Are people using glue on LCD/Fresnels when they put them in the frame? I have a router and plan to attempt the Haas, but i have seen so many frames since the original design, I don't know what works well.


There are the sandwich style frames,

the dowel on top and bottom for support and a block on the sides with grooves to fit the panels

the square dowels nailed on the sides that form a groove

I am not sure of the advantages of theste various approaches and would like to know if there are any approaches that do not need glue.

The fresnels will expand and contract with use of your projector. They should only be "fixed in place" at like one "point" (not a whole side).

The LCD - similarly - should not really be "hard mounted" but rather allowed to "give" a little within its mount(s).

If you could "thermally" match a frame with your fresnels then they could be "hard mounted" but otherwise you run the risk of having them bow with use.

There are so many blasted variations on mounts it's hard to go into detail.

Silicone sealant has the advantage of being adhesive and still elastic. You need to think it through and your solution will depend on whether you're building a vertical or horizontal design as well.

Hope that helps a little bit.

Thanks,

I have the silocone sealant so that info is very useful to me. I was unaware of all the bowing issues, so that will help in my decision. I see a couple of designs that I like so I will keep that in mind. I also did not know that fixing it in one point is key.

It's been pointed out to me that absolute perfect alignment of the fresnels may not be so critical as one may be led to believe after reading the forums. That said, you should still strive for the best alignment you can achieve.

Fresnel bowing CAN be troublesome so allow for some movement - I think 1/8 inch is the accepted amount.

Be sparing with any adhesive you use just in case you need to remove and reposition in the future. In other words, don't lock yourself out or paint yourself into a corner.