How to countersink in carbon fibre

[kaszal]

Hello, can you advise me on how to drill coutersinks in carbon fibre without access to a press drill? Can it be done carefully by hand, power drill or even cone shaped dremel? Does anyone have experience of this? I'm using 3mm carbon and M3 CSK screws. Thanks

[Jamie.T]

I currently use a press drill, but i had no issues doing it with a countersink bit in a battery drill before, just make sure you do it vertically and apply plenty of pressure behind the drill and it will cut a nice countersink.

[chris brown]

Yep. I've done it by hand.
I used a drill at first, well a drill bit in a dremel type tool and then used a cone shape tool on the dremel.
I also used a special countersink tool to better effect. it was just part of one of those cheap drill bit kits that come in a vac formed plastic case. I imagine you can get one cheap from wilko. I had to use it in a drill though as it had a large fitting that wouldnt go in the dremel.
Chris.

[Dazzler]

To ensure the screw head seats correctly in the countersink, you'll need to use a countersunk bit. Drill bits will most likely have the wrong point angle as it varies dependant on the material it has been intended to cut.

[kaszal]

Thank you all

Is there a countersink bit you recommend e.g. off eBay or B&Q? Will a regular power drill work or do I need more revs e.g. from a Dremel type tool?

[Jamie.T]

Originally Posted by kaszal

Thank you all

Is there a countersink bit you recommend e.g. off eBay or B&Q? Will a regular power drill work or do I need more revs e.g. from a Dremel type tool?

A power drill will be plenty, try and keep the speed down too as it prevents excessive heat. The countersink bit is available from most DIY store, eg, B&Q, Homebase e.t.c, it looks like this:

[Jamie.T]

Or like this

[kaszal]

Nope, image still not there. But thanks for trying!

[Jamie.T]

Both images should be there now, try Ctrl + F5 to refresh. Image links weren't working for some reason.lol

[Dazzler]

You could do an eBay search for 'Bosch 13mm tool steel countersink bit' and one should turn up for £3.99 plus p&p.

Or look at it, and buy similar in b&q. Seems reasonable though.

[bodgit]

You also have to match the angle of the csk to that on the screw or it will not seat correctly.

[Dazzler]

I have assumed he will be using a metric countersunk screw on his cat? What's happening to the cat this week kaszal?

[kaszal]

This week I 'ave mostly been...

... fiddling about with the rear suspension to get the b###### to handle better. I'm trying to learn such things on this website http://home.scarlet.be/~be067749/58/

The countersink holes are to go in the 3mm top deck. I want to use CSK screws so I don't have to put holes in my new belt cover from brian s.