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Pallet Jewel Broken Watch Doesn't Run Screw too Long |
Pallet Jewel broken |
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| The lever is not
subject to repairs; it is one of the longest lasting parts of a watch,
and especially a pallet jewel will never break. But it happens: The example watch (movement in Fig. 1) was designed for eternity. Despite its age (made 1925) it was in decent shape: Neither corrosion, nor noticable wear, just minor marks as inevitable after many services.
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Diagnostics The amplitude (oscillation width) of the balance was unsteady, and between different positions the speed varied several minutes per day. If speed is varying due to damages of wheels it repeats periodically depending on the revolutions of the causing wheel. If variations are erratic, usually a failure of the escapement is the reason. Fig. 2 shows a pallet jewel with chipped off edges and planes, considerably compared with a new (on the left). The pallets are cut and arranged to draw them into the escape wheel. This keeps the fork away from the balance roller, reducing friction, as indended for a detached lever escapement. Such a damaged jewel can't do this job. The lever fork slips over the roller, causing variing position errors and amplitudes. Moreover the top surface was damaged. As this surface transmits energy from the escape wheel to the balance, only a reduced erratic fraction of the energy is available for the balance. No need to know or understand all these details. Simply imagine that nobody would cut and arrange the jewels so precisely, if an unshaped pebble could do the job. |
| Repair | What Could Have Happened? |
| Unfortunately the
repair is troublesome and expensive: 1) The parts are tiny. The jewels shown magnified here are just 0.22mm wide. 2) Replacements are available in all widths, but varying lengths would let stock keeping efforts explode. So the replacement must be shorted to matching length - not easy for such a midget. 3) Appropriate tools (heating plate, adjustmend aid) must be purchased, but are scarcely used because usually the complete lever is replaced. So the costs have to be distributed over few repair jobs. ![]() Fig. 3 In Fig. 3 the new shorted pallet is mounted, and the old damaged aside. The result is astonishing: The speed became steady as expected, but the position errors even grew bigger, but were now constant for every position. |
1) The watch was since long out of
fashion, when the owner wanted to
have it repaired as cheap as possible. The uncle of a friend of the
neighbour's daughter was an expert for lawn mowers, first
choice though. 2) He started with correcting the pallet position with pliers - for dubious reason. Pallets withstand the beats of escape-wheel teeth eternally, but not the zillionfold power of the pliers. 3) The watch still refused to die, but ran with small amplitude and big position deviations. 4) Unfortunately one can suspect that it was a watchmaker: The position deviations were compensated by a tiny correction washer under the correct balance screw, and by increasing the play of the hairspring between the curb pins of the regulator - procedures not actually common for hobbyists. And indeed, the increased position error after replacement of the jewel was gone after removing the improper compensation measures, mentioned in 4). No idea about the origin of this disaster. Remarkable that replacing the jewel brought the movement back to a performance as new: A maximum position deviation of 20s/day is good for such an old watch without shock device. Remember that chronometers from present production may have 10s/day. So nothing ever "happened" to the watch by usage; it was simply damaged by a repairer. |
| Figures (cf. Service Prices) | ||
| EUR 10.00 removing and
reinserting movement,
hands, and
dial EUR 60.00 replacing the pallet EUR 15.00 removing the improper position error compensation EUR 85.00 total (in 2010) |
Acceptable for such an outstanding
gold watch. For a watch of
moderate value one can only hope to find a complete lever or a donor
movement for some bucks. Regardless what was the reason for this destruction, the work was too expensive, even if free of charge.
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Screw too Long |
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| ebay seller: renram,
item: 120475436924: schöne Herrenuhr Etern a Centennaihe Closed: 10-11-2009, for EUR 86.00 No functional deficits mentioned.
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Diagnostics The reality: At midnight the watch stopped running. If set further, the date advanced. The quickset didn't work. Tiny cause, huge (and expensive) consequence: A screw is lost and nobody creeps hours on the floor the find it, since replacement is no problem. Take a matching screw, and watch what is going on with its end, because the end may lead to damages. The first indicator for tinkering: A missing screw at A in Fig.1. Not actually professional, since the manufacturer had good reasons to mount the rather thin date plate with four screws. Without date plate the reason for the not working quickset was visible: The date corrector B was missing (in Fig.2 already added). But even with the added corrector the quickset didn't work, because the date plate was seriously distorted. |
| What Has Happened | |
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Near the date
jumper D the
end C of a too long screw
stuck out (Fig.3). Not fatal at the first glance.
But if a tooth of the date disk pushed the jumper D to the
right, its spring E passed the end
C of the screw
(Fig.4). Still no problem without the date plate, but with the plate screwed on, above C no space is left for the spring E, and the jumper D got stuck. The Crap Approach Since the date stuck with tightened date plate, the screw over the date jumper D was left out. As the date still remained a bit sticky it was operated by quickset until the teeth of the date disk were enough deformed to pass the sticky jumper now and then. |
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Fig. 5 |
The tiny (in Fig.5 strongly magnified) date corrector B works usually eternally. But it is operaded via even more tiny rods on its bottom, and these surely didn't resist this treatment, and broke. So this part was left out - no urgent need for a quickset feature though. A good repairer imagines that a watch properly worked when leaving the factory. And if there is any malfunction, he only must care for restoring the original state. The approach of a tinker is completely different: He tinkers until the watch functions any how - or simply not. |
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Back to the Roots After cleaning and lubricating, and with replaced date disk, -plate, and -corrector the movement presents in the shape it had before the tinker touched it. The date disk is not the same as before, but there were various models, and 50 years after the birth of the watch on can be happy to find any. Moreover the silvered disk matches the silvered dial beter than the white. |
| Figures (cf. Service Prices) | |
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| EUR 10.00 removing and
reinserting movement,
hands, and
dial EUR 8.00 partial disassembling to replace the too long screw EUR 20.00 diagnostics, disassembling and assembling date mechanism EUR 6.50 date corrector EUR 14.50 date disk EUR 18.60 date plate EUR 77.60 total (in 2010) |
These are only the costs
directly caused by the too long screw. Additionally the opportunity was
taken to clean and lubricate the movement. It was to a certain extent
disassembled anyway, and one should make sure that not more was
damaged, and that no swarf from the date disk will stop the watch. Regardless what was the reason for this destruction, the work was too expensive, even if free of charge.
