Multiaxis ? - Getting Y movements that I don't feel I should be getting

[huskermcdoogle]

Been a while since I have posted.  Been tinkering in the background with some multiaxis stuff.  Many questions.... Many questions.....  But I have an aggravating one that I need to ask the masters about.

 

I am surfacing using Z and A and feeding along X creating a freeform spiral with our 6 axis router XYZ BC with a rotary along to make freeform round ish parts.  Think surfaced wood sticks that are bolted to metal and go boom.  I have been using the MSurf Toolpath for this for a long time and it has worked pretty well, but....  Sometimes (and I can't to put a finger on why) it will output small changes in Y that cause the machine to slow down due to acceleration issues.  When Y moves aren't present, the thing just plain flies.  See attached code.  Anyone have any ideas on how to truly eliminate y movement in this case.

 

I am using pattern surface cylinder for the tool axis control.  I have tried using the axis origin and outputting as 4 axis, still no different. I have tried different cutter sizes no diff.  Still has small Y movements.  

 

Anyway, I am open to anything at this point.

 

sample code attached

 

I am willing to send a file direct, just not willing to post on the forum.

 

Thanks,

 

Husker

X112.6 Z22.348 A242.443
X112.636 Y.001 Z22.482 A246.895
X112.673 Y0. Z22.594 A251.289
X112.709 Y-.002 Z22.686 A255.625
X112.743 Y0. Z22.731 A259.557
X112.777 Z22.762 A263.423
X112.811 Z22.77 A267.226
X112.845 Z22.765 A270.925
X112.887 Y-.001 Z22.736 A275.626
X112.921 Y0. Z22.672 A279.46
X112.955 Z22.597 A283.393
X112.992 Y-.002 Z22.504 A287.843
X113.029 Y-.001 Z22.364 A292.217
X113.065 Y.004 Z22.222 A296.655
X113.094 Y-.001 Z22.093 A300.268
X113.123 Y.003 Z22.024 A303.889
X113.167 Y.005 Z21.963 A309.373
X113.203 Y.006 Z21.942 A313.968
X113.232 Y.008 Z21.972 A317.639
X113.261 Y.007 Z22.04 A321.314
X113.305 Y.01 Z22.194 A326.79
X113.341 Y.013 Z22.338 A331.311
X113.385 Z22.554 A336.674
X113.421 Y.007 Z22.747 A341.088
X113.45 Y.014 Z22.897 A344.533
X113.489 Z23.105 A349.066
X113.523 Y.008 Z23.276 A352.967
X113.574 Z23.538 A358.62
X113.624 Z23.81 A4.181
X113.675 Z24.158 A9.935
X113.733 Y.019 Z24.82 A16.749
X113.784 Y.024 Z25.774 A22.875
X113.828 Y.007 Z26.865 A28.226
X113.857 Y.048 Z27.733 A31.852
X113.893 Y.044 Z28.871 A36.4
X113.922 Y.029 Z29.832 A40.065
X113.951 Y.051 Z30.789 A43.736
X113.988 Y.026 Z31.932 A48.329

[David Colin]

If you are using ModuleWorks multiaxis module, there are 2 fields to input Y limits in toolpath options, you could try to put in 0/0.

If that doesn t work we ll need a file to investigate

[huskermcdoogle]

I am using the classic mastercam paths.  I haven't figured out how to get the same spiral output with the Moduleworks Paths.  Tried many times. If I could figure out how to use a pattern surface in the Moduleworks paths it would be a slam dunk.

[David Colin]

I am not in my office yet but I am pretty sure to have use a pattern surface with a moduleworks toolpath...I ll look into it later this morning.

 

Edit: I looked into but the part i was thinking is programmed with a classic toolpath too... However, i guess you should be able to make your toolpath with ModuleWorks toolpaths using 'surface(pattern)' as toolaxis control and playing with collision control to compensate on your part surfaces. If you could share a file we could look better what you're looking for.

[huskermcdoogle]

Using collision control, brilliant oh duh moment.....  I'll try that tonight.  Maybe I can post something up, just need to scrub the file a little.  I made the solid, its our property, so it shouldn't be a big deal.

[David Colin]

If you don t want to post your solid, create some surfaces from it (the ones needed for your toolpath only)