Inside and Depth Measurement2

7/29/2019 Inside and Depth Measurement2

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PowerPoint to accompany

Inside and Depth

Measuring Instruments

Session 1


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Inside-Measuring Instruments

Two Categories

Direct-reading

Size of hole read on instrument used to measure hole Most common: inside micrometer, Intrimik, vernier

caliper

Transfer-type

Set to diameter of hole then size transferred to anoutside micrometer to determine actual size

Most common: inside calipers, small hole gages,telescope gages


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Direct-Reading Instruments

Inside micrometer calipers

Designed for measuring holes, slots and grooves

0.200 to 2.000 in or 5-50 mm

Nibs of jaws hardened and ground to small radius

Permit accurate measurement

Locking nut used to lock at desired size Based on same principle as standard micrometer

Special-purpose tools not used in mass production


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Inside Micrometer Caliper


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To Use an Inside

Micrometer Caliper Adjust jaws to slightly less than diameter to

be measured

Hold fixed jaw against one side of hole and

adjust movable jaw until proper "feel"

Move movable jaw back and forth to ensure

measurement taken is across true diameter

Set lock nut, remove instrument and check

reading


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Inside Micrometers

Used for internal measurements larger than1.500 in. or 40 mm.

Set consists of

Micrometer head with range of .500 or 1 in.

Several extension rods of different lengths

.500 in. spacing collar

Set cover range 1.5000 to over 100 in.

Large sets have hollow rods for strength

Read same manner as standard micrometer


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Inside Micrometers


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Inside Micrometer


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Inside Micrometer


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Inside Micrometer


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Inside Micrometer


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Inside Micrometer


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To Measure with Inside Micrometer

Measure size of hole with rule

Insert correct extension rod

Align zero marks on rod and micrometer head

Hold rod firmly against head, tighten knurled setscrew

Adjust micrometer to slightly less than diameter tobe measured

Hold head in fixed position, adjust micrometer tohole size while moving rod end in arrow direction

Remove micrometer and note reading

Add length of extension rod and collar


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Inside Micrometer


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Inside Micrometer


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Inside Micrometer


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Inside Micrometer


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Inside Micrometer


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Intrimik

Consists of head with three contact pointsspaced 120 apart attached to micrometer

Contact points forced outto contact inside of hole

Self-centering

Provides direct reading Range: .275 to 12.000 in

Accuracy: .0001 - .0005 in


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Transfer-Type Instruments

Size of object taken with instrument notcapable of giving direct reading

Small hole gages for small measures Sets of four

Range: .125 - .500 in.

Have small, round end or ball Have flat bottom


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Transfer-Type Instruments

Telescope Gages

Used to obtain size of holes, slots, and recesses

from .3125 to 6.000 in.(8 to 152 mm)

T-shaped: pair of telescoping

tubes connected to handle Knurled knob on handle end

locks plungers into position


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Bore Gages


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Bore Gages


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Bore Gages


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Bore Gages


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Dial Bore Gages

Used to check hole diameters and bores forsize, out-of-round, taper, bellmouth,

hourglass, or barrel shapes Gaging accomplished by three spring-loaded

centralizing plungers in head

One actuates dial indicator

ten-thousands of inch or 0.01 mm graduations

Six sizes cover range 3-12 in or 75-300 mm

Extensions increase range


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Depth Measurement


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Depth Gages


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Vernier Depth Gage


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Vernier Depth Gage

Measures depths of holes, slots and recesses

Read same as standard

vernier caliper

Checking position oftoolmaker's buttons using

a vernier depth gage


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Dial Depth Gage


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Electronic Digital Depth Gage


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Depth Micrometers


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Micrometer Depth Gage

Used for measuring depth of blind holes,slots, recesses, and projections

Consists of flat base attached to micrometer

sleeve Extension rod of required length fits through

sleeve and protrudes through base

Held in position by threaded cap on top of thimble

Come in various lengths up to 9.000 in. (225 mm)

Screw has range: .500 or 1.000 in (25mm)

Available with either round or flat rods


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Depth Dial Gages


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Depth Micrometer


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To Measure with a

Micrometer Depth Gage Remove burrs from edge of hole and face

Clean work surface and base of micrometer

Hold micrometer base against work surface

Rotate thimble lightly until bottom ofextension rod touches bottom of hole

Recheck micrometer setting Carefully not reading Numbers on thimble and

sleeve are reverse

of standard micrometer.


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Digital Depth Micrometer


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Electronic Digital Depth

Micrometer


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Depth Dial Gages


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Depth Dial Gages


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Electronic Digital Depth Gages


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Electronic Depth Gages


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Depth Micrometer Reading


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.500

.025

.010

.535


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.800

.000

.015

.815


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.700

.025

.007

.732


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.600

.025

.022

.647


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Other Depth Measurement


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Documents

Inside and Depth Measurement2