3 axis simultaneously with 4th

[Stebedeff]

Hello to all,

I'am having some trouble with my posted program. I'am doing some 4th rotary toolpath with a full radius mill on 4 sides. On TOP and FRONT no problem.
But on BOTTOM and BACK I'am getting some lines with 4 axis simultaneous moves. My control "Fanuc OM-C" only supports 3! How can I fix this? I've looked a around in post and CD but can't find anything.
Please need some help.

Thanks

[HuFlungDung]

Can you post a sketch of the part and or the toolpath? I'm having trouble visualizing why such a move would be needed except as a positioning movement. If it is a rapid move, perhaps your post can be adjusted to put the rotary's rapid positioning movement on a line by itself.

[tstom]

Here is a sample of the code from my post for the file I sent you. The post is a modified Generic Fanuc 5x post What post are you using?
Does yours resemble this ? You say your control only supports 3 Is your 4th axis an indexer or a full simultaneous 4th axis?

:0001 ( PROGRAM - ROTARY_SQUARE )
( DATE - 15-01-09 TIME - 13:07 )
G20
G0 G17 G40 G80 G90 G94 G98
( 1/4 BULL ENDMILL 0.0625 RAD TOOL - 267 DIA. OFF. - 0 LEN. - 0 DIA. - .25 )
T267 M6
G0 G54 G90 X0. Y-.75 A-90. B0. S2139 M3
G43 H0 Z3. M8
Z1.1
G1 Z1. F8.56
Y.75
Y.6904 Z1.0538 A-94.282
Y.6307 Z1.1011 A-98.376
Y.5708 Z1.1425 A-102.329
Y.5102 Z1.1789 A-106.188
Y.4483 Z1.2108 A-110.
Y.3844 Z1.2385 A-113.812
Y.3177 Z1.2622 A-117.671
Y.2474 Z1.2817 A-121.624
Y.1726 Z1.2967 A-125.718
Y.0924 Z1.3066 A-130.
Y.0118 Z1.3105 A-134.282
Y-.0645 Z1.3086 A-138.376
Y-.1371 Z1.3017 A-142.329
Y-.2068 Z1.2901 A-146.188
Y-.2745 Z1.2741 A-150.
Y-.341 Z1.2536 A-153.812
Y-.4071 Z1.2284 A-157.671
Y-.4733 Z1.198 A-161.624
Y-.5403 Z1.1618 A-165.718
Y-.6084 Z1.1188 A-170.
Y-.658 Z1.0819 A-173.338
Y-.705 Z1.0424 A-176.662
Y-.75 Z1. A-180.
Y.75
Y.6904 Z1.0538 A-184.282
Y.6307 Z1.1011 A-188.376
Y.5708 Z1.1425 A-192.329
Y.5102 Z1.1789 A-196.188
Y.4483 Z1.2108 A-200.
Y.3844 Z1.2385 A-203.812
Y.3177 Z1.2622 A-207.671
Y.2474 Z1.2817 A-211.624
Y.1726 Z1.2967 A-215.718
Y.0924 Z1.3066 A-220.
Y.0118 Z1.3105 A-224.282
Y-.0645 Z1.3086 A-228.376
Y-.1371 Z1.3017 A-232.329
Y-.2068 Z1.2901 A-236.188
Y-.2745 Z1.2741 A-240.
Y-.341 Z1.2536 A-243.812
Y-.4071 Z1.2284 A-247.671
Y-.4733 Z1.198 A-251.624
Y-.5403 Z1.1618 A-255.718
Y-.6084 Z1.1188 A-260.
Y-.658 Z1.0819 A-263.338
Y-.705 Z1.0424 A-266.662
Y-.75 Z1. A-270.
Y.75
Y.6904 Z1.0538 A-274.282
Y.6307 Z1.1011 A-278.376
Y.5708 Z1.1425 A-282.329
Y.5102 Z1.1789 A-286.188
Y.4483 Z1.2108 A-290.
Y.3844 Z1.2385 A-293.812
Y.3177 Z1.2622 A-297.671
Y.2474 Z1.2817 A-301.624
Y.1726 Z1.2967 A-305.718
Y.0924 Z1.3066 A-310.
Y.0118 Z1.3105 A-314.282
Y-.0645 Z1.3086 A-318.376
Y-.1371 Z1.3017 A-322.329
Y-.2068 Z1.2901 A-326.188
Y-.2745 Z1.2741 A-330.
Y-.341 Z1.2536 A-333.812
Y-.4071 Z1.2284 A-337.671
Y-.4733 Z1.198 A-341.624
Y-.5403 Z1.1618 A-345.718
Y-.6084 Z1.1188 A-350.
Y-.658 Z1.0819 A-353.338
Y-.705 Z1.0424 A-356.662
Y-.75 Z1. A-360.
Y.75

[Stebedeff]

Thanks for the replies!
I had the cut tolerence on 0.005 mm. When changed to 0.01mm the problem was solved. Just don't realy understand why top and front where good and bottom and back not. What is cut tolerence anyways. Is that how exact the mill will follow the contour from the drawing?
tstom your file did the job! Very grateful. Was trying the mutiaxis curves instead of flowline.
Still new to the multiaxis part.
The problem was on a different part.

[Mike Mattera]

"What is cut tolerence anyways. Is that how exact the mill will follow the contour from the drawing?"

Yes that's it exactly. Smaller isn't always better.

Mike Mattera

[tstom]

Glad it worked out for you If there is one thing I've learned (and I've got plenty to learn)about Mastercam it's that if one toolpath doesn't do what you want there is probably another one that will