On Sun, 4 Apr 2021, Feral Engineer wrote:
Date: Sun, 4 Apr 2021 12:05:45 -0400
From: Feral Engineer <theferalengin...@gmail.com>
Reply-To: "Enhanced Machine Controller (EMC)"
<emc-users@lists.sourceforge.net>
To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net>
Subject: Re: [Emc-users] [Emc-developers] Home_use_index issue revisited
I'll do some repeatability testing on Tuesday. Between Easter family
visits, work and band practice tomorrow night, I won't have a chance to get
back on the machine until then.
When I had the and2 gate connecting both switches last night as my last
ditch effort, it repeated perfectly over a dozen times.
Right and as Sam said, adding index to this really doesnt add anything but
complexity if you can detect the index at linuxCNCs servo thread rate.
Where index can improve homing accuracy is when you have high resolution
encoders (and you clear on index) so the actual high resolution count is
captured in hardware without any servo thread sampling uncertainty
LinuxCNC master and Hostmot2 do support stepgen index with the right firmware
but this requires a high speed index input since the index input is a fully
hardware signal that captures the stepgen position.
Happy international carrot day, everybody! (Yes, it's really a thing)
Phil T.
The Feral Engineer
Check out my LinuxCNC tutorials, machine builds and other antics at
www.youtube.com/c/theferalengineer
On Sun, Apr 4, 2021, 11:59 AM Peter C. Wallace <p...@mesanet.com> wrote:
On Sun, 4 Apr 2021, Dewey Garrett wrote:
Date: Sun, 4 Apr 2021 15:36:30 -0000 (UTC)
From: Dewey Garrett <dgarr...@panix.com>
Reply-To: "Enhanced Machine Controller (EMC)"
<emc-users@lists.sourceforge.net>
To: emc-users@lists.sourceforge.net
Subject: Re: [Emc-users] [Emc-developers] Home_use_index issue revisited
The git *master* branch has an ini setting that may be relevant
for this use case:
http://linuxcnc.org/docs/master/html/config/ini-config.html
"HOME_INDEX_NO_ENCODER_RESET = NO - Use YES if the encoder
used for this joint does not reset its counter when an
index pulse is detected after assertion of the joint
index_enable hal pin. Applicable only for HOME_USE_INDEX = YES."
Refs:
https://github.com/LinuxCNC/linuxcnc/commit/5ea573adde
Also see forum thread starting here:
https://forum.linuxcnc.org/10-advanced-configuration/31813-tcp-5-axis-kinematics?start=120#139881
--
Dewey Garrett
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Thats interesting. I guess that allows index detection if the pulse is too
short
but may be off a few counts...
Peter Wallace
Mesa Electronics
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Peter Wallace
Mesa Electronics
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