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General Mach Discussion / Re: Losing steps in one direction each axis
« on: March 26, 2010, 08:31:56 PM »
Well I found a post by the OP in the above linked thread with his solution.
I will try and decipher this and see if I can work this out. What has me really turned around though is that the issue did not present itself when running on the laptop, The computer it well away from the bob and drivers (4') but plugged into the same circuit.
w3
Quote
I started a thread called "is this a bug in Mach 3" as i was having a similar sort of problem. It's been deleted.
I was consistently gaining steps which it seems that you have the same problem.
I have now resolved the issue and it was down to one of three things.
1: I was using a BOB that had opto isolated outputs and my drivers had opto isolated inputs. IE two sets of opto isolators.
2: There was noise in the BOB board.
3: I hadn't wired the drivers correctly.
The problem is resolved due to a change of BOB that no longer has opto isolated outputs to the drivers
I also changed the wiring to the drivers the original wiring had a common ground the steps and direction were connected to the positive side of the drivers they are now wired as 5V common the negative now controls the steps/dir signals
Basically what was happening was on every direction change some extra steps were added.
It happened on every axis by the same amount.
HTH
Phil_H
I will try and decipher this and see if I can work this out. What has me really turned around though is that the issue did not present itself when running on the laptop, The computer it well away from the bob and drivers (4') but plugged into the same circuit.
w3