PowerPoint to accompany
Session 1
Inside and Depth
Measuring Instruments
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 an
outside micrometer to determine actual size
• Most common: inside calipers, small hole gages,
telescope gages
6-2
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
6-3
Inside Micrometer Caliper
6-4
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
6-5
Inside Micrometers
• Used for internal measurements larger than
1.500 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
6-6
Inside Micrometers
6-7
Inside Micrometer
6-8
Inside Micrometer
6-9
Inside Micrometer
6-10
Inside Micrometer
6-11
Inside Micrometer
6-12
To Measure with Inside Micrometer
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6-13
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 set
screw
Adjust micrometer to slightly less than diameter to
be measured
Hold head in fixed position, adjust micrometer to
hole size while moving rod end in arrow direction
Remove micrometer and note reading
Add length of extension rod and collar
Inside Micrometer
6-14
Inside Micrometer
6-15
Inside Micrometer
6-16
Inside Micrometer
6-17
Inside Micrometer
6-18
Intrimik
• Consists of head with three contact points
spaced 120º apart attached to micrometer
• Contact points forced out
to contact inside of hole
• Self-centering
• Provides direct reading
• Range: .275 to 12.000 in
• Accuracy: .0001 - .0005 in
6-19
Transfer-Type Instruments
• Size of object taken with instrument not
capable of giving direct reading
• Small hole gages for small measures
– Sets of four
– Range: .125 - .500 in.
Have small, round end or ball
6-20
Have flat bottom
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
6-21
Bore Gages
6-22
Bore Gages
6-23
Bore Gages
6-24
Bore Gages
6-25
Dial Bore Gages
• Used to check hole diameters and bores for
size, 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
6-26
Depth Measurement
6-27
Depth Gages
6-28
Vernier Depth Gage
6-29
Vernier Depth Gage
• Measures depths of holes, slots and recesses
• Read same as standard
vernier caliper
Checking position of
toolmaker's buttons using
a vernier depth gage
6-30
Dial Depth Gage
6-31
Electronic Digital Depth Gage
6-32
Depth Micrometers
6-33
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
6-34
Depth Dial Gages
6-35
Depth Micrometer
6-36
To Measure with a
Micrometer Depth Gage
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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 of
extension rod touches bottom of hole
• Recheck micrometer setting
• Carefully not reading
Numbers on thimble and
sleeve are reverse
of standard micrometer.
6-37
Digital Depth Micrometer
6-38
Electronic Digital Depth
Micrometer
6-39
Depth Dial Gages
6-40
Depth Dial Gages
6-41
Electronic Digital Depth Gages
6-42
Electronic Depth Gages
6-43
Depth Micrometer Reading
6-44
Depth Micrometer Reading
.500
.025
.010
.535
6-45
Depth Micrometer Reading
.800
.000
.015
.815
6-46
Depth Micrometer Reading
.700
.025
.007
.732
6-47
Depth Micrometer Reading
.600
.025
.022
.647
6-48
Other Depth Measurement
6-49
Other Depth Measurement
6-50
Other Depth Measurement
6-51
Other Depth Measurement
6-52
Other Depth Measurement
6-53