Re: [CAD_CAM_EDM_DRO] Lost Steps (Me again)

> From: Tim Goldstein <timg@...>
> The system he is using was set up with freqmod. It is a Pentium classic

200.

> The period had to be set pretty high to get any reasonable responsiveness
> from the GUI. Following is the .ini file Jerry started with. Not sure of

any

> changes he made.

<...>

> ; Base task period, in seconds
> PERIOD = 0.000015

This works out (if my math is right) to a PERIOD of 18 ticks of the CH0 clock
on the 8254 CTC. Gack! I was running 11 or 12 on my last machine and that was
with a 350MHz Pentium2.

> [TASK]
> CYCLE_TIME = 0.010
> DEFAULT_VELOCITY = 0.1
> MAX_VELOCITY = 0.6
> DEFAULT_ACCELERATION = 6.0
> MAX_ACCELERATION = 6.0

WOW! 6.0! Even 3.0, as Jerry said he reduced it to in his follow-up post, is
pretty high. I'm freaking out because I can't find a copy of the .ini file I
used for the BOSS Bridgeport I did, so I can't tell exactly what I used. I
think it was about 1.0, but I'm going to try and find that file...

> [AXIS_0]
> MAX_VELOCITY = 0.3
> P = 1000.000

You might try lowering P to 200 or so.

> FF0 = 0.000

You could also try adding FF0 gain if you lower P. I wish I had that file...

> INPUT_SCALE = 8000 0
> OUTPUT_SCALE = 8000 0.000

Oh boy :( My machine had a scale of 4000 and I couldn't get a velocity
greater than 0.9 reliably.

> MIN_OUTPUT = -10
> MAX_OUTPUT = 10

I also think I let the [TRAJ]MAX_VELOCITY stay at .9 and limited the axes
with MIN & MAX_OUTPUT, but that might not be necessary with the per axis
MAX_VELOCITY settings (that must be new...).

I hadn't been following this thread closely, so I went back and read a bunch
of the posts. If this machine is a Shoptask just like Tim's, I wonder what
the difference is? Motors? PC? He's using the same Camtronics board as Tim.

Does Jerry live anywhere near Maryland? Probably not... How about Colorado?

This may be a problem soluble only with a faster PC, or an external step
pulse generator (I hope to have this in the not too distant future). Either
that or you'll have to stay with one of the other software packages that
freezes the GUI during moves to gain better control of the step pulse output
frequency stability.

Matt

P.S. I'll look for that file tomorrow, but I don't see why Tim's file
wouldn't work. Are you guys running the same OS and EMC versions?