Re: Lost Steps (Me again)

All,
To add to the mystery:
I had told Tim that these motors were 150 in-oz motors, (much smaller
than his), but this morning I just recieved identification of the
motors from the Italian manufacturer, saying that they are 474 in-oz,
90 Volts, 4 Amps!

Tim's motor are 550's and he's running a 450mhz computer compared to
my 200 mhz.

Could my current be set too low? The Camtronics board is putting out
37 volts and set for 2.86 amps.

Regarding the acceleration;
I can try a lower number, but the problem occurs at low feeds, i.e.
below 7ipm!
Jerry





--- In CAD_CAM_EDM_DRO@egroups.com, "Matt Shaver" <mshaver@e...>
wrote:

> > From: Tim Goldstein <timg@k...>
> > 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?