Model A - clutch dome screws

 I'm making these clutch dome screws, because whilst such screws are commonly available even as Ariel parts, they are usually 1/4" BSW to go into the later alloy primary cases. These black Ariels with tin primary cases use 1/4" CEI screws which I don't stock.

We'll make a set from this bit of 3/8" round bar:

I used the compound slide adapted for vertical operation to put the slots in the screws. They are cut with a 1/16" slitting saw.

Here are the first two. They still need the raised top shaping, but that will need the milling equipment removed from the lathe so we'll do all the others first.

A couple of days later, with the lightweight milling attachment removed we can put the radius on the screw heads using the form tool:

After that, I've used a piece of 240 grit wet & dry paper on a piece of wood to get rid of that copper plating - the bar I used to make these screws was an old earth rod. I don't think that the chemical blacking that I plan to use to finish these screws will work on the copper plate!

Lovely. Just what I wanted.