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jonp
03-23-2021, 04:47 PM
Anyone know about these? I saw a whole box of them at a flea market still in the plastic tubes and most had the original oil on them. Are they worth anything used? Guy didn't know what they were and I probably could have gotten 20-30 for $50.
elginrunner
03-23-2021, 05:28 PM
if memory serves, they will probably be a one flute drill bit for drilling deep holes, probably with a through hole for pressurized cutting fluid.... I'm sure we have some machinist that will know for sure...
jonp
03-23-2021, 05:29 PM
if memory serves, they will probably be a one flute drill bit for drilling deep holes, probably with a through hole for pressurized cutting fluid.... I'm sure we have some machinist that will know for sure...

I looked them up and that is what they seem to be.
elginrunner
03-23-2021, 05:54 PM
When we did work for Dana corporation we made drive shafts. We did gun drilling for lubrication through the part... I guess maybe sterling is just a brand name??
M-Tecs
03-23-2021, 06:21 PM
If you have the proper machines to run them on they are very valuable. If you don't have high pressure thru the spindle oil flush not so much.

https://www.sterlinggundrills.com/gun-drills.php
M-Tecs
03-23-2021, 06:25 PM
https://www.youtube.com/watch?v=KB8vj3IeIkE
idsubgun
03-23-2021, 07:07 PM
If you have the proper machines to run them on the a very valuable. If you don't have high pressure thru the spindle oil flush not so much.

https://www.sterlinggundrills.com/gun-drills.php

THIS^^^^^^^^^^^^^^^

I've ran hundreds of gun drills over the years, and you need the proper machines. I ran them on CNC mills. This is the mill I ran before retiring. You can see some gun drills in the tool holders on the stand in front of the mill. That whole machine is a CNC mill that cost a little over a million dollars. We machined blocks of tool steel for injection molds. Some of those blocks were 4'x4'x2'. Big and HEAVY!! You loaded them in the left end and the carousel rotated 180 degrees into the machining chamber. There's a door behind me that you could actually walk into the chamber.

http://i.imgur.com/C4Uz3VNm.jpg (https://imgur.com/C4Uz3VN)

http://i.imgur.com/15n2i7cm.jpg (https://imgur.com/15n2i7c)
fixit
03-23-2021, 09:47 PM
I ran set up on several banks of gun drills.... interesting machines! Deep hole drilling machines can bore holes faster than you ever thought possible, and to shocking tolerances, then you can add gun reaming, which was just beginning to be a thing when I left that company.
Scrounge
03-23-2021, 11:21 PM
Anyone know about these? I saw a whole box of them at a flea market still in the plastic tubes and most had the original oil on them. Are they worth anything used? Guy didn't know what they were and I probably could have gotten 20-30 for $50.

https://sterlinggundrills.com/

If you wanted to pick up the box, and ship them to me, I'd be happy to pay your costs, and add $50 for a profit for you. I have one .375" drill that I found at a swapmeet a few years ago.

Bill <-- not a machinist, but learning to become one, and doing it as a hobby.
jonp
03-28-2021, 07:50 AM
https://sterlinggundrills.com/

If you wanted to pick up the box, and ship them to me, I'd be happy to pay your costs, and add $50 for a profit for you. I have one .375" drill that I found at a swapmeet a few years ago.

Bill <-- not a machinist, but learning to become one, and doing it as a hobby.

If we cruise down there in the near future and they are still there I'll pick them up for you. Price paid + shipping + $50 sounds good to me.
jsizemore
03-28-2021, 10:14 AM
I saw them yesterday. He's been hauling them around for a while. Still in the plastic tubes.
Scrounge
03-28-2021, 01:18 PM
If we cruise down there in the near future and they are still there I'll pick them up for you. Price paid + shipping + $50 sounds good to me.

works for me!

Bill
jonp
03-28-2021, 07:21 PM
I saw them yesterday. He's been hauling them around for a while. Still in the plastic tubes.

Wonder why no-one wants them? They were in good shape. I guess a flea market isn't the place most who use that type of thing cruise into to buy them
M-Tecs
03-28-2021, 07:41 PM
Wonder why no-one wants them? They were in good shape. I guess a flea market isn't the place most who use that type of thing cruise into to buy them

Without a thru-the-spindle high pressure oil flush they are not usable for most applications. A standard drill press or lathe won't cut it unless they are used to ream and you still will have a chip removal issue.
TyGuy
03-28-2021, 09:25 PM
And here I thought this was going to be a thread about training with a British subgun...
jsizemore
03-28-2021, 11:24 PM
I mentioned them to a few folks that do machining work. No takers. I don't know anybody that does custom barrel production. All of them appear to be 6-12" in length.
country gent
03-29-2021, 11:18 AM
another reason they dont work well in most standard lathes is the long drill takes up to much room to have it and a part in the machine. On most of our machines the beds are 24"-40" between centers. If you dont have a spindle hole big enough for the part then your fighting for room