Just wanted to know how many of you guys use loctite screws or liquid when customer is constantly complaining about their screws falling out.
Is the liquid better than the screws????? Do you have to heat the area to remove the screw if need be down the road???
Just wanted to know general experiences.
Hilco self threading screws/tap and snap- assorted sizes. Great product ending the headache involved for both parties.
"Always laugh when you can. It is a cheap medicine"
Lord Byron
Take a photo tour of Cape Cod and the Islands!
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Nevertouch the stuff personally. I use a tap tool to cut new threads and replace old screw with a 1.4. It's a more permanent fix and no risk of getting loctite or, worse, SUPERGLUE on a lens.
Safe-Loc screws only for me. I use the 1.4 X 3.5 silver for most eyewires.
http://www.hilco.com/catalog/catalog...IDType=catalog
Life is too short to deal with the liquid. The screws don't bother polycarbonate lenses like some Loctite liquid can! The screws don't need any heating to remove either!
PS. How long until some Old Timer chimes in and says;
"Back in my day, real Opticians peened screws!"
Originally Posted by Fezz
YES we did
I do both methods, tapping and using a self tapping screw, depends on what seems to be the best.
I use threadlocker on all chassis screws before the eyeglasses are dispensed. Loctite 4851 for poly,
http://opticalresourcedotcom.files.w...ctite-4851.pdf
and blue (medium strength) for everything else.
I believe so. I use the Safe-Lok screws for the temples.Is the liquid better than the screws?????
No.Do you have to heat the area to remove the screw if need be down the road???
Some frames have no screws at all. They are my favorites.
Science is a way of trying not to fool yourself. - Richard P. Feynman
Experience is the hardest teacher. She gives the test before the lesson.
Right on Fezz. I'll add that I keep the same 1.4x3.5's, but I also have the 3.0, 4.0 and 4.5. Covers me for almost every situation and they hold very well.
Nick
+1!
Me too!
Purple works well and is easier to remove than blue. I find there is no need for medium strength on an optical sized screw. 2 ml bullet size container with the long thin nose (nozzle) works best for finer control and dispensing. Don't buy the 6 ml size containers as you will waste more than you use.
I have found, after a long an exhaustive multi-decade search, that german made loctite 241, available from B&S/ McCray-canada as product #30400. In addition to Robert M's poly suggestion, I also use Loctite #450 (non-solvent based).
I rarely peen screws. Most frames are too ****ty for this procedure today.
B
**ALL** US Military contracts that cover finished eyewear require peened screws. When we did laser eyewear for the Navy in 1992, we used a pressure sensitive center punch. The only way to take the screw out after that was to lightly touch a drill to the peen and remove the end of the screw.
I use clear finger nail polish. does the trick.
Several ingredients in clear nail polish are not compatible with polycarbonate- Ethyl Acetate, Butyl acetate, Toluene, and maybe others.
Science is a way of trying not to fool yourself. - Richard P. Feynman
Experience is the hardest teacher. She gives the test before the lesson.
I tolerated the Massachusetts accent barely long enough to order them, thanks for the tip.
Thats good to know. But I am not putting it on a lens. But on the head of a screw. :-)
But I do use the lock tight screws that are pointed at the end from Dynamic Laboratories.
Try the Vigor self-tapping screws. If you don't have an account with Vigor, John Sessoms sells them on his opticianworks.com site. They're pricey but quicker than tapping them in yourself.
Thanks for the tips but I still find the liquid convenient and easier to use, I protect the lenses before even applying the liquid, never had a incident so far.
You must take into account that Loctite has dozens of products for different applications, nuts, bolts, screws, pressure applications, etc. Plastic lenses have at least a half dozen different materials and one loctite may work on some but not all lens materials without damage.
Chip
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