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Triangle Drill Bit Shank
dav1965
Member Posts: 26,540 ✭✭✭
Triangle shank
The triangle shank is similar to a hex shank in that it is angled, but it only has three angles to the hex's six. It features many of the same strengths as the hex, including high torque capabilities and good centering. However, it cannot attach to quite as many different drill chucks as the hex.
I got a set today at the pawn shop. They are all very old and looks like it is just for drilling wood because of the centering tips and the flutes on the bit.
What were they made to go in?
They are in great shape and i would hate to cut the end off to make them work in a regular drill.
I would rather buy the right tool and save these like they are. I am thinking it could even be hand operated.
Any ideas?
The triangle shank is similar to a hex shank in that it is angled, but it only has three angles to the hex's six. It features many of the same strengths as the hex, including high torque capabilities and good centering. However, it cannot attach to quite as many different drill chucks as the hex.
I got a set today at the pawn shop. They are all very old and looks like it is just for drilling wood because of the centering tips and the flutes on the bit.
What were they made to go in?
They are in great shape and i would hate to cut the end off to make them work in a regular drill.
I would rather buy the right tool and save these like they are. I am thinking it could even be hand operated.
Any ideas?
Comments
And fiery auto crashes
Some will die in hot pursuit
While sifting through my ashes
Some will fall in love with life
And drink it from a fountain
That is pouring like an avalanche
Coming down the mountain
When you insert the drill bit into the chuck make sure the flats and the jaws line up and the drill will not slip.
Margaret Thatcher
"There are three kinds of lies: lies, damned lies and statistics."
Mark Twain
I could probably use them in a drill like they are but if there is a special tool to use them i would love to have that tool.
You can't fit those into collets or collet style holders, but drills should be fine.
Actually they work fine in a collet. The grip surface on a collet is much greater than any drill chuck (which is only holding on the three jaws).
Just try to use a Geometric Die head on a 3 jaw held piece and see how it slips vs. a collet held piece.
Margaret Thatcher
"There are three kinds of lies: lies, damned lies and statistics."
Mark Twain
quote:Originally posted by AzAfshin
You can't fit those into collets or collet style holders, but drills should be fine.
Actually they work fine in a collet. The grip surface on a collet is much greater than any drill chuck (which is only holding on the three jaws).
Just try to use a Geometric Die head on a 3 jaw held piece and see how it slips vs. a collet held piece.
Isn't the inside of collets round with a morse taper (usually)? That would only grip the shank on the three points of the triangle, and then only at the very end of the shank due to the taper. I suppose if you had a specialty three sided collet that wasn't rounded and tapered, that would work. But honestly I've never see one of those.
quote:Originally posted by Alpine
quote:Originally posted by AzAfshin
You can't fit those into collets or collet style holders, but drills should be fine.
Actually they work fine in a collet. The grip surface on a collet is much greater than any drill chuck (which is only holding on the three jaws).
Just try to use a Geometric Die head on a 3 jaw held piece and see how it slips vs. a collet held piece.
Isn't the inside of collets round with a morse taper (usually)? That would only grip the shank on the three points of the triangle, and then only at the very end of the shank due to the taper. I suppose if you had a specialty three sided collet that wasn't rounded and tapered, that would work. But honestly I've never see one of those.
No. Collets have straight inside walls. Morse taper is fixed and Morse Taper sizes start with 1 and it is about 3/8" diameter. R8 collets (for bridgeport type mills, 5C for lathes and fixtures (indexers and rotory tables), 2J for lathes (comes in bigger sizes than 5C). ER series is for tool holding in milling machines and used in some lathes.
There are specialty tooling for specific machines, coolant thru drills and lots of other stuff.
Margaret Thatcher
"There are three kinds of lies: lies, damned lies and statistics."
Mark Twain
I prefer them over a round shank, no slippage. Would be a shame to cut off the end.
YEP[^]
Brace and bit?
I have my Dad's old carpenter tools. The brace and bit along with some blade bits for the brace made it the the "power tool" for hanging doors in the day. Jack and block planes and super sharp chisels fill out the tool box.
If I remember correctly those self feeding drill bits had a 4 sided tapered shank. The jaws of the brace had 2 jaws that tightened on the tapered shank.
Margaret Thatcher
"There are three kinds of lies: lies, damned lies and statistics."
Mark Twain
Exactly what I was trying to explain earlier, Alpine. I didn't have the pic like you did though. If you use those in a check or collet you will end up with what approaches a 3 point contact surface. Don't try.
A tapered 4 point shank self feed drill is very, very different from a straight shank drill with three flats ground on it. Night and day difference.
Apples and Oranges.
Margaret Thatcher
"There are three kinds of lies: lies, damned lies and statistics."
Mark Twain
Brace and bit?
You have the answer!!! I used them years ago when roughing in house wiring. Labor intensive to say the least.
Three sides on the shank of the drill bit is to give the drill chuck (which has three jaws to clamp onto the drill bit) a better grip on the drill.
When you insert the drill bit into the chuck make sure the flats and the jaws line up and the drill will not slip.
Yes,,+1