Rolex COMEX Skrev:hannover_dk Skrev:...............Selv urmagere er det ikke.
Vrøvl siger jeg! Der er da ikke én eneste professionel der med respekt for sig selv eller sit fag, vil påstå at et ETA 2892 – selv i den IWC modificerede ugave, er et bedre værk end et Rolex kal. 31xx eksempelvis.
Jamen så er det jo bare sådan, godt vi fik det slået fast - surt at der er mere end en opfattelse blandt mange andre - men de er jo bare vrøvlehoveder
ex lidt her som ikke tager så voldsomt stilling, men som giver lidt af forskellene. Jeg siger ikke at IWC's er overlegen - slet ikke - blot at der er flere meninger, og at det ikke altid er så let bare at sammenligne værker som du gør det til.
Ud over den jeg har kopieret ind, kan man læse denne, ikke helt useriøse gennemgang af simpel 2892 a2 mod rolex - og igen - alt skal jo tages med et gran salt - men det er ikke så enkelt som du vil gøre det Rolex COMEX-. Jeg ved godt jeg ikke flyttet en mm på din opfattelse, men der er jo mere end lige os to med i sådan en tråd.
Taler vi holdbarhed enkelt lavet - tror jeg også jeg hælder til rolex, men det er ikke alt -
http://www.chronometrie.com/rolex3135/rolex3135.html
Movements:
Rolex cal.3135:
The Rolex uses the cal.3135, which has 31 jewels, 28800vph, 50-hour power reserve and automatic winding in both directions. The 10mm free-sprung balance wheel is supported by a balance bridge and is adjustable in height, fine adjusting is done by the 4 “Microstellar”-screws in the ballance wheel. The cal.3135 measures 28.5mm in diameter and is 6mm high.
Rolex sends all cal.3135 movements to COSC for certification, they send in the movement without the winding-bridge and date mechanism. After certification the movement is further completed and again regulated to tighter tolerances than initial used by COSC and the movements are fitted into the watchcases. Final testing include (again) accuracy, automatic and manual winding and power reserve.
IWC-30110:
The caliber used in the Aquatimer is the IWC-30110, introduced in 2003 to replace the IWC-37524. The IWC-30110 is an extensively reworked ETA2892A2 caliber with 28800vph, 42-hour power reserve and automatic winding. The ETA2892A2 derives from the 18000vph 28mm ETA2890 movement, and is reduced in diameter to fit into smaller cases. The 9mm-balancewheel is supported by a cock and has an “Etachron”-fineadjustment. The ETA2892-A2 is 25.6mm in diameter and 3.6mm high.
This caliber is delivered to IWC in parts in its finest grade (chronometer-grade) that ETA delivers. Then IWC improves the caliber with new/better parts, and Nickel-plates and decorates it. The 'standard' ETA2892A2 has 21 jewels, IWC adds 2 jewels (mainspring-barrel), amongst other improvements like replacing the date-mechanism and reducing the diameter of the ball bearing of the rotor to increase winding efficiency. These improvements made by IWC throughout the complete movement makes the movement run so efficiently that the mainspring has to be replaced by a less stronger one.
IWC does the assembling and regulation completely in-house. When the watch leaves the factory, it is tested for 21 days and runs within +0...+7 sec/24H, which is a tighter tolerance than used by COSC.
Rolex cal.3135 vs. ETA2892A2:
Big advantage of the ETA2892A2 is that it is a strong movement capable of taking various sorts of modules like chronograph-modules and calendar-modules. Here it also helps that the base-movement is relatively thin, so a chronograph based on this movement doesn’t have to be thick, like the Girard Perregaux F300 Chrono or the Omega Speedmaster reduced for instance, which both measure 12mm in height.
The movement is readably available to other companies and this makes it (like the Rolex) a high volume movement, parts will be available for a long time and servicing is common and easy and doesn’t require certain skills or specific parts for a watchmaker to have. The ETA-movement is easily capable of running within the COSC-specifications and it’s available from ETA in different levels of finishing and specifications.
Rolex has a few cornerstone-principles on which their movements are designed and build; accuracy, durability and ease of service. They use a minimum of movement-parts and these components are relatively large, this makes the cal.3135 about 40% thicker and 10% wider than the ETA2892A2 is. Larger components result in a more robust movement that will take ‘abuse’ more easily than a movement which consists of smaller and more delicate parts.
One of the reasons for the Rolex’s cal.3135 superb winding efficiency is the pivot-pin used to support the winding rotor, the weight spins on a smaller diameter pivot pin versus the larger ball-bearing used on the ETA2892A2. This increases the torque on the Rolex to wind the mainspring. But, the downside of the pivot-pin in the Rolex is that the rotor is more sensitive to shocks, which occasionally can make the rotor hit the movement-bridges. Although this is a known fact, I personally haven’t seen any damage caused by this, not even onto very old, never serviced, movements. But there is a very good review of this movement on Timezone.com done by Andrew Babanin, which does show some damage.
A few features of the Rolex cal.3135 compared to the ETA2892A2:
- A balance bridge that supports the balance assembly, secured by screws at two points onto the movement, versus a cock that is cantilevered and supported by a single screw used onto the ETA2892A2.
- The balance bridge of the cal.3135 also has height adjustment screws to accommodate adjustment of the balance staff's end-shake, making the job of setting this tolerance easier and more precise.
- The balance wheel of the cal.3135 is protected from inadvertent contact with the rotor during a severe shock by a curved bridge that's mounted to the top plate adjacent to the balance, in fact, there is no essential part in the movement that can be hit by the rotor in case of severe shock, all parts are ‘protected’ by either bridges or plates.
- The (well-known) red anodized reverser-gears perform perfectly for years with no lubrication, also due to the high torque the rotor delivers to wind the mainspring.
- The balance of the cal.3135 is free-sprung, this means that the timing of the watch, once regulated, won't change because of a severe shock, where a pin regulated escapement (like on a ETA2892A2) can have its index 'slip' during a severe shock, throwing its timing off by several seconds per day.
- The design of the pivot shape for the cal.3135 balance pivots is tougher than the standard conical pivots. This does however require tighter tolerances to function properly, hence the balance adjustment facility.
- Fine adjustments in timekeeping can be made using the 4 “Microstellar”-screws fitted onto the balance wheel.
![[-]](https://urdebatten.dk/images/collapse.png)
