The Micrometer

A two-monthly review of the engineering of time

Issue 9   January - February 2018

 

Drilling a square hole

In production, machining is done using as few processes requiring secondary equipment as possible not only to save time transferring the work from one facility to the next, but also to save investment in the additional equipment.  Traditionally requiring a pull- or push-broaching machine, one such machining operation is cutting a square or other non-circular hole, but for short holes a rotary or wobble broach eliminates the need for a broaching machine.

     Shown in use on the Home page, I have designed and made such a tool.  Useful for cutting the square holes in clock winding ratchets and winding keys, my engineering drawings appear as a download to this issue.

 

Dead-beat pallets

Two other downloads cover the theme of dead-beat pallets, and the second - The Asymmetric Crutch - perhaps controversially suggests that the sacrifice of symmetric action and its possible consequences for rate-keeping has not yet been justified.  Do readers have any thoughts?

 

Index

The Archive page in this issue includes an Index to all past articles appearing in The Micrometer, which I hope readers might find useful.

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 9   January - February 2018

The Micrometer

A two-monthly review of the engineering of time

Issue 9   January - February 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