![]() ![]() Lastly, I applied high gloss polyurethane to the entire cradle and installed felt pads to the circular triangles using gorilla glue. What I ended up doing was installing knobs on the remaining four guide bolts which allowed me to raise the pressure plates evenly and allowed enough room to fit the optical tube though the cradle. Note: I did not leave myself enough height to for the optical tube to go through the cradle without playing with the pressure beam guide bolts. Install knobs for ¼"-20 shafts onto ¼"-20 Pan Head Bolts (2" long) that will be used for lowering the pressure plate. For this work I was fortunate enough to have a router to use.Īttach mending plates to the center of the pressure plate for the pressure bolt to ride on. I had to remove wood from the circular triangles in order for a proper fit. I used wood glue, 1 5/8" deck screws, and 3/16" wooden dowels.Įnsure the optical tube will fit through the box and the Pressure plates fit into the box and that the circular cut triangles match up with the optical tube (dry run). While the box is drying, assemble pressure beams. Check the squareness and clamp the whole unit for 24 hrs as recommended Stellafane Cradle. For added support, I added three 3/16" wooden dowels (and glued them in) to each joined piece. Using a clamp, press six ¼-20 Tee Nuts into each hole.Ģ) Assemble Wooden Parts (Box and Pressure Plates).Īssemble box with wood glue and #17 1¼" or 1½" wire brads (four per side). Four holes near the ends are 1½ inches in the two center holes in the top are centered. Prior assembly: 1) To the top piece drill six 5/16" holes approximately 3/4" from the edge centered over the pressure beam as recommended by Stellafane. ![]() Note: I made the round cuts on the Triangles for a better fit using a jig saw and fitting them to the outer diameter of the optical tube.ġ) Cut the Box Assembly to the dimensions above. Triangles 4 ½" per side, will have a notch cut into them for the pressure beam. The Pressure Beams and Triangles: ¾ inch N-N birch plywood. Large metal handle (for carrying cradle and tube.) Mending Plates (Carriage Bolt head presses on these) Knobs for ¼-20 shafts (I was unable to find these at a hardware store or Home Depot as Stellafane suggested, however, Amazon had them) ![]() ¼-20 2 inch long Carriage Bolts - fully threaded (pressure bolts for pressure beams) ¼-20 3 inch long Pan Head Bolt - fully threaded (retaining bolts for pressure beams) I used the following hardware for the cradle assembly, and purchased stainless steel parts when possible to avoid rust: Top & Bottom Width = Tube OD + (2 × ¼" side gap) Side Height = Tube OD + ¼" bottom gap + ¾" top gap + (2 × Plywood Thickness) The box part widths can be calculated as follows: ![]()
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