Just a quick update on progress, I am busy making the barring engine at the moment.
This is the full size one, so you can see it is tiny in comparison to the flywheel it has to turn.
The model starts off by making the worm and wheel, the worm is a bit complicated in that it is also the crankshaft and eccentric.
All this was machined from solid.
Blank for worm wheel being formed on the Alexander milling machine using a Tom Senior dividing head.
Teeth on the wheel were cut on Mikron hobbing machine, it was a real fluke that I had the correct cutter for this.
Transfered to the boley & Leinen jig borer in order to produce the cruciform section spokes.
Here is the embryo crankshaft having the mating worm put on.
I made this fixture for turning the crank and eccentric pins, but it was a failure I am afraid, being made from aluminium it was just not rigid enough.
So I modified my Keat's angle plate to do th job and that worked much better.
You get a sense of the scale of the finished shaft next to a ruler.
More to follow.
Phil