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1

General Mach Discussion / Good or bad stepper motor?

« on: April 14, 2007, 03:58:25 PM »

 I have finally got my machine working and cutting good. But there may be a problem with my motors.
140oz stepper 8 wire, Hobby cnc board.

At very low speeds you can here the motor turn its steps. Y axis seems louder that the X axis. The X gantry is built in steel but the Y is built in timber (main frame). I was thinking that is because ones set in timber and the others steel. So I removed the motors and held the to together on a board. Ran Mach3 then ran each motor at low speed. Doing about 20 rpm the vibration on one motor is twice as loud as the other.
Every thing is set the same for both motors.

Is this normal or do I have a doggy motor?
Cutting is fine at the moment.

Roger

2

General Mach Discussion / Missing steps

« on: April 12, 2007, 02:48:21 AM »

Hi All
I thought I had done it but I didn’t. I have been messing and building my router now for about a year. I have now got to the stage were I can cut something. My setup was.

Hobby cnc board
140oz steppers 8 wire
X 20dia screw
Y 20dia screw
Z16dia screw all stainless steel.

computer was
500Mz process
256ram
and nVidia 64meg card
with win 2000

I have cut out shapes to see it working. It goes very good and is a good feeling.
Last week I downloaded Vcarve demo and put in the Bulls head sign test file.
I was amazed what this was doing. Then after 5-10 minutes I heard the motors stall and the DRO kept going then the motors started and cut well off line. So I looked through the forum to pick up some tips. I thought, computer. So yesterday I bought some bits and built a new one just for my machine.

Processor 3.3Gz
Ram 512MB
64MB nVidia card on board
win 2000

Last night set it all up and it was so quick loading and changing screens. But guess what, it done it again. Same code different position.

Roger