guide line to machining different Ra surface

bally · Oct 17, 2005

how can i edm different Ra on my workpiece ?
example :
workpiece pocket depth 2mm with draft angle 10"
require
suface Ra for btm suface is 2.2--2.6 and side wall is 0.4--0.8
pleases help me ..
thank you

EDM AE · Oct 17, 2005

I'm guessing your application is a mold cavity for semiconductor encapsulation transfer molding? I've done many of those in the past, and have found that probably the simplest way is to write an inverted orbit routine which will finish the bottom at the rougher finish, and successively reduce power as the electrode orbits upward and outward. This will also be more cosmetically appealing since the finish will get smoother as it transitions from the floor to the side wall, without leaving an obvious "step" from rough to fine finish.

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guide line to machining different Ra surface

bally

Plastic

EDM AE

Aluminum

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