Rotary axis positioning works fine but axis sub doesn't.....

[SledGeek]

Hi Guys,

 

I'm making a few simple cams and can't figure out out why the axis positioning backplots, verifies, and cuts fine. But a countour with axis sub backplots and verifies correctly , but doesn't cut right.

On the machine the a axis seems to rotate to the correct starting point but then rotates the opposite way to cut. What would make the positioning work right but the sub not work ? I have just received the multi axis and am starting the journey...... what am I forgetting or doing wrong?? I guess I assume my settings are correct since the positioning works.

 

Uploaded to X8 FTP-   TE225-2-49R

 

 

Thanks

[Dan@home]

Would like to help but don't remember how to get to that suite or password ext. Probably would get more responses if it were attached.

[jlw™]

I had the same thing on a vortex. Had to go back to postability for post fix.

[SledGeek]

Would like to help but don't remember how to get to that suite or password ext. Probably would get more responses if it were attached.

 

 

Mastercam forum->Go to bottom  in X8 folder   If you look at Clearance toolpath group.The last two are  axis substition cuts.They are clearance cuts and I can 3d cut in if necessary, but this is buggin the crap out of me!  :laughing:The rest of it is all axis positionining and works fine at the machine.

 

ftp://mastercam:[email protected]/

 

 

Even though this is just a an axis sub on 4th axis, should I be using a multi axis post instead of mpmaster on 4x mill VMC .mmd?

Edited July 13, 2015 by SledGeek

[crazy^millman]

This should be a mutli-axis toolpath. What you are trying to do with Axis sub is my opinion the wrong way to go about this. I would look at getting a hold of your dealer and having them help you sort this out. I would approach this part in a totally different way then what you are currently thinking.

 

HTH

[mkd]

axis substitution has this major bug. without looking at your file, just reading you issue, I've run into the exact same thing.

 

my fix was to break contours into small segments so MC can't get confused as to direction.

 

as long as this toolpath has been around you'd think it would work. i reported this as a bug in 2010.

[SledGeek]

Ok, thanks guys. I will try this mkd and also investigate different toolpaths . Maybe I'll get lucky until I figure this stuff out

[mkd]

you can turn off your unroll tolerance

 

( T15 | 0.49 FLAT ENDMILL | H15 )
N100 G20
N102 G0 G17 G40 G49 G80 G90
N104 T15 M6
N106 G0 G90 G54 X.87 Y0. A60.904 S3056 M3
N108 G43 H15 Z1.925
N110 Z1.275
N112 G1 Z.525 F5.
N114 A60.12 F2000.
N116 A59.206
N118 A58.183
N120 A57.054
N122 A55.819
N124 A54.481
N126 A53.043
N128 A51.507
N130 A49.877
N132 A48.155
N134 A46.344
N136 A44.448
N138 A42.47
N140 A40.413
N142 A38.283
N144 A36.082
N146 A33.814
N148 A31.484
N150 A29.096
N152 A26.655
N154 A24.165
N156 A21.63
N158 A19.055
N160 A16.445
N162 A13.805
N164 A11.14
N166 A8.454
N168 A5.752
N170 A3.04
N172 A.322
N174 A-2.396
N176 A-5.11
N178 A-7.815
N180 A-10.505
N182 A-13.176
N184 A-15.822
N186 A-18.44
N188 A-21.023
N190 A-23.568
N192 A-26.069
N194 A-28.523
N196 A-30.923
N198 A-33.267
N200 A-35.55
N202 A-37.767
N204 A-39.915
N206 A-41.989
N208 A-43.986
N210 A-45.902
N212 A-47.734
N214 A-49.477
N216 A-51.13
N218 A-52.688
N220 A-54.149
N222 A-55.511
N224 A-56.77
N226 A-57.925
N228 A-58.974
N230 A-59.913
N232 A-60.743
N234 A-61.46
N236 A-62.065
N238 A-62.555
N240 A-62.93
N242 A-63.189
N244 A-63.332
N246 A-63.358
N248 G0 Z1.925
N250 M5
N252 G91 G28 Z0.
N254 G28 X0. Y0. A0.
N256 M30
 

verses

 

( T15 | 0.49 FLAT ENDMILL | H15 )
N100 G20
N102 G0 G17 G40 G49 G80 G90
N104 T15 M6
N106 G0 G90 G54 X.87 Y0. A106.011 S3056 M3
N108 G43 H15 Z1.925
N110 Z1.275
N112 G1 Z.57 F5.
N114 A-130.014 F2000.
N116 G0 Z1.925
N118 M5
N120 G91 G28 Z0.
N122 G28 X0. Y0. A0.
N124 M30

[SledGeek]

Big difference with unroll unchecked ! In looking at this again, I can get it to cut around that boss, but this really isn't a axis substitution toolpath. When viewing from the side, I realize that it would have to be a full 4 axis  as the y needs to make a linear move at the same time the 4th is turning until it gets back to c'line at which point it can rotate. I would love to figure this out in one cut, but I beleive I will need to do two for now, and blend them.

 

Make sense?

[mkd]

well in that case Crazy^ was right.

no surprise.

 

try 4 axis curve with axis controlled by tilt lines

[SledGeek]

Heh, probably. But at this point , I'm just guessing and thinking out loud.   I will try the tilt, thnx This the first toolpath I am trying with multi.

Since I just got the multi axis, I'm more like a kid in a candy store that can't figure out why licorice won't fit in my mouth just cuz there's 10 tootsie rolls there already.