Hi All. I'm a CNC / Chilipeppr newbie,

Hi All.

I’m a CNC / Chilipeppr newbie, but have a good deal of physical computing / general technology experience.

I’m working in the Sculpture Department @ the Milwaukee Institute of Art and Design, and we recently were given an old small CNC from Isel-Automation.

I’ve removed the old controller board, and replaced it with a TinyG, and have been playing around with Chilipeppr. All is going well enough, aside from an odd issue with the X axis. The jog controls are reversed. If I instruct Chilipeppr to jog left, the machine moves right. If I try to home the machine the X axis moves away from the limit switch. (Y and Z are fine).

However, the files cut in the correct orientation. If I reverse the polarity of the X stepper, the machine homes and jogs correctly, but the cuts are reversed on the x-axis (mirror image).

In all instances, the simulator works fine. I’m running firmware build 440.20.

I’ve tried the Chilipeppr logo file and a file generated with JSCut. Both behave exactly the same.

Everything I’ve read suggests I reverse the polarity, which I’ve done, but that doesn’t solve my homing problem.

Any thoughts?

Sure sounds like a polarity problem but if your job runs ok then I’m confused too

In your CAD/cam software you may need to change your origin. If your origin is on the lower right corner it could be outputting negative values for X take a quick look at your code and see if all your X values are negative

Thanks for all the replies. Here’s what I did to fix the problem / my thinking. I reversed the polarity of the X axis so it behaved correctly with the jog controls. I then reversed the polarity of the y-axis. It occurred to me that my machine is fixed gantry, so I was operating the y axis incorrectly.

The only other adjustment I had to make was changing the y homing switch from y-min to y-max.

It’s all working fine now.