I am building a harp with three laminations on the curved pillar and neck (11mmpurpleheart, 15mm tas oak, 11mm purpleheart).
The centre piece is routed to shape, and I've now glued on the outer laminations of purple heart and was using a flush trim bit to match the shape. I still had about 5-8mm overhang so was trying to take it slowly. As soon as I went against the grain it shattered some of the wood - thankfully all exterior. Ok, I was experimenting because I have gotten away with it twice before with rock maple and honduras mahogany.
So what do I do? I intended to flush trim, and then use a curved bit with ballbearing (correct name?) to round the edges. But because of the curve on this piece, half of the grain will always face into the router bit.
I have now planed and spokeshaved the timber almost flush. But I'm not game to attempt a pass or to use the rounding bit until I understand more.20140716_171301.jpg
The centre piece is routed to shape, and I've now glued on the outer laminations of purple heart and was using a flush trim bit to match the shape. I still had about 5-8mm overhang so was trying to take it slowly. As soon as I went against the grain it shattered some of the wood - thankfully all exterior. Ok, I was experimenting because I have gotten away with it twice before with rock maple and honduras mahogany.
So what do I do? I intended to flush trim, and then use a curved bit with ballbearing (correct name?) to round the edges. But because of the curve on this piece, half of the grain will always face into the router bit.
I have now planed and spokeshaved the timber almost flush. But I'm not game to attempt a pass or to use the rounding bit until I understand more.20140716_171301.jpg
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