yenfoolun 進階會員 
註冊時間: Jan 17, 2007
文章: 485
來自: Kuala Lumpur, Malaysia
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發表於: 星期日 2009-05-24 01:23
小弟一直都在找一只适合每天佩戴的计时表！简单实用就好了！阅读过了不少网站，最后买了一只RXW Plasmir Milgraph，1000m防水，三锁入式龙头，超强的三文治+h3夜光面盘，厚实表壳，表链+connoly 表带！几乎完美！然而过了几个月，由于习惯了大表，40mm总是觉得小了些，最后卖了给更懂得欣赏它的同事
几个月没有一个日常佩戴的计时码表，还是不爽，于是有在网上收集资料，结果向来一只 omega professional, 刚好上星期友人说可以用特价购得全新的omega speedmaster professional from moon to mars
可惜迟了一部，让人捷足先登！
然而幸运之神还是将到我身边，终于看到有人可以出让他的 DAMASKO DC 66
，它的二手身价比特价全新的 omega from moon to mars 还高！
有人问我，为何一个以eta 7750机芯的旧表为何让我欣喜若狂？
昨天，它终于来了
表壳 -
• 42mm damasko的ice hardened 白钢，据说比sinn的表面加强tegsimented更强，更硬，而且是整体的，不会有鸡蛋壳般效应！
• 保证硬度达60 HRC or 710 Vickers
• 设有防磁内壳，80,000 A/m or 100 mT
• 更精准的锁入式龙头
• 龙头和计时码按钮也一样加强至 60 HRC
• 厚度Overall height: 13.70 mm
• 表耳Lug width: 22.00 mm
• 重量Weight without strap: 106 grams
表圈
• diameter : 43.80mm
• 双向旋转，加强的钻石表圈，想挂花也难！
防水
• 10 bars/100 metres
• 锁入式表背配上最好的 Viton™ o-ring gasket
• Viton™ 超强防化学反应的胶圈
• 龙头和计时码按钮用上了 permanent lubrication cell which eliminates friction.
表镜
双面防眩，非常易读，然而容易挂花，我这二手表就有几条刮痕！但是只有小角度能看到
• 蓝水晶表镜的 gasket 防 UV radiation
• 也设有防压
面盘
• 黑面白字，一贯的德国简洁风格
• c1夜光
指针
c1夜光
我的德国制造排排坐
我的年度表
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Rolex SD YMii
Panerai
PP 5711 AP RO
UJ 1150
Breguet tradition
Etc
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yenfoolun 進階會員
註冊時間: Jan 17, 2007
文章: 485
來自: Kuala Lumpur, Malaysia
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發表於: 星期日 2009-05-24 01:29
The Watch Case
It has always been one of our major goals to design a watch case with superior resistance against scratches, knocks, and general wear, but the materials commonly available, including the rather soft titanium definitively do not feature the necessary characteristics. The term 316L describes the kind of steel which is predominantly used in the watch industry. It features good corrosion resistance but is also relatively soft. Occasional knocks with a watch made from this material will often lead to serious scratches or dents.
Although there is the possibility to harden the surface of 316L (1.4435) or 1.4301 up to 1200 Vickers by diffusing carbon into the top layers of the steel, there is no way to temper the material. Due to the austenitic structure of the alloy it is impossible to make sure that that steel remains its hardness throughout the body.
Various tests have proved that this kind of surface treatment is not suitable for our purposes because it only hardens the top layer of the metal. This leads to the so-called egg-shell effect. We were able to dent and scratch the “hardened” surface with an ordinary pair of tweezers (which are normally made from spring steel) because the material underneath the hard layer was not able to withstand the pressure.
Due to the reasons described above we searched extensively for better alternatives. In 1994 after five years of research we took out patents for 20 closely related martensitic sorts of stainless steel which highly exceeded our expectations. They are absolutely nickel-free, offer a good corrosion resistance, and can be tempered up to 64 HRC/800Vickers which is four times the hardness of every other steel currently used in the watch industry.
What makes this material so special is the fact that the molten steel is enriched with 0.35% nitrogen under high pressure. Nitrogen and carbon are responsible for the hardness of the alloy. Under normal circumstances it takes about 1% of carbon to temper a martensitic steel up to 60 Rockwell but the low nitrogen content of our steel only requires 0.35% of carbon to achieve this superior hardness and in addition to that leads to an excellent corrosion resistance which is many times higher compared to other temperable martensitic steels. Due to the special process of hardening we call this steel “ice-hardened, nickel-free stainless steel”. This material is patented for our applications and Damasko makes exclusive use of this pioneering material.
The entire watch case, including hardened crown and pushers is designed, engineered, and machined at our factory near Regensburg. Until the end of 2002 we supplied our cases to a well known German watch brand but from now on these cases will only be available through Damasko.
After the special heat treatment mentioned above our steel reaches a maximum hardness of 62 Rockwell which makes it superbly scratch-resistant. You have to search hard to find a common household item ( apart from a sapphire nail-file or a brick) that is able to scratch the case.
