I am repairing an old cherry rocker. The mortises for the seat frame are a mess. I have cut the wood fillers that will overlap the mortise openings on the side. These fillers, in effect, will become half of a mortise (on the side). After gluing in the patches, I will reopen the mortises. My question is in regard to the proper glue to use for the patches and mortise and tenon joints. I have seen successfull chair joints glued with Titebond. I have seen epoxy crack in chair joints due to flexing. I was thinking about using Gorrilla Glue since this stuff expands to fill small gaps. For strength, I will probably pin the joints and run screws into the patches outside of the joint. This sounds like a little overkill though. Any ideas on the best glue to use?
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Replies
rfreiberg,
The strength of most joints is gained by how well the maker fit them and the relative moisture content of the wood it was made from. I would not look to any certain adhesive to make up for sloppy joinery.
With that being said, I use mostly hide glue for the things I make and regular titebond wood glue as well. I would think that using regular wood glue and pinning the joint would be sufficient. It all depends on how well you make the patches fit.
I don't think the foam from gorilla glue has much structural integrity. If you are truly concerned try using epoxy with a filler. I use the West System epoxy with their micro fiber filler with good success.
I think screws are overkill.
J.P.
Thanks for your response. The joints are sloppy. They have been repaired a few times. Maybe I should fill in the mortise completely and recut them to get a tight fit. I was looking for an easy way out.
rfreiberg,Another way to look at it is to clean the mortise and make sure it is sound and then add some material to the tenon to make up for the material removed from the mortise. I have used this technique as well with good success.J.P.http://www.jpkfinefurniture.com
That's a good thought. It sounds like I'll go with Titebond or the West System. I can do my best on the mortises and add to the tenons if needed.
Thanks
Your welcome.J.P.http://www.jpkfinefurniture.com
Glue in and of itself is not structurally sound. Your joinery should not provide a lot of gap for the glue to fill. I teach regularly at a Woodworking school and one of the things we show students is how yellow wood glue is actually stronger than the wood itself, in a properly made joint. We actually take the drops from table tops that are simply glued together and smash them over a bench. The wood fails before the joint every time. The point here is that you should make your joints well fitting and you can glue them with yellow wood glue and you should be fine...
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