materials and processes (semester 1)

A

External jaws

B

Main scale

C

Vernier scale

D

Internal jaws

The external jaws meausre the

Inside diameter

Internal jaws measure

Outside diameter

Micrometer definition

Precision measuring tool having capability to measure accurately up to .0001 inch

Vernier caliper definition

Precision measuring tool that combines a caliper and a scale for measurements

When was micrometer invented and by who

By William Gascoigne 1600s

Ok who improved on Gascoigne invention

Jean Louis palmer

Which is one more precise (vernier or micrometer)

Micrometer

What is the main type of micrometer used by AMTs

Outside micrometer

#1

Anvil

#2

Spindle

#7

Frame

#4

Thimble

the one pointing at the zero

Sleeve

Sleeve or barrel meaures

0.025 every line

Vernier scale measures

0.0001 inch

How is a micrometer recalibrated

Using gauge block between anvil and spindle

Dimension definition

Numerical value that defines the size or geometric characteristic of a feature

Basic dimension

Numerical value defining the theoretically exact size of a feature

Reference dimension

Numerical value enclosed in () provided for info only and not used fr

Dimension line

Thin solid line which shows extent and direction of dimension

Arrows

Placed at the ends of dimension lines to show limits of dimension

Extension line

Perpendicular to a dimension lines indicating which features is associated with the dimension

You install rivets one per..

Inch required