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About dadistic

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    Super WRT Addict

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    Chicago, Illinois

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  1. Hello! Hope you like heat, I hear it's a bit brutal this summer. There's a section where you can post about your collection, pictures would be great! I'm sure you can get some advice on any issues you have.
  2. Hi, and welcome. Lost of folks around here who are willing to give a bit of help and advice when needed. Have Fun!
  3. Hello! Welcome!
  4. Nope. They are metric. That's the neat thing about the Unified Miniature Thread screw series, metric and imperial are the same. But they really are metric screws with the pitch sometimes shown as inch dimensions. If you can find a UK supplier you will be ahead of the game.
  5. Yes, Waltham and Elgin were making screws long before there was anything like a standard screw size. It wasn't just a marketing thing!
  6. This is what I get for trying to do this at work in my spare moments, confusion! This is the Internal Thread Min. Minor Diameter for the UNM (not UMT) miniature thread series - 0.217,0.256,0.296,0.346,0.370,0.420,0.444,0.518,0.592,0.666,0.740,0.840,0.940,1.088 So, a series of "go" (plus) pins might run like this - 0.22 - 1.10 in 0.02 increments. There is for example - M0MMP - plus .22 to 1.50 in .02 increments for a total of 65 pieces from Meyer Gage that cost about US $100.
  7. Whoops! It just occurred to me that if you are using a pin to measure a threaded hole, you are actually measuring the minor diameter of the thread, so the 0.30 pin won't go in a UMT size 0.30 threaded hole. The minor diameter is smaller.
  8. Ok, since I'm at work, I grabbed one of our copies of Machinery's Handbook, and looked up the Unified Miniature Thread series. This series consolidated the American and Metric screw sizes in 1955. At least the ones used in instruments and watches. I also looked up what was included in the Swartchild pin set. All in mm - Swartchild .07 - .19 in .01 increments .20 - .40 in .05 increments Unified .30 - .55 in .05 increments .60 - 1.10 in .10 increments 1.20 and 1.40 So, consolidated it is 0.07 - 0.19 in 0.01 increments, 13 sizes 0.20 - 0.55 in 0.05 increments, 8 sizes 0.60 - 1.10 in 0.10 increments, 6 sizes 1.20 - 1.40 in 0.20 increments, 2 sizes All together that's 29 pins, not a large set. That will take you out of the instrument and watch sizes into the standard sizes. Maybe add a few larger sizes in 0.20 increments, and, depending on how small they go, a few smaller in 0.01 increments to fill out the set. Does this help?
  9. This is great! I don't have a set for watches for the very reasons you mention. How big of a set are you looking at? When I get home tonight I can put together a range of (metric) sizes that I think would be useful. I'd like to get down to jewel hole sizes, do you know how small your supplier goes?
  10. Pin gauge sets are still made, just not specifically for watchmakers any more. The most common sets you will find will be with larger sizes that a machinist would find useful. If you want to see what a watchmaker's set looked like, search for - Watchmakers Swartchild's Cylindrical Metric Jewel Gauge No. 51836 This set was sold for measuring jewel holes, but you can get an idea of what they look like, and the larger sizes are certainly useful for screw holes.
  11. Hi, and welcome! My English isn't very good either, and English is my native language Don't worry, please contribute, we will figure it out. Have Fun!
  12. Well, if you want to know the size of a hole, the easy way to do it is with a pin gauge. They come in a set, little cylinders of known size, You see which one goes in the hole, and that is your size. For the screws, as @rogart63 says, measure with a caliper. Vintage pin gauge sets made for watchmaking show up on the bay every once in a while. When I'm sorting an unidentified set of something, I just start dividing into big/little, or short/long, or something like that, and keep dividing until each size is in its own little group. If I then want to know an actual size I will compare against a known example. If I want to know thread pitch, for example, I might hold a screw up to a tap to see if the threads are similar. Not hard, just tedious. I have to be in the right mood to tackle some of my junk piles :-)
  13. When I regulate my own watches, I do dial up and crown down, and try and get it so that the watch will run a tad fast.
  14. I have one of these, it seems to work well. I have not had the luxury of being able to compare it with other models. These machines are available with different brand labels, Weishi, TYMC, sometimes they are sold with no brand at all. Ace Timer 1000
  15. I think you did well. Should clean up nicely!