No movement on one axis

I am not sure any other setup issue. The machine had been setup and under testing now. Also, I had setup the Halui for the HOME and START signal by the help of John.

However, I found sometime the step motor had been hang and not movement by using the jogging mode.

I just tested by a simple Gcode and run on the machine.

1. G20
2. G90
3. G64 P.0.01
4. G17
5. F10
6. G0 X2 Y-3
7. G1 Z-0.1
8. G1 X1.5 Y-3
9. G1 X1.5 Y-2 (stay at x1.5 and not move to x2 follow next step however, if I change the line 7 to G1 Z0.1 or without Z-axis movement and the program running smoothly)
10. G1 X2 Y-2
11. G1 X2 Y-3
12. G0 X0 Y0 Z0
13. M2

The information of the machine setting
EMC2 2.4.6 (Installed by using Live CD Ubuntu 10.04 and upgarded from 2.4.3)
Stepping motor kit with the driver card from Fireball.
Intel MB D945GCLF.

The hardware should be working fine and tested by using other CNC s/w.

Please help!

John, I just found out that I need to set up the drive enable on parport pin 14, 16 & 17 for XYZ. So far, I have no problem for the movement.

But the way, I am using the PLC to control the CNC start and go home by Halui. I am just thinking to cut the power on the motor driver when idle or program complete. Every cycle, I will power up the driver card, go HOME and start the program. Do you see any problem or it will hang up.?

Thank & My Best Regards,
Dason.

i ran this test a number of times and having trouble. the first part of the test, Z is correct. but in the second part of the test,i gain a about .002" after each run. i ran the test on all the axis and it's only on Z that i have this problem. this is a sherline mill with stepper motors running emc2.4.6.
i attached the ini file if needed.Thanks for any help.


[AXIS_0]
TYPE = LINEAR
HOME = 0.0
MAX_VELOCITY = 0.335
MAX_ACCELERATION = 12.000
STEPGEN_MAXACCEL = 10.0000
BACKLASH = 0.000
SCALE = 16000.0
FERROR = 0.05
MIN_FERROR = 0.01
MIN_LIMIT = -9.500
MAX_LIMIT = 9.500
HOME_OFFSET = 0.0

[AXIS_1]
TYPE = LINEAR
HOME = 0.0
MAX_VELOCITY = 0.335
MAX_ACCELERATION = 12.000
STEPGEN_MAXACCEL = 10.0000
BACKLASH = 0.0000
SCALE = 16000.0
FERROR = 0.05
MIN_FERROR = 0.01
MIN_LIMIT = -5.000
MAX_LIMIT = 5.000
HOME_OFFSET = 0.0

[AXIS_2]
TYPE = LINEAR
HOME = 0.0
MAX_VELOCITY = 0.335
MAX_ACCELERATION = 12.0
STEPGEN_MAXACCEL = 10.0000
BACKLASH = 0.0000
SCALE = 16000.0
FERROR = 0.05
MIN_FERROR = 0.01
MIN_LIMIT = -5.0
MAX_LIMIT = 5.0
HOME_OFFSET = 0.0

do i lower my STEPGEN_MAXACCEL as well ?

like;

MAX_ACCELERATION = 10.000
STEPGEN_MAXACCEL = 8.0000

From the manual..

"STEPGEN_MAXACCEL = 21.0 ( HAL ) Acceleration limit for the step generator. This should be 1%
to 10% larger than the axis MAX_ACCELERATION. This value improves the tuning of stepgen’s
"position loop". If you have added backlash compensation to an axis then this should be 1.5
to 2 times greater than MAX_ACCELERATION."

Rick G

if i understand this, i can make STEPGEN_MAXACCEL = 50.000 and MAX_ACCELERATION 1% to 10%
smaller; 47,500(5%). what do i use to get the max for STEPGEN_MAXACCEL ?