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Best method for closed circular pocket


killall-9
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I like Contour Ramp for things like this, depending on the size of the slot verses the tool. I would probably shoot for a tool that is between 50-75% of that slot width, ramp down the middle then contour the sides to finish or ramp down both walls. Im a big fan of ramping features like that.

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Like previously stated ramp that thing and Finnish with comp. If possible I like to get the biggest tool in there I can while leaving a little on the walls then Finnish it up either with a smaller tool that will overlap or the same size tool with comp. Hard to beat a good ramp with modern carbide I'm ramping in at 7 degrees minimum in aluminum.

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What I do is make an ID/OD and centerline geometry.. As others have said I just ramp the centerline chain with no lead in / out and compensation to off (just a 2d contour)... Then do an ID / OD pass with wear turned on , sometimes I will ramp the ID and OD especially if it is an O ring. I will leave .002" on the floor with the roughing pass, it works good.

 

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