TubOLard

iTrader: (-2)

Hi. What kind of countersinking tip do I need for m3 screws? There are many different kinds here and i don't know which to use. What kind of drill bit should I use to avoid splintering? Holes I need to drill are very close to the outer edge of bottom deck. Thanks in advance.
http://www.mcmaster.com/#drill-bit-countersinks/=gzt2re

CarbonJoe

If you go by the catalog at McMaster, the flat head M3 screws that they carry are 90 degree head angle.

A standard countersink works if you go slow. Use a drill press if possible. Standard HSS bits work for drilling.

Lessen

iTrader: (2)

Wear a dust mask at the very least.

robk

iTrader: (22)

Dremel sells a stone bit which is very close to the countersink on most screws. The carbon fiber is harsh on most metal countersinks.

koz47

iTrader: (97)

carbide burr- mcmaster carr sells them, best tool for countersinking,new holes

43035A92 4-40 size but m3 should be close

daleburr

Clamp the carbon to some mdf or plywood which will help prevent splintering. And only use new, sharp bits and feed it through slowly on a drill press. I use HSS drills and countersinks, but they do go blunt quickly

SlowerOne

Yes, metric countersinks are all 90 degrees - same as a normal drill. HTH

CarbonJoe

For consistent results with the countersink, use a depth stop on the drill press.

Mike Mandio

iTrader: (5)

Solid-Carbide Drill-Point Countersinks

http://www.mcmaster.com/#countersinks/=h0580x

Nothing better. You want 90 degree for M3

TubOLard

iTrader: (-2)

Thank you all