Hi, I'm in the process of modelling a cam for my work

I drew the path as a flat pattern then wrapped it onto a cylinder, made a 3D sketch of the engrave and proceeded to use cut sweep to model the groove.

The profile was is 47 high, 28 deep, and it measure this at the top and bottom of the cut but along the curved section running down the side it shows up at 46.3 when i use the measure tool across the top and bottom surfaces of the trench

I was wondering if anyone could explain why this is and if there is anything i can do differently to get a consistent 47 across the entire cut?

Any help would be greatly appreciated

Edit: I'm currently using SW12 thanks to work still using windows XP