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**General Mach Discussion / HELP! My Z axis is moving in chunk steps**

« **on:**May 24, 2011, 10:41:08 AM »

Here is the problem.

I have a 4th axis machine where A is the chuck X moves the length of the object being machined and Z is the depth.

The A axis keeps a perfect continuous RPM and the X axis is moving constantly at say the rate of 128th of an inch per second and the servo motor for the X has a constant smooth rotation. However the Z axis servo is not moving except every few seconds and it then moves about 10deg instead of much smaller say 1/2 deg steps. Is there a setting I am missing or is my G-Code wrong?

A Few Facts

All 3 axis are Yaskawa Servos

Z axis is a ball screw driven by a 10:1 gearhead

Here are a few line of G-Code

N000035 A1440 X0.077 Z-0.00281176075414713;

N000036 A1440 X0.077 Z-0.00285099436525282;

N000037 A1440 X0.077 Z-0.00288965724492307;

N000038 A1440 X0.077 Z-0.00292777388626453;

N000039 A1440 X0.077 Z-0.00296536717817242;

N000040 A1440 X0.077 Z-0.00300245854969372;

N000041 A1440 X0.077 Z-0.00303906809810783;

N000042 A1440 X0.077 Z-0.00307521470288652;

N000043 A1440 X0.077 Z-0.00311091612742498;

N000044 A1440 X0.077 Z-0.00314618911008591;

N000045 A1440 X0.077 Z-0.00318104944591235;

N000046 A1440 X0.077 Z-0.00321551206015691;

N000047 A1440 X0.077 Z-0.00324959107459355;

Thanks in advance

Curtis

I have a 4th axis machine where A is the chuck X moves the length of the object being machined and Z is the depth.

The A axis keeps a perfect continuous RPM and the X axis is moving constantly at say the rate of 128th of an inch per second and the servo motor for the X has a constant smooth rotation. However the Z axis servo is not moving except every few seconds and it then moves about 10deg instead of much smaller say 1/2 deg steps. Is there a setting I am missing or is my G-Code wrong?

A Few Facts

All 3 axis are Yaskawa Servos

Z axis is a ball screw driven by a 10:1 gearhead

Here are a few line of G-Code

N000035 A1440 X0.077 Z-0.00281176075414713;

N000036 A1440 X0.077 Z-0.00285099436525282;

N000037 A1440 X0.077 Z-0.00288965724492307;

N000038 A1440 X0.077 Z-0.00292777388626453;

N000039 A1440 X0.077 Z-0.00296536717817242;

N000040 A1440 X0.077 Z-0.00300245854969372;

N000041 A1440 X0.077 Z-0.00303906809810783;

N000042 A1440 X0.077 Z-0.00307521470288652;

N000043 A1440 X0.077 Z-0.00311091612742498;

N000044 A1440 X0.077 Z-0.00314618911008591;

N000045 A1440 X0.077 Z-0.00318104944591235;

N000046 A1440 X0.077 Z-0.00321551206015691;

N000047 A1440 X0.077 Z-0.00324959107459355;

Thanks in advance

Curtis