Hi all
One issue I've been having recently is that when using LINE diffraction mirrors mounted on holders around venues there's no easy way to align the mirrors in terms of the rotation. The holder is fine for the "up/down, left/right" alignment but with a diffraction grating mirror you really need to be able to rotate the grid so that you get the correct visual effect.
Typically with a LINE grid I want to align the grid so that the lines are in the horizontal plane. This is because I use them around the venue to simulate additional projectors when doing a "laser grid" kind of effect above the crowd. It's important to get pretty decent alignment when doing this.
Does anyone know of a suitable tool or method for aligning the mirrors? Currently I use velco (!) and pretty much just get it roughly correct and then stick it on and try to make final adjustments by twisting the holder a bit. This is OK but a bit fiddly and slow. Plus I always worry that the force needed to pull the mirror from the holder will break it.
I was thinking of some kind of simple bearing thing. You glue the bearing to the holder and the mirror to the bearing then you can just rotate the mirror whenever you like.
I suppose I could get some circular metal discs made up and fit a countersunk bolt through the middle and into the existing holder with a spring washer and nylock nut but was wondering if anyone knew of something ready-made first before I start messing about with the DIY route?
Cheers,
John