geop-lib-stdlib

This page is a reference to the crate; how a program places such parts is in Lecture 38.

The standard parts — ISO screws, nuts, washers, dowel pins, standoffs, ball bearings, T-slot extrusions, a NEMA 17 motor, involute spur gears and their rack, GT2 pulleys, shaft collars, flange couplings, MGN linear guides, hobby servos — one program per family, generated in Rust and written in the arguments of the operations that build them (sketch, datums, extrude and revolve, patterns, parameters). A family’s sizes are the rows of its table parameter size, its dimensions read from that row by the formulas of its sketches (Drawing), so a program placing one picks its size like any parameter of a placed part.

Every part turns around, or runs along, the z axis, and carries named datums to mate it by: axis, and a plane for the face it sits on (StandardPart::base). The faces a thread goes on are named in StandardPart::threaded.

WithStandardParts is a FileStore that adds the standard parts beside a workspace’s own files, as read-only files named std:… (std:iso4032_hex_nut.geop), which mean the same file from anywhere; geop-cad-base wraps the editor’s workspace in it. parts() and part(file) give the families themselves. Listing them builds nothing: a family’s program is generated the first time its file is read.