Best countersink drill bit for Carbon fibre??

[bretts]

I need to do 4 holes in a chassis but want a neat job.

I tried a counter sink bit I got with a big drill bit set and it was rubbish.

Recommendations please??

Ta

[bigalbi]

I have been using these with good results in both Carbon and Aluminium

http://www.ebay.co.uk/itm/6pcs-90-3-Flute-Edge-Countersink-HSS-4241-Chamfering-End-Mill-Cutter-Bit-BI024-/272471568759?hash=item3f70923177:g:wzgAAOSwlMFZEhH G

[CHEVY]

Depending on angle of countersink

American different to others

[Peakey]

Is it imperial or metric your doing? Like Chevy said if it's US it'll be imperial I got some from the US the other year that have been great can't remember the name though :lol:

[fidspeed]

try googling it quite bit of useful info out there

dave

[bretts]

Ta...yep good old wikipedia. I wil want do unc for these holes and metic in future projects.


According to wikipedia unc is 82.5 deg and metric is 89.9 deg.

Thanks guys

[dodgydiy]

i use appropriately angled conical diamond bits for countersinking carbon now, it kills the normal countersink bits, save them for alloy now.

[Conrad]

http://www.ebay.co.uk/itm/Countersink-Tungsten-Carbide-Burr-90-10mm/371254156875?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2055119.m1438.l2649

Best countersunk bit I have came across, the right angle for M3 headed screws and carbide so it will last donkeys even on carbon ;)

[danielc3009]

i use appropriately angled conical diamond bits for countersinking carbon now, it kills the normal countersink bits, save them for alloy now.

Where do you get them from?

[bretts]

Hi All

I picked up an 82 deg 6 mm bit which worked great for the 4-40 screws and also a 90 deg bit which worked for the m3 screws. Not sure how many holes i'll get done using these bits but for £6 for them both it did the job I needed doing.

Next, I need to find someone who will cut a piece of brass for me neatly if I supply the template????