Pits/Specks

[mxmj]

Need advice please I am having problems with a pair of 1.67 progressive lenses. Ran one pair yesterday and the OD had 5 or 6 deep pits with no tails and the OS was fine. I got a new OD in today and ran it with the same pit results. I also looked at the OS that was fine yesterday and it now has pits as well! I had just changed my blade on the generator, checked polish temp and made sure not to expose the lenses to any unnecessary heat sources. Any suggestions would be greatly appreciated!!!!

[Kujiradesu]

How old is your polish? That might be a factor. Only thing I can think of.

[mxmj]

Polish is about 2 weeks old. I don't run a ton of lenses so I usually can get by changing it about once a month.

[Kujiradesu]

Polish is about 2 weeks old. I don't run a ton of lenses so I usually can get by changing it about once a month.

"get by" is a give away for me. If you have a significant amount of swarf in the polish and evaporation over two weeks time, both of those things could give you pits. I could be wrong. I would change out new polish before running new lenses.

[mxmj]

Thanks! I'll give it a shot.

[Quince]

Any power fluctuations from the generator? Are you hard coating after?

[lensmanmd]

Which generator are you using?

[mxmj]

SGX generator

[lensmanmd]

I would check the vortex chiller adjustments. Position, temp and flow. When is the last time you checked the drive belt tension and condition? I would venture a guess that along with the pits in 1.67, you may also be experiencing intermittent deblocking issues with poly.

[mxmj]

Thanks. I will definitely look into it.