Good day Cam Masters,
When I'm machining in actual, it seems my dimensions are not 1:1 compared to my CAD and CAM design. I run a simple test program to check the accuracy of the post processed dimensions. I made a 100mm long slot with 10mm dia cutting tool (as attached). When I post processed it, it shows movement in X-axis -83mm (as attached). Do I need to do something with my settings? I'm using Cam Express 12.0 and also tested in it Solid Edge Cam Pro. Same result.
Hope you guys can help me.
The engage and retract is done outside of the part, you control this with the engage and retract settings of the non-cutting-moves dialog within the operation.
From the image of the tool path in respect to the part, the NC code is correct.
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Matching the Gcode to your image...
N70 & N80 are your yellow curves. This is governed by non-cutting moves -> Engage
N90 = the cut = cyan curve
N100-N110 are the white curves, this is governed by non-cutting moves -> retract
The reason N80 is not "X-50" and N90 is not "X50" is also governed by non-cutting moves - so you start the "cut" motion outside the part (rather than engaging into the part). You can play with non-cutting moves -> Engage to remove the extra distance and make the cyan line start at the edge of the part (if you want, but I would prefer it look more like it does)
If you need help on the non-cutting moves -> Engage dialog (or any other in NX) hit the "F1" key while the dialog is open - this should route you to the proper section of the docs
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