04-10-2016, 08:46 PM
I'm in the dreaming/planning stage of a little project. Even though this is for a gun, it is just basic metalworking I need advice about. A little back-round on my project. I have an O/U 12 gauge shotgun, and I have .410 "sub-gauge" full length tubes. (Briley Champion ultralight's). The .410 tubes slide in and have a final interference fit at the chamber end from a mylar "button", at the muzzle end the tubes are a close, but loose fit. This is how they are supposed to fit, and work without a problem.
What I want to do is "cut" a grove at the end of the tube on my lathe and place a high temp O-ring to snug up the fit, to stop the rattle from the loose tubes. I've been using a couple layers of a metal tape, but I want a neater looking solution.
These dimensions are approximate, I've yet to take final dimensions, but will give us the idea of the scale of my little project. The Tube end I want to grove is .684" The O-ring I might use is .75" OD .625" ID by .0625. I plan to grove to the approx depth of .046875 leaving .015625 exposed.
What would be the best grooving tool? Would a round profile be best? I have some Valenite grooving tool holders I got from a friend that I can buy an insert for. I want the O-ring to stay seated in place during insertion as best as possible.
Thanks Mike
What I want to do is "cut" a grove at the end of the tube on my lathe and place a high temp O-ring to snug up the fit, to stop the rattle from the loose tubes. I've been using a couple layers of a metal tape, but I want a neater looking solution.
These dimensions are approximate, I've yet to take final dimensions, but will give us the idea of the scale of my little project. The Tube end I want to grove is .684" The O-ring I might use is .75" OD .625" ID by .0625. I plan to grove to the approx depth of .046875 leaving .015625 exposed.
What would be the best grooving tool? Would a round profile be best? I have some Valenite grooving tool holders I got from a friend that I can buy an insert for. I want the O-ring to stay seated in place during insertion as best as possible.
Thanks Mike