On Tue, 19 Jan 2021, Todd Zuercher wrote:
Date: Tue, 19 Jan 2021 20:50:49 +0000
From: Todd Zuercher <to...@pgrahamdunn.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] Spindle speed changes with threading.
I under stand the analogy, but I wonder if Linuxcnc is erroneously behaving as
if the "leadscrew" were multiple start, with the number of starts equal to the
encoder's counts/rev. Resulting in the syncing of the axis to the spindle is
inconsistent if the syncing move isn't always the same? (Not saying this is
how it is, just proposing a possible reason if the problem is real.)
I don't do any threading or have any machines with a spindle encoder. But I
have observed this debate on whether this problem exists in Linuxcnc for years
now here on this list.
Todd Zuercher
P. Graham Dunn Inc.
630 Henry Street
Dalton, Ohio 44618
Phone: (330)828-2105ext. 2031
I dont think, the z position is "geared" to the counts beyond
index so locked unambiguously to spindle angle beyond index,
after initial sync is acheived.
Peter Wallace
Mesa Electronics
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