I need some advice, I recently opened a retail location with a small mini lab. We are using a 6E to edge our lens. I have been noticing that some of the poly stock lens we use have been cracking in the middle (where the block is). Usually about 3-6 small, vertical cracks about 2mm in length, grouped in a 2-3mm diameter.
Some information that might be relevant is that the 6e we were using had an AIT chuck, and we switched over to weco vario. We also are trying out a local stock lens distributor. We haven't had this problem before with the 6e, but we were using the AIT blocks back then. Lens power of fractured lens has ranged for 1.5 to -5.00 so far.
I am trying to figure out if it is the edger or the quality of the lens.. I was wondering if anyone has insight or experience on this. If it is the lens I need to return my stock ASAP!