# OpenSource LongMill Scratch Build **URL:** \ **Category:** šŸ§° 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:** 3
**Author:** ![andy](https://forum.sienci.com/letter_avatar_proxy/v4/letter/a/aeb1de/32.png) [@andy](https://forum.sienci.com/u/andy)\ **Post date:** [February 18, 2020, 9:08pm UTC](https://forum.sienci.com/t/opensource-longmill-scratch-build/191/43 "2020-02-18T21:08:00Z")
I should mention that the BOM is now available here: [https://sienci.com/dmx-longmill/open-source-and-modifications/](https://sienci.com/dmx-longmill/open-source-and-modifications/) ---
**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:** [February 19, 2020, 7:51pm UTC](https://forum.sienci.com/t/opensource-longmill-scratch-build/191/44 "2020-02-19T19:51:23Z")
thanks for that BOM. ---
**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:** [March 6, 2020, 4:22pm UTC](https://forum.sienci.com/t/opensource-longmill-scratch-build/191/45 "2020-03-06T16:22:16Z")
![54](https://forum.sienci.com/uploads/default/original/1X/ea3581625d15f76c4d090f469a7854c3530e1a90.jpeg) Bit by bit šŸ˜Š ---
**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:** [March 6, 2020, 4:28pm UTC](https://forum.sienci.com/t/opensource-longmill-scratch-build/191/46 "2020-03-06T16:28:34Z")
It took 17 WEEKS for my V-BOTTOM wheels to finally arrive from AliExpress šŸ˜« Good thing I was busy making other parts in the meantime. So ya, you have to be prepared to run into those kinds of troubles when scratch building. BTW, not at all disappointed with the quality of the v-wheelsā€¦ They look really good. ---
**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:** [March 6, 2020, 4:35pm UTC](https://forum.sienci.com/t/opensource-longmill-scratch-build/191/47 "2020-03-06T16:35:11Z")
![IMG_20200306_183204](https://forum.sienci.com/uploads/default/original/1X/9d9c74251135b549b52539a57561c6b784bedc05.jpeg) Ecentric nuts I had to makeā€¦ Canā€™t buy this kind with the nice long cylindrical boss, over seas. ---
**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:** [March 6, 2020, 5:34pm UTC](https://forum.sienci.com/t/opensource-longmill-scratch-build/191/48 "2020-03-06T17:34:06Z")
![44](https://forum.sienci.com/uploads/default/original/1X/49d5d57c0c84da32b6d3b5f4836142a760a7478c.jpeg) Another test fit ---
**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:** [March 7, 2020, 6:22pm UTC](https://forum.sienci.com/t/opensource-longmill-scratch-build/191/49 "2020-03-07T18:22:40Z")
![IMG_20200307_181558](https://forum.sienci.com/uploads/default/original/1X/accc5c72a03effeb0bff97f8e9023abe8d86d452.jpeg) Tip: Before inserting lead screws, run a bearing free handed, over the length and remove any slight hang ups with an oil stone. ---
**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:** [March 10, 2020, 1:39pm UTC](https://forum.sienci.com/t/opensource-longmill-scratch-build/191/50 "2020-03-10T13:39:45Z")
![IMG_20200309_180413](https://forum.sienci.com/uploads/default/original/1X/50e9d1eb2c4e2326367f03a7ea9dd681a90567f7.jpeg) Thinking about clamping each Y axis against an angle plate, and skimming off the feet, in order to true them to each other. Any thoughts? ---
**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:** [March 13, 2020, 8:00am UTC](https://forum.sienci.com/t/opensource-longmill-scratch-build/191/51 "2020-03-13T08:00:36Z")
![firefox](https://forum.sienci.com/uploads/default/original/1X/22fd25a381618236cda3596c34ff8d73f391d174.jpeg) I didnā€™t care for this type of locking ring, so I turned some up, using the idea from the couplings ---
**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:** [March 13, 2020, 8:02am UTC](https://forum.sienci.com/t/opensource-longmill-scratch-build/191/52 "2020-03-13T08:02:15Z")
![IMG_20200312_204533](https://forum.sienci.com/uploads/default/original/1X/e8c34e1db4415f129dcb2814e744d3e48ea36a19.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:** [March 13, 2020, 8:03am UTC](https://forum.sienci.com/t/opensource-longmill-scratch-build/191/53 "2020-03-13T08:03:08Z")
The little step faces the bearing, so it only contacts the inner race ---
**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:** [March 13, 2020, 8:03am UTC](https://forum.sienci.com/t/opensource-longmill-scratch-build/191/54 "2020-03-13T08:03:43Z")
![IMG_20200312_204628](https://forum.sienci.com/uploads/default/original/1X/b71caed3912ccfeddd28e13a964b3fa6f4cf47bf.jpeg) ---
