Help understanding tool change restart speeds?

[ssutton]

When a tool change command comes up in the middle of a job, Mach stops the machine and spindle, I move the spindle to the tool change location and then after I have changed the tool I click cycle start. Mach begins to move the machine at a death slow pace until it gets back to where the G code called for a tool change. At that point it goes back to normal cutting speed. What is happening in Mach causing it to take forever to get back to the tool change position and what can I do change that behavior?

Thanks,
Scott

[ger21]

Is your g-code using a slow feedrate before the tool change?

[chuck5121]

First thing I would check is your code G00 rapid instead of G01 for feed rate. next check your rapid over ride on your control pannel to make sure its on 100%. Good luck

[fizzissist]

Qwik workaround....Until you figure out what's happening

Insert into your program a line right after each toolchange that has the tool moving at some nominal G1 feed rate to a point maybe .1" away from the tool change location, then G0 to what would be your normal starting point after that toolchange.

That way, the control is happy, you're happy.

[ger21]

Originally Posted by fizzissist Qwik workaround....Until you figure out what's happening Insert into your program a line right after each toolchange that has the tool moving at some nominal G1 feed rate to a point maybe .1" away from the tool change location, then G0 to what would be your normal starting point after that toolchange. That way, the control is happy, you're happy.

I think you'd need to do that before the tool change. What Mach3 is doing, is moving back to the position it was in before the tool change.

[ger21]

I just looked at the M6 macro, and depending on your SafeZ setting, it will do a G1 move back to where it was. So I still think it's your feedrate prior to the toolchange.

[ssutton]

Ok More info,
I have configured Mach to go to a tool change location on my table. When the G code encounters a tool change Mach will rapid my machine to the pre-defined location, so far so good, then after I change the tool and click cycle start my machine will advance at a rate of 1 IPM until that machine returns to the location that it was at when the tool change line came up. After that (forever) it goes back to full cutting speed and all is normal.

I am using SheetCam and have included a small test G code.

[ger21]

You have an F1 before the first tool change, giving you 1ipm.

[ssutton]

Great!
Now dumb question? Where did it come from in Sheetcam and how do I get rid of it or change it to the proper setting???????????

Thanks Ger21!

[ger21]

I don't use SheetCAM, but it's probably in the post

[ssutton]

I edited the F1 out of the G code and rerun the file in Mach, all is well. I can use this as a work-around until I can get Less at SheetCam to take a look at it for me. All in all, I am very happy with SheetCam and I built my machine from the ground up to operate as a router and a plasma machine so SheetCam was a natural choice for me as it will run both operations.

Thanks again Gerry,

Scott