Pocket is greatly undersized when machined.

[ANDERSONRODANDCHOPPER]

Hello,

I have a fixture plate I am trying to machine and am having trouble reaching the desired pocket dimension during the machining process.  I am .15 too small  in X and Y.  Or basically .075 on all 4 edges.   If I was off by .0015 on all 4 sides I would chalk it up as my lil POS mini mill but I"m way off here.   I tried a 5/8 end mill and was even proportionality further off.  It feels as if I have  something setup wrong?? in MACH 3 or in my CAM.   

File and photo are attached.

Some background info:

I have a mini mill running on Mach 3.

1/2 Lakeshore carbide 2 flute flat end mill in an R8 collet holder.

Running at 30in/min 2500rpm .025 depth of cut.  Runs smoothly without chatter and does not feel as if its laboring. Feels good.

Thank you in advance for any help regarding this matter.

Thank you,

Josh

[LibertyMachine]

Did you use the Mach3 post processor to generate the code? Could you attach the code in your next reply? Unfortunately, I don't find anything jumping out at me with the Fusion file. Also, could you please state the desired width and length of the pocket? I can get that data from the model, I just want to make sure both are "on the same page" so to speak

[ANDERSONRODANDCHOPPER]

I used the fusion 360 post processor.  File attached.

The stock that wiil be placed in the fixture is 5.035" X and 4.035 Y and .25 Z.   I set up my model in fusion for that exact x and y dimension with a .15 deep pocket.   What I end up with is:

4.885 X and 3.884 in Y.   I stopped the program before it finished so I dont know the Z.

( FIXTURE PLATE TEST ADAPTIVE)
(T1 D=0.5 CR=0. - ZMIN=-0.15 - FLAT END MILL)
G90 G94 G91.1 G40 G49 G17
G20
G28 G91 Z0.
G90

