Jump to content

Seiko 6309a Pallet Fork Problems

Dave84

By Dave84
in Watch Repairs Help & Advice

 Share

Recommended Posts

Dave84 Watch Enthusiast

Dave84

Posted
Posted

Hi guys,

I have been working on my first full strip down and service of an old 6309a I picked up. 

When reinstalling the pallet fork, I am noticing that when I put a turn of power to the mainspring to test the fork in its position that its not locking the escape wheel and instead pivoting back and forth uncontrollably at high speed for a second until it runs out. I have also tried to reinstall it a few times but keep getting the same results. I am assuming that have damaged something ... :unsure:

Any advice appreciated 

Thanks 

Dave 

IMG_20200222_174810.jpg

Link to comment
Share on other sites
jguitron WRT Addict

jguitron

Posted
Posted

The pics looks alright as far as I can tell. Tough with just one pic but I’d say it shouldn’t be doing that. 
 

given my own mishaps, I have to ask without meaning any offends... is it possible you placed the fork upside down and so the stones are not at the same level as the escape wheel and hence free spinning? Or is the escape wheel placed incorrectly? All teeth ok?

 

keep us posted!

 

Julian 

 

Link to comment
Share on other sites
Dave84 Watch Enthusiast

Dave84

Posted
  • Author
Posted

Hi Julian- no worries, it is something id likely do, but no i checked its in correctly. the escape is sat within the pivots and moving freely. 

Nucejoe - I didn't actually clean the pallet fork, but I did notice that the jewels were sat pretty deep in the fork and they might not be connecting properly with the escape wheels. 

Link to comment
Share on other sites
watchweasol Distinguished Member

watchweasol

Posted
Posted

Hi  on this one I would side with nucejoe  It looks and sounds like the the pallet jewels are set wrong and mislocking on the escape wheel. Watch closely the action of the pallet, apply a small amount of power and watch how the jewels lock, control the release of the power with some peg wood.  Do not run the watch at speed as it may break or chip the jewels.  one answer is to obtain another pallet and try the same tests as re setting the jewels whilst not impossible will be time consuming and may not achieve the desired results.

Link to comment
Share on other sites
Nucejoe Distinguished Member

Nucejoe

Posted
Posted

I take it you manually clean pallets. So I make a habit of dropping the fork in bath of avgas and gently brush (soft brush) pallets alot. 

I think more friction and drag come to the play during escape teeth run on the face of pallets , than all other low tension components combined. Good clean and proper lube on a good pallet face is your ticket to good amplitude.

Escape teeth scratch pallets face especially if dry, so I make a habit of routinely  checking pallet face under high magnification. 

But in this case, I am affraid replacing complete fork with a good one is your best option. Watchweasol once called pallet adjust a minefield, everyone agreed.

 

Link to comment
Share on other sites
 Share
Go to topic listing


  • Recently Browsing

    • No registered users viewing this page.

  • Topics

  • Posts

    • 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.
    • DDean
      Incabloc Lyre Spring & Low Earth Orbit

      By DDean · Posted

      So I just wanted to say "thank you" again.  The angle is the key bit it seems and yes, it did basically just fall, or float, back into position when I got it lined up just right. I had meant to add that now that I see how it goes in, I totally see how it came out in the first place, and that whomever cloned the original movement didn't pay much attention to the fine details around the setting or how it interfaces with the balance cock or the "rings" on the regulator and/or stud carrier arms.
×
×
  • Create New...