Question

A CNC programmer must move his fingers between 20 keys on a center lathe control unit (from A to T). The key is squared with 15 mm side. The keys are arranged alphabetically it two cascaded rows (B next to A in the same row). A Fitt's Law relationship was measured as: Movement Time (msec) = -50 + 55(ID).
a) How long will it take this programmer to move his finger from A to J
b) By how much will a single movement time increase or decrease if the programmer moves to T instead of J?

Answer 1