Opto spindle Encoder 2 or 3?
05 Apr 2018 17:25 #108458
by tecno
Replied by tecno on topic Opto spindle Encoder 2 or 3?
The test rig was never used on my lathe only play on lab bench, biggest problem was that laser cut was eccentric and did not perform well. To make this mechanically correct will work but there will be som tweaking to get all in right place.
I mounted encoder directly on my motor shaft as I have 1:1 belt drive (not optimal) but I have no place to mount encoder on spindle shaft.
I mounted encoder directly on my motor shaft as I have 1:1 belt drive (not optimal) but I have no place to mount encoder on spindle shaft.
The following user(s) said Thank You: Nemo1966
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06 Apr 2018 12:55 #108499
by andypugh
Replied by andypugh on topic Opto spindle Encoder 2 or 3?
The A and B sensors can be anywhere, but they need to be N+1/4 or N-1/4 apart.
Ideally the B transition happens half way between each A transition. It is this phasing that gives the direction as well as position information.
You can check the phasing with Halscope, the built-in oscilloscope in LinuxCNC. Just make your mounting adustable in some way.
tecno: That looks like a 3D printed sensor mount, so why didn't you make it curved so that the sensors all sit at the same radius?
Ideally the B transition happens half way between each A transition. It is this phasing that gives the direction as well as position information.
You can check the phasing with Halscope, the built-in oscilloscope in LinuxCNC. Just make your mounting adustable in some way.
tecno: That looks like a 3D printed sensor mount, so why didn't you make it curved so that the sensors all sit at the same radius?
The following user(s) said Thank You: Nemo1966
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06 Apr 2018 12:58 #108500
by tecno
Replied by tecno on topic Opto spindle Encoder 2 or 3?
First iteration to play with.
The following user(s) said Thank You: Nemo1966
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06 Apr 2018 13:32 #108508
by Nemo1966
Aha!!! Brilliant!
Thanks Andy and thank you tecno for taking the time to share your experience.
regards
Steve
Replied by Nemo1966 on topic Opto spindle Encoder 2 or 3?
You can check the phasing with Halscope, the built-in oscilloscope in LinuxCNC. Just make your mounting adustable in some way.
Aha!!! Brilliant!
Thanks Andy and thank you tecno for taking the time to share your experience.
regards
Steve
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