Re: [Emc-users] Steppermod vs Freqmod

[Mike J. <mi...@sh...>]

cd /usr/local/emc/plat/rtlinux_3_0/lib && wget
http://emc.obstinate.org/freqmod.o

This is for 2.18, dir structure might be different for other versions. At
sherline, with out motors we have found that the z-axis will skip a few
steps on an program with lots of quick up and down movement (we use a
program that mills a small heart pendant) if we run at our maximum
recommended feedrate of 22 inches / min. We have found that lowering the
feedrate will eliminate the problem with the z axis. Because it is fighting
gravity it needs to run much slower so that the motor can create more torque
to move the axis up and down in very small increments without skipped steps.

--
tbl



----- Original Message ----- 
From: "Dave Engvall" <den...@ch...>
To: <emc...@li...>
Sent: Thursday, July 31, 2003 7:28 AM
Subject: Re: [Emc-users] Steppermod vs Freqmod


> Tim,
> Check with Matt Shaver about a newer version of freqmod that fixes the
> problems.
>
> Dave
> ----- Original Message -----
> From: "Tim & Heather Smith" <thd...@bi...>
> To: <emc...@li...>
> Sent: Thursday, July 31, 2003 4:29 AM
> Subject: [Emc-users] Steppermod vs Freqmod
>
>
> > Guys, I was interested to read (in another recent thread), that there
may
> be
> > a problem with freqmod missing some steps when running contouring files
> with
> > many small incremental steps.
> >
> > I recently ran a program (a couple of times) that went for several hrs,
it
> > lost some steps( Z axis) both times, and I have been blaming my
> drivers/poor
> > grounding etc for these results.
> >
> > It was mentioned (Ray I think) that Steppermod did not have the same
> > problem.
> >
> > I would be interested to know what the conditions are that contribute to
> > these lost steps in freqmod. I have already upgraded the driver for the
Z
> > axis so I can't readily run Steppermod for a back to back comparison to
> see
> > if this was my problem.
> > I don't really want to use Steppermod as everytime I have tried it, the
> > motors are much harsher than with freqmod.
> >
> > I am running BDI 2.16 on a 330mhz 64Mb machine,with 2V 6A steppers at
80,
> > 80, & 33? steps per mm, in full step mode.
> >
> > Cheers Tim Smith
> >
> >
> >
> >
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