Re: serious problem

[Ray Henry <rehenry-at-up.net>]

Hello Hassan.

Good to hear that you are running the comparisons.  I've got a couple of 
questions.  I see MicroKinetics as the machine definition.  What type of 
stepper motor amp are you using?  Are these full stepping?

I also see 20 ipm as rapid.  What feedrate are you running the ballbar 
program with?  Do the motors exhibit the missed steps at different 
feedrates?  I believe that Matt Shaver was getting 12-15 ipm as a 
comfortable rapid feedrate with the NIST Sherline with a MicroKinetics 
drive amp at NAMES.

So many questions, so little time.  If you are full or half stepping, I 
would suggest that you switch to freqmod if your PC is up to it.  You 
will need to do a bit of tuning on the PID variables (P = 400 to start) 
but it should provide a better pulsetrain for full or half step drive 
amps.

Hope this helps.

Ray


On Thursday 03 October 2002 09:41 pm, you wrote:
> Hello all,
> am still stuck, in the point where I should examine the controller
> (EMC) with the ball bar.
> ok........my problem is, I can't get the pulses to be smooth!
> when I am doing a circle ....at some points...the motors just
> stalls....no movement just vibrating
> and the points that am talking about are changing ..I mean the motors
> does not stall in the same position each time..
> I thought the problem is in the controller, but the same controller
> runs fine with other software's.
> my guess was that the acceleration or the deceleration values was big,
> so I changed them to smaller values, but this did not solve the
> problem. so I attached the ini file, hoping that somebody might help
> me!
>
> all suggestions are appreciated
>
> Regards
> Hassan