Thin collet for lantern chuck

[thehomeengineer]

Hi All
I needed to thread some 3/16” diameter x 1/4” long round head brass rivets 7BA to hold the baffle plate angles to the side plates of the water tank for my 3”scale Foden steam wagon.

I made a lantern chuck a few years back to thread 1/4 diameter copper rivets 2BA for stays for the boiler which were considerably longer.

To machine the short and smaller diameter rivets a small collet was machined so there was enough protruding out to be threaded but still allowing the chuck to clamp the rivets.

Photos below show the results

Photos showing both sides of collet.

Collet loaded into the front of the lantern chuck.

Rivet held and tailstock die holder fitted with 7BA split die to cut thread.

Completed rivet’s

thank you for viewing
The Home Engineer