(2D POCKET1)
M5
M9
T1 M6
S2500 M3
G54
M9
G0 X-0.5481 Y-0.3397
G43 Z0.6 H1
Z0.2
G1 Z0.15 F39.4
G3 X-0.5469 Y-0.34 Z0.1391 R0.2375 F6.5
X-0.5434 Y-0.3407 Z0.1287 R0.2375
X-0.5378 Y-0.3416 Z0.1194 R0.2375
X-0.5303 Y-0.3427 Z0.1115 R0.2375
X-0.5212 Y-0.3437 Z0.1055 R0.2375
X-0.5109 Y-0.3444 Z0.1016 R0.2375
X-0.5001 Y-0.3446 Z0.1 R0.2375
Y0.1304 Z0.075 R0.2375
Y-0.3446 Z0.05 R0.2375
Y0.1304 Z0.025 R0.2375
Y-0.3446 Z0. R0.2375
Y0.1304 Z-0.025 R0.2375
G1 X-0.6178 F39.4
G3 X-0.6305 Y0.1177 R0.0126
G1 Y-0.1176
G3 X-0.6177 Y-0.1304 R0.0128
G1 X0.6287
G3 X0.6415 Y-0.1176 R0.0128
G1 Y0.1176
G3 X0.6287 Y0.1304 R0.0128
G1 X-0.5001
G2 X-0.7455 Y0.3052 R0.2596
G3 X-1.0426 Y0.2553 R0.1527
G1 Y-0.5297
G3 X-1.0298 Y-0.5425 R0.0128
G1 X1.0408
G3 X1.0536 Y-0.5297 R0.0128
G1 Y0.5297
G3 X1.0408 Y0.5425 R0.0128
G1 X-1.03
G3 X-1.0426 Y0.5299 R0.0126
G1 Y0.2553
G2 X-1.2486 Y-0.0538 R0.3348
G3 X-1.4547 Y-0.3629 R0.3348
G1 Y-0.9418
G3 X-1.4419 Y-0.9546 R0.0128
G1 X1.4529
G3 X1.4657 Y-0.9418 R0.0128
G1 Y0.9418
G3 X1.4529 Y0.9546 R0.0128
G1 X-1.4421
G3 X-1.4547 Y0.942 R0.0126
G1 Y-0.3629
G2 X-1.6607 Y-0.6719 R0.3348
G3 X-1.8668 Y-0.981 R0.3348
G1 Y-1.3539
G3 X-1.854 Y-1.3667 R0.0128
G1 X1.865
G3 X1.8778 Y-1.3539 R0.0128
G1 Y1.3539
G3 X1.865 Y1.3667 R0.0128
G1 X-1.8542
G3 X-1.8668 Y1.3541 R0.0126
G1 Y-0.981
G2 X-2.0509 Y-1.3151 R0.3952
G3 X-2.3389 Y-1.5652 R1.2616
G2 X-2.5247 Y-1.668 R0.3
G3 X-2.5176 Y-1.7675 R0.05
G1 X2.531
G3 X2.5378 Y-1.668 R0.05
G2 X2.2786 Y-1.3707 R0.3
G1 Y1.3711
G2 X2.5357 Y1.668 R0.3
G3 X2.5286 Y1.7675 R0.05
G1 X-2.5176
G3 X-2.5225 Y1.6677 R0.05
G2 X-2.4426 Y1.6462 R0.25
X-2.2676 Y1.3735 R0.3
G1 Y-1.3711
G2 X-2.3389 Y-1.5652 R0.3
G1 X-2.2665 Y-1.6267 Z-0.0155
G0 Z0.2
X-0.5481 Y-0.3397
G1 Z0.125 F39.4
G3 X-0.5469 Y-0.34 Z0.1141 R0.2375 F6.5
X-0.5434 Y-0.3407 Z0.1037 R0.2375
X-0.5378 Y-0.3416 Z0.0944 R0.2375
X-0.5303 Y-0.3427 Z0.0865 R0.2375
X-0.5212 Y-0.3437 Z0.0805 R0.2375
X-0.5109 Y-0.3444 Z0.0766 R0.2375
X-0.5001 Y-0.3446 Z0.075 R0.2375
Y0.1304 Z0.05 R0.2375
Y-0.3446 Z0.025 R0.2375
Y0.1304 Z0. R0.2375
Y-0.3446 Z-0.025 R0.2375
Y0.1304 Z-0.05 R0.2375
G1 X-0.6178 F39.4
G3 X-0.6305 Y0.1177 R0.0126
G1 Y-0.1176
G3 X-0.6177 Y-0.1304 R0.0128
G1 X0.6287
G3 X0.6415 Y-0.1176 R0.0128
G1 Y0.1176
G3 X0.6287 Y0.1304 R0.0128
G1 X-0.5001
G2 X-0.7455 Y0.3052 R0.2596
