Jump to content

Shaving a Jewel

jdrichard

By jdrichard
in Watch Repairs Help & Advice

 Share

Recommended Posts

jdrichard Distinguished Member

jdrichard

Posted
Posted

I fit a jewel into a plate. It is a Seitz 30/200 (.3mm hole and 2mm diameter). The problem I have is that the jewel is too thick and I think touches the pinion on the third wheel where it’s installed. Is there a way of shaving material off a seitz jewel? Perhaps on a lathe with 2000 grit sandpaper or a burnishing file. Don’t know???? Help!

 

 

Sent from my iPhone using Tapatalk Pro

Link to comment
Share on other sites
  • 2 weeks later...
 Share
Go to topic listing


  • Recently Browsing

    • No registered users viewing this page.

  • Topics

  • Posts

    • doober
      Rado rotor removal

      By doober · Posted

      Hi! I am in the process of restoring a rado captain cook mkII. I want to remove the rotor, but I am not sure how to and need some help. As you can hopefully see on the photo there are 2 screws. The left one has two positions, the right one looks like a regular screw. I have tried turning the right one, but it does not give even after using more force than I would expect. Anyone know the function of the left screw with the two positions and how to remove the rotor? Thanks!!
    • Randy55
      Introduction

      By Randy55 · Posted

      Welcome to the group Stirky. You can search for just about every subject in the craft here. Don't be afraid to ask if you can't find the answer that may have already been covered ( some ad nauseum LOL ). You don't have to buy Bergeon to get good quality. There are many decent mid-range tools available that will last you a lifetime. Cousins would be a good place to start . Cheers from across the pond ! Randy
    • Jon
      What are these Seitz B-Jewels?

      By Jon · Posted

      I picked up a similar amount of these jewels some years ago in a watch and clock fair. Every now and then they come in handy. This week I've got a rubbed in bombe jewel in the balance cock that is cracked and needs replacing. Very handy to have a vintage assortment of these type of jewels!
    • Stirky
      Diagram for 6497 motion works

      By Stirky · Posted

      Thanks Jon.
    • Jon
      Diagram for 6497 motion works

      By Jon · Posted

      Great diagram with the teeth and pinion count. Simple way to reduce the speed of the hour wheel by the 12:1 minute wheel. Genius and yet so simple. Always good to reinforce the principal by what you have done in your drawing. Keep doing that. I had a drawing on my wall for years showing me this which is very similar to the drawing you have done. Here's a formula to work out the beats per hour of a watch movement. The movement's BPH is dictated by the wheel teeth and pinion count and the hairspring being vibrated to the correct BPH by finding the pinning up point on the hairspring using a vibrating tool.  The reason in the formula there is X2 on the top line is because there are two pallet stones.
×
×
  • Create New...