Strange Morse Taper drill bits. What do then fit?

[pontiac428]

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.

 

[LX Kid]

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.

The MT-1, in the pic, is from my Atlas / Craftsman 618, 6" lathe tailstock spindle.

 

[LX Kid]

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.

See Morse Taper Chart in post #5 above for MT-1 specs for comparison.

 

[CJ5Dave]

I got some similar bits in an auction toolbox. Somebody on another forum thought they were the bridge bolt type bits mentioned above.

 

[SLK001]

I got some similar bits in an auction toolbox. Somebody on another forum thought they were the bridge bolt type bits mentioned above.

Aren't they too small to be bridge bolt drills? Most of the bits are 1/4".

 

[Choiliefan]

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?

 

[RaisedByWolves]

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.

Prazi MD200, Prazi SD300, Unimat, some Emco, off the top of my head.

 

[LX Kid]

Prazi MD200, Prazi SD300, Unimat, some Emco, off the top of my head.

I tried looking up drill bits for your above suggestions and didn't see any resembling my bits.

 

[RaisedByWolves]

I tried looking up drill bits for your above suggestions and didn't see any resembling my bits.

You misread/interpreted my post.

 

[GrifterGuru]

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​