Leonard Chau

B.S. Mechanical Engineering (SFSU ‘26). Maker and researcher building things at the intersection of hardware, optics, and software.

Reference charts and calculators I built for shop and CAD work.

  • Machinist Conversion Chart — interactive table converting between fractions, decimal inches, millimeters, letter/number drill sizes, and sheet/wire gauge.
  • Thread Size Chart — interactive table of American (Unified) and Metric thread sizes with tap and clearance drill sizes.
  • Wavelength / Color Chart — visible-light wavelength to color slider, built from real CIE 1931 color-matching data rather than an approximated rainbow gradient.