Vertical lift: Prototypes #1, 2, 3

Objective / Constraints Automated vertical transportation. Vertical travel: 100 to 200cm. Load: 4 to 30kg. Some objects must remain at a constant orientation and cannot endure significant acceleration or jerk.  For instance, unenclosed liquids and most LCD displays cannot withstand impacts and must be oriented within a few degrees of vertical at all times. SPOILER: Of 8 prototypes, the first 7 failed in practical applications. Prototype #1: Electric scissor jacks 12VDC/6...