On Thu, 21 Sep 2023, gene heskett wrote:
Date: Thu, 21 Sep 2023 19:39:17 -0400
From: gene heskett <ghesk...@shentel.net>
Reply-To: "Enhanced Machine Controller (EMC)"
<emc-users@lists.sourceforge.net>
To: Emc-users@lists.sourceforge.net
Subject: [Emc-users] Q,
switching machine from inch default to metric (mm's) default?
Greetings said a confused guy;
If I want to keep the same physical speeds, basically what the machine can
do, it makes sense the STEP_SCALE in each axis gets divided by 25.4 to make
it a mm machine.
But when I've done that the machine moves extremely slow, and throws a
following error when it has moved by about the amount set in FERROR and/or
MIN_ERROR. What else besides the MAXVELS and ACCEL's need massaging, as it
makes sense they should be multiplied by 25.4. Which I did, but then it
tries to move at several hundred mm/sec & crashes into all the stops.
You need to set the stepgen max-vels and max-accels to reasonable
values also (typically 25% higher than the machine max-vels and
max-accels)
Another problem, what is the input resistance load of a 7i76D when its set
for 12 volt logic. I am using a prox switch for a home switch on this new A
axis. I get 12 volts back from the prox switch when triggered, and the prox
switch is rated for srcing 300 milliamps when triggered, but when I hook it
up to hm2_5i25.0.7i76.0.0.input-06, the switch does not heat, but only gives
a few millivolts over 8 volts, like there is one hell of a load, and its the
same for 2 different new prox switches and for 2 different inputs on the
7i76D. The new A axis homes like it should, only axis that actually works for
homing.
7I76Ds depending on vintage may have 22K, 20K or 10K input impedances
I could use some help. This is so frustrating that I'm ready to give up, copy
the 3 axis inch config over this one and add the A axis stuff all over again.
Also:
This new atpid was not, at least for me, anywhere near ready for prime time.
It gives huge, often unstable numbers for inch linear axis's, and left my
bs-1 servo hunting so bad it burned up a $120 motor in about 3 minutes
quietly hunting about half an arcminute, at around 10 hertz. It refuses to
find usable settings for an angular axis. 6+ digits left of the decimal point
for vars for that mode, yet when I asked, I'm told it should work with the
hard to find procedure, but it doesn't.
Thanks.
Cheers, Gene Heskett.
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.
- Louis D. Brandeis
Genes Web page <http://geneslinuxbox.net:6309/>
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Peter Wallace
Mesa Electronics
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