Best end mill for stock work?

[bigngreen]

I'm getting a number of builds that require slight inletting changes for bottom metal, mainly going from BDL to a DBM inlet and I'm wanting to eliminate chipping of gel coat finishes like a McMillan or a Bell and Carlson type finish, I guess this would be also a question on methods used to eliminate chipping as well as tooling!!

 

[Gabe22BR]

I use a file around the edges.

 

[MClark]

When cutting composites carbide, new and sharp, is the way to go. The fibers wear high speed quickly. When using a manual mill going slow at lower rpm will prevent the resin from melting.
Cutting Kevlar is always an issue, very tough and leave fuzzy fibers.

Mark

 

[bigngreen]

I'm using a manual mill. I have used some variable pitch three flute mills a little and they seemed good but I got a little chippage! I want very clean lines, the amount of rounding I want would amount to a swipe of 600 grit, if possible.

 

[Gundoktr]

Climb mill!

 

[boltfluter]

I'm getting a number of builds that require slight inletting changes for bottom metal, mainly going from BDL to a DBM inlet and I'm wanting to eliminate chipping of gel coat finishes like a McMillan or a Bell and Carlson type finish, I guess this would be also a question on methods used to eliminate chipping as well as tooling!!

I would use an endmill with a left hand flute to push the chip down instead of up. This should solve your problem.

Paul

www.boltfluting.com

 

[tac284]

Right hand cut left hand helix