Pillar bedding recommended? Services where?
- Thread starter alfie318
- Start date
.. yes .. understood we are talking about the same thing (different name) I was using 'Acraglass' which is epoxy ... and often referred to as 'glass bedding' material. Regardless of what you prefer to call it.. the 'slump' of the product can also prevent the material from flowing into undercut areas and - if you use metal pillars with grooves cut in them - prevent the material from flowing into them. Unfortunately it is usually impossible to tell if the material has flowed completely ... which is why in virtually every construction using concrete and re-bar .. vibrators are used to ensure that the rebar is properly encased - and reinforcing the cement.
... so with a dam several hundred feet high it cant be constructed in one monolithic section ... the pours are done in sections like stacks of domino blocks.... a combination of well greased steel forms and wood installed where there are irregular rock faces are used -- after each pour the top was treated with a brown chemical (not sure what that was called) but that allowed us to later 'IRA' jet the top surface of the pour and cut off the thin shell of cement that was left there. .that left a very rough surface for the next pour. -- which was also reinforced and tied together with rebar.
I have absolutely no idea what the concrete mix was because that was done at another location and brought down to site - I am sure it was well supervised by experts ... what I do know is that after each bucket was dropped ,,,, a crew of us vibrated the hell out of it with 6" diameter vibrators making sure that we got under and around the rebar that was placed by the riggers (I guess they call them 're-inforcing rodworkers' but we knew them as 'riggers').
I also operated the 'IRA' jet which was pretty impressive as it would cut the 2 inch planks that were used in some areas like butter. As for AIR in the concrete .. was never obvious to me. Nor were cooling pipes ... although recall that this is a dam we are discussing and one side is going to have a permanent wall of water behind it while turbines are fed by penstocks that run through the dam.
I can not imagine why anyone would go to the trouble and expense of installing tons of rebar if they intended there to be air pockets in the concrete that preventing the rebar from providing the structural strength required??
Thanks for all the input, I'm probably going to forego the pillars and just get it "normally" bedded, as well as free floated. I've also been advised that my concerns with recoil induced damage were largely unfounded given that this rifle is in .30-06.
The potential for recoil induced damage is largely due to the material (laminated birch) and the effects of recoil. With recoil, the stock will flex outward at the magazine well so that splitting usually begins at a point behind the magazine. Once the stock splits here, flexion can cause the stock to split both behind and ahead of this point. This is why transverse doweling is effective. As far as pillars are concerned, their purpose is indeed to prevent compression of the stock as the screws are tightened. The angled screw on the Ruger does help to keep the recoil lug tight against the surface which supports it. In doing so it stresses the stock down and back. This is why I like the idea of casting a fiberglass pillar at this location. The pillar becomes an integral part of the stock; a part which is more resistant to splitting than is the original stock wood.
