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Correct me if I'm wrong, but isn't CR-39 the majority of lenses in Europe and Asia? And the US is the odd man out, focusing on poly? Kind of like the old standard vs metric thing huh?

Over half a year, I always told myself if I made an account I wouldn't abandon threads, not enough discipline apparently. Sorry guys :frown:.
A long overdue update, the scratches and fining marks...

Sorry about not updating yesterday, got called away from the lab. Today I only got to play with 1 job and the option available/chosen was lighter pressure and it doesn't look like I'll have much time...

Thanks a lot for your input, I'll be testing out some of the recommendations made in this thread and it definitely helps to have someone else's results to compare against. Unfortunately I won't be...

Yeah I understand too, I can totally understand a couple of "DOH!" moments but when you're getting several a day, something's wrong and you start feeling not too bright. Also it's more like...

Oh wow, I just realized, a projected eye chart screen. Duh. Well guys, good example of my uhhh...airheadedness? I'm not sure of the word I'm looking for but you can go ahead and fill in the blank for...

Ah, so a shadow box/shadow scope is the same thing as an arc lamp? We have a Bulbtronic, basically an arc lamp which shines onto a flat platform so you can hold a lens parallel to the platform and...

Not at all, thanks for taking the time to provide your expertise on my issue.



My 1st issue (hairline circular scratches) I'm puzzling over as I haven't seen such a pattern before, they are not...

No we're not putting a safety bevel on the lenses, I was under the impression the bevel and/or cribbing was mainly to improve fining/polishing quality by allowing more water/polish to flow under the...

Ha! Combined two responses into one! Getting smarter! :smug:



The vast majority of the time, I would say about 95% of the time, all generator marks are gone (not visibly detectable with the...

After reading this comment, there is now a little bit of doubt in the back of my mind, but I am still about 95% confident that handling/cleaning is not the cause of these hairline scratches. I shall...

I'm not currently at work at the moment so I cannot say exactly what they are, but I think they are 3.5" as they are larger than my 3" pads. So no, my fining petals do not fully cover the lap. I...

This is exactly why I haven't extended the fining time, I feel much more comfortable lengthening the polish time. I will go back and increase the fining time on the 2nd step by 30 seconds and see if...

Wow, a lot of responses! Thanks for the warm welcome and the help! Sorry about the late replies, I just got home now and am responding as fast as I can.

WFruit:

Since these are poly lenses, do...

I'm not rubbing the poly lenses after polishing and rinsing it, I can't say what our techs are doing but they shouldn't be. All the lenses I'm taking into consideration at the moment are ones I've...

Yes my generator does support cribbing, and you are correct the lenses are not cribbed. We only have the PCD cutter (Optek 8300-348) that came with the generator so we do not have a fluted cutter. We...

Yes, this does occur with spherical jobs and clean water. We've also tried to check to see if our generator was off by coloring in a lens with sharpie and fining for 10 seconds, there were a couple...

I believe you are addressing the 2nd issue I am having? The one about fining marks on the perimeter of the lens? This is an ongoing issue, we've changed the water and we still have the issue. The...

I am using recycled water, filtered through a coarse mesh and a pantyhose.

The pressure I gave (19.8psi) is the head pressure, the machine pressure is 50psi.

The generator, in my opinion, gives...

Hi! New participant in the OptiBoard community, I would like to give my greetings and also present to you problems I am having with setting up our surfacing lab. Below I've listed the equipment and...