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Thanks for the reply, most of our manufactures data is accurate, but one of our suppliers data is out. I have reported this to them but I do not think they understand the technical part of their...

Anybody have idea how to sag a varifocal We sag at the very top of the blank. Anything easier??

Has anybody ever produced as aspheric sag gauge? We have one for spherical but obviously cannot be use for aspheric. The info supplied by the manufactures is not always correct even though the...

Hi thanks Wfruit have tried there before but no luck what i was hoping for is something like Essilors pre cal
anyhow thanks for trying

Hi does anyone know of a pre-calc program/software that can be downloaded.
I am after one that gives the centre sub as well as the edge subs on the 180/90 meridians. Our own sufacing program just...

Thanks Clive how do you keep the seg line straight ?

Does anyone do franklin split bifocals? We have done them before but very time consuming.I have a few ideas of making it easier but neve put them into pratice any ideas folks?

Hi thanks for the reply but: "Digital slabs"?

Do you mean freeform? over here never heard of digital slabs only the conventional or Youngers slab on.

Any info greatly appreciated
Thanks...

Hi Jeff,
I know it was a long time since you sent this article about slab offs but how do you keep the line straight when sufacing an oblique axis?
We always have to use the Youngers lens which can...

On hi plus spheres we used to use "cap tools" do you still use them?

Believe it or not we still have a hand smoother ( we used to call it a " poker arm", you may have known it as a pan handle)on which we used to hand roll the base/cross cyls that were out of range for...

Plus tooling? What a pain up the a**e! we used to do plus tooling until about 15yrs ago. The worst blanks were the 38 seg whick often used chunk off the edge of the oblong edge on the final cut.In my...

Thanks that as I thought

Rob

Thanks for the reply Harry sorry I didn't reply before but I was sailing the high seas!
I understand the reply like Dave suggested but if one prism was base in the other base out would one...

Hi, does anyone know of a formula to calculate oblique cross prisms as you you would calculate oblique cross cyls which normally occur with a over refraction?