Machsupport Forum
Mach Discussion => General Mach Discussion => Topic started by: ronthomp on June 17, 2017, 09:22:08 PM

I'm trying to make a pulley for the Taig spindle to match the Consew motor. I am using Fusion 360 to model and generate the Gcode. I am doing the work on my CNC knee mill running Mach3. I loaded Mach3 turn and am using the X and Z with the lathe tool sticking out the side of the vise. Had to reverse the axis direction on the Z to emulate a lathe. The problem comes when I post to the Mach 3 turn post processor. No matter if I pick radius or diameter, the x moves are off the part. I am turning a stub arbor .625 diameter to mount the pulley blank. Stock is .75 diameter. The final X cut should be at .3125 because Z zero is the centerline of the part. Minimum X in the code is .625 regardless of whether I choose radius or diameter. I tried changing Mach to diameter mode and it made it worse. Is there any way to force the post into radius mode? I am also posting this on the Fusion forum.

If memory is correct I think the default for the mach 3 turning CPS file is radius.
Not sure how your going about using Fusion 360, but I would suggest you use the lathe module ie; sketch the part in the correct quadrant for the tool post to be used ,do a revolve to create the solid, set things up correctly in CAM, and define the tool properly.
Simulate to confirm that pathing is appropriate.
May be wrong, but in general, sketch /cam/ post in radius and configure mach appropriately and all should be good.
BTW, attached file should help for defining the lathe tool insert in Fusion.
Have fun,
RICH

Here is a link to the fusion file. It simulates properly. Thanks!
https://l.facebook.com/l.php?u=http%3A%2F%2Fa360.co%2F2sKPvao&h=ATMK3zNIyUCRZnpmy_US6jEOPPkMCJAYHPdQo883CMd551jU4mDnDS_4J4tecyPxJovqgi0lsyao5B30XW__KmEjItTj1HLylhDGLlWQ2A62bUqNlaHUsq4x5Ind2pZWo_MvE

OK, I read your post about proper work flow, and the only thing different was how the model was created. I redid it using a revolve, redid the cam using the new model, and it still posts the same way. Line N93, below, shows the final X dimension as .625" which is the diameter of the finished face. I think this should be the radius, .3125".
%
(1001)
N10 G90 G94 G18
N11 G20
N12 G91 G28 X0.
N13 G90
(FACE1 2)
N14 T0404
N15 G54
N16 M8
N17 G94
N18 G97 S500 M3
N19 G0 X1.55 Z0.1969
N20 G0 Z0.0566
N21 G1 X0.8631 F10.
N22 X0.75 Z0.
N23 X0.0312
N24 X0.0819 Z0.0566
N25 G0 X1.55
N26 Z0.1969
(PROFILE5 2)
N27 G94
N28 G97 S500 M3
N29 G0 X1.55 Z0.1969
N30 Z0.0551
N31 X0.8463
N32 G1 X0.8431 F10.
N33 X0.73 Z0.0015
N34 Z0.7597
N35 G18 G3 X0.7492 Z0.7729 I0.0356 K0.036
N36 G1 X0.8624 Z0.8295
N37 G0 Z0.0562
N38 X0.8231
N39 G1 X0.71 Z0.0004 F10.
N40 Z0.752
N41 G3 X0.74 Z0.7654 I0.0256 K0.0437
N42 G1 X0.8531 Z0.822
N43 G0 Z0.0562
N44 X0.8031
N45 G1 X0.69 Z0.0004 F10.
N46 Z0.7475
N47 G3 X0.72 Z0.7553 I0.0156 K0.0482
N48 G1 X0.8331 Z0.6987
N49 G0 Z0.0562
N50 X0.7831
N51 G1 X0.67 Z0.0004 F10.
N52 Z0.7453
N53 G3 X0.7 Z0.7494 I0.0056 K0.0503
N54 G1 X0.8131 Z0.6928
N55 G0 Z0.0562
N56 X0.7631
N57 G1 X0.65 Z0.0004 F10.
N58 Z0.745
N59 X0.6587
N60 G3 X0.68 Z0.7461 K0.0506
N61 G1 X0.7931 Z0.6896
N62 G0 Z0.0562
N63 X0.7431
N64 G1 X0.63 Z0.0004 F10.
N65 Z0.0299
N66 G3 X0.635 Z0.0456 I0.0481 K0.0157
N67 G1 Z0.745
N68 X0.6587
N69 G3 X0.66 K0.0506
N70 G1 X0.7731 Z0.6884
N71 G0 Z0.0562
N72 X0.7231
N73 G1 X0.61 Z0.0004 F10.
N74 Z0.0123
N75 G3 X0.635 Z0.0456 I0.0381 K0.0333
N76 G1 X0.7481 Z0.1022
N77 G0 Z0.0562
N78 X0.7069
N79 G1 X0.5938 Z0.0004 F10.
N80 Z0.0049
N81 G3 X0.62 Z0.0191 I0.03 K0.0408
N82 G1 X0.7331 Z0.0757
N83 G0 Z0.0562
N84 X0.6974
N85 G1 X0.6924 F10.
N86 X0.5792 Z0.0004
N87 G3 X0.6038 Z0.0091 I0.0227 K0.0452
N88 G1 X0.7169 Z0.0475
N89 G0 Z0.0562
N90 X0.6808
N91 G1 X0.6587 F10.
N92 X0.5456 Z0.0004
N93 G3 X0.625 Z0.0456 I0.0059 K0.0452
N94 G1 Z0.75
N95 X0.6587
N96 G3 X0.7492 Z0.7897 K0.0456
N97 G1 X0.8624 Z0.8463
N98 X0.8739
N99 G0 X1.55
N100 Z0.1969
N101 M9
N102 G91 G28 X0. Z0.
N103 G90
N104 M30
%

The lathe code as backplotted shows the pathing  see pic. The radius of the piece is .3126 ( close enough ).
Note the setup required in Mach3 lathe to run the code properly. Just run the code and note the X axis position as it goes through the
pathing in the graphics display.
Guess my memory is not as good as it used to be! :D
RICH
BTW, Your using the mill to do lathe work and I am not up or done that.
Not sure what sceen set your using but think Calypso Ventures provides for
it in MSM.

Thanks, Rich!
I will try that the next chance I get. How do you get a dimension on the backplot?

The gcode is back plotted into CAD and I added the dimension to the drawing.
RICH

Ah, thanks.

Finally got to try this and it worked like a champ. Thanks!