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1

General Mach Discussion / Stepper Speed on XYZ Router

« on: January 14, 2010, 04:21:56 AM »

The router table, steppers and drives were provided by foundertop, but a long time ago. I don't have any information on the drives, but I've reversed engineered a lot.

Motors do say 4A, 6.5 Nm. Ball screw pitch is approximately 0.175". In general, the fastest velocity I can get is about 35 ipm using a 10 accel. This is with 2000 to 2200 steps per inch.....I just got it close enough for now (less that 0.060" error out of 1"). I don't know what the 4 dip switches on the drives control, as it's written in chinese. The motor appears to be a hybrid stepper (i took it apart).

The router table is approximately 4'x4'. I haven't been able to find out much as to the voltage of the motors.

Speeds above the 35ipm cause the motor to resonate unstably. I changed the pulse duration on both the step and dir to 5uS, but it didn't improve. I've tried running Mach3 at 25KHz up to 65KHz, didn't improve it either.

Thank you,

2

General Mach Discussion / Driver Test Not What Expected

« on: January 07, 2010, 10:54:22 PM »

I've tried this install and test on two machines now. The test reults just seem way to low compared to what I've seen others machines on this forum doing. Mach3 is the latest version just downloaded last week.:

#1 HP Desktop, P4 3GHz Processor, 2GB Ram, Integrated graphics, XP home. Was unable to convert install to the standard PC. Removed most all start up services, except the ones that looked crucial for basic function. No startup programs or other programs installed. Performed all other optimizations. Set the PP in the bios to ECP, and EPP separately to confirm test.

25KHz
16500 Pulses Per Second
57uS short
63uS long
Graph fairly steady...Looks good

#2 Abit BH7 mobo, P4 1.8GHz, 1GB Ram, ATI 9700 128MB Memory (AGP) Graphics Card. XP Pro configured as Standard PC, APIC off in BIOS, Removed most all start up services, except the ones that looked crucial for basic function. No startup programs or other programs installed. All other optimization steps completed.

25KHZ
12500 Pulses Per Second
79uS Short
85uS Long
Majority of graph is above the max scale of 80uS

on both test the APIC constant is reported as 8100, and the APIC light is green??? I will be using this to control 3 stepper motors on a router table.

I would have expected that the PPS would have been over 35K or so, based on what I've seen other machines report on here. I'm ready to dive in, so I'm all ears.