Mirror-O-Matic Clamp for MoM 14 machines

I've designed a simple clamping system to attach to a standard Mirror-O-Matic 14 platter, allowing it to hold 14" blanks
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updated May 24, 2024

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I've designed a simple clamping system to attach to a standard Mirror-O-Matic 14 platter, allowing it to hold 14" blanks. 

This system allows for centering a blank up to 14 inches in diameter, and so far proves strong enough to resist the forces involved during rough grinding through polishing. This system can accommodate mirrors as thin as 17mm. With appropriate adjustments to the platter, they can accommodate arbitrarily thin mirrors.

Printed in PETG. Highly recommend PETG or better based on layer adhesion alone, but PLA could likely function. I elected to print solid, but 4 perimeters with 50% infill should prove effectively identical.

These clamps are built around #10-24 hardware. Slot is for a #10-24 nut. Fit is very snug, may take pliers to press-fit. Best done when print is still warm. This clamp requires drilling into the plywood platter base. Nuts must be countersunk and bolt ends need to be at most flush with the platter base. Bolt length depends on the thickness of your platter base, so plan accordingly. My base is ¾ inch plywood, and the spacing for the bolts is 0.787 inches or 20mm- so I used 1.5" #10-24 bolts. This means the bolts do not collide with the pulley belt that rotates the platter. 

Caps for the bolts are currently a work in progress, though the concept is quite simple. All that is required is something between the bolts and the blank.

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