Hardware for Mounting of Diamond Radiators

Mounting Bracket

Exploded view of the mounting bracket with the diamond shown suspended on stretched wires.

• Aluminum Mounting Bracket: TCW
  • Front Half: PDF TCW
  • Back Half PDF TCW

The intended wire for clamping in this bracket is the 20 μm diameter tungsten wire borrowed from CMU. The bracket should have the planarity to handle this. Assuming elastic deformation of the bracket around the wires, force of order 100 N is expected, yielding to a force of friction well above the above the elastic limit of the wire (i.e. the wire will break before clamp releases it.)

Choice of Adhesives

Ellsworth Adhesives (Dist. Germantown, WI), Resinlab Cynergy Line:

• 6103 Metal Bonding Cyanoacrylate Adhesive [1]
• 6402 Toughened Cyanoacrylate Adhesive [2]
  • Cynergy Surface Activator A [3]
  • Cynergy Solvent D Debonder [4]
• Also available:
  • AR 4305HP [5] (more general purpose, toluene-sensitive)
  • 736 high temp. silicone sealant: 500F continuous use, degradation at 600F

Frank Murken Products (Dist. Schenectady, NY) (awaiting call)

Hernon Manufacturing, Inc. (Mfg. Sanford, FL) (in contact with Nicholas LaBarre)

• Supertacker 351 (easily dissolved with toluene etc.) [6]
• Silastomer 333

K.R. Anderson, Inc. (Dist.), Morgan Hill, CA

• Representative: nothing available

Master Bond, Inc. (Mfg.) (awaiting call)

Diamond Mounting Trials

Simple setup for testing wire stretching. Cap head bolts take the place of precise diameter rods that specify wire spacing. The ~5 g weight is shown on the right.

Simple wire stretching exercises were performed. The wire is approximated to have to be well past its elastic limit bearing 50 g weight. A thumb screw threading two washers going into a threaded stand-off (long nut) provided a nice 4.8 g weight that can clamp wire. So, a wire loop is created by clamping the ends of a wire segment between the washers by tightening the thumb screw.

Photo of a groove embossed by the clamped tungsten wire. (Numbers indicate mm markings)

The tungsten wire was stretched using this weight and the shanks of cap head screws to keep the segments parallel. Playing with the first setup showed that the wire breaks quite easily and indeed, breaks before there is enough force to release it from the clamp of the bracket. The experience also showed that the wire is easily denatured (observed through kinks present even when stretched) so care must be taken in taking it off the spool and navigating around the supports.

A square glass sample 12 mm on the side glued to the 20 μmm wires for practice.

Photo of the diamond with a mm scale. It appears to be fairly precisely 4 mm

Trial of stretching wires spaced by the shank of a 6-32 screw. The resulting spacing of 3.5 mm is just a little too narrow for our 4 mm diamond.

The photo shows the diamond glued to 20 μm wires spaced by the minor diameter of 10-32 screws.

A strange artifact, potentially challenging the notion that this is a mono-crystal. A slightly different lighting angle shows very flat surfaces (so these are not likely surface features.)