end to the size shown, but I would recommend leaving the small end of the shank about .005 larger than
shown, so the button won't bottom out.
When completed, remove the tool post grinder, and reset the tail stock back to 00. Put the ground button
back into the lathe, and finish it to the correct size. Turn the lathe back with a fairly high RPM. Use the
diamond files, starting with the coarse and smooth the carbide.
Be careful as you only have .0005. After smoothing up with the coarse grit, use the medium, then the
fine. Finish with the fine to get the final size. Now with the very fine diamond compound, get a small
tongue stick, and coat it with light oil and diamond compound and finish lapping the button. You need
only be concerned with the leading edge and the top.
Finish as fine as possible. You will need a different taper pin reamer for each different size button that
you make. These reamers will be used to put the correct taper in the pull rod for the button.
You will need a different taper pin reamer for each different size button that you make. These reamers
will be used to put the correct taper in the pull rod for the button. The sizing button is made the same
way.
With stress proof, the finish is so good that I usually did not use the sizing button. In addition, with stress
proof, I found that the sizing button worked hardened the bore so much that it was difficult to pull the
rifling button through the barrel.
On the 4140-4150 steels, you will need to button ream to size the bore.