Re: mach3 Referencing Issues
Ok looks to be like your running 2 drives from one Motor Output.? This isn't good and could be the cause of your troubles. So I would sort this before looking further.
Re: mach3 Referencing Issues
Hi JAZZCNC
Thanks a lot for your reply.
Could you please explain? How did you figure that out? is it form the pictures that I provided? Please explain
what is the fix for that problem?
Regards
jhonansaro
Re: mach3 Referencing Issues
Hi there
Problem resolved, since I was using 2 different kind of Home Switch, apparently they created some kind of noise, that after adding some relay switches to my limit switch the problem is resolved and all is fine.
Regards
Jhonansaro
Re: mach3 Referencing Issues
Quote:
Originally Posted by
jhonansaro
Hi JAZZCNC
Thanks a lot for your reply.
Could you please explain? How did you figure that out? is it form the pictures that I provided? Please explain
what is the fix for that problem?
Regards
jhonansaro
I figured it out because you only have 3 Motor axis enabled. The fix is easy you need to connect one of the drives to another Motor Output and then use Slaved axis.
I see your post about different Home switches but still the way you are running the machine from one Motor Output isn't correct and will cause you troubles at some point. The problem comes from pulse timing and over long jobs then any latency in timing will have an affect on position.
The only exception to this is if the Servo drives provide a slaving option. In this case, you will have the slaved drive connected to the master drive via a cable so will be easy to tell.
Also the way you have it setup now then your only homing to one Switch on one side. If there is any error between the motors/screws it will never be corrected and over time this will twist and rack your gantry.
If you had it setup to use slaved axis then you could home each side to it's own switch and be sure the gantry is square. Also because your using servos you could use the Index pulse of the encoders to ensure accurate homing of each motor.
Re: mach3 Referencing Issues
Hi jazz
Thanks a lot for your reply, The motors are running in opposite direction right from the control board, s therefore I do not need to slave it anymore. But on the issue of second switch, sounds interesting please explain, particularly on Index pulse, how this can be done?
Also another challenge is placing the switch itself, which must be in exact position of the other one.
regards
jhonansaro
Re: mach3 Referencing Issues
Quote:
Originally Posted by
jhonansaro
Hi jazz
Thanks a lot for your reply, The motors are running in opposite direction right from the control board, s therefore I do not need to slave it anymore.
Think you misunderstand what slaving is about. It's nothing to do with running motors in opposite directions. It's about two separate Motor outputs working as one unit. The way you have it wired you are using just one output which is sharing it's pulses between two drives. This can lead to timing issues between those drives because cannot gaurantee they will both see pulse exactly at same time. Pulse timing is critical.
Also like mentioned it also affects homing because only using one switch.
Regards using the Index pulse then this depends on your Drives and if they have Index pulse output and allow Home to index feature. Most servo drives do, in this case you can tell the drives to home to index by using one of it's inputs then when at home position it turns on it's Index output which then tells controller at home location.