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Watch Doesn't Run |
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Fig. 1Magnify images by clicking them |
ebay seller: harrybr67,
item: 230466699214: Alpina Taschenuhr Closed: 05-02-2010, for EUR 35.50 Original text: "Leider läuft sie nicht. Ich habe keine Ahnung wieso nicht, da ich die Uhr nicht aufbekomme. Deshalb verkaufe ich die Uhr ausdrücklich als DEFEKT." (Unfortunately not running. No idea why because I can't open it. So I sell the watch explicitely as DEFECTIVE.) The Apparent Beauty Fig.1 shows a watch in perfect shape, without any visible marks of usage Regarding the exterior shape, an experienced collector expects as worst case a broken balance staff. Price, shipping charge, and replacing the staff would then add to a total of some EUR 120.00, an attractive price for an n.o.s. watch from about 1940. And with some luck it would have been the famous little something, and this made this gambling reasonable. |
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Fig 2 |
The Ugly Reality After opening the back it became obvious why the watch didn't run: Instead of a movement, Fig.2 shows a plate especially made for display dummies, with drill holes for the dial feet, riveted posts A for the hands, and a spring B holding the stem in place. The dummy plate is even designed for several calibres, as the center punches C for other drillings indicate. The Problem This is no watch, just a dummy. A normal seller would have said: "Sorry, my mistake - return it". Or he would have negotiated a fair price for the case and the dial. But it is possible to turn an error to fraud: Refering to his item description (I mentioned that the watch doesn't run), he refused any agreement. Not respected own advice: Never buy a watch without movement photo.
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Back Can't Be Opened |
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ebay seller: wein1939,
item: 230315529178: Universal Geneve 1969 Closed: 12-26-2008, for EUR 197.89 Original text (translated): "Runs accurately....sorry, unable to open the back...". Fig.1 shows the watch in April 2011, but except a crystal with some tears it looked similar in 2008. And in fact, even with all my expensive case-opening equipment I couldn't open it either - I even broke off the handle of a matching wrench for this back. O.k., the timing machine displayed a straight line - no sign of wear at all, and the appearance held what the seller's photos promised. No reason not to give a positive ebay feedback, and to put the watch aside for later solving the problem. A year later I remembered this fine timepiece, and first time applied a super-special opener (Fig.2): A sufficiently heavy lathe, a plastic bobbin, a wooden block, a hammer. This opens almost everything without remarkable opening marks. |
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No Surpise Fig.3 shows the reason for the bomb proof back: It was glued with epoxy adhesive. Real Surprise Fig.4 shows that the back was not sealed because a part of the gasket was missing, but to prevent anybody to look inside too early after the purchase - and this actually worked. The complete micro-rotor assembly was missing, and I'll never understand why such a valuable watch was butchered that strange way. The rotor assembly is almost indestructable, with its tungsten carbide weight and its ball bearing. The missing parts are therefore almost never needed, and accordingly nowhere available, at least not for an effordable price. |
Fig. 5 |
The Solution Fig 5 shows the only solution: The missing parts would be available anywhere in the world, and for one part this troublesome approach is reasonable. But here several parts were needed. So the only way was to search for a movement or a donor watch. Still not easy, but managable if one watches the market continuously anyway. But this still lasted another year, due to the following reasons: 1) The Universal 69 belongs to the rarer calibres, compared with the predecessors 215, 218 or the sucessor 1-69. 2) Most bare movements come from gold cases without efficient protection for the movement. Many are therefore corroded. And as the movement of this watch was in clean shape, the replacment, or at least the needed parts shoud be in comparably good condition. 3) Due to dried out parts supply for these movements, even rusty trash is expensive. However, a movement, even one in still better condition was found, and after a service implanted into the watch. |
| Figures (cf. Service Prices) | |||
| EUR 202.39 uncomplete watch
including shipping EUR 101.00 bare movement including shipping EUR 54.00 standard service automatic EUR 9.00 additionally for date EUR 12.50 crystal, plastic round, reinforced EUR 4.00 replacement back gasket EUR 382.89 total (in 2011) |
A bit much, but with fresh service
and guarantee still acceptable (not calculating all the hassle). As
this transaction provided
movement photos and data for the archive, and as the replaced
uncomplete movement can wait for future use, the achieved price needs
not cover all costs. However, the watch was sold, and the high bid fortunately covered all costs, but of course not the invested work; but this can be regarded as hobby. Not respected own advice: Never buy a watch without movement photo.
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...the alternative - free of charge! |
Dr. Roland Ranfft Im Eichfeld 8 41844 Wegberg-Wildenrath Germany |
phone +49 (0)2432 491604 fax +49 (0)2432 491605 email: info@ranfft.de |
Last update: 09-07-11 |