Re: Digest Number 68

I have run stepper motors at over 400 RPM on a 486-33SX with maxnc.
Yes you can use the timeset program but that something that I never use.
I simply go into the PR program and edit the values for the jump start and
Maximum speeed.
The lower the number for Maximum speed the faster the motor will run in the
F ast jog mode or a G00 command from MDI
The jump start give the ramping curve. The larger the number the more
ramping you will have.
Just sit down and do it logically. get a piece of paper and write down the
current settings for jump start and max speed.
Change the max speed to a lower number and increase the jump start to a
higher number.
Then run max again and see the results. Vary the numbers depending on the
results. If the motor just busses then ytou have it set to fast. If it
starts to ramp up then phases out then the ramping time ie the jump start
number is to low.
Dan
-----Original Message-----
From: Andrew Werby <drewid@...>
To: CAD_CAM_EDM_DRO@onelist.com <CAD_CAM_EDM_DRO@onelist.com>
Date: Monday, June 28, 1999 11:02 AM
Subject: Re: [CAD_CAM_EDM_DRO] Digest Number 68

>From: Andrew Werby <drewid@...>
>
> "Ian W. Wright" <Ian@...>
>Subject: Re: Stepper controllers
>
>Hi Andrew,
>
>Sorry I have taken so long to get back to you but I have been away for a
>couple of weeks.
>I am not trying to do any more than persuade the steppers to run
>reliably. Using the Pentium I can get about 150 rpm out of the motors
>without losing steps but, using the 486, I can only get reliable
>stepping at about 50 rpm and then only on selected motors. The 486 I was
>using only had a 486/66SX chip in and so I wonder if the problem was due
>to the lack of a maths co-processor (as in the DX chip)? I was running
>the computer in Windows '95 DOS mode from the hard disk and using 16Mb
>of RAM.
>
>[I don't think this has much to do with floating-point math- as far as I
>know (and we're getting to the outer edge of what I do know about this) the
>task is simply to spit out precalculated numbers at the correct time. It
>does sound like your problem is related to processor speed, though.]
>
>I did use the Timeset program to set the initial parameters for MaxNC
>and fiddled with the corresponding settings in the Stepster program.
>Using the Pentium the motors just fly but I was hoping to be able to use
>the 486 so as not to tie up the Pentium which could be better employed
>elsewhere.
>
>Ian
>
>[Well, the MaxNC system works on a 486, but it doesn't go very fast. I
>wasn't aware that it would go much faster with a Pentium. Perhaps the raw
>speed of the motors isn't what's important, but the speed at which it can
>reliably count steps, and the faster processor is better at this. If you're
>using Stepster instead of MaxNC's software, you might have to run a
>time-setting program specific to that application.]
>
>Andrew
>
>Andrew Werby wrote:
>
>> [How fast are you trying to run your steppers? I've run MaxNC's software
>> successfully on one of their machines, using an antique 386, and it

worked

>> fine- no lost steps. Perhaps if you get into higher speed ranges you need

a

>> faster CPU. But there might be a problem coordinating the speed of the
>> motors with the speed of the computer. MaxNC has a program called

"Timeset"

>> that you need to run when initializing a machine- did you do this?]
>>
>> Andrew Werby
>
>Andrew Werby - United Artworks
>Sculpture, Jewelry, and Other Art Stuff
>http://unitedartworks.com
>
>
>
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