Measurement, Angles and Tolerances

These tools help with inspection and setup. Convert decimals, fractions and tenths between units, work out a sine bar stack or a taper angle, calculate true position from nominal and measured coordinates and find thermal expansion for a material.

Tools in this group

• Decimal to Fraction Inches Converter — Type a decimal, a fraction or millimetres to get the nearest fraction of an inch and how far off it is; the full chart is below.
• GD&T Symbols Chart — Pick a geometric tolerance symbol to see what it controls, whether it needs a datum, its tolerance zone and a typical use.
• Sine Bar Calculator — Get the gauge block height for any angle on your sine bar, or the angle from a stack, plus the blocks to use from a standard set.
• Taper Angle Calculator — Enter the large and small diameters and the length of a taper to get its included angle, the compound setting and the taper per foot.
• Tenths to Inches Calculator — Enter a size in tenths, thou, mil, inches, microinches or millimetres to see it in every other unit, with the inch value in decimals.
• Thermal Expansion Calculator — Pick a material, enter the length and the two temperatures to see how much the part grows or shrinks and its final length.
• True Position Calculator — Enter nominal and measured coordinates to get true position, then add the feature size to apply the MMC bonus and check pass or fail.