G3 X-1.0426 Y0.2553 R0.1527
G1 Y-0.5297
G3 X-1.0298 Y-0.5425 R0.0128
G1 X1.0408
G3 X1.0536 Y-0.5297 R0.0128
G1 Y0.5297
G3 X1.0408 Y0.5425 R0.0128
G1 X-1.03
G3 X-1.0426 Y0.5299 R0.0126
G1 Y0.2553
G2 X-1.2486 Y-0.0538 R0.3348
G3 X-1.4547 Y-0.3629 R0.3348
G1 Y-0.9418
G3 X-1.4419 Y-0.9546 R0.0128
G1 X1.4529
G3 X1.4657 Y-0.9418 R0.0128
G1 Y0.9418
G3 X1.4529 Y0.9546 R0.0128
G1 X-1.4421
G3 X-1.4547 Y0.942 R0.0126
G1 Y-0.3629
G2 X-1.6607 Y-0.6719 R0.3348
G3 X-1.8668 Y-0.981 R0.3348
G1 Y-1.3539
G3 X-1.854 Y-1.3667 R0.0128
G1 X1.865
G3 X1.8778 Y-1.3539 R0.0128
G1 Y1.3539
G3 X1.865 Y1.3667 R0.0128
G1 X-1.8542
G3 X-1.8668 Y1.3541 R0.0126
G1 Y-0.981
G2 X-2.0509 Y-1.3151 R0.3952
G3 X-2.3389 Y-1.5652 R1.2616
G2 X-2.5247 Y-1.668 R0.3
G3 X-2.5176 Y-1.7675 R0.05
G1 X2.531
G3 X2.5378 Y-1.668 R0.05
G2 X2.2786 Y-1.3707 R0.3
G1 Y1.3711
G2 X2.5357 Y1.668 R0.3
G3 X2.5286 Y1.7675 R0.05
G1 X-2.5176
G3 X-2.5225 Y1.6677 R0.05
G2 X-2.4426 Y1.6462 R0.25
X-2.2676 Y1.3735 R0.3
G1 Y-1.3711
G2 X-2.3389 Y-1.5652 R0.3
G1 X-2.2665 Y-1.6267 Z-0.0405
G0 Z0.2
X-0.5481 Y-0.3397
G1 Z0.1 F39.4
G3 X-0.5469 Y-0.34 Z0.0891 R0.2375 F6.5
X-0.5434 Y-0.3407 Z0.0787 R0.2375
X-0.5378 Y-0.3416 Z0.0694 R0.2375
X-0.5303 Y-0.3427 Z0.0615 R0.2375
X-0.5212 Y-0.3437 Z0.0555 R0.2375
X-0.5109 Y-0.3444 Z0.0516 R0.2375
X-0.5001 Y-0.3446 Z0.05 R0.2375
Y0.1304 Z0.025 R0.2375
Y-0.3446 Z0. R0.2375
Y0.1304 Z-0.025 R0.2375
Y-0.3446 Z-0.05 R0.2375
Y0.1304 Z-0.075 R0.2375
G1 X-0.6178 F39.4
G3 X-0.6305 Y0.1177 R0.0126
G1 Y-0.1176
G3 X-0.6177 Y-0.1304 R0.0128
G1 X0.6287
G3 X0.6415 Y-0.1176 R0.0128
G1 Y0.1176
G3 X0.6287 Y0.1304 R0.0128
G1 X-0.5001
G2 X-0.7455 Y0.3052 R0.2596
G3 X-1.0426 Y0.2553 R0.1527
G1 Y-0.5297
G3 X-1.0298 Y-0.5425 R0.0128
G1 X1.0408
G3 X1.0536 Y-0.5297 R0.0128
G1 Y0.5297
G3 X1.0408 Y0.5425 R0.0128
G1 X-1.03
G3 X-1.0426 Y0.5299 R0.0126
G1 Y0.2553
G2 X-1.2486 Y-0.0538 R0.3348
G3 X-1.4547 Y-0.3629 R0.3348
G1 Y-0.9418
G3 X-1.4419 Y-0.9546 R0.0128
G1 X1.4529
G3 X1.4657 Y-0.9418 R0.0128
G1 Y0.9418
G3 X1.4529 Y0.9546 R0.0128
G1 X-1.4421
G3 X-1.4547 Y0.942 R0.0126
G1 Y-0.3629
G2 X-1.6607 Y-0.6719 R0.3348
G3 X-1.8668 Y-0.981 R0.3348
G1 Y-1.3539
G3 X-1.854 Y-1.3667 R0.0128
G1 X1.865
G3 X1.8778 Y-1.3539 R0.0128
G1 Y1.3539
G3 X1.865 Y1.3667 R0.0128
G1 X-1.8542
G3 X-1.8668 Y1.3541 R0.0126
