Feature Requests item #3067217, was opened at 2010-09-15 19:42
Message generated for change (Comment added) made by cradek
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: https://www.google.com/accounts ()
Assigned to: Nobody/Anonymous (nobody)
Summary: touchoff uses commanded position rather than actual position

Initial Comment:
Noticed this issue through an unusual sequence of events.

We are midway through a lathe conversion, in the mean time we are using EMC 
with linear scales as a glorified DRO.
However we noticed that when doing a touch off (to zero the display) it was 
always going to a fixed offset.
It turns out that the offset is the commanded position.

Basically when you press touch off, it is setting the co-ordinate system based 
on the commanded position rather than the actual position, given a servo system 
may well have some ferror at the time the end user is touching off it seems it 
would be more accurate to use the actual position than the commanded position 
for this process.



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>Comment By: Chris Radek (cradek)
Date: 2010-09-15 21:56

Message:
There was lots of discussion about this on #emc today, see
http://www.linuxcnc.org/irc/irc.freenode.net:6667/emc/2010-09-16.txt
starting at 2010-09-16 00:39:58.  

It is surely working as designed so it is not a bug; I'm changing this
report to be a feature request.

I don't think there's a consensus yet about whether this change is a good
idea or exactly how it would work.  I personally think it's probably a bad
idea but I'm not sure enough to close it.

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https://sourceforge.net/tracker/?func=detail&atid=356744&aid=3067217&group_id=6744

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