When face-to-face gluing plywood to particle board does it help any to use screws under any circumstances?
I'm not referring to an advantage during the drying process since I have clamps. I'm talking about as a way to add strength to the bond
*after* the glue has set and dried.Thanks.
Darren Harris Staten Island, New York.
I would suppose any attachment, that makes 2 separate pieces more of a sing= le unit, would be a benefit. Also, though I wouldn't expect too much diffe= rence in the expansion and contraction of each of the 2 different plies, th= e maximum bonding of them into one unit would help eliminate the effects of= any differing movements.
Sonny
One or the other. Once the glue dries, the screws are irrelevant. The glue will be stronger than the screws.
The screws will significantly add to the sheer strength of the joint
- and particularly the SHOCK syrength. Likely not required, but it WILL add strength.
Yeah, and biscuits, too. They would add shear and shock (wtf?) strength. Likely not required but they WILL add strength. And also steel dowels would add strength, especially for all that SHOCK.
It depends entirely on the application - and the glue. The OP did not specify the glue - or the application. Biscuits are not going to do much on a face to face joint - unless, possibly, it is a relatively small joint on relatively large pieces. The glue is (in almost all cases) stronger than the wood itself. Some glues are very strong under steady force, but fragile under shock. Some strong in tension, and weak in shear And like I said, the screws would increase the strength of the joint - but what good is it if the joint is stronger than the wood.
So -MIKE-, you don't have to get sarcastic, if that was your intent.
That was my only intent. :-p
This is a repair arcade game cabinet project.I needed to cut off the bottoms of the particle board sides and glued in replacement piece made of plywood. I wanted to strengthen the edge-to-edge joint. so I'm gluing in more plywood over the seam inside the cabinet and I was told I should use screws.
Thanks.
Darren Harris Staten Island, New York.
Personally, I'd go the other direction into the plywood so there are no screw heads disturbing the outer finish to pop filler off of. Make the inside box a tight fit into the outer box, and overlap a minimum of 2 or 3 inches into the upper chip-board case. Even 6 inches would not be excessive. 3/8" ply would be plenty for that application. Not sure I'd even bother with screws in the ply-wood to plywood joint, but on the old particle board I WOULD use screws - I'd put them in from the inside, about 1/2 the thickness of the particle board, about evety
6 to 8 inches. There is not a lot of strength to the particle board so the "pins" created by the screws will help hold it together so your joint does not open up when you move it around the rec room.
Go for it.
I'd probably glue and screw, bondo, sand, prime, and paint.
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