The Micrometer

A two-monthly review of the engineering of time

Issue 12   July - August 2018

 

Drilling holes

One of those things that virtually everyone does, drilling a hole with some precision and without breaking the drill is not as easy as it sounds, especially when the drill is of the order of 1 mm diameter or less.  Undoubtedly the key to success is a sharp drill and a rigid set-up, closely followed by the correct feed pressure.  Spindle speed is, I have found, something of a second order parameter, and is counter-productive if the high speed overheats the drill tip due to lack of coolant.  High speed invariably means high power, the energy from which has to be dissipated at the drill tip in the form of heat.

And so this time I present as a download an incredibly simple tool which concentrates on providing a sensitive means by which the feed pressure can be controlled.  Unlike the vast majority with their awkward linkages advertised and described in several magazines, my attachment is neat, and I can commend it to the more discerning constructors who like their machine tool accessories not to look like something made from the scrap box.

Guy Gibbons

Copyright (c) 2018  G E Gibbons     If you do not see the updated pages you expect, try again after by-passing or clearing your browser cache.  Guidance may be found at https://en.wikipedia.org/wiki/Wikipedia:Bypass_your_cache

The Micrometer

A two-monthly review of the engineering of time

Issue 12   July - August 2018

The Micrometer

A two-monthly review of the engineering of time

Issue 12   July - August 2018

Copyright (c) 2018  G E Gibbons        If you do not see the updated pages you expect, try again after by-passing or clearing your browser cache.  Guidance is at https://en.wikipedia.org/wiki/Wikipedia:Bypass_your_cache