rigid tapping fail advice and "discriminant" err

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31 Jul 2015 05:11 - 31 Jul 2015 05:39 #61057 by tome

This maybe?

www.usdigital.com/products/encoders/incr...tary/disks/HUBDISK-2

sam


Yeah, I was looking at those. By the way, how can that wheel do quadrature? I thought there had to be two sets of holes that were spaced 90 degrees out of phase? Or, can you have another optical emitter that is on a non-hole while the first emitter is on a hole?
-Tom

ps: I see that this unit (below) works with that disk to provide quadrature, so obviously one optical emitter/pickup inside the EM1 module is 90 degrees out of phase of the other. How does one do that on a home made one, that is, if I add another optical pickup to my existing wheel how to I ensure they two are 90 degrees out of phase?
www.usdigital.com/products/encoders/incr...ules/EM1#description
Last edit: 31 Jul 2015 05:39 by tome.

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31 Jul 2015 08:59 #61059 by drogge
Tom, You would need 5 wires; power, ground, A, B and Index.

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31 Jul 2015 09:05 #61060 by drogge

This maybe?

www.usdigital.com/products/encoders/incr...tary/disks/HUBDISK-2

sam

ps: I see that this unit (below) works with that disk to provide quadrature, so obviously one optical emitter/pickup inside the EM1 module is 90 degrees out of phase of the other. How does one do that on a home made one, that is, if I add another optical pickup to my existing wheel how to I ensure they two are 90 degrees out of phase?
www.usdigital.com/products/encoders/incr...ules/EM1#description


Unless you're good you have to make at least one of the pickups adjustable and then set the phase of the signals using a scope.

Drew

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31 Jul 2015 20:13 #61066 by andypugh
Just don't put the sensors 180 degrees out of phase. Or you will feel stupid.
Don't ask me how I know this.

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