Thanks Dave.
Yes, the parts are small and fiddly, but one of thing I was agonizing about was getting the scale of the governor correct, to often you see engines dominated with over scale governors, small governors don't work as well but after all they are not working engines as long as they look right and work something like is the important thing.
Any way on with the link arms first the arms that will hold the balls.
Turn and thread a small length of 4 mm dia bar M2 I took care to get the length the same on both bars I don't want the balls hanging odd
Then carefully mill the 4mm dia into 2mm square.
Then drill 0.8mm for the links.
Her they are fitted.
That was the easy bit now for the more complex yolk link.
First mill up the shape in a chunk of mild steel more than enough to make two links.
Zero the mill on the x, Y edges of the bar, and drill 0.8mm holes in correct position as deep as the slender drill would go, fast speed, drop of cutting fluid and peck the drill in and out to clear the swarf.
Now for milling the slot, the arms will only be 1mm thick and as the slitting saw will tend to spring the arms open the slots were cit in the bar well away from the edge to give a thicker section I'll mill them to size later.
With thin sections its important to use good sharp tools if they are blunt the part will be bent, so with a new end mill skim off arms until 1mm thick, then mill step, to form the yolk.
With another bigger dia slitting saw cut the link from the bar leaving plenty of meat around the arms for finishing later.
The second arm was just a repeat of the first, this is it being split off, I was a little lean on material, but their was just enough.
The links were flipped over and the other side end milled to size sorry no pics.
The hook was filed to shape.
I left them over long to give something to grip on only cutting them of to length as a last op.
Here's one finished with its mate.
And the finished bits assembled, they still need a bit of a clean up but not looking too bad. It will be fitted with some 3/8" phosphor bronze balls, when I work out a way to drill and tap them.
Stew
