davejlec

If your prototype is for a 12" mirror, you may want to check out a double plate mirror cell design made from a high-grade plywood. A 6-point PLOP designed cell would be more than adequate to provide support, (esp. if the mirror isn't full thickness) Basically described, a top plate with 6 contact "points" pivots on a (20 mm or 3/4") steel ball bearing that is sandwiched between the top and bottom plates, recessed washers hold the bearing in position . The "points" can be short pieces of dowel that are screwed and glued to the top plate. The mirror is attached to the dowels with silicone- it's important to use removable spacers between the mirror and top plate until the silicone fully cures - this prevents any torsional stresses to the mirror and applies them only to the plate. The design also includes 2 edge support points for the mirror. 12.5 6point cell (1).pdf