A screw-clamp
A screw-clamp. On turning the handle the screw thrusts upward against the holder, which, operating as a lever, holds down the piece of wood or other material placed under it on the other side of its fulcrum.
Only the input is driven; every other part of this model moves by physics (MuJoCo), and its ratios are measured. Run it live, change its parameters, or switch the friction off to see the output stop.
- Modelled as
- A right-hand screw (pitch 1.6 cm, real thread lofts) turns in the nut of the frame (driven 16 rpm by its handle) on a carriage free only to slide up its axis; its collar presses up the tail of the holder, a lever on a fulcrum post, whose jaw comes down on the piece of wood by real contact and stops there, the screw stalling. A weak spring on the fulcrum keeps the tail on the collar. gen190.py.
- Measured
- The screw rises 0.00250 m/rad (thread 0.002546), r2 1.000; the holder tilts 14.86 rad per m of rise, r2 0.998; the jaw meets the wood at 0.26 rad near 5.5 s and holds (screw 0.001 rad/s); penetration 0.07 mm.
- Notes
- The clamping force is set by the driver torque limit (1 N m); the fulcrum spring is a modelling aid.
Film (MP4) · GIF · Still (PNG) · Spec (YAML) · Model (MJCF)
