First post on here!
I’m creating a piece that requires a M12 threaded rod driven permanently into some endgrain on Japanese cedar (soft), which will in turn be used to attach a removable part.
I experimented with drilling a 10mm hole, then tapping the endgrain (yes, I know!) and glueing in the rod. However, because the tapping (predictably) churned up the hole so much the rod ended up being a bit loose in the hole.
So, on my next test I threw caution to the wind, drilled a 10mm hole, then drove the threaded rod straight into the hole, with a bit of wood glue to hopefully provide enough resistance to stop it from being turned inside the hole when turning bolts etc on the rod. It went in beautifully, nice and snug, but with a fair bit of resistance and creaked a little on the way in.
My question is, is that 12mm diameter rod now applying too much outward pressure to the piece? Would you think it would crack sometime down the line, with changes in humidity etc?
Want to get some opinions before I risk it on the final piece. Right now thinking about going out an buying a bit for an 11mm hole, just to give the wood a bit of breathing space.
Any thoughts would be much appreciated.