I'm really sorry to double-post this, but I forgot this forum existed until somebody else mentioned it. Here's what's already been discussed in the other forum:
http://www.optiboard.com/forums/show...546#post317546
So I've got a Ultraoptics Mini II coater that we've had absolutely no trouble with until about 2 months ago. All of a sudden, most Sola Transitions 1.50 SV and FT lenses were developing either little chips or very small "dents" in the center of the lenses after the wash/dry cycle (before coating). We haven't had any trouble with polycarb or regular CR39. All of the chips/dents were within a central 1.0 cm of the lens (meaning at the OC of the lens). I can assure you the lens is not hitting the wash/dry heads or coating nozzle.
We fine on low speed for 2:15 with a 7-leaf 3M 15 micron 1-step pad from PSI, we polish for 4:00 on low speed. We really haven't changed anything except for switching from IPA for the wash cycle to deionized water but that was about 3-4 months before we started having trouble with the chips. DragonLensmanWV suggested we polish for 6 minutes for the Transitions 1.50 lenses, could that really make a difference?
Since we have no trouble with polycarb and CR39 and we've always used Sola's Transitions 1.50 products, I'm starting to think we've run into a bad batch of products.
Or perhaps there's simply too much pressure being used by the coater. Is there a way to modify how much pressure the Haskell pump puts out?
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