Unknown Brass tool with steel wheel on each end

[Juec]

Hi,

Can anyone tell me what these tools are please? 

Thanks in advance

Julie

[HectorLooi]

These are oil sink cutters. They are for countersinking pivot holes to create an oilsink.

[Juec]

HectorLooi, thanks very much for your answer. Much appreciated.

[spectre6000]

2 hours ago, HectorLooi said:

These are oil sink cutters. They are for countersinking pivot holes to create an oilsink.

I'm sure this makes perfect sense to most people, but I'm not totally following. Is this for unjeweled pivots? Are they used like a spoon drill?

[Plato]

There's a good example of them in use here at 7:30 min:

 

[HectorLooi]

These would be used mainly on clocks, pocket watches and unjewelled plates.

[Klassiker]

They are used to countersink any holes, not just for making oil sinks in unjeweled holes. As you can see in Dean's video above, he has given the jeweled centre hole a decorative chamfer around the jewel, and he has also chamfered the screw holes. It makes an attractive contrasting surface finish and a neat transition from one surface to another.

[jdrichard]

8 hours ago, Juec said:

Hi,

Can anyone tell me what these tools are please? 

Thanks in advance

Julie

These are for rounding the edges of jewel settings or jewel holes on plates. You simply stick it into the hole and then twist it in a circle grinds off the edge without an issue You simply stick it into the hole and then twist it in a circle grinds off the edge without an issue

[Juec]

Thanks for the replies and video. The video made it really easy to understand their purpose.

[spectre6000]

So, yeah. Spoon drill. I'm often amazed at the extreme duality of high/low tech in horology...