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Post by texaswoodie on Jan 16, 2012 8:31:26 GMT -5
I have a customer that wants me to drill holes in my cabs. My initial reaction is, that's not what cabs are for, but whatever floats your boat I guess.
How do you drill a hole in a cab? If you drill from front to back, you have to drill on a curved surface. If you drill back to front, the drill will chip the front when it comes through.
Curt
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Post by mohs on Jan 16, 2012 10:48:07 GMT -5
Hi Curt Your analysis is a conundrum as oppose to ruby corundum
drill the hole first...then cab ? mostly
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Post by FrogAndBearCreations on Jan 16, 2012 10:58:58 GMT -5
That is what I would do also, drill the preform then cab it.
Also if the cabs are already done then drill from the back to about the half way point and finish from the front. This will eliminate the chip out problem!
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RickN
noticing nice landscape pebbles
Member since November 2011
Posts: 85
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Post by RickN on Jan 16, 2012 11:04:32 GMT -5
I use a Dremal with a round diamond bur and drill under water. Start the drilling at a slight angle with light pressure when you feel it start to bight then stand the Dremal straight up and down.Use a light pulsing motion up and down don't force it. Your dentist is a good place to get used burs in different shapes. Works for sea glass to.
RickN
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Post by jakesrocks on Jan 16, 2012 11:19:54 GMT -5
Front to back. To prevent or at least minimize chipping, you could try temporarily glueing a piece of glass to the back.
Like RickN says, on a domed cab start your hole on an angle. You only have to make a tiny indentation before going straight through.
If you do get some chipping, you can clean it up with a cone shaped diamond bit.
Don
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Post by Hard Rock Cafe on Jan 16, 2012 13:44:12 GMT -5
What Frog, Rick, and Don said. In addition, you don't have to run the Dremel at full speed. You'll get better life out of the burrs by running at a middle to low speed. Yorkshire Jack can probably give specifics on speed.
Chuck
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Post by texaswoodie on Jan 16, 2012 14:20:54 GMT -5
Thanks guys. I guess I'm off to the store to buy yet another tool. It just never stops.
Curt
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chassroc
Cave Dweller
Rocks are abundant when you have rocktumblinghobby pals
Member since January 2005
Posts: 3,586
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Post by chassroc on Jan 17, 2012 9:18:02 GMT -5
Blow Out is a consistent problem when drilling rock and to some lesser extent glass. You should use a drill press and lift up and down to let the chips clear out. Turning it over and finishing from the opposite end does help prevent this problem but introduces a precision problem of drilling the same exact spot on both sides. Charlie
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Post by FrogAndBearCreations on Jan 17, 2012 9:35:12 GMT -5
I use a caliper to put a mark on both sides, that way I know it is in the correct spot
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Post by Hard Rock Cafe on Jan 17, 2012 13:47:05 GMT -5
If you go slowly with a tapered bit, you can just pierce the other side. I use a Dremel drill press.
Chuck
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NDK
Cave Dweller
Member since January 2009
Posts: 9,440
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Post by NDK on Jan 17, 2012 15:56:05 GMT -5
I, like Chuck said, use a tapered bit. When it just pokes through, finish from the back. Use lots of water, and go SLLLLLOOOOOOOW!
Nate
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