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Thread: What is the minimum temperature for PRA blocker's blocking station.

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    OptiBoard Apprentice gsmahesh's Avatar
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    Exclamation What is the minimum temperature for PRA blocker's blocking station.

    We are using Satisloh PRA blocker since 7 years. Recently our surfacing technician has come up with a compliant that lens power variation is due to low temperature of the blocking ring area(blocking station). Then we have done the experimental process for two days as follows.
    • First day with very low temperature-near to zero degree, we have blocked more than 200 lenses.. that day we have got the power rejection in 2 lenses(not sure if it is due to the low temperature)
    • Second day we set the blocker station temperature to normal, same quantity of lenses have been blocked then we have got the power variation in 4 lenses.


    Still my doubt is not cleared, is it really possible that powers can change if the blocking station temperature is very low !!!?

    I know if we increase the alloy temperature more than the required, there is a chance to get the curvature changes in lenses. But decreasing the temperature...!!!??

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    OptiBoard Apprentice gsmahesh's Avatar
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    OptiBoard Apprentice gsmahesh's Avatar
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    can anybody advice?

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