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Post by popeye on May 31, 2015 0:44:12 GMT -8
Advice please
New member to the forum so I hope I am not asking a really dumb question
These seem to be an interesting range but I understand they have plastic components in the calibre which are prone to wear
How fragile are these movements and how easy to have repaired if I do hit problems
Many thanks for any guidance
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Adrian-VTA
Global Moderator
Adelaide, South Australia
Posts: 5,327 
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Post by Adrian-VTA on May 31, 2015 1:00:42 GMT -8
The movements are AWESOME and are near COSC spec, the wear issue comes from the day/date quickset wheel, which cracks and are long since unavailable. We are working on a project to come up with a replacement part but we're not there yet. I can do a "fix" on them to get them working again if yours has the issue but you'll need to supply me just the part to keep the cost down. That said, the day/date quickset is not essential to timekeeping, so besides that, they are a really nice and highly accurate movement. Advice please New member to the forum so I hope I am not asking a really dumb question These seem to be an interesting range but I understand they have plastic components in the calibre which are prone to wear How fragile are these movements and how easy to have repaired if I do hit problems Many thanks for any guidance |
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cobrajet25
Needs a Life!
"Underweared curmudgeon!"
Posts: 3,357
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Post by cobrajet25 on May 31, 2015 1:05:45 GMT -8
The part in question is the "day/date rocker", which is part of the day/date quickset mechanism. It has a plastic gear that is press-fit onto a metal hub, and this plastic gear is what drives the daywheel and date ring when they are set. The purpose of this arrangement is to allow the gear to slip on the hub if the quickset is used when the day/date are changing over around midnight, thus avoiding damage to the movement. Unfortunately, the plastic they used back then isn't quite as stable as the plastics used nowadays, and the gear shrinks a bit with age. When a plastic gear set on a metal hub shrinks, it cracks. Once cracked, it loses tension, can't grip the metal hub anymore, and the quickset does not work. Other than this, they are really nice movements. Be sure to get one with a working quickset and you should be fine. Lord Matics don't tend to sell for very much, partly because of this "Achilles' Heel". Here is a pic of the part that fails...  |
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Adrian-VTA
Global Moderator
Adelaide, South Australia
Posts: 5,327
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Post by Adrian-VTA on May 31, 2015 1:08:03 GMT -8
And if you do get one with a working quickset, NEVER use it between 9pm and 3am, as that is the area that puts the most strain on the part. The part in question is the "day/date rocker", which is part of the day/date quickset mechanism. It has a plastic gear that is press-fit onto a metal hub, and this plastic gear is what drives the daywheel and date ring when they are set. The purpose of this arrangement is to allow the gear to slip on the hub if the quickset is used when the day/date are changing over around midnight, thus avoiding damage to the movement. Unfortunately, the plastic they used back then isn't quite as stable as the plastics used nowadays, and the gear shrinks a bit with age. When a plastic gear set on a metal hub shrinks, it cracks. Once cracked, it loses tension, can't grip the metal hub anymore, and the quickset does not work. Other than this, they are really nice movements. Be sure to get one with a working quickset and you should be fine. Lord Matics don't tend to sell for very much, partly because of this "Achilles' Heel". Here is a pic of the part that fails... |
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Post by sundog on May 31, 2015 2:50:12 GMT -8
And if you do get one with a working quickset, NEVER use it between 9pm and 3am, as that is the area that puts the most strain on the part. The part in question is the "day/date rocker", which is part of the day/date quickset mechanism. It has a plastic gear that is press-fit onto a metal hub, and this plastic gear is what drives the daywheel and date ring when they are set. The purpose of this arrangement is to allow the gear to slip on the hub if the quickset is used when the day/date are changing over around midnight, thus avoiding damage to the movement. Unfortunately, the plastic they used back then isn't quite as stable as the plastics used nowadays, and the gear shrinks a bit with age. When a plastic gear set on a metal hub shrinks, it cracks. Once cracked, it loses tension, can't grip the metal hub anymore, and the quickset does not work. Other than this, they are really nice movements. Be sure to get one with a working quickset and you should be fine. Lord Matics don't tend to sell for very much, partly because of this "Achilles' Heel". Here is a pic of the part that fails... Cobra and Hal0: This is the type of knowledge share that is awesome!!! |
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Post by popeye on May 31, 2015 3:03:07 GMT -8
I doubt there is anywhere else you could ask that question and get such knowledge and advise
Thank you all very much and you have set me off on my next project
If I track one down I will post so you can view the results of your guidance
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HiBeat
Global Moderator
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Posts: 8,684
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Post by HiBeat on May 31, 2015 10:52:37 GMT -8
Also too, for a novice, be careful with "Open through glass" style cases. It gets a lot harder to repair and properly re-install the crystal.
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Adrian-VTA
Global Moderator
Adelaide, South Australia
Posts: 5,327
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Post by Adrian-VTA on May 31, 2015 16:09:40 GMT -8
You need a crystal claw or a S-14 tool to open these. The movements are usually in better condition in these cases though as they've been sealed a lot better than a case with a caseback. Also too, for a novice, be careful with "Open through glass" style cases. It gets a lot harder to repair and properly re-install the crystal. |
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Post by popeye on Jun 4, 2015 23:03:24 GMT -8
Thank you for your advice and I have now received fresh from Japan a simple 25 jewel 5605 7020 Lord Matic from the 60s which is stunning
I will post some pictures when I get time to do it justice
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