Resources
Charts and guides for the things you look up mid-drawing: symbols, drill sizes, bend radii, and what each one costs you downstream. Free to read, free to keep, no trial and no expiry.
Keeping a copy takes a free account, which also brings you the monthly newsletter. You can leave it from any issue in one click.
GD&T Cheat Sheet
The symbols, datum rules, and feature control frame anatomy on one page. The reference to keep open while you dimension.
Tap and Drill Chart
Drill sizes for every common inch and metric thread, with thread engagement percentages so you can pick a size instead of guessing.
Weld Symbol Chart
Weld symbols and what each one actually asks the shop to do, including the ones people draw wrong most often.
CNC Design Guide
How to design parts a machinist can actually cut: tool access, internal radii, wall thickness, and the tolerances worth paying for.
Sheet Metal DFM Guide
Bend radii, relief cuts, hole-to-bend distances, and the flat-pattern math behind them. Written for parts that come back right the first time.
Injection Molding DFM Guide
Draft, wall thickness, ribs, bosses, and gate placement, plus what each one costs you in tooling if you get it wrong.
