Just upgraded to a new edger and on my first Trivex job the same thing happened as with my older Edger:
What would cause Trivex Materials to shatter while edging?
I was using the soft mode and A/R anti-slip material. It's odd that's it's happened on 2 different edgers.
Would Photochromic or AR have any impact on lens durability?
Are you using a Trivex setting? If not, I would dry rough and wet bevel like Poly. I have the occasional slippage issue with super hydro, but have never had one shatter
AR does degrade its impact resistance, but they will pass standard drop ball tests. Using AR and soft mode will reduce chuck pressure and rotation speed, so unless your chuck pressure is way off, this shouldn’t create the shattering.
Which edger did you get?
Nope used Trivex setting and soft Mode, It happened on my old 9000SX (which is why we stopped edging Trivex in house) and just upgraded to an LE1000.
Hmmm. Unusual for a Santinelli. When you say shattered, is it outside in or block out? Santinelli users, any insights? I’m thinking chuck pressure.
I use the Weco E6, several Optronics, a Huvitz and MEI without this issue.
David, do you have a trivex wheel? At least half my edging is trivex. Never experienced any issues edging the material.
I know my old one did (we upgraded the wheel to a Trivex diamond wheel). I'll double check on the new model.
Yes it's shattering with the block still on, the right lens was just a small chunk on the nasal edge while the left lens completely was reduced to almost nothing but what was held in place by the blocking pad and AR tape.
The only thing I can think of is an imbalance in the wheels (like a car’s tire). Other than that, the edger’s setting.
When the edger was installed, did all lens material settings get adjusted. This may be a case of differential mismatch between the roughing and finishing wheels. How does the lens look off of the roughing? Is it intact?
I've cut over 10,000 pairs of Trivex and have never seen or heard anything of this nature. Are you sure you're getting actual Trivex from your supplier and not something of a hybrid material? There is a Hi-Vex monomer on the market that is not pure PPG Trivex.
If you can, post a pic of the lens package and the lens after it is edged.
+1, and I've only ever edged anything trivex on a 9000sx with a standard roughing wheel or my new Lex-1200 with whatever the Nidek roughing wheel is.Originally Posted by Lab Insight
I've never ever had this happen. Post pictures!
I would agree with this, seems like a material issue. Most of the jobs I cut on my ME-1000 are trivex with AR and grip coating. I have never experienced anything like this either. I have a trivex wheel, chuck pressure set to 5(highest) and don't process on soft mode. I will use soft mode for super hydro stock lenses that come without grip coating. They tend to slip.
I ordered a few test jobs from a lab last year at the behest of an industry friend. I ordered Trivex they sent me something that was not Trivex. I called to clarify what they sent and I was told it was, a good mid index equivalent to trivex but much cheaper, or some nonsense like that. Needless to say I didn't order anymore jobs from them.
I've never seen a Trivex lens break during processing. The only time I've seen a broken Trivex lens was when a woman ran over her +0.50 sph. Trivex lens with both the front and rear wheels of her car.
Trivex is a laminated material which does not shatter. You may have the wrong roughing wheel which is causing excessive heat and hence delamination Pictures of the defective lens would us help you
It's not trivex... But then again why is any lens shattering on the wheel
The only Trivex that are laminated (tmk) are polars or Transitions poly fts. Trivex is a cast monomer like CR. Below is a website on it's construction (in a short video)
I've sent the lenses back as defective so I don't have photos of the lenses or packaging. I'll get some when they replace the lenses.
They were uncuts so maybe they swapped materials without telling me?
When everyone knows the formula "for success", you pay for quality control.
Correct but part of the question asked if Photochromatics or AR coated lenses would affect durability. So my answer was in direct response. Great info though as related to Trivex in general.
That sounds probable. The lab should always tell you when you get subbed!. If they gave you a 1.56, that material is very brittle and may shatter which would make sense.
Ok, got ya. I see I forgot to provide the link in my previous post, for those that want to see it....
http://www.trivexspecialist.com/blog/how-a-lens-is-made
Okay so after I sent the pics into Santinelli I was told this is caused by slippage rather than the lens Shattering.
I completed 1 TRIVEX AR job without issue but then the TRIVEX PhotoCHROMIC AR lenses came out as follows.
Also completed POLY AR and CR39 PhotoChromic jobs without issues.
Poly Trivex Testing
https://youtu.be/WO-hoibxBOY
This is definitely 100% slippage and not shattering. Perhaps you meant chattering? That is when the lenses are so thick, the edger can barely keep up on the rotation and cut causing tiny chatter marks and slippage at the same time.Okay so after I sent the pics into Santinelli I was told this is caused by slippage rather than the lens Shattering.
I completed 1 TRIVEX AR job without issue but then the TRIVEX PhotoCHROMIC AR lenses came out as follows.
Also completed POLY AR and CR39 PhotoChromic jobs without issues.
I'm not seeing any anti slip (hydrophobic) discs with your blocking which is an absolute must when edging AR coated lenses. Even if your current pads are rated for AR, they do not provide sufficient adhesion. Perhaps the reason the clear pair was edged successfully may be due to the AR quality. The Photochromic may have a premium AR. There are several recommendations/posts on this forum for the best anti slip pad.
Or maybe this:
https://youtu.be/38xXLsnrXM8
There are currently 1 users browsing this thread. (0 members and 1 guests)
Posting Permissions
Reply With Quote
Bookmarks