On Thu, 19 Mar 2020, Gene Heskett wrote:
Date: Thu, 19 Mar 2020 17:02:59 -0400
From: Gene Heskett <[email protected]>
Reply-To: "Enhanced Machine Controller (EMC)"
<[email protected]>
To: [email protected]
Subject: [Emc-users] A hal question?
Greetings; I am trying to reduce the f/r error in an ATS667 based
encoder.
The index pulse is turned upside down by a reversal of spindel
direction. Tts the nature of the beast to remain in this stable state
until the approach of the triggering ferrous metal causes the first
reversal which the edge ignores, and then goes back true or false as the
ferrous piece crosses the center.
So I break into the index signal path with a comp looking at the velocity
to generate an nearly instant direction signal and use it to diddle an
xor which will restore the upside down index signal to same side up,
this is then fed to an edge detector which fires on the positive going
edge, giving a consistent to the degree reset back to the encoder
regardless of spindle direction.
Does anyone see any problems with that? The reversal of the pulse at the
spindle reverse point should become the out of time and possible way
early pulse that sets it up to actually trigger as the piece crosses the
center of the ATS667. According to my thinking anyway.
Poke it full of holes if I'm wrong.
No index patching is needed as the index is only looked at when going in
one direction
Cheers, Gene Heskett
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Mesa Electronics
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