**Author:** ![CRD](https://forum.sienci.com/letter_avatar_proxy/v4/letter/c/b9bd4f/32.png) [@CRD](https://forum.sienci.com/u/CRD)\ **Post date:** [March 16, 2020, 12:16am UTC](https://forum.sienci.com/t/opensource-longmill-scratch-build/191/55 "2020-03-16T00:16:12Z")
Hansi, nice work! I especially like the ACME screw collar. ---
**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:** [March 16, 2020, 11:31am UTC](https://forum.sienci.com/t/opensource-longmill-scratch-build/191/56 "2020-03-16T11:31:30Z")
Thanks CRD. Ya, didnā€™t want to bugger up the thread since Iā€™ll be taking everything apart once itā€™s all proven. I want to send my steel parts out for E-coat later. Right now they are just rust proofed, until Iā€™m happy with everything. Free E-coat service through family member šŸ˜ ---
**Author:** ![gwilki](https://forum.sienci.com/user_avatar/forum.sienci.com/gwilki/32/366_2.png) [@gwilki](https://forum.sienci.com/u/gwilki)\ **Post date:** [March 16, 2020, 1:47pm UTC](https://forum.sienci.com/t/opensource-longmill-scratch-build/191/57 "2020-03-16T13:47:29Z")
Hansi: I really like your locking ring. Does it screw onto the acme rod, or just slip over it? If the latter, it would work like the slip on coupler at the motor end, correct? Also, if it just slips on, how do you get it to tension the rod? In another thread, it is advised to tension the Y axis rods to keep them from whipping. That is why I am asking. thank you ---
**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:** [March 20, 2020, 10:25am UTC](https://forum.sienci.com/t/opensource-longmill-scratch-build/191/58 "2020-03-20T10:25:48Z")
Hi Gwilki: Thanks for your comment. The locking ring is a split ring, like the shaft couplings and will not mar the lead screw. I currently have the lead screws tensioned by pulling on them by hand as I tighten the locking ringā€¦ But you do have a very good point. I donā€™t feel any longitudinal play right now, but if I need to apply more tension once in running, I think Iā€™ll tap an M4 into the end of the ACME screw and use a proper washer under the screw head, as it would pull against the locking ring from the back. Sorry, donā€™t have any drawing, but I hope you can figure out what I am referring to. ---
**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:** [March 20, 2020, 10:31am UTC](https://forum.sienci.com/t/opensource-longmill-scratch-build/191/59 "2020-03-20T10:31:20Z")
![IMG_20200320_122946](https://forum.sienci.com/uploads/default/original/1X/e1e75aa97514154356f0f933b75ec7c1e3f4ec6a.jpeg) Insert M4 cap screw with washer for lead screw tensioning, then tighten locking ring. ---
**Author:** ![gwilki](https://forum.sienci.com/user_avatar/forum.sienci.com/gwilki/32/366_2.png) [@gwilki](https://forum.sienci.com/u/gwilki)\ **Post date:** [March 20, 2020, 11:31am UTC](https://forum.sienci.com/t/opensource-longmill-scratch-build/191/60 "2020-03-20T11:31:51Z")
That makes perfect sense, Hansi. I was thinking that, if the locking ring was a bit shorter, you could use a nut on the end of the rod to tension it, tighten the locking ring, then remove the temporary nut. Thank you for replying. ---
**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:** [March 20, 2020, 8:05pm UTC](https://forum.sienci.com/t/opensource-longmill-scratch-build/191/61 "2020-03-20T20:05:06Z")
Yes, that would work too. My lead screws are only 100cm long where as the originals are 101cm if I remember right. That would have given me the needed length. A narrower collar would have forced me to use an M3 for lockingā€¦eh, not much thread holding on M3 in aluminum. Brass would be better for going small. ---
**Author:** ![frankchannel](https://forum.sienci.com/user_avatar/forum.sienci.com/frankchannel/32/364_2.png) [@frankchannel](https://forum.sienci.com/u/frankchannel)\ **Post date:** [April 3, 2020, 8:53pm UTC](https://forum.sienci.com/t/opensource-longmill-scratch-build/191/62 "2020-04-03T20:53:13Z")
How does one make one of these? [Previous page](https://forum.sienci.com/t/opensource-longmill-scratch-build/191.md?page=2) [Next page](https://forum.sienci.com/t/opensource-longmill-scratch-build/191.md?page=4)