Strange Morse Taper drill bits. What do then fit?

Those look like them "bridge bolt" taper drills that they use for drilling for fastener or hot rivet joins in structural steel with a mag drill.
 
SLK001 said:
Just a question. What machine has a MT1 taper on the tailstock socket? I'm assuming that you've put a live center in the picture to give us scale. And, BTW, that really doesn't give us the scale. That part could have any of the Morris tapers shown above, with an equivalently sized bearing package and center point. That's like putting a cookie in the picture. Is the cookie 1", 2", 4", or 12" in diameter? We still don't know.
Click to expand...
The MT-1, in the pic, is from my Atlas / Craftsman 618, 6" lathe tailstock spindle.
 
SLK001 said:
Just a question. What machine has a MT1 taper on the tailstock socket? I'm assuming that you've put a live center in the picture to give us scale. And, BTW, that really doesn't give us the scale. That part could have any of the Morris tapers shown above, with an equivalently sized bearing package and center point. That's like putting a cookie in the picture. Is the cookie 1", 2", 4", or 12" in diameter? We still don't know.
Click to expand...
See Morse Taper Chart in post #5 above for MT-1 specs for comparison.
 
I got some similar bits in an auction toolbox. Somebody on another forum thought they were the bridge bolt type bits mentioned above.
 
CJ5Dave said:
I got some similar bits in an auction toolbox. Somebody on another forum thought they were the bridge bolt type bits mentioned above.
Click to expand...
Aren't they too small to be bridge bolt drills? Most of the bits are 1/4".
 
Its odd they don't have a tang but the taper is small.
Any chance it's a Morse 0?
You may have already mentioned it, but who is the manufacturer stamped on the shank?
 
SLK001 said:
Just a question. What machine has a MT1 taper on the tailstock socket? I'm assuming that you've put a live center in the picture to give us scale. And, BTW, that really doesn't give us the scale. That part could have any of the Morris tapers shown above, with an equivalently sized bearing package and center point. That's like putting a cookie in the picture. Is the cookie 1", 2", 4", or 12" in diameter? We still don't know.
Click to expand...
Prazi MD200, Prazi SD300, Unimat, some Emco, off the top of my head.
 
Wild guesstimation, but could they be a B&S #3 taper??

Brown & Sharpe Tapers​

Size​
Large
End​
Small
End Dia.​
Taper
Length​
Taper
per ft.​
#1​
0.2392"​
0.2000"​
0.94"​
0.5020​
#2​
0.2997"​
0.2500"​
1.19"​
0.5020​
#3​
0.3753"​
0.3125"​
1.50"​
0.5020​
#4​
0.4207"​
0.3500"​
1.69"​
0.5024​
#5​
0.5388"​
0.4500"​
2.13"​
0.5016​
#6​
0.5996"​
0.5000"​
2.38"​
0.5033​
#7​
0.7201"​
0.6000"​
2.88"​
0.5010​
#8​
0.8987"​
0.7500"​
3.56"​
0.5010​
#9​
1.0775"​
0.9001"​
4.25"​
0.5009​
#10​
1.2597"​
1.0447"​
5.00"​
0.5161​
#11​
1.4978"​
1.2500"​
5.94"​
0.5010​
#12​
1.7968"​
1.5001"​
7.13"​
0.4997​
#13​
2.0731"​
1.7501"​
7.75"​
0.5002​
#14​
2.3438"​
2.0000"​
8.25"​
0.5000​
#15​
2.6146"​
2.2500"​
8.75"​
0.5000​
#16​
2.8854"​
2.5000"​
9.25"​
0.5000​
#17​
3.1563"​
2.7500"​
9.75"​
0.5000​
#18​
3.4271"​
3.0000"​
10.25"​
0.5000​
 
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