On 9/21/23 20:11, Peter Wallace wrote:
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)
More important, if the values for inch have been determined, what
multiplier do I apply to convert it to the same thing in mm? Using 25.4
as the multiplier is obviously very wrong.
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
Even 10k should not seriously effect a device that can src 300 milliamps
when its triggered. I should be seeing only a few % below the nominally
12.5 src. 11.75 volts minimum. Feeding a 10 meg dvm, its about 5mv below
the src 12.5. A 4 volt drop says there is a considerable current going
someplace. I'll put another k in series and measure across it tomorrow.
Thanks Peter.
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
_______________________________________________
Emc-users mailing list
Emc-users@lists.sourceforge.net
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.
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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