Making a Replacement Screw for a Micrometer Using a Watchmaker's Lathe

In this video I use my new Wolf Jahn Geneva-style 8mm Watchmaker's Lathe to make a replacement screw for one of my micrometers. This was my first time ever making anything on the lathe.

chapter index:
00:00 introduction to the micrometer
03:56 removing the broken screw
04:35 overview of the project including the Martin & Fils screw plate
05:49 testing the graver I recently sharpened on the 4mm steel rod
06:39 cutting the workpiece with a vintage graver
16:42 cutting with a new Glardon Vallorbe graver
19:20 using the Martin & Fils 48 B screw plate to thread the screw
21:10 removing some additional material from the workpiece
23:57 creating the thread with the screw plate
29:10 testing the new thread on the micrometer
33:37 deciding to remove some additional material under where the screw head will be
33:50 overview of how I plan to cut the slot in the screw head
35:55 removing additional material on the lathe to make the screw longer
37:01 cutting the screw head free from the stock
38:13 using the lathe to cut the slot in the screw head
41:10 admiring the finished screw
41:58 testing the final result in the micrometer
44:44 reviewing all of the tools I used to make the screw
48:15 a note about the messiness of the lathe tailings and how to control them
50:03 conclusion and thank you!

Here's an affiliate link for the steel I bought for this project:
https://s.click.aliexpress.com/e/_DBGU7wv

And here's a link for Dave's Watch Parts (where I sourced the Martin Fils screw plate):
https://www.daveswatchparts.com

If you're interested in the variable speed brushless DC servo motor that I have attached to my vintage watchmaker's lathe that was a purchase on AliExpress and cost $98 not including shipping.

Here's an affiliate link for that:
https://s.click.aliexpress.com/e/_DkLT5xP

I bought the 800W Kit, which includes the motor bracket.

I also bought the two v-belt pulleys you can see mounted on the motor's 14mm shaft separately:

smaller pulley (mounted closer to the motor in the video):
https://s.click.aliexpress.com/e/_DD2MTxP (select W4 O30 suit 4mm belt and specify bore size of 14mm to seller in message)

larger pulley (mounted on the end of the drive shaft in the video):
https://s.click.aliexpress.com/e/_De0TtwN (select Bore Diameter: 14mm, Width: 40mm)

You only need one pulley, and I recommend the smaller one even though it costs a bit more as it fits the 4mm belts better. I ordered two because I was not sure that the larger, less expensive one would work. It works fine but the belt can slip from side to side.

#watchmaker #restoration #watchrepair #watchrestoration #tools #comedy #lathe
Here's an affiliate link for the steel I bought for this project:
https://s.click.aliexpress.com/e/_DBGU7wv

And here's a link for Dave's Watch Parts (where I sourced the Martin Fils screw plate):
https://www.daveswatchparts.com

If you're interested in the variable speed brushless DC servo motor that I have attached to my vintage watchmaker's lathe that was a purchase on AliExpress and cost $98 not including shipping.

Here's an affiliate link for that:
https://s.click.aliexpress.com/e/_DkLT5xP

I bought the 800W Kit, which includes the motor bracket.

I also bought the two v-belt pulleys you can see mounted on the motor's 14mm shaft separately:

smaller pulley (mounted closer to the motor in the video):
https://s.click.aliexpress.com/e/_DD2MTxP (select W4 O30 suit 4mm belt and specify bore size of 14mm to seller in message)

larger pulley (mounted on the end of the drive shaft in the video):
https://s.click.aliexpress.com/e/_De0TtwN (select Bore Diameter: 14mm, Width: 40mm)

You only need one pulley, and I recommend the smaller one even though it costs a bit more as it fits the 4mm belts better. I ordered two because I was not sure that the larger, less expensive one would work. It works fine but the belt can slip from side to side.

#watchmaker #restoration #watchrepair #watchrestoration #tools #comedy #lathe