On Thu, 19 Sep 2013 08:49:21 -0700 (PDT), PCS
wrote:

On Thursday, September 19, 2013 9:00:34 AM UTC-4, Karl Townsend wrote:

Thanks for the carbide lead. A push button was in my (super cheapo)

price range.





I'm going to modify a turret plate with a 1.375 square by real long

gundrill tool holder. Drill 12", back up and stop. Loosen holder,

slide ahead, restart drilling. I'd use a manual lathe but the hardinge

has a nice flood coolant setup and complete enclosure.



Karl

Ahhh, very clever that.

I would think your push bar problem is less about compression and more about bowing.

It's so constrained by the bore that there would be no significant
bowing.

An uneven force will cock the button off center for a bad result...as far as I understand it.

I'd think that it's important for the mating faces to match well and
to be most of the bore diameter.


I've heard of using hydraulic force to push a button through a (threaded) barrel.
I wonder if some type of a grease gun would have enough pressure?

Will look forward to updates on your progress.

I am still hoping to make a reproduction rifled barrel for my .177 air pistol some day.