Mach3 wrong size

When i post process in fusion 360 and load my TAP on mach3 the drawing is the wrong size… in 360 the project is 21 inches total but the machines moves all the way across in what is 3 inches on the drawing

Welcome to the forum. Posting the first 50 lines of your TAP file would help us help you.

(Machine)
( vendor: auto)
( description: Generic Cutting Machine)
N10 G90
N15 G71

(2D Profile10)
N20 G0 X-543.394 Y4.622
N25 M3
N30 G4 P1.
N35 G1 X-540.894 Y0.292 F1016.
N40 G1 X-437.011
N45 G2 X-420.688 Y-8.103 I0. J-20.066
N50 G1 X-336.434 Y-125.927
N55 G1 X-175.377
N60 G1 X-103.976 Y-8.618
N65 G2 X-86.835 Y1.016 I17.141 J-10.432
N70 G1 X0.
N75 G2 X1.016 Y0. I0. J-1.016
N80 G1 Y-38.1
N85 G2 X0. Y-39.116 I-1.016 J0.
N90 G1 X-75.628
N95 G1 X-152.502 Y-165.577
N100 G2 X-153.37 Y-166.066 I-0.868 J0.528
N105 G1 X-356.57
N110 G2 X-357.397 Y-165.64 I0. J1.016
N115 G1 X-440.884 Y-48.605
N120 G1 X-540.894
N125 G2 X-541.91 Y-47.589 I0. J1.016
N130 G1 Y-0.724
N135 G2 X-540.894 Y0.292 I1.016 J0.
N140 G1 X-538.394 Y4.622
N145 M5

N150 M30

Your units appear to be in Metric and it appears that you’re not using the Crossfire Version of post processor for Mach 3.

1 Like

I haven’t used the machine in a year or so. Should I re-download the link ?

It may be that your post is too old for the latest version of Fusion 360, so, yeah, follow the Langmuir instructions for installing the post processor to get the latest.