Ben and Jerry at the Gym

myminifactory

Ben and Jerry are two brand new characters added to this third automaton, young competitive brothers who face off at the Gymnasium. A simple setup of cams powers the right arm into a punch, with a wire attached to the forearm to move it straight to the Punchball. Each brother takes turns hitting the Punchball, with timing controlled by a swivel plate mounted in the center of the camshaft. Construction is straightforward, guided by the drawings shown here. The motion is geared down three to one to slow the motions as they seemed all a little too quick when driven directly. For more models to print, including several working clocks, visit https://www.3dprinterclocks.com/page26.html. You will need one of each STL part except for the following: Arm upper LH 2, Arm upper RH 2, Arm Lower LH 2, Arm Lower RH 2, Trousers 2, Heads 2, Hair 2, Hats 2, Legs 4, Hand Boxing LH 2, Hand Boxing RH 2, Arm Pivot 2, Arm Cam 2, Arm Follower 2, Shoe 2, Shoe Pivoting 2, Body top 2, Punchball Cam half 2. You will also need some extra components to complete the build: A PDF file showing the dimensions of these parts can be downloaded here. You will need 1 piece Ø 3 mm steel rod 160 mm long, 1 piece Ø 3 mm steel rod 27 mm long, 4 pieces Ø 2 mm steel rod 8 mm long, 1 piece Ø 2 mm steel rod 10 mm long, 4 pieces Ø 2 mm steel rod 20 mm long. Additionally, you will need Ø 1 mm soft wire (paper clip) for the Lifting Pin in the Shoulder and the Actuating wire for the arms, Acetone to solvent bond some of the parts together, Drills Ø 2 mm and Ø 3 mm for the holes that need to be a tight fit, and Drills Ø 2.2 mm and Ø 3.2 mm for the holes that need to be a loose fit.