Screw Cut in Pocket Watch Jewel Setting

[jdrichard]

Need some help. I just finished my 3rd shot at making a raised setting to replace a gold setting on a ball Pocket Watch 3rd wheel upper setting. I made the setting out of brass and stilled the outer lip after all the other work. The setting sits perfectly in the plate. The original setting has small cut-ins in the setting to allow the two screws to screw in flush with the plate. How can I make these little 1/3 moon cut-ins?  Here are some shots of the settings and my really messy desk:) now clean.  I also made a YouTube video to show all the work. I’ll past the link in the video section.

[nickelsilver]

You need a piloted counterbore. Bergeon sells sets but I doubt they have a corresponding size, they are easy to make and described in several books. It's a 10 minute lathe and file job.

[jdrichard]

On 4/4/2021 at 12:47 PM, AlexanderToerzs said:

Hi JD,

You use them like any other countersink when you need a spherical countersink. Place over the hole and turn between your fingers. Re-bushing or re-jeweling is one example when you need to make a spherical countersink to hold the oil.

Cheers and happy Easter from Hamburg

Alex

p.s. not meant that way but occasionally I use them free hand on the t-rest on the lathe to cut palm tree like grooves on a piece of 5mm brass rod to later serve as a handle for small tools. For Centre punches, hand levers and the like. Works like charm.

 

20 minutes ago, nickelsilver said:

You need a piloted counterbore. Bergeon sells sets but I doubt they have a corresponding size, they are easy to make and described in several books. It's a 10 minute lathe and file job.

Any ref material

[oldhippy]

A spot face drill bit. Believe it or not I got mine from a dentist.  

[jdrichard]

On 4/2/2021 at 8:44 AM, toptime810 said:

I got it from eBay it’s the white color

 

48 minutes ago, oldhippy said:

A spot face drill bit. Believe it or not I got mine from a dentist.  

I’ll have a look, thanks OH

[jdrichard]

20 hours ago, nickelsilver said:

You need a piloted counterbore. Bergeon sells sets but I doubt they have a corresponding size, they are easy to make and described in several books. It's a 10 minute lathe and file job.

Found the reference in one of my books, Bench Practices for Watchmakers.

[nickelsilver]

Exactly, I was pretty sure Fried showed it. If you want to get fancy you drill it rather than turning the pivot, then you can fit any size pivot for a counterbore.

[jdrichard]

5 hours ago, nickelsilver said:

Exactly, I was pretty sure Fried showed it. If you want to get fancy you drill it rather than turning the pivot, then you can fit any size pivot for a counterbore.

I was thinking of drilling it but wanted to get this job done. Next time perhaps. I also put a video on YouTube , reassembling the Ball Waltham made watch and putting in the setting screws. Big success with the jewel setting and the resulting amplitude and beat error of the movement. Next job is soldering dial feet:)