DIY Sine Bar Button rifling cutter

[Cave Troll]

I need help with a possible project that I've had for a while.

It's a machine that takes a deep bored steel rod, and cuts rifling into it to turn it into a barrel. It utilizes a button made of extremely hard steel, or (the better option) a button made of tungsten carbide. If it can fit into a tube cut to an inside diameter of .30 it would be great, but if it can go down to an inside diameter .22 of an inch it would be perfect.

This is pulled from a machinist forum:

A sine bar rifling machine is not nearly as exotic as the name implies. Think of it as a rifling machine with a taper attachment akin to an engine lathe's. A way to rotate a rifling head without using traditional rifling guides, which at the very least are a PITA to make.

If you take a wide flange beam about 12 feet long that is a place to start. This should be about a W10X45, which is a nominal 10" deep and 8" wide beam with 5/8" thick flanges. You need to get the edges of those flanges machined on one side of the beam. I.E., two edges facing up, nice and flat their full length and both in the same plane(we have turned the beam on its side so these two edges can be the start of the "ways"). To those two edges, bolt on two 1" X 2" X 12 ft. lengths of 1018 cold drawn bar. This of course requires tapped holes in the edges of the beams, and drilled and counterbored holes (for socket head cap screws) in the 2" faces of the 1018 bars. Put 1/4-20 screws on 4" centers. When this is all lined up nice and parallel (you did clean off all burrs and chips and made sure screws were flush or below flush), with the screws tight, you have the beam with with the 1018 bars on, 2" faces facing up, centered on the flange thickness of the beam. Already it starts to look like a bed. Rig up some legs for this to get it up to your choice of working height. Your bed is is already a 700 lb plus assembly, so take care

This is a possible way to get this done, but I wonder if improvements can be made.

Any Ideas?

[Greg Miller]

That description is about as clear as mud to me, seems like they're just describing just the bed of the machine.  But there's lots of videos of these being made on Youtube:
https://www.youtube.com/watch?v=0AKW-K4RyXo

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[David Ortiz-Grob]

Can I ask why?

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[Cave Troll]

For rifling barrels and to have a proof of concept. One more step in the self build that not many have done.

[David Ortiz-Grob]

The reason I asked is that barrel blanks aren't too expensive and this could end up as a very expensive project. I found these when I was looking into rechambering my RPR in .223rem http://www.grizzly.com/rifle-barrels

On Thu, Feb 9, 2017 at 8:33 AM, Cave Troll <4barre...@gmail.com> wrote:

For rifling barrels and to have a proof of concept. One more step in the self build that not many have done.

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[David Ortiz-Grob]

Although i remember them being much cheaper than that. Hm. Still could be cheaper but much less dramatically so.

[Tim Miller]

http://firearmshistory.blogspot.com/2010/05/rifling-manufacturing-electro-chemical.html

[Tim Miller]

http://imgur.com/a/diHx7  from fosscad

[David Ortiz-Grob]

Thats pretty kick ass. Totally practical too, esp in 9x19. For a rifle length barrel you could print a couple identical helixes and snap them together to get the length up over 16" 

[Tim Miller]

here is a 44magnum 

 https://imgur.com/a/FuVCP

you can find the guy in #fosscad on OFTC.net

On Feb 9, 2017 10:46 AM, "David Ortiz-Grob" <david.or...@gmail.com> wrote:

Thats pretty kick ass. Totally practical too, esp in 9x19. For a rifle length barrel you could print a couple identical helixes and snap them together to get the length up over 16" 

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[Cave Troll]

Never heard of an RPR before, but I googled it. It it like a Rem 700, but made by Ruger?

[Cave Troll]

This is pretty kick ass, and I may want to try it instead. Thanks Tim!

[David Ortiz-Grob]

Its meant to be an entry level precision rifle that come stock with a chassis system. I'm going to the range tomorrow so I'll have it with me tonight if you want to check it out. 

Let me know if/when you're doing the electrochemical rifling, I'd love to check it out/help

On Thu, Feb 9, 2017 at 6:26 PM, Cave Troll <4barre...@gmail.com> wrote:

This is pretty kick ass, and I may want to try it instead. Thanks Tim!

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[Cave Troll]

I'm just thinking about the ins and outs, but I might be showing my face around the space more often. Nice kart by the way. Kevin showed me it last week.

[David Ortiz-Grob]

Thanks,i'm working on V2 now

On Mon, Feb 13, 2017 at 1:39 AM, Cave Troll <4barre...@gmail.com> wrote:

I'm just thinking about the ins and outs, but I might be showing my face around the space more often. Nice kart by the way. Kevin showed me it last week.

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[David Ortiz-Grob]

Just ordered some 4130 bar stock and a 9.00mm reamer so we can take a crack at cutting some spiral grooves

[Luca Hammons]

I just found this about rifling and thought of this thread 

http://hackaday.com/2017/03/08/diy-barrel-rifling-with-3d-printed-help/

[David Ortiz-Grob]

Thees also this video that I just stumbled on in the comments of this article

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