Where are the jewels used in auto movements?
Like Tree9Likes

Thread: Where are the jewels used in auto movements?

Page 1 of 2 1 2 LastLast
Results 1 to 10 of 17
  1. #1
    Member
    Join Date
    Sep 2010
    Posts
    2,390

    Where are the jewels used in auto movements?

    And is the rotor pivot point typically one of the jeweled areas?
    Thanks for any info.

  2. #2
    Member
    Join Date
    Oct 2013
    Posts
    1,375

    Re: Where are the jewels used in auto movements?

    1: Impulse jewel (the part of the balance wheel assembly which receives a kick from the escape lever)
    2-5: Balance staff pivot bearings (two pairs - in combinations of one pivot jewel (i.e. jewel with a hole to receive the axle (pivot) of the wheel) and one cap jewel (i.e. jewel without a hole outboard of the pivot jewel, to prevent excessive movement of the balance staff), usually shock protected)
    6-7: Escape lever pallets (one pair)
    8-9: Escape lever pivot bearings (one pair)
    10-11: Escape wheel pivot bearings (one pair)
    12-13: Fourth wheel pivot bearings (one pair)
    14-15: Third wheel pivot bearings (one pair)
    16-17: Center wheel pivot bearings (one pair)
    18-19: Add 2 cap-jewels on the pallet
    20-21: add 2 cap-jewels on the escape wheel.
    22-23: add 2 mainspring barrel jewels
    Current Collection:
    Rotary, Adina, Emporio Armani, Loyal, Swatch, Ingersoll, Cyma and others...

    The Wanted List:
    Citizen NB0030-01A

    Realistically Achievable Grails:
    Breguet 5817 Marine Big Date
    Grand Seiko STGR003

    Holy Grails:
    Breguet 5617 Perpetual Calendar Chronograph

  3. #3
    Member
    Join Date
    Dec 2014
    Posts
    91
    Quote Originally Posted by TimeWizard View Post
    1: Impulse jewel (the part of the balance wheel assembly which receives a kick from the escape lever)
    2-5: Balance staff pivot bearings (two pairs - in combinations of one pivot jewel (i.e. jewel with a hole to receive the axle (pivot) of the wheel) and one cap jewel (i.e. jewel without a hole outboard of the pivot jewel, to prevent excessive movement of the balance staff), usually shock protected)
    6-7: Escape lever pallets (one pair)
    8-9: Escape lever pivot bearings (one pair)
    10-11: Escape wheel pivot bearings (one pair)
    12-13: Fourth wheel pivot bearings (one pair)
    14-15: Third wheel pivot bearings (one pair)
    16-17: Center wheel pivot bearings (one pair)
    18-19: Add 2 cap-jewels on the pallet
    20-21: add 2 cap-jewels on the escape wheel.
    22-23: add 2 mainspring barrel jewels
    just exactly what type of "jewels" do they use? Ruby? I see red in my Baume Mercier caseback.

  4. Remove Advertisements
    WatchUSeek.com
    Advertisements
     

  5. #4
    Member
    Join Date
    Oct 2013
    Posts
    1,375

    Re: Where are the jewels used in auto movements?

    Quote Originally Posted by AweSam8 View Post
    just exactly what type of "jewels" do they use? Ruby? I see red in my Baume Mercier caseback.
    Lab grown corundum with a chromium impurity. Most people would call that ruby (indeed the two are chemically identical) but the crystal structure of the lab grown variety is totally different to natural ruby. It's is used because it's cheap to manufacture, hard, and provides the lowest friction for the lowest amount of money. Lab grown diamond would technically be better, but lab grown diamonds are still more expensive than lab grown rubies. Plus rubies look nice. Blue lab grown corundum is also seen in a few watches.
    Last edited by TimeWizard; January 24th, 2015 at 05:03.
    Current Collection:
    Rotary, Adina, Emporio Armani, Loyal, Swatch, Ingersoll, Cyma and others...

    The Wanted List:
    Citizen NB0030-01A

    Realistically Achievable Grails:
    Breguet 5817 Marine Big Date
    Grand Seiko STGR003

    Holy Grails:
    Breguet 5617 Perpetual Calendar Chronograph

  6. #5
    Member
    Join Date
    Sep 2010
    Posts
    2,390

    Re: Where are the jewels used in auto movements?

    Thanks - are any of those what I'm referring to as the rotor pivot (probably not the correct term)? In other words, the weight that swings to wind the watch? I'm asking because that seems like it would likely be a wear-point, particularly if the rotor is at an angle to its pivot point. It's quite possible my understanding of how things work is incorrect. The 7750 "wobble" seems to discount my concern about the strength or possibility of undue wear at this pivot point. If the rotor can spin like that without causing undue wear leads me to believe that either it is protected from wear or a bit of "slop" in this area isn't an issue. Thanks again, and I apologize for my probable incorrect usage of nomenclature. Any reference material recommended, like maybe an autos for dummies? I don't need to become a master, but a basic understanding would be nice. Right now my knowledge level is "look at the pretty moving things - cool!"

