Messages

1

General Mach Discussion / Re: Motor problem

« on: December 12, 2008, 08:03:03 AM »

Thanks Julian. Now that I have the motors going I will be doing a lot of experimenting to find the best speed etc.

Denis.

2

General Mach Discussion / Re: Motor problem

« on: December 10, 2008, 08:21:42 PM »

You were spot on Hood, I had a friend "helping" me a few days ago, and he fiddled with a lot of the settings trying to get the motors to work. He knows less than I do about MACH 3, and I know precious little. I told him I didn't think what he was doing would make any difference. I thought I had reversed all that he had done, but obviously missed his fiddling on the outputs page. The motors were still not working when I fixed the outputs page, so I tried checking the active lows in the DIR and STEP boxes, and when I set the STEP to low active they functioned correctly. It certainly is a steep learning curve when you start in CNC, but thanks to you I'm continuing my slow crawl up the slope.
Many, many thanks, Denis.
 

3

General Mach Discussion / Re: Motor problem

« on: December 10, 2008, 07:25:11 PM »

I think I have it worked out. Here is the xml.
Denis

4

General Mach Discussion / Re: Motor problem

« on: December 10, 2008, 07:22:33 PM »

I have the xml file Hood, but cannot work out how to send an attachment with this reply. There doesn't seem to be a button in "quick reply", the only way I know to give you an answer, which allows you to add an attachment, as in normal email programs.
Denis.

5

General Mach Discussion / Re: Motor problem

« on: December 10, 2008, 06:58:16 PM »

I checked the the voltage coming out of the PP and it is 3.5V. When I jog it drops to 3V. When I jog the other way the voltage does not change. The voltage at the BOB pins is 5V, and when I jog I get the same result with the voltage dropping to 4.2V when jogging one way, and not changing at all the other way. The motor runs roughly when the voltage drops, smoothly when it remains high. The BOB is powered at 5V by it's own transformer.
Denis

6

General Mach Discussion / Re: Motor problem

« on: December 10, 2008, 05:36:11 PM »

Hi Hood, I've checked the port assignment, and swapped the pin assignment for step and direction, and it has no effect. I changed the active state and same result. I checked all wiring from the motors to the drivers, and from the BOB to the drivers, and all appears correct. When the motors run in one direction, the correct one I assume, they run smoothly, while in the opposite direction they are rough and jerky!

Many Thanks, Denis.   

7

General Mach Discussion / Re: Motor problem

« on: December 09, 2008, 11:22:12 PM »

You're a genius Hood. Why is it the thing that you don't check that is the problem? One of the steppers was not wired correctly when I joined the pairs, and the wiring to the drivers from the other motors was also incorrect. Only myself to blame! I now have motors turning when I toggle, but they go in one direction only, whether I hit plus or minus. Maybe I've wired something else incorrectly. Thanks again Hood.

8

General Mach Discussion / Motor problem

« on: December 09, 2008, 07:35:10 PM »

Hi, I've just joined the forum, having just built a CNC Router. After having problems getting an output from the parallel port, which I eventually  found was a problem with the port driver, I now have an output, but the motors will only oscillate. They move in one direction for a fraction of a revolution, then reverse for the same amount continually when in jog mode. All my electrical equipment is Keling.