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A gun barrel is not an easy thing to drill accurately. Some rather specialized machinery is utilized.
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Granted yours is a short barrel but take a look around here for some ideas as to how they're made: Specifically look here: It is my understanding that a gun drill is a special lathe with a hollow drill (not a twist bit by any means) that floods the cutting edge with lots of oil for lubrication, cooling and chip removal. There is an awful lot of info on rifles, shooting and some on barrel making on the web site above. The barrel is rather critical in the performance of the gun. I wouldn't attempt one on a mini-lathe myself. How do you plan to rifle the barrel? ----- Original Message -----
From: taurokm3 To: 7x12minilathe@... Sent: Wednesday, April 11, 2007 5:00 PM Subject: [7x12minilathe] Re: Deep Hole .218 x 8" The material is 4140 Steel, and it will go in the chuck, it would go through the spindle, but I have no way to clamp it to the face plate. This is going to be a gun barrel. It is .770" diameter and 8 inches long (total), with a tip that is 1" x .950" I am thinking of building some v notched clamps out of aluminum that would bolt to the faceplate, with notches for the bolts so I can center the stock. It has been suggested that I weld a standard bit to a length of drill rod with a V and use that, I just don't know what kind of hole that would give me. Thanks Doug --- In 7x12minilathe@..., "John" <John@...> wrote: > > Are you drilling this hole into material that can be held in the lathe > chuck? Material dimensions and the material type would be helpful info. > > The technique is straight forward (but tedious) if the material fits > in the chuck. Best situation is if the material fits through the > spindle, of course. > > John > > > > --- In 7x12minilathe@..., "taurokm3" <grimjack@> wrote: > > > > Any one have any thoughts on the best way to go about a deep hole > > without buying a deep hole rig? I am currently experimenting with a > > home made drill, .175 x 11" shank with a .218 x 1" head, and I want to > > mill it to a flat on top and bottom, then sharpen it like a twist > > drill. I know it will need cleared frequently, and a lot of lube. > > BTW, I am using oil hardening drill rod for the bit. Any one have any > > other ideas? > > > |
