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syfre last won the day on February 12

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About syfre

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  1. Yes, the alligator clip has been modified , it works much better than i thought, but i tried pocket watch hairspring only. Also i used an old croco clip which was originally shaped differently than the chinese ones you can find on the bay.
  2. Hello guys, An attempt to make a low cost hairspring vibrating tool : Prove of concept : The hairspring (here it's a 18s balance) is clamp in a crocodile clip which has been grinded to be as fine as possible, a laser beam is set so that the beam is cut by the balance arm. The photo diode (from an old pc mouse ) is en-capsuled in a little housing to avoid parasite light (from what i thing to be an old TO3 transistor spacer found in my spare screws box). The IC is just a simple op amp acting as a comparator, the led on the output is used to visualize the that the laser beam is on the detector. First measure on scope : Doing some simple math show that an error of 0.1 ms on the measured value (which is 400 ms for 18000 bph) correspond to an error of 21.5 seconds / day. At that time base setting my scope has a resolution of 4 ms ! I switched to an Arduino based measuring system : I used an existing Arduino module based on a cheap stm32 and add a led (indispensable to adjust the beam) and the power output for the laser. The comparator is no more required as the stm32 has schmitt trigger inputs. The soft is triggered by the touch screen and accumulate a couple of measures in a circular buffer to compute an average value. This permits to eliminate aberrant measures that you can have when the balance starts to swing. Detail of the crocodile clip : In conclusion this is little tool (cost me only the plexyglass sheet, around $1.5) could be useful to match a new hairspring on an existing balance. The measures are relatively simple to do with a good consistency and surprisingly the croco clip do the job and you can get the balance swing for tens of second on the plexy. You need a resolution of 0.05 ms to be at 10 s/d and probably calibrate your measuring device. The main difficulty was to adjust the position of the laser beam. Hope this can give you some ideas. Regards
  3. Pivot Size V's Jewel Size

    look at this post : there is a pivot gauge with the Jacot ; an other option is a good micrometer (a mitutoyo for example) with 1/1000 resolution
  4. Pivot Size V's Jewel Size

    pivot size are measured in 1/100 of mm ; example a pivot of 18 means 0.18 mm ; you need a jewel hole just larger than the pivot ; example for a 0.18 pivot you need a 0.20 jewel hole Also : to measure a pivot you need a pivot gauge or a (good) micrometer; you need measurement at 1/100 of mm. Have a look here :
  5. Need Stem for 18S Elgin Pocket Watch

    I don't like these case because of that, easy to broke the stem but you can fix it ; drill the stem in the center, make the hole two or three time deeper than the diameter of the hole turn a new square in steel with a round plug, adjust the plug until it enter the hole, a little drop of loctite and voila.
  6. Timing Adjustment Problem

    Assuming the staff is not broken and that the hairspring don't touch anything, check that you don't have a cracked jewel. Don't see exactly what you mean by a "fair amount of slop" but balance jewels are convex type jewels (with olive hole), see here But, this not explains why your regulator has no effect. If you swap the hairspring there is a fair amount of chance that it's not matching the balance and becomes impossible to regulate. In this case you need to adjust the balance weight.
  7. Regulator Pins

    I agree with oldhippy about the regulator but in my opinion it's not the problem in this case, even with regulator pins pinching the hairspring the regulator must have some action ; if not there is a pb elsewhere, like hairspring touching the balance cock or balance arms or something like that.
  8. Replacing Jewels

    this is for balance hole jewels, and you don't need a jewellers set tool to put these back; except if damaged train jewel don't need to be removed.
  9. 1.9ms beat error is (very) good for these watch, personally i will not touch it.
  10. Replacing Jewels

    Why do you want to replace it ? don't see any problem in your picture. It's look like a 23j Waltham so it's a valuable watch. As oldhippy says changing a jewel is not so obvious ; second the method described is for friction jewels (the modern type) and these Waltham used jewels in setting (the jewel is burnished in the setting) . In the old time they were plenty of available parts and the watchmakers can replace easily the setting. Nowadays finding a replacement is a hard job. In my opinion, replacing the setting by a friction jewel, even if it can be done, is not a good idea as this will drop the value of this watch. The best option is to find a donor movement.
  11. French Benrus Mark IV

    The R148 is very popular in France because of the Lip Nautic-ski which is a collector R148.htm
  12. The problem is that the mainspring slips on the barrel wall ; not at the arbor This is a picture from Chicago School ; look here, sec 171 :
  13. what you have is a Waltham motor barrel, the problem is at the other end, the spring slips at the barrel hook. The end of the spring must be shaped to match the barrel wall, some explanation here :
  14. Elgin Size 0 Still Won't Run

    Check the hands
  15. Happy to tick again estimate production year : 1872