Chapter 6 Measuring

Objectives Perform measurements using tools in the chapter Have a working understanding of the metric and English systems of measurement

Vernier Caliper Movable scale runs parallel to fixed scale Can measure inside and outside diameter Most will measure 0 to 7 inches in thousandths Can measure depth

Vernier Caliper

Reading Vernier Caliper Main scale is divided into inches Each inch is divided into tenths (0.100") Area between tenth measurement is divided into four segments, each .025"

Reading Vernier Caliper

Micrometers Precision measuring Consistent and accurate measurements Adjusts to compensate for wear

Micrometers

Reading a Micrometer Metric or standard Each rotation of thimble is equal to .025" Four rotations will equal .100" Each line on the thimble represents .001" Some will measure to .0001"

Inside Micrometer Measures cylinder bores and main or rod bearing bores Extension rods to make them fit different size bores

Inside Micrometer

Telescoping Gauge Transfer gauge Different sizes to measure all sizes of bores Ends of tool telescope is out to make contact with bore After lock is set Tool removed from bore and measured with micrometer

Telescoping Gauge

Dial Indicators Measure movements such as back lash and end play Also used to measure wear, taper, and out-of-round

Dial Indicators