Author Topic: Crank Webs - Twin Compound Engine  (Read 364 times)

Offline Swallowtail

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Crank Webs - Twin Compound Engine
« on: January 08, 2022, 08:10:51 PM »
I'm building the twin compound steam engine (by Bob Middleton) as per the drawings from this site, been wondering about the crank webs, I can do a short cut and cut them straight, but the drawing has a 40mm radius curve on two sides of each web x4. I quite like the design and wondering if anyone has dealt with this before and what they did. I was wondering about a a fly cutter set at 40mm and have each web set in a jig attached to my spindexer. I don't have a vertical mill, but a horizontal one. I have attached a pic of the design.

Offline Jasonb

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Re: Crank Webs - Twin Compound Engine
« Reply #1 on: January 08, 2022, 08:29:43 PM »
A boring head or flycutter should do that no problem.