Puncher battles are a fun classroom activity that guarantee that students will innovate to win! By tuning the bar lengths of their puncher's 4-bar linkage, students can take advantage of "inverse leverage" to throw fast punches to knock their opponent's block off.
Step 1: Before Finishing Your Build, Tune Bar Lengths to Optimize for Punching
The above bar ratio of 2:4 means the fist's speed and distance traveled increases significantly
Step 2: We'll Build a Puncher in Stages, Starting With Bar 2
Step 3: Here Are the LEGO Technic Parts Used
Step 4: Assemble Bar 2
Step 5: Assemble Bar 1 (the Handle), and Add Bar 3
Be sure to use theyellow frictionless pins for joints designed to move!
Step 7: Add a "Block" for Your Opponent to Knock Off
Step 8: Optional: Motorized Punchers
Punchers can also be motorized to make "battle bots". This can be done by programming a servo motor to do a partial rotation, or by adding a crank and a 6th bar as is done in the video above.
Runner Up in the
Simple Machines Challenge