Re: [CAD_CAM_EDM_DRO] Position counter stop updating....

lti_cnc wrote:

> Hi forum
>
> I had installed EMC using BDIemc209-01.img
> After successfully configuiring it with STG2 and interfacing
> with limit switches. Now I am having some problems:
>
> 1. Position counters stop updating when I try to jog. This
> perticularly happens when Motor tries to run at high speed.
> When I run the motors using Testing dialog box present with
> and set Voltage to any drive to 0.1V~1.0V or so then the position
> counts are OK but as soon as i give it more voltage like 3.0 or above
> position copunter for that axis hangs up! and stops incrementing or
> changing. Although the beds are running.
> Please suggest why this is happening?

What speed of CPU are you using? When the counters stop counting, do
you see a following error box pop up on the screen? Does it go into
estop-off mode from machine on? (See below)

> 2. Following errors are nightmare for me!! I have set (in the ini)
> P = 7
> I=0
> D=0

P=7 is WAY too low, I think. I run around 400 on my system. I'd suggest
you change P to 100 and see how it performs. I set FF1 to about 5, but
I'd get rid of the following errors first, before touching FF1.

>
> and all those FF gains are set to 0
>
> The follwoing errors are now less than what they were before when I
> set FERROR = 1.0
> and MIN_FERROR = 1.0

Yes, but this allows the machine to be more than ONE WHOLE INCH
out of position, which may not be what you want. You need to get the
servo system performing much better than this before cutting metal!
You should have it so that following error when not moving is around
.0001", and when moving is somewhat less than .050" at the worst.
High-powered commercial machines keep following error down under
.001" at the highest feed rates, and only exceed this at rapid traverse
rate. Some of our home machines don't have the power to quite reach
that performance, but you need a LOT tighter control than +/- 1 inch!

Jon