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Author Topic: Rectangular Pockets have curved ends  (Read 1701 times)

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Offline PaulWC

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Rectangular Pockets have curved ends
« on: June 14, 2013, 02:05:34 AM »
While trying to troubleshoot a gaining/losing step problem, I developed a test block code, hoping to help identify the problem... to be subject of another thread.

The current issue is the actual run produces odd curved ends on what should be rectangular ended slots. I thought it was a result of Constant Velocity, so changed to Exact Stops, and the problem got worse.

The cutter is a 4FL 1/4" carbide ball mill held in an ER11 on-size fractional collet, running at 19000 rpm, 175 ipm, 0.3125" depth per pass,in soft fir... so deflection shouldn't be a factor.

The attached pics show the run result, TurboCAD/CAM path and simulation, and CutViewer simulation. I also checked the code, and it defines rectangular paths.

Dial indicator check shows no backlash. Mach3 ver .066.

Any suggestions?

Offline PaulWC

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Re: Rectangular Pockets have curved ends
« Reply #1 on: June 14, 2013, 02:09:08 AM »
And here's the xml...
Re: Rectangular Pockets have curved ends
« Reply #2 on: June 14, 2013, 06:33:53 PM »
I have had the same problem with my CRP-4948. Ahren over at CNC Router parts suggested it was the CV settings. I haven't had a chance to investigate further. One thing I noticed was if I drop the feed rate down that the problem went away. You might try that.

-Freeman

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Offline PaulWC

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Re: Rectangular Pockets have curved ends
« Reply #3 on: June 14, 2013, 08:31:10 PM »
Just checked my code, and TurboCAD/CAM had inserted a G64 line. I've changed it to G61, and will see what happens next run.

Thanks, Paul