You are right, A gun barrel is hard to drill. I would love to be able
to buy a deep hole rig and the bits, but if I could afford that, I
wouldn't need to ask questions. Not to mention, it would not fit in
my upstairs spare bed-room turned machine shop. I am in the process
of building a rifling machine, which will only ream and rifle. I am
debating trying to build a tiny hook cutter, or to make a stepped
rifling reamer. The reamer is a tad more complicated, but at this
small size, probably a better choice than a tiny hook cutter. BTW are
you a Lilja from the Lilja barrel folks?
--- In 7x12minilathe@..., "Pete Lilja" <plilja@...> wrote:
A gun barrel is not an easy thing to drill accurately. Some rather
specialized machinery is utilized.
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?
> >
>
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