Choose a job you love and you will never have to work a day in your life.....Confucius
Last edited: 22 September, 2012 - 08:43
Leosweeneypod Wrote:Hi Leon,The only Aquatimer with a baked-in fitting was the GST 3536. All others since, from 3538 to the current 3769, have the crystals friction fitted with Hytrel gaskets. The equipment for fitting the 3536 crystals is very specalized so this model is now always returned to the factory for servicing.The proceedure for fitting crystals with gaskets is relatively simple.The model specific synthetic case support and crystal die made by IWC are attached to a hand-operated press or potence, the case and crystal are inserted and carefully aligned and the press operated, driving the crystal into place while compressing the gasket.The watches are tested to their stated depth during manufacture to verify the strength of the case and components at that depth.During service they are tested to 10bar. As per the factory, this is more than enough to guarantee the continued water resistancy to the depth the watch is designed for. This is possible as the extreme thickness of the caseback and crystal prevent the watch from compressing by no more than a few microms at depth.As an extra security measure, the watch is also tested at a negative pressure of -0.5 bar to simulate the possible forces experienced when first entering the water.Leo
Last edited: 28 October, 2012 - 23:12
What you do may not be so important, but it is very important that you do it well. (my variation of a saying by Gandhi)
Last edited: 6 August, 2012 - 17:34
Last edited: 2 November, 2014 - 22:54
Leosweeneypod Wrote:Hi Leon,IWC's previous 200bar watch was the PD Ocean 2000. It was produced for about 4 years under the references 3500 3504 and 3524. The crystal seal composition at the time could not be guaranteed to withstand these depths, unlike the Hytrel gaskets now used. Many of the adhesives available at the time could not withstand the depths either and more importantly could not withstand the changes of temperature experienced. The kiln cured adhesive was found to offer security in all conditions.The 3536 used this method as it was well proven and the factory was already setup for this type of production. The crystals(and other components like the bezel gearing) are interchangeable on both PD and GST.The change to gasket fitted crystals is a further example of IWC utilising the latest technological advances in their watches. The production costs must be significantly lower for the same level of quality and the watches can now be serviced and resealed in your local IWC service center rather than having to be returned to Switzerland.LeoP.S. for RaveYou can safely take off the bandage. In 15 years of working on IWC's, I have Never seen a 3500 or 3536 leak through the crystal setting.