[Rhodan]

A few folks on different boards have been having problems with jerky motion on their machines (including me). The machine acts like Constant Velocity is not turned on even though the little green border is lit around the CV button.

A poster on the Mach support board suggested I turn off CV (go to exact stop) on the general config page, and turn off the CV Feedrate button on the Settings Tab then add G64 (Turn on CV mode) in my gcode. I tried this and it worked!

After a bit of experimenting I figured out that all I really have to do is go and turn off the CV Feedrate button on the settings tab and everything is good. Only problem is that it comes on by default whenever I start mach.

I also noticed that choosing "save settings" from the config menu somehow turns CV Feedrate on. So if I change anything I have to remember to go turn it back off again.

Hope this helps if anyone is experiencing the jerky motion.

[Claude Boudreau]

well what is the use of the button if you have to do that?

[ger21]

As long as you turn off all the CV options, it should work just fine turning it on and off with the CV button.

[Claude Boudreau]

As long as you turn off all the CV options, it should work just fine turning it on and off with the CV button.

Still a bit confused about the cv feedrate in the setting tab window , when should someone use it ? after setting my motor at a different feedrate with motor tunning,and,( with C.V. on), I had to match the feedrate in the setting tab for them to work properly...

[ger21]

Still a bit confused about the cv feedrate in the setting tab window , when should someone use it ?

When you know exactly what it does and how it works, and you know that you need it.

The general rule for the majority of users when using CV mode is to turn ALL the CV settings off.

[Claude Boudreau]

When you know exactly what it does and how it works, and you know that you need it.

The general rule for the majority of users when using CV mode is to turn ALL the CV settings off.

can you name all the cv setting in mach3?

[ger21]

I think there are 4 in the General Config, and the 2 on the settings page. Looks like 1 is duplicated.

General Config:

Plasma Mode
Distance Tolerance
G100 Adaptive Nurbs
Stop CV on Angles >

Then, on the settings page, you have:
CV Distance
CV Feedrate

The CV doc on the Mach website has more info.

http://www.machsupport.com/docs/Mach3_CVSettings_v2.pdf