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Cutting a tapered hole

12K views 13 replies 12 participants last post by  Rambo 
#1 · (Edited by Moderator)
Can anyone think of a way to cut a tapered hole? I want a hole in a 3/4 piece of wood that is 1" in diameter at one end and 1 1/8" in diameter at the other.

The best idea that I have come up with is to make an insert on the lathe that I stick into a bigger (1.5") hole. I small lip hanging over the top edge would be acceptable and it would hide any imperfect fit of the insert into the bigger hole.

I keep thinking there must be a better way. I just don't know what it is.
 
#3 ·
Rich,
Poopiekat's suggestion is a good one. An alternative: Is the piece something you can spin in your lathe? Might work. The more I think about it, the more I think Poopikat's approach is the one I would try first.
Just a thought.
Roger
 
#4 ·
That is a very good idea that I had not thought of. Thank you.

I would probably initially cut a 1" hole with a forstner bit and use the spade bit to ream it out a bit.

If the hole is a little rough, I would make a tapered wooden plug on the lathe, wrap some sandpaper around it and use it to clean up the hole.

Thanks again. I knew I came to the right place.
 
#6 ·
Hi Rich,
Looks like everybody has the same idea. I would add when you grind the bit that to grind a relief on the back side of the cutting edge and it will work quite well.I have a number of bits that I have modified for this purpose and with the edge on the side does a very nice job.
tom
 
#10 ·
I have a "Brace and Bit" that I use for that function. The bit was made by Stanley somewhere around 1900 or 1910 and is tapered from 1 1/4 to 3/4" for a 6/4 board. My brain isn't working well right now due to some mind numbing pain meds, but that would seem to fit your needs.

Alternatively, if the angle doesn't need constant contact for the wood for strength, why not a "Stepper" bit, sold at your favorite box shop or HF. You could also wrap a piece of sand paper around the bit afterward and shove it into the hole again to increase the glue surface.
 
#11 ·
Drill a 1" hole, then use a dovetail bit with round template and bushing to widen the opposite side. Dovetail bits usually have 1/8 slope which over 3/4" depth would give you diameter on the other side = ... 1.1875" (1 1/5") …damn!... Why do you need 1.125"? Just make it 1.1875".
 
#14 · (Edited by Moderator)
Have you thought about a stepped drill bit?
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or maybe a tapered reamer
 
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