C-Hook FLATSRF.DLL

[TFesta]

On mastercam 9.1, I'm just now using the C-hook FLATSRF.DLL to unroll a mandrel. I was just checking it with a straight dia of 52.49 and it came out with 164.793 length. But when I do a 3.14159 X 52.49 = 164.902. Can anybody tell me why it is like that? I know it's only .109 off in 164 inch, but I would think it would be closer. There is no stock thickness in this, just a surface.

[Lee.]

make sure you are analyzing correctly.

 

HTH

[John Summers]

If it's just a cylinder, you should use roll/unroll. FLATSRF.DLL is designed to flatten surfaces that are not quite cylinders, and some distortion is expected. It works on chord lengths, so more subdivisions will yield more accurate results.

[TFesta]

Thanks John, yeah that helped close the gap. I'm going to try the roll/unroll next. Thanks for the input.