Results 1 to 3 of 3

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

  1. #1
    OptiBoard Apprentice gsmahesh's Avatar
    Join Date
    Jul 2010
    Location
    Kuwait City, Kuwait
    Occupation
    Lens Manufacturer
    Posts
    35

    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...!!!??

  2. #2
    OptiBoard Apprentice gsmahesh's Avatar
    Join Date
    Jul 2010
    Location
    Kuwait City, Kuwait
    Occupation
    Lens Manufacturer
    Posts
    35

  3. #3
    OptiBoard Apprentice gsmahesh's Avatar
    Join Date
    Jul 2010
    Location
    Kuwait City, Kuwait
    Occupation
    Lens Manufacturer
    Posts
    35
    can anybody advice?

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. temperature affect transitions??
    By Yeap in forum Smart Lens Technology by Transitions Optical
    Replies: 3
    Last Post: 12-09-2009, 02:13 AM
  2. Chamber Temperature for Transitions
    By Samuel Jong in forum Smart Lens Technology by Transitions Optical
    Replies: 4
    Last Post: 06-07-2006, 10:24 AM
  3. Play Station 2 At Just $130usd, Play Station 1 At Just $100usd
    By jackson john in forum General Optics and Eyecare Discussion Forum
    Replies: 0
    Last Post: 04-30-2006, 07:57 AM
  4. Temperature
    By chip anderson in forum General Optics and Eyecare Discussion Forum
    Replies: 4
    Last Post: 11-29-2002, 01:38 PM

Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
OptiBoard is proudly sponsored by:
Younger Optics and Vision Equipment