A method of reducing the diameter of round blanks for spar, using a thread cutting die and a drill.
I've been wanting to try this, having a good size set of threading dies. I always want them tapered, though, but thought of doing this with various size dies only so far along the spar, giving a tapered but "stepped" spar, then hand sanding the steps. I think it could work.
What a great way to quickly rough out a taper. I think I could then take the rough shape and put the piece on the lathe for final shaping and smoothing.
If I had a lathe, I don't think I'd be looking for other ways to taper the spar.
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- Jul 26, 2013
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That doesn't look tapered to me, just reduced in diameter. I usually just power a square strip through a metal drill gauge, which doesn't thread the dowel.
What a quick and efficient way to tear up the surface of whatever’s left of your dowel.
Use sandpaper and a drill. Easy.
Use sandpaper and a drill. Easy.
This doesn't thread it either. The teeth are used to cut the size, not thread it. Admittedly, I expect the finish won't be as smooth as other methods, but I think it would be fairly constant in diameter and finish up easily with sandpaper. Just my opinion, though, I've never tried it.
I've used 0.5 & 0.6 mm carbon fibre.