Jewel chuck

[LittleWatchShop]

I have had these for a long time. I believe they are jewel chucks.

How di I use them?

[nickelsilver]

These typically fit in a 5mm collet, and have adjustable depth stops. They are used to hold the setting that takes the jewel for doing lathe work; these jewels-in-settings are most often seen in American made pieces.

[LittleWatchShop]

14 minutes ago, nickelsilver said:

These typically fit in a 5mm collet, and have adjustable depth stops. They are used to hold the setting that takes the jewel for doing lathe work; these jewels-in-settings are most often seen in American made pieces.

OK, so once the jewel setting is installed in the chuck (plus #50 collet), then what?  Do you use a graver to cut out the jewel?

[nickelsilver]

You could do that. Most would use a slide rest for this work; quite often it would be used to put a step on a setting, modify the diameter/s seat height etc. Also useful when making new settings. All depends of course on how true it runs (the ones I've encountered haven't been great).