The New Guy
Join Date: Dec 2011
Location: Down south, where the food is good.
Celtic knot question
I'm attempting to make a pen with a celtic knot in it. I've got the basics, but every time I try to drill the blank, I manage to crack it and it breaks in half on me. Very annoying. Hopefully someone can shed some light on the topic and tell me what I'm doing wrong.
I make a 45 degree cut into the blank, then glue in a kerf sized sliver of another type of wood (currently paduk sandwiched between purple heart) into the cut and clamp it all back together. I don't use a lot of force with the clamps; just enough to keep things together while the glue dries. Two hours later, I make another cut, and add another sliver. Rinse and repeat till I have all four in and the piece back together. Usually I get the last piece in around 10:00 or 11:00. Then I go to bed and let it dry till the morning. It gets a full 12 hours to dry before I attempt to drill it and continue the pen, but somehow I always manage to break things along one of the glue lines. Then, of course, the blank is trash so I have to start again.
I'm using Titebond III as the glue. Is that the wrong glue? Should I wait more than 12 hours for it to fully cure? Would a 5 minute epoxy work better? I typically spin the blank on the lathe and use a drill chuck with the bit in the tailstock to drill the hole through it. I spin the blank around 750 RPM typically and make slow cuts. Should I be spinning faster or slower? Should I try to drill faster?