G99 not working with encoder

[WabecoD600]

Hello,

I cant get my lathe to run G99, It stops with an unknown fault. I have a spindle encoder installed and the correct rpm read out on the screen. at one point I got an error n# 438. any ideas?

thanks Rob.

[CentroidFrog]

Hi Rob,
Welcome to the forums!
Please post a fresh report.zip for us from your machine.
Here's how:

[WabecoD600]

report_B83DF60BE626-0204259080_2025-05-20_13-16-38.zip

(1014.44 KiB) Downloaded 5 times

Here is the report.
I added a - in front of the spindle encoder count, that seemed to solve the problem..?

[CentroidFrog]

What motors or drives are you using?
12,800 steps/rev is pretty high for most stepper motors.

[WabecoD600]

that is lead shine motors and drivers, with encoders, I have set the dip switches so that it steps 12800. They run pretty smooth, and the precission is very close to perfect without adjustement.

[suntravel]

438 Spindle slave position error

The slaved axis moved too far in the
wrong direction during a
spindle-slaved move (such as in rigid
tapping). The job is cancelled.

Check Parameter 34 for an
incorrect plus/minus sign in front of
the encoder counts.

Uwe