The springs are there only to give freedom to the length of the tendons when the wrist rotates. IMPORTANT: When setting tension for the tendons, the springs should stay at rest (not stretched out) other wise they won’t have the desired effect. I used SuperGlue to keep the piece of tube settled in the ring of the spring. Use a small piece of tube to drive the tendon, this will avoid the erosion of the braided fishing line. The purpose is to keep constant tension on the tendons using a extension spring 0.5mm diameter, 1cm length(13/64″x13/16″). This is a new addon(Tensioner.stl) I designed in january 2015. Glue or screw the simple servo bed with 2 wood screws. Set in Robpart5 the simple servo bed, make sure it is completely seated on the bottom. Trim/Fill the holes of the simple servo bed if there is overhang. Mine were not fitting, due to overhang, I heated them slightly with a lighter flame to make them fit. ![]() In Robpart5, insert two nuts for 3mm bolts in the printed cavities. Use the little rubber silentblocs that came with your servos(if you have the previous version). These are for to fix an extra servo to get a double actuated thumb. ![]() Redrill the holes on the side of Robpart2 with a 6mm drill(if you have a previous version with holes). Control that your parts are correctly aligned. Help yourself with pliers to hold the parts together while you glue them with Acetone or Zap-A-Gap (ABS) or Epoxy 2 components or Zap-A-Gap(PLA) Avoid using glue on the outside other wise it won’t look clean. Remove the antiwarp supports and trim with a knife, RobPart2, 3, 4 and 5 The left hand is similar but parts are mirrored. These instructions are for the right hand.
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