Re: Drilling Tufnol
It drills fairly normally with a few caveats.
Use a very sharp drill.
Use a pillar drill for carefully controlled feed.
Mount the work in a drill vice and bolt the vice down.
On your final size of drill, drill only half way from one side, turnover, carefully centre it up again and drill from the opposite side. This avoids breaking up the outer layers as the drill breaks through.
For a nice finish you can make up a tool with emery cloth on the outer or finish with a reamer.
If limited to stuff from a DIY shed, then pillar drill, drill vice and a hole-saw may be the best. Without positive positioning, the stuff does tend to make drills wander.
David
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Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done
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