[Ranscon]

My homebuilt machine (router) using mach 3 runs choppy on arcs. When I set it to run on CV mode, my steppers stall. I,m only running the machine at 48ipm. Does anyone have any suggestions? Should I slow down my feed rates? I would like to double my feed rates but can't seem to work it out. Any suggestions on motor tunings? Running keling 425's with 24v PS. 1/2-10 Acme's.
Thanks, Jeff

[ger21]

Turn off all CV options, both in General Config and on Settings page.

[Ranscon]

But I think I want to run in CV mode. Won't that make my machine move smoother? Should I try to slow my feeds till it no longer stalls? Should I just leave it alone? I run some programs with a lot of curves. My feeds are set at 48 but the machine fluctuates between 4 and 18 through 90% of the cutting.
Wouldn't this be a case of "slow down to go faster"? If I lowered my feeds to 30ipm with CV mode on, wouldn't it cut this in about 1/2 the time? Or, am I just confused? Also, what are the pro's and con's of CV mode please.
Thanks, Jeff

[ger21]

Turn off the CV options, not CV mode.

If you're not reaching the commanded feedrate, it's probably due to a low acceleration setting. What is your accel set at?

[Ranscon]

My accelerations are set low, about 4 or 5 I believe.
Jeff

[ger21]

Can you get them up to 8 or 9? You'll see much faster cut times. Even if you have to lower the velocity a bit.

[Ranscon]

I'll try that tomorrow
Thanks, Jeff