Thanks for your advice! When I select the area to apply the 2D peel to, mastercam selects the entire piece, even though i just click on the highlighted rectangular area I was to rough out first. Should I be preparing the surfaces first by doing something to them? I've never had to do that before. Yes I do have surfacing toolpaths and I have the same issue with any toolpath I select, when I select the area to rough out the whole part gets highlighted. Should I recreate the piece? I imported it from an .ipt file originally. Thank you Joanna

Hi everyone, I've imported a 3d .ipt into Mastercam and I'm trying to setup the toolpath to machine the part. However, I am not sure which toolpath I should use. I've tried doing a regular contour with a ball nose endmill and it didnt work. I'm pretty new to Mastercam and have only done a few Mastercam programs so far - I've watched many videos and done many tutorials but this is in 3d and I can't seem to get it right. Description of part: Its a rectangular part with a 45 degree slanted cutout on each side running through the centre of the part. I don't know how to achieve the slant for the cutout. Any help would be appreciated - thank you Joanna