Re: [hobbicast] Helical tube cavity
- I'd be tempted to use a post-hole auger bit or ice-auger to hold the
pattern together... Scout yout local free-cycle group or garage sales for
the helical bit, then weld on short sections of pipe or something to get a
spiral hole in your mold...
I've seen 4" diameter bits that I bet would be a good size for this, but I
can't find one off hand.
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