Re: [CAD_CAM_EDM_DRO] Re: Resolution and surface finish

Fred Smith wrote:

> Often in aluminum a conventional cutting
> direction will result in a better finish as climb milling pulls the
> chip back & it gets crimped between the tool & the work, making a
> nasty finish.

Are you sure about this? I always climb mill for best finish.
My experience is that conventional milling is the direction that
causes recutting of chips and bad surface finish. The technical
books also confirm this with drawings showing why that is so.

In conventional milling, the cutting edge comes around and skates
across the already finished surface before developing enough
pressure to dig into the material, leaving the chip that was riding on
the cutting edge welded to the already finished surface.

With climb milling, the cutting edge comes around and plunges
hard into the UNCUT surface, biting in immediately, and even if
the attached chip does stick to the surface, that is the UNCUT
material it is stuck to. The finished surface is left clean.

Jon