Clark
Well-Known Member
- Joined
- Oct 19, 2006
- Messages
- 772
There are different schools of thought.
A) The $100k Mausers going to Africa have Silver Solder under the scope bridge.
B) The $2k Rem700 sniper rifles have epoxy under the scope mount(s).
C) Some guys just tighten the screws to get the bases to bend a little closer to the receiver shape, and lapp out the ring holes.
D) Some guys just screw on the mounts and screw on the scope.
E) Sometimes I just TIG weld steel rings directly to the receiver, with fixtures to get the scope bore parallel to the bolt bore.
I like epoxy. Each 6-48 screw at 50% efficiency will snap off at ~ 500 pounds of axial thrust.
Expensive Devcon or cheap Bondo will both have compression yeild of ~ 20kpsi.
So we need at area of epoxy .15" x .15" for every screw, and have ~ 50 times that much.
The epoxy with release agent will have a fit that conforms to within 0.0001".
Machined surfaces with complex shapes never fit that well.
I bore sight fixture the epoxy under the bases with rings tight on a scope. That way I can get the base(s) epoxied in the right place. I want centered scopes to go quickly with rings from one of my rifles to the next an be stress free and nearly sighted in.
Here is a pic of an M39 with octagon receiver. I have milled out a female octagon on the underside of an M16 riser mount. To mate the two, there is a layer of epoxy that can be seen.
A) The $100k Mausers going to Africa have Silver Solder under the scope bridge.
B) The $2k Rem700 sniper rifles have epoxy under the scope mount(s).
C) Some guys just tighten the screws to get the bases to bend a little closer to the receiver shape, and lapp out the ring holes.
D) Some guys just screw on the mounts and screw on the scope.
E) Sometimes I just TIG weld steel rings directly to the receiver, with fixtures to get the scope bore parallel to the bolt bore.
I like epoxy. Each 6-48 screw at 50% efficiency will snap off at ~ 500 pounds of axial thrust.
Expensive Devcon or cheap Bondo will both have compression yeild of ~ 20kpsi.
So we need at area of epoxy .15" x .15" for every screw, and have ~ 50 times that much.
The epoxy with release agent will have a fit that conforms to within 0.0001".
Machined surfaces with complex shapes never fit that well.
I bore sight fixture the epoxy under the bases with rings tight on a scope. That way I can get the base(s) epoxied in the right place. I want centered scopes to go quickly with rings from one of my rifles to the next an be stress free and nearly sighted in.
Here is a pic of an M39 with octagon receiver. I have milled out a female octagon on the underside of an M16 riser mount. To mate the two, there is a layer of epoxy that can be seen.
