ShopReady Draft 2D · 39 s · narrated, with captions
A limit switch and a rule that turns the motor back
A carriage on a slide runs on a motor between two limit switches. Controls, at the foot of the Motion window, lists the switches with a lamp each and the rules they set off: when a switch goes on, stop, wait, and start the other way. On Play the carriage trips each switch at its place, the lamp lights, and the rule sends it back.
This is one part of a longer film
More in Motion and control
Clip · 37 sA stepper sent by a rule, and a beam that counts
A feed bar carries four pegs through a light beam. The beam is a gate; each time a peg breaks it, a rule sends a stepper 25 steps of 1.8 degrees and the dial's pointer moves on an eighth of a turn. A counter counts the crossings, and at four its rule stops the feed and sounds an alarm.
Clip · 52 sGears held at the meshing distance
With one gear drawn, the Gear tool holds the next on a dashed ring round it: anywhere on the ring is the meshing distance. One click places it with its teeth turned into the other's gaps, and a third gear goes on the second one's ring the same way. Then the third gear is clicked and dragged by its outline: it moves whole, held on the ring round its neighbour, and comes down in mesh again.
Clip · 48 sThe control panel: buttons, a toggle, lamps and an alarm
A barrier arm on a servo is run from the control panel, a small window of its own that stays up with the Motion window closed. Open and Close are buttons whose rules send the servo to a place, two lamps follow the limit switches, Lock is a toggle, and pressing Open while it is locked sounds an alarm in red.