Spindle encoder

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01 Aug 2018 09:20 #115292 by russkinch
Spindle encoder was created by russkinch
Good morning,
I have built a cnc lathe and its working great, apart from the spindle encoder which seems very slow. I am using an optocoupler off ebay and I think it cant read fast enough, so threading is a maximum on 300rpm. Can some show me how to built an encoder from scratch and whats they used. Would like to thread at 550rpm so its cutting the material as opposed to tearing it.
Many thanks
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01 Aug 2018 09:47 #115294 by tecno
Replied by tecno on topic Spindle encoder
Isn't it better to bite the bullet and buy a proper encoder with A/B/Z channels?
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01 Aug 2018 10:09 #115295 by Mike_Eitel
Replied by Mike_Eitel on topic Spindle encoder
Chipo try:
Try to reduce the current oft the sending diode.
Less saturation can speedup recovery timing....
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01 Aug 2018 13:31 #115303 by russkinch
Replied by russkinch on topic Spindle encoder
Hi tecno,
I would love to but as I am a mechanical engineer and have a very very limited electrical knowledge would you mind pointing me in the right direction?
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01 Aug 2018 13:43 #115304 by tecno
Replied by tecno on topic Spindle encoder
Do a Google search and you will have many sources, these are quality encoders.

omron rotary encoder A/B/Z TTL
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03 Aug 2018 10:33 #115497 by andypugh
Replied by andypugh on topic Spindle encoder

russkinch wrote: Good morning,
I have built a cnc lathe and its working great, apart from the spindle encoder which seems very slow. I am using an optocoupler off ebay and I think it cant read fast enough, so threading is a maximum on 300rpm.


Are you sure it is the optocoupler?

What is your base thread rate (from the INI). (This question only makes sense if you are using the parallel port)
What is the PPR of your encoder?
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12 Aug 2018 23:15 #115983 by russkinch
Replied by russkinch on topic Spindle encoder
Hi,
I have a home made encoder. So its 45ppr aluminium drilled plate on the spindle. The base thread rate was 45000 the last I checked but can confirm on Monday. The encoder is a Slot Type IR Optocoupler Speed Sensor Module LM393 from ebay. Its pluged into my BOB as an input. The pin on the BOB is 5v and when earthed reads as a signal.
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12 Aug 2018 23:56 #115985 by andypugh
Replied by andypugh on topic Spindle encoder
45ppr and 45000 base thread suggests that you should be OK up to 493 revs per second, or 30,000 rpm, so it looks like it isn't a count rate problem in HAL.

Just to check, does 300rpm look like 300 rpm?
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13 Aug 2018 22:28 #116018 by russkinch
Replied by russkinch on topic Spindle encoder
it seems a little fast but thought it was just an optical illusion. I have bought a digital tachometer to check actual spindle speed. I will let you know
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