Machsupport Forum

Mach Discussion => General Mach Discussion => Topic started by: Tristar500 on December 08, 2009, 03:41:49 PM

Title: G31 scanning slow z speed?
Post by: Tristar500 on December 08, 2009, 03:41:49 PM

I'm using mach 2 (have mach III too) do digitize with a high speed probe I built.

Anybody know how to get the mach to pick up the speed of the z axis during a G31 op?

Looks like mach really slows down the z axis during a scan, (it's only slow on the way down, z axis runs full bore on the way back up to zero)

Any ideas?

Thanks

Title: Re: G31 scanning slow z speed?
Post by: ger21 on December 08, 2009, 06:53:31 PM

Do you have a feedrate command in your probing code?

Title: Re: G31 scanning slow z speed?
Post by: Tristar500 on December 08, 2009, 08:02:40 PM

Quote from: ger21 on December 08, 2009, 06:53:31 PM

Do you have a feedrate command in your probing code?

I don't but was able to basically add in an F300 one line then a F100 a line or two down with a word processor and that does the trick.

Just wondering if there is a way to tell mach to run the z axis at a given speed during a G 31?

Title: Re: G31 scanning slow z speed?
Post by: rrc1962 on December 08, 2009, 08:15:12 PM

I noticed a similar issue. The plunge speed on a G31 seems to be OK but the Z acceleration on the plunge move appears to be that of the X and Y axis.   The retract move is normal.  X and Y acccel is set at 8 and z is 30. I didn't notice this until I lowered the X and Y accel. I do have a feedrate command in the G31 line. Probably work on this more tomorrow.