2 1/2 axis roughing hangs forever.

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2 1/2 axis roughing hangs forever.

Postby 1350519287 » Sat Mar 14, 2020 6:33 pm

I need to use window's task manager to stop the attempt at 2 1/2 axis roughing. Aside from the point that one should never ever have to use the OS to kill an errant program what exactly is wrong with this drawing that the roughing fails?

I've attached a zip of the drawing. The 3D horizontal finishing with a 3 degree draft works perfectly.

I've tried this on two different WIN-7 systems. In both cases I have to kill the Alibre Design.exe task. On one I did let it churn away for 2 hours.

Thanks
John
Attachments
MillTopPlatePattern.zip
(57.73 KiB) Downloaded 18 times
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Re: 2 1/2 axis roughing hangs forever.

Postby nick952 » Sun Mar 15, 2020 9:15 am

Try the attached file.
Your file generated OK on my W10 laptop, but didn't seem to make sense. I've added a containment region that covers the two fillets and now get a sensible (to me) tool path.

Nick.
Attachments
MillTopPlatePattern2.zip
(83.37 KiB) Downloaded 17 times
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Re: 2 1/2 axis roughing hangs forever.

Postby 1350519287 » Sun Mar 15, 2020 9:48 am

Thanks. I see that containment region has to be on the same plane as the top surface. Set it even with milled surface or the XY plane and the generated code mills the entire surface. Following your suggestion I suppressed the two fillets and drew that same containment region matching the extrusion sketch for the raised part.

I keep forgetting that although Alibre provides clear information with the two areas as to what I want milled, the cam software is too stupid to recognize those as bounding areas. And regardless of WIN-10 or WIN-7, as my computing science professor said in our compiler writing class, never ever rely on the OS to catch errors (or not in this case). The software clearly runs into an infinite loop in some form with this drawing.

In fact lately I make sure before I generate that I save the drawing. Way too many times I've had to kill AlibreCAM in order to stop the infinite loops. Hopefully Mecsoft will spend some time solving bugs rather than coming out with new features. My original drawing should give a clue as to why it goes nuts.
1350519287
 
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Re: 2 1/2 axis roughing hangs forever.

Postby 1350519287 » Sun Mar 15, 2020 10:20 am

Something else really odd here and perhaps a clue as to why I'm having so many problems. When I regenerate your copy I see the toolpathworked.jpg dialog box while it's calculating. When I have the crash I see the toolpathfailure.jpg dialog.

Both AlibreCAD and AlibreCAM claim they are up to date.

So why does the 'repaired' drawing show a totally different dialog box.
Attachments
ToolpathFailure.jpg
Infinite loop dialog
ToolpathFailure.jpg (17.85 KiB) Viewed 712 times
ToolpathWorked.jpg
Dialog with updated drawing
ToolpathWorked.jpg (45.62 KiB) Viewed 712 times
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Re: 2 1/2 axis roughing hangs forever.

Postby nick952 » Sun Mar 15, 2020 11:18 am

I have AlbreCAM set to use Multiple Cores (threads) when calculating the tool path and that is what you see as the larger dialogue box
Attachments
Annotation 2020-03-15 181210.jpg
Annotation 2020-03-15 181210.jpg (93.97 KiB) Viewed 711 times
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Re: 2 1/2 axis roughing hangs forever.

Postby 1350519287 » Sun Mar 15, 2020 12:41 pm

Thanks. Once I did that I was not longer able to make it go away forever. No matter what I did. I went back to the old drawing. No difference. So something in the code that enables/disables the multiple tool paths cleans up something. Setting it back without the box checked also no longer breaks it. In other words I can no longer reproduce the error.
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