# OpenSource LongMill Scratch Build **URL:** \ **Category:** 🧰 CNC Setup\ **Created:** [November 12, 2019, 3:23pm UTC](https://forum.sienci.com/t/opensource-longmill-scratch-build/191 "2019-11-12T15:23:19Z")\ **Posts on this page:** 20\ **Page:** 5
**Author:** ![Hansi](https://forum.sienci.com/user_avatar/forum.sienci.com/hansi/32/216_2.png) [@Hansi](https://forum.sienci.com/u/Hansi)\ **Post date:** [May 1, 2020, 5:43am UTC](https://forum.sienci.com/t/opensource-longmill-scratch-build/191/83 "2020-05-01T05:43:13Z")
Motors are pretty much the same. My controller is the DDCSv2. ![38](https://forum.sienci.com/uploads/default/original/1X/2a1544f1de82575dd110d32db8f8eb26d5910dee.jpeg) ---
**Author:** ![Hansi](https://forum.sienci.com/user_avatar/forum.sienci.com/hansi/32/216_2.png) [@Hansi](https://forum.sienci.com/u/Hansi)\ **Post date:** [May 1, 2020, 11:47am UTC](https://forum.sienci.com/t/opensource-longmill-scratch-build/191/84 "2020-05-01T11:47:24Z")
I added a simple Y-axis drag chain support. The drag chain that I ended up getting, has a 180° swivel end link, so the chain would just droop down, behind the support. It’s hard to figure out all those details when you order from AliExpress… But that’s part of scratch building. ![IMG_20200501_112612](https://forum.sienci.com/uploads/default/original/1X/946ebf64fc369556a5db8984235b40819ebcf532.jpeg) ![IMG_20200501_122547](https://forum.sienci.com/uploads/default/original/1X/80301e7652e399d458e036487d38ed7f375df308.jpeg) ![IMG_20200501_122627](https://forum.sienci.com/uploads/default/original/1X/81a6f058d71b7062f7df12837d507d30d448cda1.jpeg) ---
**Author:** ![Hansi](https://forum.sienci.com/user_avatar/forum.sienci.com/hansi/32/216_2.png) [@Hansi](https://forum.sienci.com/u/Hansi)\ **Post date:** [May 1, 2020, 11:48am UTC](https://forum.sienci.com/t/opensource-longmill-scratch-build/191/85 "2020-05-01T11:48:35Z")
I did shorten up this chain by 5 links, after I took the picture ---
**Author:** ![Hansi](https://forum.sienci.com/user_avatar/forum.sienci.com/hansi/32/216_2.png) [@Hansi](https://forum.sienci.com/u/Hansi)\ **Post date:** [May 1, 2020, 11:55am UTC](https://forum.sienci.com/t/opensource-longmill-scratch-build/191/86 "2020-05-01T11:55:47Z")
Waiting on more supplies… Aviation connectors, cables, ds37 components, 2GT pulleys, switches etc. from China. Stuff is coming. Just a little spread out. I may just test out my axis’s with this cute PWM signal generator board I got. Let’s see… ![20](https://forum.sienci.com/uploads/default/original/1X/49c541b777d50985601c1ac430dc2139cfaeb00b.jpeg) ---
**Author:** ![GertJan](https://forum.sienci.com/letter_avatar_proxy/v4/letter/g/76d3ee/32.png) [@GertJan](https://forum.sienci.com/u/GertJan)\ **Post date:** [May 1, 2020, 1:09pm UTC](https://forum.sienci.com/t/opensource-longmill-scratch-build/191/87 "2020-05-01T13:09:41Z")
@Hansi I bought the 30x30 model and I am now looking to get it smaller (Y-axis). I could cut the profile or get another one instead and use the old one if I have more space. I can only get 70x70x7 profiles and was wondering if you shared your reworked brackets somewhere. ---
**Author:** ![Hansi](https://forum.sienci.com/user_avatar/forum.sienci.com/hansi/32/216_2.png) [@Hansi](https://forum.sienci.com/u/Hansi)\ **Post date:** [May 1, 2020, 4:36pm UTC](https://forum.sienci.com/t/opensource-longmill-scratch-build/191/88 "2020-05-01T16:36:13Z")
Hi Gert: I would gladly share… Just need to figure out how to do it 😊. What’s the best way and best format? I did all the mods on Fusion, so there would be all kinds of export options. Or just the STL’s? Don’t forget the V-wheel spacing on the main gantry changes, because of the larger aluminum angle. Hansi ---