Due to its superior performances this steel was mainly created for aeronautical use in:
- ball bearings for jet-engines
- rotor bearings for helicopters
- fuel pumps of the “Space Shuttle”
- high-speed bearings in CNC lathes
- dental and surgical instruments
The Gasket System
The main operating elements on a chronograph are the crown and the pushers. The crown is used to set the correct time, and in case of a mechanical wristwatch to wind the movement. The pushers are used for starting, stopping, and resetting the chronograph functions of the watch.
These operating elements basically consist of the visible piece of the crown and chronograph button and a shaft which connects them to the movement.
One of the major problems we had to face during the construction of our new crown and pusher system was to find a solution to seal the operating elements against the ingress of moisture and dust. Conventional systems make use of two O-ring gaskets made from an elastic material such as Nitril™. The longevity of these gaskets is to a large extend determined by the quality of the material and the friction between the stem and the O-ring. This friction factor increases the wear and ultimately leads to worn out and leaking sealing elements.
After extensive research we found a solution to the problem – our lubrication cell. Once again the concept for this unique element is a miniaturised design derived from industrial engineering. The lubrication cell is basically a tube made of our patented hardened stainless steel which is screwed into the drill holes for the crown and the pushers. The cell is filled with a synthetic viscous lubricant and sealed with two innovative Viton™ elements which prevent the filling from leaking or migrating.
The lubricant fills the microscopic surface roughness of the polished crown and pusher stem and eliminates friction and wear. Our lubricant system offers a longevity of gaskets and operating elements which is second to none.
The Case inside the Case – The Magnetic Field Protection
Every Damasko watch features an important technical detail which is not visible at first sight but has a major influence on its accuracy under harsh conditions – the anti-magnetic cage.
Only very few mechanical pilot’s watches are equipped with this feature. The unique inner case consists of the dial, the movement retaining ring, and a second back. These parts are made of a special material with anti-magnetic characteristics which is able to withstand magnetic fields with a strength up to 80,000 A/m. They are machined with maximum precision to ensure an exact fit and to prevent the escapement from being magnetically charged.
The Patented Crown
During the development of our new crown we had to face the fact that literally every current crown system that works on a basis of a decoupling screw-down crown has two major weak spots that may sooner or later result in a defect.
The reason for that is to be found in the positive-fit coupling elements of the crown. They often consist of a fairly weak hexagon bolt which with1mm width across flats. Another reason for a defective crown mechanism is the wrong choice of material. Most watch manufacturers still make use of brass, German silver, or rather soft stainless steel (see “The Watch Case”). this leads in many cases to chamfered corners of the hex bolt which makes a form fit almost impossible. In such a case you would neither be able to wind the movement by hand nor to set the correct time.
Many watch manufacturers seem to be aware of this problem and use an inferior coupling crown which is permanently connected to the movement.
The wrong choice of materials described above also sometimes results in ruined and worn out threads of the crown mechanism which also impacts the water resistance of the watch.
After extensive research we developed a decoupling screw-down crown which is constructed according to standards derived from mechanical engineering. The use of a hex bolt with 2mm width across flats and the fact that the entire crown, including shaft, thread etc. is made from our patented hardened steel (60-62 HRC) results in a longevity which is second to none.
All gaskets of the new crown system are made of Viton™, a material with high chemical and mechanical resistance which is superior to every other gasket material (Nitril etc.) currently used in wrist watches.
Crown and pushers are also equipped with our patented lubrication cell which ensures a smooth action and lubricates the shaft and the gasket. The tubes of both crown and pushers are, according to industrial engineering, screwed into the case using a special key. Almost every other watch manufacturer makes use of an inferior press fit tube.
Our new crown system is patented.
The oil-free escapement
For over 100 years the Swiss Anchor Escapement has been the most precise and reliable escapement for wrist- and pocket watches. In order to work properly it needs to be oiled regularly on the palettes and on the teeth of the escape wheel and in addition to that, watch manufacturers recommend to service a mechanical movement every 2-3 years by disassembling, cleaning, and lubricating it. An insufficiently oiled or even dry escapement ultimately results in bad accuracy or even worse, in worn out parts.
Since 1998 Damasko has experimented with different kinds of coatings which should lower the friction coefficient between anchor and escape wheel. Latest technological achievements showed that coatings made of various layers of amorphous carbon (Diamond Like Carbon/ DLC) are probably the most advanced solutions to create a dry escapement. The process to generate such a layer is called Plasma Activated Chemical Vapour Deposition (PACVD). Apart from its black colour the coating features the following characteristics:
- Extreme hardness of approximately 1800 – 3000 Vickers
- Excellent wear resistance
- High chemical resistance
- Superior surface quality
- Extremely low friction coefficient. DLC – Steel: 0.07 (without lubricant)
- Movements parts can be coated at a temperature that does not affect the structure of the metal (< 200 degrees)
This coating process was originally designed to increase the wear resistance of moving engine parts, cutting tools, and even medical implants. In addition to the hardness and wear resistance of the layer, the extremely low boundary friction coefficient makes this method of coating so interesting for us.
