Westbury Cam Turning Jig

Westbury Cam Turning Jig

This topic has 4 replies, 4 voices, and was last updated 23 November 2024 at 14:50 by Roderick Jenkins.

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23 November 2024 at 11:50 #766273
Clive Brown 1
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@clivebrown1
In the Jan. ’82 issue of ME, Ian Bradley gives an outline description of a 30cc engine he made. In the article he refers to a camshaft turning jig based on an Edgar Westbury design. A sketch is attached. Another sketch shows the jig mounted between lathe centres on the “arbor”.

I can’t see how this jig works. Any ideas?
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23 November 2024 at 13:22 #766287
JasonB
Moderator
@jasonb
It is the same principal as turning the radius edge on a flange. The jig allows the edge of the cam to rotate at a distance from the lathe’s ctl line so that the flank radii can be turned tangent to the base circle diameter. You can do the same thing with a boring head set to swing an external cut. Just imagine the lower half of that flange was missing and the shape would be a cam lobe.
23 November 2024 at 13:44 #766291
Roderick Jenkins
Participant
@roderickjenkins93242
Looking at this article below I’m not sure if the jig is intended to cut an offset radius for each flank since reference is made to indexing at 5 degree intervals, sort of more like an analogue CamCalc

Article from ModelEngine News

Rod
23 November 2024 at 14:32 #766306
ChrisLH
Participant
@chrislh
Rod. The 5 degree cuts are to form the minor diameter part of the cam, the bit which is marginally clear of the tappet so the stepped effect doesn’t really matter. The major contacting parts of the cam are continuous curves formed by the eccentric turning at single settings of the camshaft in the jig. You are left with handwork for the cam nose but that’s easily done.
23 November 2024 at 14:50 #766308
Roderick Jenkins
Participant
@roderickjenkins93242
Chris, agreed. I’ve just braved the storm to retrieve the appropriate MEs from the workshop. The relevant pages are below. Looking at the references given in the MEN article, Chaddock describes a method for developing the full R theta form, of the sort that CamCalc produces, for cutting in a lathe with indexing on the lathe spindle and a flycutter on a milling spindle attached to the cross slide.

Anyway, hope this helps,

Rod
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