**Author:** ![Hansi](https://forum.sienci.com/user_avatar/forum.sienci.com/hansi/32/216_2.png) [@Hansi](https://forum.sienci.com/u/Hansi)\ **Post date:** [May 1, 2020, 4:44pm UTC](https://forum.sienci.com/t/opensource-longmill-scratch-build/191/89 "2020-05-01T16:44:14Z")
Gert: I would change one thing… Move the vertical screw down hole, in the middle leg supports, 5 mm outwards. The angle iron was a little in the way of getting the screw down. ![IMG_20200501_194350](https://forum.sienci.com/uploads/default/original/1X/7053732fe7ea4db2edd3566ab241f696ac2a5ff5.jpeg) ---
**Author:** ![Hansi](https://forum.sienci.com/user_avatar/forum.sienci.com/hansi/32/216_2.png) [@Hansi](https://forum.sienci.com/u/Hansi)\ **Post date:** [May 1, 2020, 6:03pm UTC](https://forum.sienci.com/t/opensource-longmill-scratch-build/191/90 "2020-05-01T18:03:06Z")
@ALL: I’m trying to compare the cutter deflection of my build, to that of the original LM with Makita. Maybe someone has established some values of the different variables: -Distance from center of X-axis to force exertion point -amount of force applied -distance from X-axis lead screw to indicator -etc. Hopefully I’m understandable. Hansi ---
**Author:** ![Hansi](https://forum.sienci.com/user_avatar/forum.sienci.com/hansi/32/216_2.png) [@Hansi](https://forum.sienci.com/u/Hansi)\ **Post date:** [May 1, 2020, 6:25pm UTC](https://forum.sienci.com/t/opensource-longmill-scratch-build/191/91 "2020-05-01T18:25:26Z")
Video to show kinda what I’m referring to [https://youtu.be/ij8lbQlMJF0](https://youtu.be/ij8lbQlMJF0) ---
**Author:** ![chrismakesstuff](https://forum.sienci.com/user_avatar/forum.sienci.com/chrismakesstuff/32/10759_2.png) [@chrismakesstuff](https://forum.sienci.com/u/chrismakesstuff)\ **Post date:** [May 1, 2020, 10:57pm UTC](https://forum.sienci.com/t/opensource-longmill-scratch-build/191/92 "2020-05-01T22:57:48Z")
Hansi, I can offer up this video I made late last year. Let me know if that provides the information you need: ---
**Author:** ![Hansi](https://forum.sienci.com/user_avatar/forum.sienci.com/hansi/32/216_2.png) [@Hansi](https://forum.sienci.com/u/Hansi)\ **Post date:** [May 2, 2020, 1:20pm UTC](https://forum.sienci.com/t/opensource-longmill-scratch-build/191/93 "2020-05-02T13:20:51Z")
Yes, exactly! Thanks Chris. I remembered now that I had watched that back in the beginning while I was researching…😫 I guess I’m getting older. ---
**Author:** ![Hansi](https://forum.sienci.com/user_avatar/forum.sienci.com/hansi/32/216_2.png) [@Hansi](https://forum.sienci.com/u/Hansi)\ **Post date:** [May 3, 2020, 1:19pm UTC](https://forum.sienci.com/t/opensource-longmill-scratch-build/191/94 "2020-05-03T13:19:14Z")
The following are STL’s for the components I printed, in order to use **70mmx70mmx7mm** ALUMINUM ANGLE [Drag Chain Support](https://drive.google.com/open?id=1fxdR7ehvMhCJAnsjk1UpFS-CW8YzYbz0) [Middle Rail Support](https://drive.google.com/open?id=1ptCc1czugz1BiZr4u8ciJNvkt0_wzK1E) [Nema 23 Mount Front Left](https://drive.google.com/open?id=1ZtTTxU1jIMHWOiGeQ7o7jNItwkmPGBaO) [Nema 23 Mount Front Right](https://drive.google.com/open?id=1Hwy7cIVzEYJXIRfIpe6sztjdIkVZNQwg) [Nema 23 Mount Rear Left](https://drive.google.com/open?id=1LhZvJQBuBDVpYmbOdMVCFv63zIlf9HT7) [Nema 23 Mount Rear Right](https://drive.google.com/open?id=1ChoiWuYCYZYcKrLpH2Bu-RyZe2NKSCFi) [Shoulder Bracket](https://drive.google.com/open?id=1ww-mLmBPwdj9jA5r1pFeBJ_TJk89KWx1) [X-Axis Drag Chain Holder](https://drive.google.com/open?id=1ys813RWbs7Rt8Dym2rEA70m2oH5Dd5R0) [Y-Axis Gantry Spacer](https://drive.google.com/open?id=1xMbm3xmYRpj7UhvTM8v9fotwV-U7HlfP) [Z-Axis Top](https://drive.google.com/open?id=1QiD-vZtFMgd-4lOWGm-19XBlvcDxT3Vv) ---