G1 Y-0.981
G2 X-2.0509 Y-1.3151 R0.3952
G3 X-2.3389 Y-1.5652 R1.2616
G2 X-2.5247 Y-1.668 R0.3
G3 X-2.5176 Y-1.7675 R0.05
G1 X2.531
G3 X2.5378 Y-1.668 R0.05
G2 X2.2786 Y-1.3707 R0.3
G1 Y1.3711
G2 X2.5357 Y1.668 R0.3
G3 X2.5286 Y1.7675 R0.05
G1 X-2.5176
G3 X-2.5225 Y1.6677 R0.05
G2 X-2.4426 Y1.6462 R0.25
X-2.2676 Y1.3735 R0.3
G1 Y-1.3711
G2 X-2.3389 Y-1.5652 R0.3
G1 X-2.2665 Y-1.6267 Z-0.0655
G0 Z0.2
X-0.5481 Y-0.3397
G1 Z0.075 F39.4
G3 X-0.5469 Y-0.34 Z0.0641 R0.2375 F6.5
X-0.5434 Y-0.3407 Z0.0537 R0.2375
X-0.5378 Y-0.3416 Z0.0444 R0.2375
X-0.5303 Y-0.3427 Z0.0365 R0.2375
X-0.5212 Y-0.3437 Z0.0305 R0.2375
X-0.5109 Y-0.3444 Z0.0266 R0.2375
X-0.5001 Y-0.3446 Z0.025 R0.2375
Y0.1304 Z0. R0.2375
Y-0.3446 Z-0.025 R0.2375
Y0.1304 Z-0.05 R0.2375
Y-0.3446 Z-0.075 R0.2375
Y0.1304 Z-0.1 R0.2375
G1 X-0.6178 F39.4
G3 X-0.6305 Y0.1177 R0.0126
G1 Y-0.1176
G3 X-0.6177 Y-0.1304 R0.0128
G1 X0.6287
G3 X0.6415 Y-0.1176 R0.0128
G1 Y0.1176
G3 X0.6287 Y0.1304 R0.0128
G1 X-0.5001
G2 X-0.7455 Y0.3052 R0.2596
G3 X-1.0426 Y0.2553 R0.1527
G1 Y-0.5297
G3 X-1.0298 Y-0.5425 R0.0128
G1 X1.0408
G3 X1.0536 Y-0.5297 R0.0128
G1 Y0.5297
G3 X1.0408 Y0.5425 R0.0128
G1 X-1.03
G3 X-1.0426 Y0.5299 R0.0126
G1 Y0.2553
G2 X-1.2486 Y-0.0538 R0.3348
G3 X-1.4547 Y-0.3629 R0.3348
G1 Y-0.9418
G3 X-1.4419 Y-0.9546 R0.0128
G1 X1.4529
G3 X1.4657 Y-0.9418 R0.0128
G1 Y0.9418
G3 X1.4529 Y0.9546 R0.0128
G1 X-1.4421
G3 X-1.4547 Y0.942 R0.0126
G1 Y-0.3629
G2 X-1.6607 Y-0.6719 R0.3348
G3 X-1.8668 Y-0.981 R0.3348
G1 Y-1.3539
G3 X-1.854 Y-1.3667 R0.0128
G1 X1.865
G3 X1.8778 Y-1.3539 R0.0128
G1 Y1.3539
G3 X1.865 Y1.3667 R0.0128
G1 X-1.8542
G3 X-1.8668 Y1.3541 R0.0126
G1 Y-0.981
G2 X-2.0509 Y-1.3151 R0.3952
G3 X-2.3389 Y-1.5652 R1.2616
G2 X-2.5247 Y-1.668 R0.3
G3 X-2.5176 Y-1.7675 R0.05
G1 X2.531
G3 X2.5378 Y-1.668 R0.05
G2 X2.2786 Y-1.3707 R0.3
G1 Y1.3711
G2 X2.5357 Y1.668 R0.3
G3 X2.5286 Y1.7675 R0.05
G1 X-2.5176
G3 X-2.5225 Y1.6677 R0.05
G2 X-2.4426 Y1.6462 R0.25
X-2.2676 Y1.3735 R0.3
G1 Y-1.3711
G2 X-2.3389 Y-1.5652 R0.3
G1 X-2.2665 Y-1.6267 Z-0.0905
G0 Z0.2
X-0.5481 Y-0.3397
G1 Z0.05 F39.4
G3 X-0.5469 Y-0.34 Z0.0391 R0.2375 F6.5
X-0.5434 Y-0.3407 Z0.0287 R0.2375
X-0.5378 Y-0.3416 Z0.0194 R0.2375
X-0.5303 Y-0.3427 Z0.0115 R0.2375
X-0.5212 Y-0.3437 Z0.0055 R0.2375
X-0.5109 Y-0.3444 Z0.0016 R0.2375
