[reithguitars]

Thanks for the comments and open dialog.

I too agree it is an issue with the spindle control PCB and how it interfaces with Mach. My PCB is version 1.4.

If I set the speed manually, the spindle seems to hold that speed and operates properly. I have tested the RPM with an optical tachometer and it is +/- 3 RPM. That is reasonable.

On my machine I can still operate the x,y, & z axis via Mach in manual mode. The switch only appears to effect the spindle.

I am amazed of the level of denial. I have seen posts regarding this behavior back to 2007. I wish Syil would officially state there is an issue, and they are trying to resolve it. If it is broke ... it is broke.

However, I am encouraged that Syil China chimed in above. Hopefully their engineer will bring a solution.