  7. #6
    Member lysanderxiii's Avatar
    Join Date
    Oct 2006
    Location
    N 32 deg, 47' 27.9168"; W 79 deg, 54' 30.3372"
    Posts
    8,842

    Re: Where are the jewels used in auto movements?

    Quote Originally Posted by TimeWizard View Post
    1: Impulse jewel (the part of the balance wheel assembly which receives a kick from the escape lever)
    2-5: Balance staff pivot bearings (two pairs - in combinations of one pivot jewel (i.e. jewel with a hole to receive the axle (pivot) of the wheel) and one cap jewel (i.e. jewel without a hole outboard of the pivot jewel, to prevent excessive movement of the balance staff), usually shock protected)
    6-7: Escape lever pallets (one pair)
    8-9: Escape lever pivot bearings (one pair)
    10-11: Escape wheel pivot bearings (one pair)
    12-13: Fourth wheel pivot bearings (one pair)
    14-15: Third wheel pivot bearings (one pair)
    16-17: Center wheel pivot bearings (one pair)
    18-19: Add 2 cap-jewels on the pallet
    20-21: add 2 cap-jewels on the escape wheel.
    22-23: add 2 mainspring barrel jewels
    The last two (22-23) are not usual, and rarely, if ever seem on 23 jewel watches, except Chinese ones. For the conventional hand-wind layout you have listed, the 22 & 23 jewels are cap jewels for the 3rd wheel.

    Most automatics do not use that layout (in fact, all common ones found in $5000 and cheaper watches). They stop at 16 or 17 on your list.

    The remaining jewels are distributed through the automatic winding mechanism. Sometime a jewel, or pair of jewels can be used at the rotor axle, but not always. These days most companies prefer to use a ball bearing. The 7750 used a ball bearing.
    TimeWizard likes this.
    familiaritas parit contemptum; raritate admiratione wins.- Lucius Apuleius
    est necessry, accurate ad secundo? - Lysander magna
    iustum est horologium - Obscurus Genius

  8. #7
    Member
    Join Date
    Sep 2010
    Posts
    2,390

    Re: Where are the jewels used in auto movements?

    How about ETA movements and Maurice Lacroix? Is there somewhere I can find this info? I have Miyota 9015, Seiko NH36, ETA 2824-2(?), and Maurice Lacroix either 15 or 115 - forget which.

  9. #8
    Moderator at Large stuffler,mike's Avatar
    Join Date
    Mar 2010
    Location
    The Hague-Amman-London-Berlin
    Posts
    50,207

    Re: Where are the jewels used in auto movements?

    The ML 115 basically is a SW 200 which is an ETA 2824-2 with just one more jewel. Search WUS for more info. All described in detail.
    Kind regards
    Mike


    Instagram @mikestuffler

  10. #9
    Member
    Join Date
    Sep 2010
    Posts
    2,390

    Re: Where are the jewels used in auto movements?

    I tried searching, but the results were overwhelming. Any specific search terms to learn more actual details rather than the more common questions such as "ETA versus xxxx?"

  11. #10
    Moderator at Large stuffler,mike's Avatar
    Join Date
    Mar 2010
    Location
    The Hague-Amman-London-Berlin
    Posts
    50,207

    Re: Where are the jewels used in auto movements?

    Just one...and yes it is a ....vs....thread explaining the " extra" jewel.

    ETA vs Sellita - number of jewels question

    The fact that the ML 115 is basically a SW 200 was already reported in 2010: Maurice Lacroix: Sonderedition mit Fliese
    Kind regards
    Mike


    Instagram @mikestuffler

Page 1 of 2 1 2 LastLast

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

    Similar Threads

    1. Seiko Frankenmonster Auto. (23 jewels mechanism)
      By Flash Gordon in forum Seiko
      Replies: 5
      Last Post: April 29th, 2011, 18:45
    2. Stowa Auto movements
      By dcfis in forum Jörg Schauer & STOWA
      Replies: 3
      Last Post: December 8th, 2008, 23:58
    3. FS: Eska Auto 21 jewels (reduced)
      By jres11 in forum Watches - Private sellers and Sponsors
      Replies: 0
      Last Post: April 13th, 2008, 00:04
    4. auto & auto chrono movements on the bay
      By gigfy in forum Chinese Mechanical watches
      Replies: 7
      Last Post: April 9th, 2008, 05:13

    Posting Permissions

    • You may not post new threads
    • You may not post replies
    • You may not post attachments
    • You may not edit your posts
    •