Countersunk hole clean out

[rc10johnny]

Hey Guys, I just got some powdercoat back from LTO and was wondering which flute to use to clean out the powder? Thanks JohnnySr

[Charlie don't surf]

5 flute 100 deg for the 8/32 and 5 flute 82 deg 4/40

[LTO_Dave]

Will the 5 or 6-flute bits work ok on aluminum when using a drill press or should they be used in a CNC or lathe?

I have the 3-flute bits from McMaster and the results aren't that pretty when using them on aluminum in a drill press. Will faster or slower speeds give better results or doesn't it matter?

[jwscab]

any flutes will work with any material. SFM, surface feet per minute, needs to be taken into account, which varies for a given material. 5 or 6 flute should give you a better finish. You might try bumping up the speed on the drill press with a 3 flute and try again, it's also possible the material might want a slower one also. A dull one could also cause some rough finish.

[rc10johnny]

well since my move all I have left is a hand drill no more drill press......