configuring the 4th axis

Hi,

I added the 4th axis to my 3 axis cnc and now I have trouble configuring it. I kept the same parameters as for the other three axes as the motor seems to be the same.

Here is the link of what I bought (i am now using only the fourh axis not the fifth)

www.ebay.ca/itm/CNC-Router-Rotational-Ax...=item3ccf69576a#shId

And here is the screenshot of the stepconf wizard showing the parameters that work fine with other three axes.



When I test the axis and I set it to travel 1 degree, it goes almost full three circles 3X360 degrees! I am not sure which of these parameters needs to be changed. I played around with leadscrew pitch and steps per revolution but didn't improve. I left the leadscrew pitch exactly the same as for the other motors. Can a motor be damaged if i let it run at the wrong step per revolution or wrong leadscrew pitch?


Thanks!

BigJohnT wrote:

Why do you have pitch as a negative number?

If this is the direct drive one then the pitch should be 0.002777 if I calculated it right.

JT

I just tried the nubmer you suggested. It makes the motor axis squeel and not move. Hopefully I am not killing it.
The negative number helps the previous three axes move in the right direction. Otherwise they go the opposite way.

BigJohnT wrote:

Invert the direction pin to change directions.

Are you sure you have 16 micro steps? If not your driving the stepper 16 times too fast... what driver do you have?

JT

I am using a 4-axis driver control board from. www.easy-cnc.com They do not reply to my emails. The picture of the boards is in my previous post:
www.linuxcnc.org/index.php/english/forum...achine-into-a-5-axis

All other motors are set to 16 microsteps and work fine. In fact, once they are set to 8 I get a carving that is twice as big as the g-code says.