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Topics - ckovacs

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General Mach Discussion / Problem converting from LinuxCNC to Mach3.
« on: October 07, 2014, 11:00:39 PM »
First off, this is not going to turn into a this or that session between Linux/Windows/Mach3/LinuxCNC. I am very accomplished Linux System Architect but I just decided i didn't have time to spend becoming a LinuxCNC expert. That is all on that subject, now on to the regularly scheduled program...

I recently purchased Mach3 which I must say i am very impressed with and I can already see it's going to allow me to be MUCH more productive.

My problem is that when I try to do tasks like I used to, in the case cutting 0.75" slots to lock a piece of 0.75" MDF into, the cut is undersized to the tune of about 0.040". This worked perfectly for me on the old system top the point where if I cut a 0.75 slot then a chunk of 0.75 MDF fir nice and snug.

I am using BobCad/Cam for code generation which I did changed the post processor for. The code looks reasonable enough with everything on expected increments for the part (everything is on 1/8 to 1/4 inch increments and the cooridinates reflect that.

I have run the X-Axis calibration tool for steps per inch and it comes out spot on for a 15" travel. The resultant slot./pocket ends up being 0.7010 "ish" instead of 0.75. The bit I am using (same bit as was used under LinuxCNC) is in fact 0.249". I can run the code time and time again on the same stock and get the same results. I've even reslected all of the geometry under BC/CAM and regenerated the tool paths to no avail.

I have also upped the step pulse to'5us as suggested in another thread for g540 controllers.

Any suggestions?

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