ShopReady Draft 2D · 1:15 · narrated, with captions

A carriage that shuttles between two limit switches, part 4 of 6: A counter, an alarm and the log

A counter switch goes on once the left limit switch has gone on three times; its name is typed in its row. A rule with two things to do stops the motor and sounds an alarm, whose words are typed in the rule. On Play each rule says how many times it has been set off; after three trips the motor stops, the alarm shows in red, and What happened lists every switch and rule with its time.

Before thisA carriage that shuttles between two limit switches, part 3 of 6: Two limit switches and two rules NextA carriage that shuttles between two limit switches, part 5 of 6: Start, Stop and the control panel

This is one part of a longer film

Whole project · 8:36

A carriage that shuttles between two limit switches: the whole project

A rack-and-pinion carriage and its control logic, built from a blank drawing in six steps. The drawing side is rectangles, the Gear tool, a rack added to the gear by a right-click, and an assembly. The Motion window gives it a slide and a motor; the Controls section adds two limit switches, a counter, two buttons and a gate, and five rules that read as plain sentences; the control panel runs it. It shows a machine's wiring tried out on the drawing before anything is built: what each switch is for, what each rule does, and the log of what happened.

The rest of this project

Chapter · 1:30

A carriage that shuttles between two limit switches, part 1 of 6: The carriage and its rack

Chapter · 1:15

A carriage that shuttles between two limit switches, part 2 of 6: A slide, a motor, and why it needs switches

Chapter · 1:31

A carriage that shuttles between two limit switches, part 3 of 6: Two limit switches and two rules

Chapter · 1:53

A carriage that shuttles between two limit switches, part 5 of 6: Start, Stop and the control panel