Problem with mach3 turn. I think

[terry1956]

Hi, can anyone in the know please help. Here is the set up. Lathe converted to mach3. No limit switches on machine yet. G-code produced by fusion 360. The test piece is to machine a 17mm bar down to 10mm diameter for a length of 30mm. The simulator within fusion 360 looks ok.
With the lathe, first I don’t understand offsets fully so only use clearance movements set out in fusion. I move the cutter to the outer edge of the material. Set mach3 home in this position and also part zero on both axis.
However when I start the job the tool just moves towards the chuck without cutting and I need to stop the job.
The start point should be the front leading edge of the material so I don’t understand what is going on. Can anyone point me in the right direction. Thanks

[dh42]

Hello

Maybe a track ; With Fusion and Milling GCode, Fusion always write a G28 at the beginning of the code ; I don't know if it is also the case with turning Gcode, but if it is the case, you can remove the G28 to do a test. Note that the G28 return position is defined in Config/Homing limits menu.

If removing the G28 in the Gcode do the trick, you can permanently remove it by editing the post processor and change the "safe retract" value.

Have a look on the picture on this subject.

http://www.metabricoleur.com/t20125-...e-gcode#398279

++
David