Reaming
On Aug 12, 11:09 am, Fortunat1 wrote:
...
I'll just have to get a good
quality reamer and prepare each hole carefully. I'll see if I can get a
drill bit that brings he holes a little closer to the final size.
May I suggest you get more than one drill bit, for the same
reason you need more than one reamer?
..What is the annealing temperature for 4130? You can drill through
a bandsaw blade by spot annealing it, that is you chuck a blunt rod
like a nail with the point ground off into a drill press bring that to
bear
on the spot to be drilled until it gets good and hot, then let it
cool
slowly. Now the spot is annealed and a hole can be drilled with
an ordinary bit.
So I wonder if re-drilling the holes will heat them to the annealing
temperature? Or would it be feasible to spin a rod in the holes
to heat them by friction to soften them? Or would that just
work-harden the surface....
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FF
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