Magnetic scales on new gantry mill
- jackdavies
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27 Apr 2025 13:18 - 27 Apr 2025 13:19 #327149
by jackdavies
Magnetic scales on new gantry mill was created by jackdavies
Hi all,
I am designing a new machine and would like to use Ditron magnetic scales on X & Y.
I am designing a new machine and would like to use Ditron magnetic scales on X & Y.
- The Y axis has dual motors, should I use a scale on each side or just one?
- Any recommendations of mesa boards to use here? 7i95T + 7i84U or 7i96 + 7i85
- Whats the process for setting this up in LCNC?
- I don’t believe these scales are differential signal, should I look for that?
Many thanks for your help!
Last edit: 27 Apr 2025 13:19 by jackdavies.
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- tommylight
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27 Apr 2025 14:09 #327161
by tommylight
2. For step/dir drives, 7i95T should be enough if you do not need a lot of IO. So a 7i84 would be required on both combos if you do need more IO.
3. a bit of editing will be needed either way, plenty of info and help here once you get to that point
4. differential are better for noise immunity, but Mesa works with both differential and single ended. They should be incremental TTL, as far as i know. Absolute type would require other boards/config/ depending on type of comms.
Replied by tommylight on topic Magnetic scales on new gantry mill
1. You should, the expense does not justify having missed steps on one side and ending up with a miss aligned gantryThe Y axis has dual motors, should I use a scale on each side or just one?
Any recommendations of mesa boards to use here? 7i95T + 7i84U or 7i96 + 7i85
Whats the process for setting this up in LCNC?
I don’t believe these scales are differential signal, should I look for that?
2. For step/dir drives, 7i95T should be enough if you do not need a lot of IO. So a 7i84 would be required on both combos if you do need more IO.
3. a bit of editing will be needed either way, plenty of info and help here once you get to that point
4. differential are better for noise immunity, but Mesa works with both differential and single ended. They should be incremental TTL, as far as i know. Absolute type would require other boards/config/ depending on type of comms.
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- Henk
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27 Apr 2025 14:59 #327166
by Henk
Replied by Henk on topic Magnetic scales on new gantry mill
I use Ditron magnetic scales all the time. Installed my first ones in 2019 on my 5 axis machine. Since the I have used installed about 20 of them. Not a single failure yet.
Be sure to specify that you want 1um resolution. Reader head model DMR2000. And also specify that you want the index pulse version (z signal) otherwise you get only A and B.
Yes. They are differential output
Henk
Be sure to specify that you want 1um resolution. Reader head model DMR2000. And also specify that you want the index pulse version (z signal) otherwise you get only A and B.
Yes. They are differential output
Henk
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- Hakan
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27 Apr 2025 21:56 #327195
by Hakan
Replied by Hakan on topic Magnetic scales on new gantry mill
What's the difference to linear scales with glass scales?
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