Machsupport Forum
Mach Discussion => General Mach Discussion => Topic started by: wade16 on August 04, 2014, 02:28:49 AM
-
When I move the 3 axis, they start to move and then they slow down almost to a stop, and then they accelerate up to the correct feed rate. How do I eliminate that problem?
-
Are you meaning jogging or via code or?
If code please attach and say approx where it happens.
Hood
-
When I jog and when it feeds during the program run, the motors accelerate to speed and then almost immediately, the motor decelerates to a quick stop, and then accelerates back up to speed. This happens each time the axis changes direction or begins the initial movement. How do I insert the xml file?
-
either copy the xml and rename it something unique or zip it with a unique name then use the additional options button on the reply page to attach.
Hood
-
I am sending the file.
-
Go into General Config and change to CV mode rather than Exact Stop.
It is always preferable to have an initialisation line in your G Code that sets modes such as CV or Exact Stop, G64 for CV.
Hood
-
I will try that and let you know. Thanks for the help.
-
Hood,
I changed to CV, but it still happens when I rapid jog. Could it be a motor tuning problem?
-
I dont have a 32bit computer here to test with but will try tomorrow at the workshop if I remember ::).
Do the DROs show the axes moving like that?
What is the frequency and Time In Int on the diagnostics page?
Hood
-
I see you have backlash enabled and the shuttle accel on Gebneral Config seems quite big. Disable backlash and see if it helps, if it does reduce the shuttle accel.
Hood
-
Where is backlash? I don't see it in general config. The shuttle accel is set on 1
-
Config menu then Backlash. You may have to restart Mach for it to take effect.
Hood
-
That seems to have fixed the problem. All axis move in fast jog with no hesitation. Thank you very much.
-
If you need the backlash you could reduce the shuttle accel and see if it helps, maybe 0.05 or something. Dont use backlash myself so not sure what the normal settings would be but I would imagine you want it a short time.
Hood
-
I will keep that in mind. Thanks.