is different as well as the types of cutters and even the models are different….
It took me a long time to set up the MK2 just because my shop is not heated and so I was not out in the shop much.. as far as tech support and missing part request that was needed, I was taken care of very quickly. I’m using Carbide Create with G-sender. I really liked the surfacing option inside G-sender. Worked great. That’s as far as I got so far but I’m working on putting a hole in the spoiler board to allow long boards to go down into it so that I can cut box joints on the end that sticks up into the work area.
Looking forward to proceeding.
Charles G. (verified owner) –
Very solid machine. An easy build with great instructions. I feel that I know each part of my MK2. Just surfaced my spoil board with the gsender program. It went very well.
Can’t wait to start making projects.
Kevin Lockhart (verified owner) –
Your company has been very helpful. You have provided speedy response to any questions I may have had. I recommend your product to anyone looking to purchase a long mill.