Joint 01
Plain pin
How freely should a panel rotate around a simple pivot?
Establish a low-part-count reference joint for later tests.
A pin does not intentionally hold a chosen angle; fit and play still need physical measurement.
Step 01 · Joint
Three ways to make a panel move.
These concepts frame a future controlled comparison. The illustrations teach the movement idea; they do not show tested parts or a selected design.
Illustrative conceptsNo measurements published
The comparison questions
Joint 02
Adjustable friction
Can adjustable contact resist motion while remaining usable?
Compare holding and breakaway effort at a chosen preload.
The schematic does not calculate torque, wear, or the effect of tightening a fastener.
Joint 03
Indexed detent
Can a joint return to a small set of repeatable positions?
Study discrete stops separately from continuous friction.
Illustrated angle snapping does not represent a ball, spring, force, or manufactured stop.