X-0.5001 Y-0.3446 Z0. R0.2375
Y0.1304 Z-0.025 R0.2375
Y-0.3446 Z-0.05 R0.2375
Y0.1304 Z-0.075 R0.2375
Y-0.3446 Z-0.1 R0.2375
Y0.1304 Z-0.125 R0.2375
G1 X-0.6178 F39.4
G3 X-0.6305 Y0.1177 R0.0126
G1 Y-0.1176
G3 X-0.6177 Y-0.1304 R0.0128
G1 X0.6287
G3 X0.6415 Y-0.1176 R0.0128
G1 Y0.1176
G3 X0.6287 Y0.1304 R0.0128
G1 X-0.5001
G2 X-0.7455 Y0.3052 R0.2596
G3 X-1.0426 Y0.2553 R0.1527
G1 Y-0.5297
G3 X-1.0298 Y-0.5425 R0.0128
G1 X1.0408
G3 X1.0536 Y-0.5297 R0.0128
G1 Y0.5297
G3 X1.0408 Y0.5425 R0.0128
G1 X-1.03
G3 X-1.0426 Y0.5299 R0.0126
G1 Y0.2553
G2 X-1.2486 Y-0.0538 R0.3348
G3 X-1.4547 Y-0.3629 R0.3348
G1 Y-0.9418
G3 X-1.4419 Y-0.9546 R0.0128
G1 X1.4529
G3 X1.4657 Y-0.9418 R0.0128
G1 Y0.9418
G3 X1.4529 Y0.9546 R0.0128
G1 X-1.4421
G3 X-1.4547 Y0.942 R0.0126
G1 Y-0.3629
G2 X-1.6607 Y-0.6719 R0.3348
G3 X-1.8668 Y-0.981 R0.3348
G1 Y-1.3539
G3 X-1.854 Y-1.3667 R0.0128
G1 X1.865
G3 X1.8778 Y-1.3539 R0.0128
G1 Y1.3539
G3 X1.865 Y1.3667 R0.0128
G1 X-1.8542
G3 X-1.8668 Y1.3541 R0.0126
G1 Y-0.981
G2 X-2.0509 Y-1.3151 R0.3952
G3 X-2.3389 Y-1.5652 R1.2616
G2 X-2.5247 Y-1.668 R0.3
G3 X-2.5176 Y-1.7675 R0.05
G1 X2.531
G3 X2.5378 Y-1.668 R0.05
G2 X2.2786 Y-1.3707 R0.3
G1 Y1.3711
G2 X2.5357 Y1.668 R0.3
G3 X2.5286 Y1.7675 R0.05
G1 X-2.5176
G3 X-2.5225 Y1.6677 R0.05
G2 X-2.4426 Y1.6462 R0.25
X-2.2676 Y1.3735 R0.3
G1 Y-1.3711
G2 X-2.3389 Y-1.5652 R0.3
G1 X-2.2665 Y-1.6267 Z-0.1155
G0 Z0.2
X-0.3294 Y-0.2723
G1 Z0.025 F39.4
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X-0.2996 Y-0.2344 Z-0.125 R0.2375
X-0.5001 Y0.1304 Z-0.142 R0.2375
G1 X-0.6178 F39.4
G3 X-0.6305 Y0.1177 R0.0126
G1 Y-0.1176
G3 X-0.6177 Y-0.1304 R0.0128
G1 X0.6287
G3 X0.6415 Y-0.1176 R0.0128
G1 Y0.1176
G3 X0.6287 Y0.1304 R0.0128
G1 X-0.5001
G2 X-0.7455 Y0.3052 R0.2596
G3 X-1.0426 Y0.2553 R0.1527
G1 Y-0.5297
G3 X-1.0298 Y-0.5425 R0.0128
G1 X1.0408
G3 X1.0536 Y-0.5297 R0.0128
G1 Y0.5297
G3 X1.0408 Y0.5425 R0.0128
G1 X-1.03
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G1 Y0.2553
G2 X-1.2486 Y-0.0538 R0.3348
G3 X-1.4547 Y-0.3629 R0.3348
G1 Y-0.9418
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G1 X1.4529
G3 X1.4657 Y-0.9418 R0.0128
G1 Y0.9418
G3 X1.4529 Y0.9546 R0.0128
G1 X-1.4421
G3 X-1.4547 Y0.942 R0.0126
G1 Y-0.3629
G2 X-1.6607 Y-0.6719 R0.3348
G3 X-1.8668 Y-0.981 R0.3348