**Author:** ![Hansi](https://forum.sienci.com/user_avatar/forum.sienci.com/hansi/32/216_2.png) [@Hansi](https://forum.sienci.com/u/Hansi)\ **Post date:** [May 3, 2020, 1:24pm UTC](https://forum.sienci.com/t/opensource-longmill-scratch-build/191/95 "2020-05-03T13:24:40Z")
Hi Gert: Please check out the above links, and let me know if they work. I printed all the parts laying flat on their backs. You will have to re-orientate them when you bring them into your slicer. Don’t forget to modify your steel Y-axis gantry plates, so that they will handle the larger opening (hypotenuse) of the aluminum angle. ---
**Author:** ![GertJan](https://forum.sienci.com/letter_avatar_proxy/v4/letter/g/76d3ee/32.png) [@GertJan](https://forum.sienci.com/u/GertJan)\ **Post date:** [May 4, 2020, 4:16pm UTC](https://forum.sienci.com/t/opensource-longmill-scratch-build/191/96 "2020-05-04T16:16:36Z")
Thanks for the files, I was able to download them. Looking into it and 70x70 might be a lot more work since the gantry also needs adjustment. ---
**Author:** ![Hansi](https://forum.sienci.com/user_avatar/forum.sienci.com/hansi/32/216_2.png) [@Hansi](https://forum.sienci.com/u/Hansi)\ **Post date:** [May 4, 2020, 6:56pm UTC](https://forum.sienci.com/t/opensource-longmill-scratch-build/191/97 "2020-05-04T18:56:42Z")
Yes, that’s right. Maybe you can order the right stock? Be very careful if you mill any stock down to size… There’s surface tension holding those profiles straight, and will need to be milled off equally in every dimension. Best of success, Hansi ---
**Author:** ![Hansi](https://forum.sienci.com/user_avatar/forum.sienci.com/hansi/32/216_2.png) [@Hansi](https://forum.sienci.com/u/Hansi)\ **Post date:** [May 8, 2020, 9:49am UTC](https://forum.sienci.com/t/opensource-longmill-scratch-build/191/98 "2020-05-08T09:49:36Z")
![IMG_20200508_124131](https://forum.sienci.com/uploads/default/original/1X/f6a9315b96b894102d6b5eaf5bac77f522564ba4.jpeg) The wiring harness that these motors come with are pretty fine…like 24-26 AWG compared to my 20 AWG that I’m trying to use. Other people even use 18AWG ---
**Author:** ![Hansi](https://forum.sienci.com/user_avatar/forum.sienci.com/hansi/32/216_2.png) [@Hansi](https://forum.sienci.com/u/Hansi)\ **Post date:** [May 8, 2020, 4:01pm UTC](https://forum.sienci.com/t/opensource-longmill-scratch-build/191/99 "2020-05-08T16:01:27Z")
![IMG_20200506_110529](https://forum.sienci.com/uploads/default/original/1X/261e585b45e2ad97b97122406062c3712e3abaa5.jpeg) Changing out the stock connection to an aviation plug. ---
**Author:** ![Hansi](https://forum.sienci.com/user_avatar/forum.sienci.com/hansi/32/216_2.png) [@Hansi](https://forum.sienci.com/u/Hansi)\ **Post date:** [May 8, 2020, 4:03pm UTC](https://forum.sienci.com/t/opensource-longmill-scratch-build/191/100 "2020-05-08T16:03:11Z")
![IMG_20200506_160455](https://forum.sienci.com/uploads/default/original/1X/3642a2b1d0a918ff391449f5bf6d8cfae55824e9.jpeg) ---
**Author:** ![Hansi](https://forum.sienci.com/user_avatar/forum.sienci.com/hansi/32/216_2.png) [@Hansi](https://forum.sienci.com/u/Hansi)\ **Post date:** [May 8, 2020, 4:06pm UTC](https://forum.sienci.com/t/opensource-longmill-scratch-build/191/101 "2020-05-08T16:06:41Z")
![IMG_20200506_160534](https://forum.sienci.com/uploads/default/original/1X/ddae13c9313989203d941c8b587c1d539d60e004.jpeg) Take out the stock wire mount and use one of its mounting holes to attach a ground wire. Some people trust that the mechanical connection from the motor to the CNC chassis, is good enough, but in our case we have all kinds of plastic parts in between. ---
**Author:** ![Hansi](https://forum.sienci.com/user_avatar/forum.sienci.com/hansi/32/216_2.png) [@Hansi](https://forum.sienci.com/u/Hansi)\ **Post date:** [May 8, 2020, 4:08pm UTC](https://forum.sienci.com/t/opensource-longmill-scratch-build/191/102 "2020-05-08T16:08:12Z")
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