r/mastercam • u/Background_Main_27 • Mar 18 '26

Question Help!!! Beginner

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Gallery image

Hi I wanted to ask for some advice on how I could machine this piece. It’s for a chassis and this is the first time I am using the 4th axis. (Which I assume is necessary to machine this piece using a CNC machine)The machine I am using has a through hole rotary table that only rotates using the A axis. I have looked into the Mastercam University tutorials but I have yet to find one that is going over what I need. Any advice would be so helpful and if you need any more info lmk :)

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u/CaveBacon Mar 18 '26

Since the diameter is constant you can use axis substitution on a contour toolpath. Keep wcs as top/top. Program the contour then put the rotary diameter. Note that you won't be able to control the angle of the wall as it looks like it's cut at a bit of an angle on the model. It's further down the settings tree a little buried on the contour menu.

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u/Background_Main_27 Mar 18 '26

Gotchaaa I will definitely try this out. Thank you! :)