Spindle indexing disc with opto switches

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15 Apr 2016 13:55 #73347 by midyo
I'm about to make an "encoder" from a disc and 2 of these opto switches RS 306-061. uk.rs-online.com/web/p/slotted-optical-s...rigin=PSF_438299|alt

I'm not too concerned with the single pulse index as already have this up and running and can be left as is I think?

Is the best number holes/slots 100? Comments on the choice of sensor most welcome as don't want to waste precious time!

Thanks

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15 Apr 2016 16:10 - 15 Apr 2016 16:11 #73349 by cncbasher
they are fine , for me i'd go with a disk of 120 slots ,
however , any number of slots from say 60 will do
i have used disks with 100 , without problem

( i say 120 for the reason that it's equally divisable into 360 degrees )
all depends on how much space you have available for the diameter of the disk
Last edit: 15 Apr 2016 16:11 by cncbasher.

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15 Apr 2016 16:35 #73350 by midyo
120 it is then - makes total sense. Aslong as I can get them in, obviously I could make the disc bigger if space allows?? Is there an ideal gap size between holes/slots, or maybe a minimum gap?

cheers

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17 Apr 2016 14:25 #73477 by andypugh

Is there an ideal gap size between holes/slots, or maybe a minimum gap?


Yes, but it depends on the sensor more than anything else.

Some sensors have two detectors and can do full quadrature. I would be tempted to use one of those even if you don't wire the B-channel at the moment.

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