Hello,
We recently started having a problem just with poly semi-finished lenses. After the polishing step, we de-block the lenses and they have random, somewhat circular scratches on the backside.
The problem only happens with poly.
We changed the polish (we use universal photonics polish)
We changed the first and second fine pads to all new ones from a new batch
Since the problem only happens with poly (every thing is perfect with Cr-39) this seems to eliminate any issues with the generator or finners and polishers. we even upped the finning time by 30 seconds to no avail.
does anyone have any thoughts?
Thanks!
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