vernier calipers, height gauges and bevel protractors

what are the two ways a imperial vernier scales constructed?

- the main scale is divided into inches and tenth of inches and each tenth being subdivided into 4 equal parts. - the matching scale is divided into 25 parts and each of them equaling 0.001 of an inch

what 4 types of measurement can a vernier/dial caliper make?

-external measurements -internal measurements -depth measurements -step measurements

what are the 5 parts of vernier caliper ?

-fixed jaw -sliding jaw -frame -clamping screws -fine adjustment

what are the 5 main parts of a vernier height gauge

-frame -base -scribing blade -measuring blades -fine adjustment

what are the 4 main parts of an vernier bevel protractor

-main scale -vernier scale -blade -stock

how do you check for index error on dial calipers

-make sure jaws are clean -make sure the first graduation line is in line with the zero line. -the last graduation should line up as well - the pointer should line up with zero on the dial

how do you read a dial caliper

-read the closest 5mm on main scale -read the number of whole mm off the dial -read the decimal fraction of a mm off the dial -add the readings together to obtain the final measurement.

what is the purpose of a vernier caliper?

A vernier caliper is generally used when accuracy is not required and also when a micrometer cannot reach.

how do you check for index error with vernier height gauges

make sure scribing blade is clean then lower till the zero lines line up.

how do you correct index error on dial calipers

the bezel can be released to reset the scale back to zero

what must you do when marking out small work when using a vernier height gauge?

use a vee or angle block to support work