G1 Y-1.3539
G3 X-1.854 Y-1.3667 R0.0128
G1 X1.865
G3 X1.8778 Y-1.3539 R0.0128
G1 Y1.3539
G3 X1.865 Y1.3667 R0.0128
G1 X-1.8542
G3 X-1.8668 Y1.3541 R0.0126
G1 Y-0.981
G2 X-2.0509 Y-1.3151 R0.3952
G3 X-2.3389 Y-1.5652 R1.2616
G2 X-2.5247 Y-1.668 R0.3
G3 X-2.5176 Y-1.7675 R0.05
G1 X2.531
G3 X2.5378 Y-1.668 R0.05
G2 X2.2786 Y-1.3707 R0.3
G1 Y1.3711
G2 X2.5357 Y1.668 R0.3
G3 X2.5286 Y1.7675 R0.05
G1 X-2.5176
G3 X-2.5225 Y1.6677 R0.05
G2 X-2.4426 Y1.6462 R0.25
X-2.2676 Y1.3735 R0.3
G1 Y-1.3711
G2 X-2.3389 Y-1.5652 R0.3
G1 X-2.2665 Y-1.6267 Z-0.1325
G0 Z0.2
X-0.278 Y-0.023
G1 Z0.008 F39.4
G3 X-0.2784 Y-0.0219 Z-0.0029 R0.2375 F6.5
X-0.2797 Y-0.0186 Z-0.0133 R0.2375
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X-0.285 Y-0.0064 Z-0.0305 R0.2375
X-0.2891 Y0.0018 Z-0.0365 R0.2375
X-0.294 Y0.0108 Z-0.0404 R0.2375
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X-0.7006 Y-0.2344 Z-0.067 R0.2375
X-0.2996 Y0.0201 Z-0.092 R0.2375
X-0.7006 Y-0.2344 Z-0.117 R0.2375
X-0.2996 Y0.0201 Z-0.142 R0.2375
X-0.5001 Y0.1304 Z-0.15 R0.2375
G1 X-0.6178 F39.4
G3 X-0.6305 Y0.1177 R0.0126
G1 Y-0.1176
G3 X-0.6177 Y-0.1304 R0.0128
G1 X0.6287
G3 X0.6415 Y-0.1176 R0.0128
G1 Y0.1176
G3 X0.6287 Y0.1304 R0.0128
G1 X-0.5001
G2 X-0.7455 Y0.3052 R0.2596
G3 X-1.0426 Y0.2553 R0.1527
G1 Y-0.5297
G3 X-1.0298 Y-0.5425 R0.0128
G1 X1.0408
G3 X1.0536 Y-0.5297 R0.0128
G1 Y0.5297
G3 X1.0408 Y0.5425 R0.0128
G1 X-1.03
G3 X-1.0426 Y0.5299 R0.0126
G1 Y0.2553
G2 X-1.2486 Y-0.0538 R0.3348
G3 X-1.4547 Y-0.3629 R0.3348
G1 Y-0.9418
G3 X-1.4419 Y-0.9546 R0.0128
G1 X1.4529
G3 X1.4657 Y-0.9418 R0.0128
G1 Y0.9418
G3 X1.4529 Y0.9546 R0.0128
G1 X-1.4421
G3 X-1.4547 Y0.942 R0.0126
G1 Y-0.3629
G2 X-1.6607 Y-0.6719 R0.3348
G3 X-1.8668 Y-0.981 R0.3348
G1 Y-1.3539
G3 X-1.854 Y-1.3667 R0.0128
G1 X1.865
G3 X1.8778 Y-1.3539 R0.0128
G1 Y1.3539
G3 X1.865 Y1.3667 R0.0128
G1 X-1.8542
G3 X-1.8668 Y1.3541 R0.0126
G1 Y-0.981
G2 X-2.0509 Y-1.3151 R0.3952
G3 X-2.3389 Y-1.5652 R1.2616
G2 X-2.5247 Y-1.668 R0.3
G3 X-2.5176 Y-1.7675 R0.05
G1 X2.531
G3 X2.5378 Y-1.668 R0.05
G2 X2.2786 Y-1.3707 R0.3
G1 Y1.3711
G2 X2.5357 Y1.668 R0.3
G3 X2.5286 Y1.7675 R0.05
G1 X-2.5176
G3 X-2.5225 Y1.6677 R0.05
G2 X-2.4426 Y1.6462 R0.25
X-2.2676 Y1.3735 R0.3
G1 Y-1.3711
G2 X-2.3389 Y-1.5652 R0.3
G1 X-2.2665 Y-1.6267 Z-0.1405
G0 Z0.6

