If I try to cut a circle (R65) with a 6mm endmill at 1500 mm/min there is no problem. I can run the same code at 6000mm with no problem.
BUT, if i run the code at 1500 mm/min and use feedrate override at 200% (F3000) it "stutters" (shakes) at the all the 90 degree point of the circle (where x and Y mixes).

The machine shows that it can handle 6000 mm+, could it be that its my computer having problems calculating and sending the pulsestream in the parallel port when using override?
Its not a very fast computer, but the mach 3 test tool says it can handle 35khz, and the software is set to that.

any ideas?

Cory

if you are running Mach3 then check the version number. 
I think version # 62 works ok but not 66.
Ray

Hi Ray

I am running v3.043.066.
Are there any known bugs on pulse control or similar on the .066 v?

I just installed it, and of course used the latest version.


best regards
Cory

yes I had the same problem you are having with version 66.  Version 62 seems to work fine.
Ray

Using high FRO values is a known issue with Mach3. It's best to program at double the feedrate, and start with a FRO of 50%.

Thanks for the info guys, I have to make some testcuts with different feedrates first to determine the settings in the tooltable.

I cannt seem to find any other versions than 0.66 on the download site.

Are there any other sources for previous versions?

BR
C

The FTP site has older versions.
http://www.machsupport.com/software/downloads-updates/#tabs-6