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PostPosted: Wed Mar 13, 2013 9:40 pm 
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Joined: Sun Sep 10, 2006 6:43 pm
Posts: 763
Location: Copenhagen, Denmark, Earth, Universe
Hi,

I need to drill a small hole in a carbon tube. How do I do that without damaging the tube?

thanks


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Posted: Wed Mar 13, 2013 9:40 pm 


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PostPosted: Wed Mar 13, 2013 9:47 pm 
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Joined: Thu Aug 23, 2012 11:19 pm
Posts: 195
DON"T!lol


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PostPosted: Wed Mar 13, 2013 11:16 pm 
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Joined: Fri Mar 24, 2006 1:26 pm
Posts: 2529
Any sharp drill bit with an electric hand drill will work on CF. If you needed to drill hundreds of holes, a carbide bit would probably last longer than the ordinary high speed steel or TiN coated hihgh speed steel. CF is abrasive and wears cutting tools quickly.


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PostPosted: Thu Mar 14, 2013 8:34 am 
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Location: Copenhagen, Denmark, Earth, Universe
Thanks DaveS, it's just one hole so I will keep it simple.


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PostPosted: Thu Mar 14, 2013 9:12 am 
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Joined: Fri Feb 10, 2012 4:27 pm
Posts: 579
be sure to GO SLOW. you could cause stress concentration and cracking if you try to take it too fast.


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PostPosted: Thu Mar 14, 2013 11:13 am 
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Light pressure, med/high speed works best, if you push to hard it will split the back out (splinters really) and looks crud...

Show us what your working on? :thumbup:

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I guess there's worse hobbies than making a bike light? Right?


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PostPosted: Thu Mar 14, 2013 2:29 pm 
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Joined: Wed Mar 16, 2011 7:14 pm
Posts: 15
I always drill a small hole first then, with a sharp file open hole to size i need.
If you use a new file it will do way less damage to the carbon in the inside where you cant see.


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PostPosted: Thu Mar 14, 2013 2:49 pm 
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If the tube is very thin/fragile you may want to make up a small "doubler" piece and drill through that so the strength remains (like the diamond device that surrounded water bottle bolt holes) as some fibres will be broken by the drilling


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PostPosted: Thu Mar 14, 2013 2:50 pm 
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Location: NoVA/DC
You can get a set of abrasive diamond coated needle files from places like HarborFreight super cheap. risk of splintering with those is almost zero.


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PostPosted: Fri Mar 15, 2013 2:20 pm 
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Joined: Tue Feb 05, 2013 8:29 pm
Posts: 236
Another thing you will probably want to do is make a jig for drilling at an angle, asuming you're drilling for cables or the like. What exactly are you doing this for?

You can use a small block of wood, drill a pilot hole at an angle in the block of wood, then secure that to the frame and drill a pilot hole into the frame through the block. Then re-drill the block at your desired size and repeat against the frame.

Overall, I'm not so sure I'd recommend drilling a carbon frame unless you really know what you're doing.


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PostPosted: Fri Mar 15, 2013 3:13 pm 
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Joined: Wed Jun 10, 2009 2:16 pm
Posts: 365
Location: Austin, Texas
Don't be scared. Take your time. Go for it!


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Posted: Fri Mar 15, 2013 3:13 pm 


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