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Messages - kc5qoc

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11
General Mach Discussion / encoder interface specifics
« on: June 16, 2006, 04:34:09 PM »
Hi all

I am new to this encoder business - I have run steppers without them for years with no problems.

I am considering the following:

An encoder (a 300 cpr model from US Digital  - 1250 ppr ) on my X and Y motors that requires 400 steps per inch
When an EStop signal is sent my control sets the motors to free wheel - no voltage is applied to the motors at all
I use this free wheeling state to reposition the machine (It is a sewing machine - not a mill - its is in the garage)

Now the "I hope to" section:
I cause an EStop
I move to a position and zero out the system and it hopefully zeros the encoder DRO
When I get to the new position I would like to see the DxDy coordinates in the encoder DRO

My question is:
Because the EStop condition existed before the attempt to zero and then the move of the machine, will the encoder DROs still function properly or will they be blocked due to the EStop condition ?

any thought on this matter would be greatly appreciated

12
General Mach Discussion / Re: Opto-Isolated parallel card
« on: May 15, 2006, 05:14:30 PM »
Thanks - It look great - maybe good and cheap are not mutually exclusive after all.

13
General Mach Discussion / Opto-Isolated parallel card
« on: May 15, 2006, 02:16:43 PM »
I am new to this forum but I need you help in locating a good cheap (mutually exclusive ?) optically isolated parallel card.

Does anyone have any good suggestions ?

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