HOMEMADE RIFLING MACHINE (Free plans and new idea!)

[AB-SHOP]

Hi everyone,

This is my latest video: I decided to make a little dream come true, a challenge started as a bet a few years ago, when a friend told me that with the standard parallel lathe you can't make a pitch as large as the typical 1:250 (mm) of the internal rifling of a firearm (1 turn in 250 mm) or in any case you go beyond the metric/inch values (6 mm as a maximum for example): I don't want to build a weapon (Obviously) but winning the bet YES!

The new idea that made me decide to attempt the challenge is that the idle joint "releases", separates the linear advancement but not the axial one, which is made by a cam that anyone can design and print at home: the cylinder of the joint is welded to the M12 screw that passes into the nut of the lathe spindle, the axis instead of the central shaft rotates idly inside the bearings of the joint.

The Cam pitch can be customized with a 3D printer, you can change it as you prefer, forces that arrives to the cam curve are very small.
As you see, on the same axis (the lathe axis!) there are a pitch of 1.75 mm (M12) and a pitch of 250 (mm) (pitch of the plastic cam 1 turn in 250 (mm), so not 1 complete turn anyway because my lathe is short, but with a larger lathe you can reach larger dimensions/longer barrel and the pitch remain the same,1 turn in 250 mm, so in my case I can make a part of the 250 mm pitch, with a barrel of 250 mm you can develop the 250 mm)

Hope you liked it,
Alberto