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  1. Charles E. Davis

    Square Pusher Broach

    John C. Losch answered this about 15 years ago. My notes from that answer indicated that he used a lathe with a lever fitted tailstock. He mounted the material for the hole in the headstock and drilled the maximum hole for the inside of the square. Then he locked the headstock with the indexing...
  2. Charles E. Davis

    Newbie question: clock strikes 4 minutes late

    Often you can put the tang in a small screw driver in the brass bushing hole and move the hand the four minutes. May take a couple of tries to get it on the money.
  3. Charles E. Davis

    Bent arbor

    It takes three hands! I generally open a vise and rest the ends of the shaft, not the pivots. on it, and rotate to find the highest point. In your case you need to apply taps from a punch next to the pinion. Keep repeating until it spins with no up or down motion. It takes three hands!
  4. Charles E. Davis

    Bushing Question

    Be very careful when you finally get that last push with the reamer. Stop turning immediately and pull straight out. You have to be sure to be upright as you get near the end of the reaming.
  5. Charles E. Davis

    Anyone have info?

    There would be several steps in getting such a clock. 1. Set up a pendulum spring support and find its beats per hour. 2. Find a beat up old German box clock which has the same beat. 3. Find a nice old very wide mantle clock to match your "T" bar pendulum. 4. Remove the movement and build the...
  6. Charles E. Davis

    Anyone have info?

    It is a special form of a pendulum and was used by some German clock makers. They were able to use that pendulum in a low-wide shelf clock with the same movement as used in their tall box clocks. It has a very slow beat. I have never found any literature on it.
  7. Charles E. Davis

    Hand Bushing Sources

    Time Savers has a wide assortment. I would assume that the other clock parts suppliers also carry them. I got an assortment in a glass tube a long time ago that has served me will.
  8. Charles E. Davis

    Mainspring winder needed for first few experiments?

    Marks clocks, New students questions are all very interesting, especially about tools. I have always tried to have all tools necessary for new students because my basic recommendation is "Do not buy any tool until you have used it and know you can't get along without it--and that goes for ckate...
  9. Charles E. Davis

    Mainspring winder needed for first few experiments?

    I started much like you are starting and got by fine with the hand unit for the price you mention. One drawback is that the inside clearance space for the click and click springs is not big enough diameter for American clocks. It needs to be opened up a little more, 1/8 or so. If you have access...
  10. Charles E. Davis

    Dimension of Bergeron and KWM bushing tool shafts

    The simplest way to solve your problem would be to rework the end of your broken shaft to accept a KWM style reamer. It would be easily done in a lathe with a three jaw chuck.
  11. Charles E. Davis

    Clock Key Size

    I scanned it as a jpg, but would still be interested in pdf of a word document. I added Charles's PDF file. Click on the black thumbnail. - shutterbug
  12. Charles E. Davis

    Clock Key Size

    I finally put together a chart listing numbers for different mms. Sorry I will have to try again. KEY SIZES FOR CLOCK AND WATCH WINDING Prepared for NAWCC Chapter 81 Clock Class. Pat Leung, Instructor mm Size American Swiss Watch 0.95 12 1.00...
  13. Charles E. Davis

    Seikosha drop octagon - wound too tight and other questions

    Unfortunately all of the good stuff is in Japanese which makes it tough for all of us who can't handle a foreign language, let alone one not in Roman letters. I have given the library a number of books that have been helpful to me. Unfortunately when I looked at their catalog it doesn't give...
  14. Charles E. Davis

    Seikosha drop octagon - wound too tight and other questions

    We always have to keep in mind that Japanese clock making out grew from the activity of domestic importers selling foreign clocks, the majority of which were made by Yankee makers. Naturally when they started to make them locally they didn't mind if people thought they were still those great...
  15. Charles E. Davis

    Seikosha drop octagon - wound too tight and other questions

    This clock is typical of many you find. It has a had a long life and been through many peoples hands. Three over-pasted dials is not unusual and the one you pictured is often used in paper replacements. Only the original dial will give any clue to the original company that produced the clock. An...
  16. Charles E. Davis

    "re-goldening" powder?

    Like recoloring statues the easiest method is using "Rub'nBuff" or Treasure Wax. It is a wax like mixture used like shoe polish that you apply with a rag dampened with turpentine. It dries into a hard finish that is like a metallic thin coat of paint. One other approach is to take gold silk...
  17. Charles E. Davis

    Bushing Issue

    I generally advise clamping a small piece of brass next to the edge of the hole while doing the reaming. Seldom will it go to the edge and there is no chance of expanding and weakening that part
  18. Charles E. Davis

    Anyone Have the 'Key' For This Line Diagram?

    The diagram is from R. E. Swan's book, sheet 21. It is Wm. L. Gilbert. He gives pretty much generic names. Everybody pretty much has their own set of names that they understand and use. Probably come from whoever taught them of the book they learned from. Maybe we need a committee to settle it...
  19. Charles E. Davis

    nuts for Gilbert movements

    Here is part of two pages from Illustrated Catalog G of Ducommin of LA and San Francisco printed in 1926. They show the early standards for fractional and machine screw sizes up to 30. The 7 size is 0.1510 midway between 6 and 8. The 9/64, 0.1406 and the 5/32 , 0.1563 are also between 6 and 8...
  20. Charles E. Davis

    Making helper springs

    The ones I have made said to put a crank on one end and slot the other end of the wire. Place the shaft between a fold in a cardboard when you wound up the spring. This keeps it nice and tight but it still will expand to come off. The secret is the nice brass spring wire you use.

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