[distx]

Hello! Fairly new to the forums, as well to using mastercam.

I'm going to create a casting-mould.
I'll be using a Ball-endmill, 6mm

Looks somewhat like this: (Larger picture at http://i.imgur.com/VhEUZ6x.png)

How do?

[silverslammer]

rough pockets usiing 'surface-rough-pocket'.....for finishing there are lots of options depending on what you want, eg: 'surface-finish-parallel' / 'surface-finsih-radial' / 'surface-finish-flowline'

[billystein]

for finish i would use scallop. since i have been making diecast molds i like the total cutting of scallop.
parallel is more top view and contour is more side cutting. scallop transitions nicely between both.

[asmanss]

for finish operation
select surface finish flowline(be carrefully surface way)select spiral cut and z .1mm after cutting tolerance 0,005.

[bhurts]

Since you will only need to 3d mill the bottoms of the dome shape I would use surface finish radial.

Ben

[billystein]

if this is a mold then the sides are drafted. also, radial steps over in the top view. since i am now in a moldmaking shop i will be the one who polishes it. with scallop the .01 stepover starts at the top and down the sides and across the bottom, making for easier polishing. if i made this in an aircraft shop i would use parallel and let the deburr guys do their thing.