Forging new generations of engineers

The English System of Measurement

How precise do I need to be?• We need to be able to accurately measure

to the .001th

.125

Decimal to Fraction Conversions

• .125 = 1/8”• .250 = 1/4”• .375 = 3/8”• .500 = 1/2”• .625 = 5/8”• .750 = 3/4”• .875 = 7/8”• 1. = 1”

• .0625 = 1/16”• .1875 = 3/16”• .3125 = 5/16”• .4375 = 7/16”• .5625 = 9/16”• .6875 = 11/16”• .8125 = 13/16”• .9375 = 15/16”

Tools used in Precision Measurement

• Gage Blocks: These are used throughout industry as primary standards and have accuracy to a few millionths of an inch.

Gage Blocks

Micrometers

Sleeve

ThimbleRatchet Stop

Dial Caliper

Dial Indicators