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Go Back   REVscene Automotive Forum > Technical Discussion > Autobody, Lighting, & Structural Tech

Autobody, Lighting, & Structural Tech This forum is brought to you by RPM Electronics in Burnaby.
Discussion about modifying your auotomotive lighting, retrofits, auto body, share projects, ideas, etc.


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Old 08-27-2013, 03:51 PM   #1
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What kind of drill do I need to drill carbon fiber?

What kind of drill do I need to drill carbon fiber?
Just want to drill mounting points.

I have a wood driller, my friend told me it wouldn't work and would crack it.
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Old 08-27-2013, 04:23 PM   #2
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A brad point bit


or a spur bit

this one is easier to find at the hardware store.

If you can, go at it from both sides, avoid blowout.
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Old 08-27-2013, 04:24 PM   #3
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The drill bit is probably more important than the drill; I've used a titanium coated bit on CF before and it worked fine. Start with a smaller hole and work your way up.
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Old 08-27-2013, 04:30 PM   #4
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depends on what type of carbon your drilling...thickness, weave, epoxy all change things.

- Clean holes can often be made with a Rotabraoch tool. It's a piloted cutter that will give a nice clean edge.

- A step drill can also work well, but they don't last very long with carbon. Use a brand new one.

- Normal HSS metal drill bits work alright when sharp, but its easy for them to give a ragged edge on the back side. Backing the piece up with a piece of wood helps a lot with this. If you are making a big enough hole, a sanding barrel in a ginder will clean up the fuzzy edge pretty well.

Always tape both sides of the piece.

I avoid wood bits like the Spur Bit or brad points shown above, they tend to destroy the carbon and epoxy...at least with the stuff I've drilled out.

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Old 08-29-2013, 12:47 PM   #5
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First time drilling, went to get a wired drill set for ~$50 at canadian tire. I just used the brad point bit and it worked pretty good I guess, not a perfect job but good enough for me.

What does taping both sides do btw?
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Old 08-29-2013, 02:28 PM   #6
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Taping both sides of the work helps to keep the top and bottom epoxy coatings from chipping.

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Old 08-30-2013, 07:15 PM   #7
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Thanks for the help everyone, wasn't as hard as I thought
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Old 08-30-2013, 08:04 PM   #8
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use a good masking tape... blue painters tape works really well with it. Mask both sides of where u want to drill the hole.
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