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| drilling/boring a very long hole? |
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| Fergus OMore:
What you have to remember is that the chuck end of a drill is soft-- and therefore can be drilled-- and a slightly undersized rod silver soldered to give the length plus room to work outside the tailstock. I've seen pipe makers who have adopted these but the danger- IMHO- is clogging the flutes-- somewhere. The drill then goes off centre, wanders and pops out-- somewhere- but not where you want it. It was with these points in mind that I penned my experiences. |
| AdeV:
Fergus - John Bogstandard suggested the exact same technique to me when I was drilling out a motorcycle swing arm mounting tube, I used a blacksmith's drill with a mystery steel extension shaft; because the blacksmith's drill has a smaller shaft at the end, I drilled out my steel rod rather than the drill. I didn't bother with silver-solder, I drilled through both & used a pin, peened over at both ends to stop it falling out. I initially had a lot of problems with it binding up in the hole; I had to grind a fair amount off the drill bit itself, probably only leaving 2" of flutes at the original size, before I could get it to drill straight & true without binding. |
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