How can I drill a deep, non-standard, small diameter, hole?

[Michael GilliganParticipant @michaelgilligan61133]

It's interesting to ponder that the old watchmakers, and the expert modern ones, successfully drill[ed] very small holes, using a machine powered by a bow.

MichaelG.

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https://m.youtube.com/watch?v=qdisUObDbg0

Edited By Michael Gilligan on 13/07/2018 20:58:29

[JasonBModerator @jasonb]

You could probably work out the rpm given the length of bow, dia it was wrapped around and how many strokes a minute, don't expect it is massively fast.

They probably also had the knack of taking the load off the drill on the back stroke which would have helped regularly clear swarf.

[Michael GilliganParticipant @michaelgilligan61133]

Posted by JasonB on 13/07/2018 20:57:18:

… don't expect it is massively fast

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Yes, that was my point.

MichaelG.

[Author]

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