Dual Projector Rig for Polarized Projection
Since 2012 I have been using a pair of DLP projectors (Optoma EP910) for polarized projection. To make the unit easily and safely transportable and to simplify all necessary adjustments, I designed and built this compact rig.
Front view
The beamers are enclosed in a solid box-shaped case which provides mechanical protection, but it has cut-outs allowing access to all controls and ensuring unobstructed ventilation. These projectors are quite bulky, so I designed the envelope as tight as possible.
Most of the box is made of solid 15mm plywood, joint using M6 screws and metal furniture nuts.
Both projectors are attached to boards that enable precision adjustment using thumb screws. The board carrying the upper projector has three-point alignment of the height, and the bottom projector can be rotated sideways around a pivot point. Aligning the projected images with these controls is fast and very accurate.
Back view
The rig can be laid on the base for bottom projection, but also inverted and laid upside-down for projecting from a high platform. All 8 corners of both bases are equipped with M8 threads for adjustable feet.
I can provide detailed CAD drawings of the unit in case of interest.
A detail of the vertical alignment of the upper projector. There are two controls at the back for tilting the projector sideways and one at the front to raise or lower the projected beam. The thumb nuts are custom made of aluminium (26mm outer diameter, M8 thread).
A detail of the pivot point of the bottom projector (M6 screw with a spring washer).
Adjustment of the rotation of the bottom projector (the same M8 thumb nuts as used for the vertical control).
A demonstration of the robustness of the set-up :-) A nice orthoscopic viewing postion! ;-)
The unit was too big to fit in any available back-pack, so I had to sew my own. Ready to go hiking!:-) Seriously, I believe this is the easiest and safest way of transporting those pricey and delicate devices.