Help needed: Just one axis will work!?
27 May 2013 00:30 #34727
by cncbasher
Replied by cncbasher on topic Help needed: Just one axis will work!?
as the z axis depths show an increasing depth of cut
the most likely problem is one of loosing steps ..
probable cause is too high acceleration and velocity settings , coupled with using too high microstepping ,
the higher the microstepping less torque you have available , and because also the z axis has to fight against gravity , it slips down
for z axis you need as much torque available as possible to counteract
the most likely problem is one of loosing steps ..
probable cause is too high acceleration and velocity settings , coupled with using too high microstepping ,
the higher the microstepping less torque you have available , and because also the z axis has to fight against gravity , it slips down
for z axis you need as much torque available as possible to counteract
Please Log in or Create an account to join the conversation.
27 May 2013 00:59 #34730
by andypugh
You could be losing steps, or it is possible that the bit is pulling out of the collet.
Losing steps seems the most likely. Try half the accelleration you currently have on the Z.
You can test the settings by jogging with the jog speed set high. I think you have to restart LinuxCNC for INI file changes to stick, though.
Replied by andypugh on topic Help needed: Just one axis will work!?
What could be the reason for such change in Z axis during the processing of the G-Code?
You could be losing steps, or it is possible that the bit is pulling out of the collet.
Losing steps seems the most likely. Try half the accelleration you currently have on the Z.
You can test the settings by jogging with the jog speed set high. I think you have to restart LinuxCNC for INI file changes to stick, though.
Please Log in or Create an account to join the conversation.
28 May 2013 01:35 #34776
by Alex_HH
Replied by Alex_HH on topic Help needed: Just one axis will work!?
Hello Andy,
I changed my settings back to
5000ns
5000ns
20000
20000
1/2 steps mode
75% current.
and reduced the acc to 200mm/s2 (before it was 381mm/s2).
But unfor. nothing changed.
I touched the surface of the part and homd z to 0.
Within the second G-Code I change Z-2 to Z0 to have a clear visual indication of the tool.
The first line was fine - the tool touch the surface.
But the second line was bad - the tool dived nearly 5mm deep into the material....
What can I do to narrow the problem?
I'm lost...
Alexander
I changed my settings back to
5000ns
5000ns
20000
20000
1/2 steps mode
75% current.
and reduced the acc to 200mm/s2 (before it was 381mm/s2).
But unfor. nothing changed.
I touched the surface of the part and homd z to 0.
Within the second G-Code I change Z-2 to Z0 to have a clear visual indication of the tool.
The first line was fine - the tool touch the surface.
But the second line was bad - the tool dived nearly 5mm deep into the material....
What can I do to narrow the problem?
I'm lost...
Alexander
Please Log in or Create an account to join the conversation.
28 May 2013 01:38 #34777
by andypugh
What do you get if you set the jog speed fairly fast and jog the Z-axis up and down?
Do you see any sign of it stalling?
Replied by andypugh on topic Help needed: Just one axis will work!?
The first line was fine - the tool touch the surface.
But the second line was bad - the tool dived nearly 5mm deep into the material....
What do you get if you set the jog speed fairly fast and jog the Z-axis up and down?
Do you see any sign of it stalling?
Please Log in or Create an account to join the conversation.
28 May 2013 01:52 - 28 May 2013 02:12 #34778
by Alex_HH
Replied by Alex_HH on topic Help needed: Just one axis will work!?
Andy,
at acc of 200mm/s2 II set jogspeed to 1524mm/min (it is the max jog speed), at that rate I see problems - the motor is running, but the axis (threaded rod) is not moving smootly or just little by little.
In steps I reduced the max speed and acc to the following - at that rate there was no stalling during max jogspeed test. My settings are now:
max speed 12.5mm/sek
acc 70mm/s2
I will test this setting now with a g-code programm.
Alexander
at acc of 200mm/s2 II set jogspeed to 1524mm/min (it is the max jog speed), at that rate I see problems - the motor is running, but the axis (threaded rod) is not moving smootly or just little by little.
In steps I reduced the max speed and acc to the following - at that rate there was no stalling during max jogspeed test. My settings are now:
max speed 12.5mm/sek
acc 70mm/s2
I will test this setting now with a g-code programm.
Alexander
Last edit: 28 May 2013 02:12 by Alex_HH.
Please Log in or Create an account to join the conversation.
28 May 2013 02:38 #34785
by andypugh
That sounds plausible. My milling machine runs at 11mm/s and 100 accel.
Replied by andypugh on topic Help needed: Just one axis will work!?
In steps I reduced the max speed and acc to the following - at that rate there was no stalling during max jogspeed test. My settings are now:
max speed 12.5mm/sek
acc 70mm/s2
That sounds plausible. My milling machine runs at 11mm/s and 100 accel.
Please Log in or Create an account to join the conversation.
29 May 2013 01:51 #34864
by Alex_HH
Replied by Alex_HH on topic Help needed: Just one axis will work!?
Hello Andy,
I tested the new setting some minutes ago. It seems everything on Z axis is now correct!
Many thanks for your help!
My new settings for z axis are:
acc = 70mm/s2
max speed= 11mm/s
Best regards from Germany
Alexander
I tested the new setting some minutes ago. It seems everything on Z axis is now correct!
Many thanks for your help!
My new settings for z axis are:
acc = 70mm/s2
max speed= 11mm/s
Best regards from Germany
Alexander
Please Log in or Create an account to join the conversation.
Time to create page: 0.184 seconds