PrefixSymbolFactorValueteraT10 to power of 121,000,000,000,000gigaG10 to power of 91,000,000,000megaM10 to power of 61,000,000kiloK10 to power of 31,000hectoH10 to power of 2100decaD10 to power of 1x--10 to power of 01decid10 to power of -10.1centic10 to power of -20.01millim10 to power of -30.001microµ or u10 to power of … [Read more...] about Metric Prefixes: Tera to Pico, Symbols and Factors
Drafting Standards
AIA & National CAD Standard Layer Format, Decoded
A-WALL-FULL-DIMS is not a code you have to memorise. It is four separate fields, each one a plain abbreviation, read left to right. Once you can see the fields, every layer name in a set of American drawings reads itself. This is the AIA CAD Layer Format, which the United States National CAD Standard adopted and still carries. The standard itself costs money and is … [Read more...] about AIA & National CAD Standard Layer Format, Decoded
Standard Paper Sizes
Metric ISO, Imperial ANSI and USA Architectural are the worlds top standards for paper sizes. Of these metric is number one! Metric ISO Sheets An A0 sheet is 1m². This allows paper weights to be expressed in grams per square meter. Example: 110gsm paper. The ratio - length to width - of ISO sheets is 1 to the Square Root 2. A square root is a number that when … [Read more...] about Standard Paper Sizes
Drawing Scale Chart: Metric & Imperial + Free Printable PDF
A drawing scale is one number, and that number does four jobs. Get it right once at the start and the text, the dimensions, the hatching and the linetypes all come out at the size you meant. Get it wrong and every one of them is wrong together — which is why “my text is too small” is the most common thing a new drafter ever asks. paper height × … [Read more...] about Drawing Scale Chart: Metric & Imperial + Free Printable PDF
SI Units and Symbols
SI Base UnitsQuantity Name SymbolNameSymbollengthmetermmasskilogramkgtimesecondselectric currentampereAthermodynamic temperature*kelvinKluminous intensitycandelacdamount of substancemolemol … [Read more...] about SI Units and Symbols
Pen Sizes and Line Types (Metric)
By Steve Colors on the old drafting pens The ISO defines a set of standard metric line widths for drafting. Like the ISO A and B series sheet sizes, the pen sizes increase by a factor of 2. This allows additions and corrections to be made on the enlargements or reductions of drawings. Each width is assigned a color code. The color code corresponds to that for the matching … [Read more...] about Pen Sizes and Line Types (Metric)