Inside and Depth Measuring Instruments

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Inside and DepthMeasuring 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
  an outside 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 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

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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 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

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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 points spaced
  120º 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 not capable
  of giving direct reading
• Small hole gages for small measures
• Sets of four
• Range .125 - .500 in.

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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 telescopingtubes connected to
  handle
• Knurled knob on handle endlocks 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 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

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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 of toolmaker'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 aMicrometer 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 of extension
  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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Depth Micrometer Reading
.500
.025
.010
.535
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Depth Micrometer Reading
.800
.000
.015
.815
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Depth Micrometer Reading
.700
.025
.007
.732
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Depth Micrometer Reading
.600
.025
.022
.647
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Other Depth Measurement
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Other Depth Measurement
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Other Depth Measurement
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Other Depth Measurement
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Other Depth Measurement