Drilling Carbon Fiber Chassis
#1
Drilling Carbon Fiber Chassis
I would like to have some experienced chassis builders let me know on drilling holes and countersinking into a Carbon Fiber Chassis.
I have never quite been able to get a smooth hole or countersink. When drilling through on my drill press even with a block of wood under the chassis to drill through and into the hole is not smooth edges like at the factory where a chassis is made.
Basically the holes on the exit side may get a little splintered. Do they use like a grinding stone drill bit or faster speeds or certain feed rate?
On countersinks I find the end finish is not as nice as the factory did. I use the 90 degree for metric and a sharp mult-flute countersink. Is this a special grinding countersink tool?
I have never quite been able to get a smooth hole or countersink. When drilling through on my drill press even with a block of wood under the chassis to drill through and into the hole is not smooth edges like at the factory where a chassis is made.
Basically the holes on the exit side may get a little splintered. Do they use like a grinding stone drill bit or faster speeds or certain feed rate?
On countersinks I find the end finish is not as nice as the factory did. I use the 90 degree for metric and a sharp mult-flute countersink. Is this a special grinding countersink tool?
#2
Tech Champion
As long as I taped both sides and clamped it to the wood I always got a pretty clean hole. Make sure to let the bit do it's work and not to pressure it through.
#3
Drill a small pilot hole all the way through first, then drill the final diameter part way through from each side to avoid splintering. From the small # holes I've drilled and countersunk, I'd have to say the stuff is damn hard on standard drill bits and countersinks. Industry used diamond and carbide to machine cf.
#4
Tech Master
iTrader: (1)
The first thing is make sure your bit is sharp.. Then make sure the chassis is flat on a piece or wood.. The wood keeps the chassis from splintering bad.. You can clamp it to the wood for best results..Mka esure not to go to fast when applying pressure.. If you push hard you wont have a clean hole..
I use a countersink bit for countersinking.. you can pick them up for a few bucks at any hardware store.. Make sure to only go deep enough for the screw head.. I usually take a bit off then check to see fitment then take a bit more... Or is use my drill press, and set it so it stops at the right depth.. Practice on a scrap piece to set it..
I have also use a cone tip dremel bit.. But you have to be super carefull not to take to much off.. This way takes time to get perfect..
I use a countersink bit for countersinking.. you can pick them up for a few bucks at any hardware store.. Make sure to only go deep enough for the screw head.. I usually take a bit off then check to see fitment then take a bit more... Or is use my drill press, and set it so it stops at the right depth.. Practice on a scrap piece to set it..
I have also use a cone tip dremel bit.. But you have to be super carefull not to take to much off.. This way takes time to get perfect..
#5
As for drilling holes in carbon, I usually drill until the I can see the bottom start to bulged out, then flip the carbon over and finished drilling. Usually when the drill goes the carbon, there is a chance that the bottom will splinter. As for countershunking I have had good luck with the flute countersunks.
#6
Tech Master
iTrader: (1)
There are proper drill bits for drilling CF, can't remember what they are called now, been so long. Otherwise, block the carbon fibre, apply enough pressure to the drill to keep it steady and keep it cutting.
Drill through the top, turn it over the countersink. If you not too handy with a hand drill, use a drill press to keep it square.
Dagger drills, thats what they are called http://www.gandtrack.co.uk/html/carbon_composites.html designed not to splintered unblocked carbon sheet.
Drill through the top, turn it over the countersink. If you not too handy with a hand drill, use a drill press to keep it square.
Dagger drills, thats what they are called http://www.gandtrack.co.uk/html/carbon_composites.html designed not to splintered unblocked carbon sheet.
#7
Tech Lord
iTrader: (13)
you want to use high helix carbide circuit board drills.you will get about 2500-5000 holes before you need to regrind depending on if your speeds and feeds are correct.being you are using it on a drillpress which are pretty low RPM,you should be able to get 200-300 holes with no splintering before a regrind.you can get them from McMaster Carr for about 10 bucks a piece.for countersinking an 82 degree or a 90 degree carbide countersink is what you need.standard screws use 82 degree and metric screws are 90 degrees.i will look up the part numbers on monday at the shop so you can order them.
#10
Tech Adept
you want to use high helix carbide circuit board drills.you will get about 2500-5000 holes before you need to regrind depending on if your speeds and feeds are correct.being you are using it on a drillpress which are pretty low RPM,you should be able to get 200-300 holes with no splintering before a regrind.you can get them from McMaster Carr for about 10 bucks a piece.for countersinking an 82 degree or a 90 degree carbide countersink is what you need.standard screws use 82 degree and metric screws are 90 degrees.i will look up the part numbers on monday at the shop so you can order them.
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Jason, do you know of any other company that has a good Countersinker
Solid-Carbide Three-Flute Countersink 3/8" Body Dia, 1/4" Shank Dia, 82
Degree Angle
Phone call:
I was told that if somone will try to order it for me in the US
and "McMaster Carr" finds out it is to be send out of the US, then
they will cancel you order.
Thanks
Alf
#11
I have great luck with the few holes I have drilled and countersunk using
Pilot Drill then
Morse 82 degree size 0 counter sink.
Pilot Drill then
Morse 82 degree size 0 counter sink.
#12
Tech Adept
#15
Kose makes a tool for that: