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National Optronics :: Finishing Equipment :: 7E Patternless Edger :: slipping lenses on 7E HLP  ::
feisal
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National Optronics
Posts: 1
slipping lenses on 7E HLP (May , 2009, ) quote  
Hi,

I have a problem with slipping lenses, specifically thick poly or trivex. This happens during the roughing cycle.

The first time this happened I was told by tech support.
1. use bigger blocks, I use the 18mm Essilor block so we ground the sides of the 26mm block to make it rectangular in shape. I also use 3M LeapIII pads
2. the chuck pressure was changed to 12 (R) and 10 (F) and the smart spiral option was checked. I am using the coated blade.
3. Use the thick poly lens option when cutting thick poly/trvx

It then happenned again, actually several more times. This time tech support changed
1. roughing offset from 8 -> 10 and recommended that the coated blade (900 cuts) be changed.

My question is: Does anyone have similar problems?
This is a 1 month old machine replacing a Kappa and I never had problems of slipping with the Kappa.
Are there any more things I should try?

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OptiTech
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Posts: 9
RE: slipping lenses on 7E HLP (May , 2009, ) quote  
The biggest cause of your problem is most likely the "coated" blade. You'd be better off to use the carbide blades and change them more often, after about 250 to 300 lenses.

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Acalanthis
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National Optronics
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RE: slipping lenses on 7E HLP (June , 2009, ) quote  
We stopped running the really thick polys and thick trivex on our 7E's quite some time ago. We found that while you could some to work, its better to run the those types of materials on a Kappa or AIT if you have one. Save the lighter work for the 7E. If you have no other edgers, then try the Mega setting on the 7E if you have it. That might help a little.

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LabQueen
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National Optronics
Posts: 2
RE: slipping lenses on 7E HLP (August , 2009, ) quote  
If you send me your email I can send you the settings I changed... colleen.mccready@gmail.com. It helped alot, and I am now cutting -11.75's on the 7E with no twisting

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Honza
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National Optronics
Posts: 5
RE: slipping lenses on 7E HLP (September , 2009, ) quote  
I tried even less pressure on the lens and the knife blade frequently change. I use "carbide" knives and change after about 190 pieces

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cshay
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National Optronics
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RE: slipping lenses on 7E HLP (March , 2010, ) quote  
We found at our facility a 7E that had a cracked coupler on the axis motor. This was causing the thicker lenses to bind on whatever setting we were using.

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