Instructions for Making Cricket Legs

Cricket's legs are made from 1/4" aluminum tubing which can be purchased from a plumbing store. The walls should be 1/32" thick. Anything with thinner walls will probably collapse when you bend it.The tubing is bent using either a tubing bender or a wooden fixture as shown. The fixture has a 1/4" hole with a curved relief leading into the hole. The tubing is inserted into the hole and then bent flush with the curved surface. After bending the tubing, there is a small amount of deformation but it does not look bad. Once you get the legs bent, cut them to the correct lengths as shown on the drawings and glue (epoxy) the hinged standoffs onto each leg. Each joint will need a 6/32" screw inserted in a threaded end of the joint and then cut the head off. The resulting threaded shaft is what the glue adheres to when you glue the hinge to the end of the aluminum leg. Notice on four of the legs, the standoff faces one direction and the other two center legs, the standoff faces the other direction. This is because the outer legs swing forward and backward and the center legs swing up and down. This is shown on the drawings.

   
 Wooden Tubing bender with 1/4" hole
and curved surface for leg bend.
Tubing in the fixture is ready to be bent
 Bend the tubing gently against the fixture.

   
 Hinged standoffs, one shown with cut off screw. Make sure the screws are tight before gluing them to the legs.  Leg parts before assembly, joint with cut off 6/32 screw, aluminum leg, rubber grommet and pin, and the servo horns for center legs (not needed on outside four legs). One joint is shown without the cut off screw. The holes have not been drilled yet.

   
 Drilling the 1/16" holes for the control wires. Drill the small holes in the ends of the legs to receive the tiny wire that holds the grommet on the end of the leg and the holes which receives the control wires (0.0625").This can be done with a hand drill also.  I use a small block of wood with 1/4" holes drilled in the side to hold the legs upright while the glue on the hinges dries. Note: it is important for the hinges to be aligned accurately to the leg so that the leg swings evenly with the ground.

   
 A bare leg, one with the joint and grommet, and one completely assembled  Complete outer leg ( 1 of 4)

   
 Complete Center Leg (1 of 2) shown with servo horn. The horns need to be installed so that they are facing forward on right and left legs, mirror images of each other.  Complete Center Leg (1 of 2) shown with servo horn and easy connect (brass device). Center legs must be mirror images of each other.