Bolt Circle Calculator
Hole X / Y for N holes on a PCD, the pitch between them and a drawing — then a printable flange with exactly those holes.
Hands off to: Flange Generator
Engineering calculators
Each calculator does the arithmetic and then makes the part: the result opens a parametric generator with the numbers already filled in, so the next step is an STL to print or a STEP for CAD, not a table to retype.
Clearance Hole & Heat-Set Insert Chart
ISO 273 fine / medium / coarse for M1.6–M24, the printed-hole allowance, and insert holes by vendor — then the boss or bracket.
Hands off to: Flange Generator, Shaft Coupling Generator, Pillow Block Bearing Holder Generator, Heat-set insert boss
GT2 Belt Length Calculator
Exact GT2 belt length from two tooth counts and a centre distance, or the centre distance for a belt — then the pulleys.
Hands off to: GT2 Pulley Generator