Hey
Since my Fresnels will need to be cut to go with the SGI monitor I'm using.

Initally I thought I would use my tablesaw but now Im reconsidering.

Maybe it would be safer and cleaner to set out a soft towel on a bench then use a straight edge and a plastic cutter to score it then break it.

I have an 80 tooth planer blade in my saw that will cut it no problem but I'm thinking the grooves of the lens will be delicate and could easily get scratched not to mention all the crap from the saw flying around.

Thought about taping paper down on the surface of the saw but even paper is abrasive and could scratch it.

Ive got a RotoZip and Dremel tool. Ive read about people using them for cutting as well.

WHat do you guys think ? At $50 a pair I dont want to buy any more than I have to..


Thanks Steve

i also use an 80 tooth laminate blade in my table saw works great for
cutting plastic. to protect the lens, just use painters masking tape 3"
wide. tape both sides of lens to protect it from scratches and debris.
the saw blade will cut right through it, and you can mark you cut lines
with a scripty on it. the score and flex/snap over a table edge or rod will
work, but i have managed to ruin a nice large fresnel that way. best of luck.

Score and break, makes a perfect edge.

I taped cardstock on the fresnels surfaces that were to be protected. the tape went all around the edges of the card to mark the cut lines so no particles could get underneath. Worked perfectly. Just make sure the lenses and the card ar particle free to begin with and you should be fine.

With regards to cutting, do the cuts have to be exactly measured, i.e. from the center, or, doens't it matter. Not sure I still understand HOW these lenses work. I know what they do, just not sure if the measurement is critical
Thanks

Needs to be centered. The fresnels have circle shaped ridges, so it's important that the center of the smallest circle is in the center of the lens..

As a general rule, measurement is ALWAYS critical.


Take it easy,
Phil.