We started by coating the escape wheel of the ubiquitous but reliable ETA 7750 with amorphous carbon. As mentioned above, the combination of the ultra-hard carbon layer and the polished synthetic rubies (AL203) of the anchor already lead to a very good boundary friction coefficient, which allowed us to construct an escapement which works fine without any lubricant at a daily accuracy of approximately +- 2 seconds. Furthermore the escapement delivered an amplitude of 290-325 degrees, which is already very good.
But we thought that the combination of DLC on DLC should deliver even better results. We went one step further and designed an new one-piece anchor with a modified geometry and slightly different parameters. After polishing, tempering, and again polishing this anchor was also DLC coated and fitted to the movement. The result was absolutely amazing! Due to the extremely low friction coefficient of DLC on DLC the escapement delivered an amplitude of 300 – 347 degrees without any lubrication. Of course this was only a test run. In order to make sure that this result will also be achieved during serial production it is necessary to establish an effective quality control.
After two years of extensive testing on different movements, no signs of wear can be regarded and the escapements still deliver excellent amplitudes.
During our latest test run we replaced the synthetic rubies of the anchor by palettes made of silicon carbide and found out that this innovative material is another outstanding friction partner for the DLC coated escape wheel.
Boundary friction coefficients of the most important material combinations:
- DLC – Steel: 0.07
- DLC – Synthetic ruby: 0.05-0.06
- DLC – DLC: 0.04-0.05
- DLC – SiC:0.03-0.04
- For comparison the traditional, lubricated escapement:
Steel – Synthetic ruby (oiled): 0.05
The results of our research and the use of new materials for the escapement are patented.
All in all it is clearly visible that our efforts on this field have led to a major progress and for the near future we will put our main emphasis on the design of a completely oil-free movement.
Since the publication of our latest patent specifications there were several attempts to copy our technical solutions, this is the reason why these pages only contain very generic information on how our oil-free escapement works.
In 2001 our company started another test run with specially prepared movement plates. On these parts the drill holes that support the gears are DLC coated on their inner surface to eliminate friction. In addition to that we also decided to coat the inner surface of the main spring barrel. Although we are still in the middle of another extensive test phase the movements already work excellent and the treated parts show absolutely no signs of wear. We are confident to present a completely oil-free movement in a relatively short period of time.
_________________
Rolex SD YMii
Panerai
PP 5711 AP RO
UJ 1150
Breguet tradition
Etc
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71CWI 資深會員 
註冊時間: Apr 28, 2009
文章: 541
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發表於: 星期日 2009-05-24 08:03
nice introduction..though i am too ignorant to understand...^^
thanks anyway. 
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沒有什麼是可以保值的
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Agni 初級會員 
註冊時間: Apr 21, 2009
文章: 27
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發表於: 星期日 2009-05-24 18:01
看起來是一隻強悍的手錶,恭喜大大..
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judydad 資深會員
註冊時間: Jun 28, 2007
文章: 687
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發表於: 星期日 2009-05-24 22:14
強悍又與眾不同的一隻錶！
感謝分享！ 
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錶如故人，有去有來！
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yenfoolun 進階會員
註冊時間: Jan 17, 2007
文章: 485
來自: Kuala Lumpur, Malaysia
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發表於: 星期一 2009-05-25 08:54
若单单轮造型，我更喜欢sinn的757
个人觉得面盘和表圈都比较美
但是dc66的钻石表圈，强化的表壳，还有那比很多独立制表师的年产量更少的稀有量（几年前推出至今只有百多枚）让我把持不住！
_________________
Rolex SD YMii
Panerai
PP 5711 AP RO
UJ 1150
Breguet tradition
Etc
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Agni 初級會員
註冊時間: Apr 21, 2009
文章: 27
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發表於: 星期一 2009-05-25 20:37
大大那9點鐘方位的指針是什麼??
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yenfoolun 進階會員
註冊時間: Jan 17, 2007
文章: 485
來自: Kuala Lumpur, Malaysia
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發表於: 星期一 2009-05-25 23:51
| Agni 寫到: | | 大大那9點鐘方位的指針是什麼?? |
7750 的小秒针！
sinn 把它拿掉了！只有计时码秒针！
_________________
Rolex SD YMii
Panerai
PP 5711 AP RO
UJ 1150
Breguet tradition
Etc
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yenfoolun 進階會員
註冊時間: Jan 17, 2007
文章: 485
來自: Kuala Lumpur, Malaysia
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發表於: 星期二 2009-05-26 17:53
戴了4天，保持每天+2秒！
据说damasko用的都是cosc级的机芯！
加上特制的dlc马仔和莲花轮,因该能耐多几年吧！
_________________
Rolex SD YMii
Panerai
PP 5711 AP RO
UJ 1150
Breguet tradition
Etc
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