M9
G28 G91 Z0.
G28 X0. Y0.
M30

Thank you,

Josh

[LibertyMachine · Accepted solution]

One side note; When sharing nc code, it's preferred to share it as an attachment, not as one veeeeerrrrryyyyyy long post 😉 Files must have a .nc or .txt extension (just rename it if needed)

Bad news (or good?) The backplotted code gives me numbers that are identical to your model (if you add in the .500" diameter of the cutter):

On a side note, the width of the pocket is drawn up as 5.0462", not the size you mentioned (5.035")

The problem exists somehow on the machine end. Does the tool actually measure .500"? Are there any cutter comp or tool settings overriding what you are doing?

[ANDERSONRODANDCHOPPER]

Sorry about pasting in all the code..... it kept kicking it out because it didn't like .tap. I will practice another method.

You are correct on the model being set for 5.046. That's what it should be.

Tool is 4.9950 according to my mititoyo slide calipers.

I was thinking along those lines that I have something set wrong in Mach 3 but was not sure. I was wondering if someone may be able to point me in the direction I need to make the necessary adjustments in Mach 3. I see where I can set offsets in the tool tab and did set up a tool #2 with a .5 cutting diameter but that did not help. I am lacking experience with Mach3 so I'm not shure where else to adjust compensations.
Thank you.
Josh

[k6ls]

is it only this code you're having problems with?

have you done other ops without problems?

if this is the first time, have you setup/calibrated your machines actual travel?

[ANDERSONRODANDCHOPPER]

To be completely honest with you I have been so consumed with learning fusion 360 CAD and CAM to actually make g code, that I fall down laughing in disbelief the I can actually get the machine to move and cut. Of course it usually ends up in a crash because my work envelope is so small on the machine or feeds rates are too fast and binds up the tool..... None the less I have made a few practice pieces that I did not pay attention to actual dimensions because the shape looked correct. So I thought I was good.

Last week I marked a part and ran it with 4 holes in a square pattern and they were all off as well. I bought the machine ready to go..... but it looks as if I have more to get ready before I go.

I will learn how to calibrate the machine tonight after work and report back to you guys. Anything else I may need to look for??
Thanks again

[bilingham · Accepted solution]

Hi, I too am using a diy X2 mini mill with Mach3.  The problem could be in the set up/ calibration of your ball screws.  Have you verified that you are getting the movement the the DROs indicate? The set up is a little tricky.  You should double check this.

Bill in Atlanta

[ANDERSONRODANDCHOPPER · Accepted solution]

@LibertyMachineand @bilingham , thank you for your advice.   You were both correct in that it was on the machine end... and more specifically the xyz movements were not calibrated correctly.   It was pretty simple to set the calibration and then I re-ran the program successfully.  I did not find any tool offsets or work offsets that were stored in MACH 3.  Again thank you very much and I will move forward from here.

Thank you,

Josh