Re: [CAD_CAM_EDM_DRO] Re: Deskncrt

>
> --- In CAD_CAM_EDM_DRO@y..., shymu@b... wrote:
> > I bought Cncpro for the constant contouring feature. However I'm
> > having trouble getting it to work properly. I had played with
> > Deskncrt in the past and loved the smoothness, but couldn't keep it
> > from overshooting the tool path. I'm running at 2000 steps per in.
> > Max speed is 10 inchs a sec. Using servo's with encoder feedback to
> > hardware (Gecko G320). If using Deskncrt in an open loop mode why
> > would the PID need to be tuned. Can someone help with some basic
> info
> > for setting up Deskncrt to get me started in the right direction?

if it is overshooting, then either the max velocity or the acceleration is
set
too high. I don't know DeskNcrt, but I do know EMC. There must be a
setup file, and it should have a line for max_velocity and/or
default_velocity,
and max_acceleration and default_acceleration. Check what those values
are set to. They probably are in inches/second and in/sec^2. If you set
the accel parameters higher than the servo amp/motor/power supply
combination can provide, then the computer will get ahead of the physical
hardware, causing the exact problem you describe.

Umm, 10"/sec is 600 IPM. Can your machine really move that fast?

Jon