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Topics - Sully

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General Mach Discussion / Mill Not Cutting Like Shown in Simulations
« on: November 10, 2014, 09:35:36 PM »
Hello all!   [I originally posted this mistakenly to the Mach4 area]
I built an Ox CNC machine controlled with Probotix PBX-RF Isolated Breakout Board and Mach3.  Nema23 motors 2 on Y, 1 on X and 1 on Z.
I run the simulations in both Autodesk Inventor 2015 and Mach3 and the tool path is followed correctly.  When I run a test cut (using whiteboard material, with very little load on the machine) the drill portions runs fine, but when it begins cutting circles in the material it will start correctly, them 2/3 through the circle it cuts across the middle.  I searched the forum earlier today and found a post that had optimized settings for Win XP, so I followed the suggestions on stopping all processes except those needed by OS to run Mach3.

After optimizing and restarting XP, I ran the same G Code file and it ran a bit faster, but when it started the first circle it "stair stepped" about and inch, then began a circle... it was off by the distance of the stair step portion.

I am in the shop writing this and wanted to at least get a thread started.  I have images and uploaded YouTube video to show the behavior.  I really would like to get to the bottom of this as I have a project that needs to be completed (doesn't everybody???).

I appreciate any insight and yes, I have a licensed copy of Mach3.  Thanks again for any help and I will provide any files that can be used to narrow this issue down.  I will post images shortly.

Info:
Mach3 Version R3.043.066

Dell E7300 2.66Ghz Intel Core Duo CPU
2GB Ram
Windows XP Pro SP3

The PC runs very well and is not a bottom of the barrel PC.  No driver issues.

Sully

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