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screw metrology
BNB
SCREW
 FASTEN
 POWER
 CRESAT
 ROOT
 MAJOR DIAMETER
 MINOR DIIAMETER
 PITCH
 LEAD
 DEAPTH
Screw metrology
Screw metrology
measurements
(i) Major diameter,
(ii) Minor diameter,
(iii) Pitch diameter,
(iv) Pitch,
(v) Included angle,
(vi) Thread form,
(vii) Thread flank angle, etc.
Errors in Major and Minor
Diameters
This error is due to improper machine
setting. Errors on major and minor
diameter will cause.
(a) Interference between mating threads,
preventing engagement between mating
bolt and nut.
(b) Reduction in flank contact, if the
error is in the other direction. It may
lead to and excessive weakening of the
threads and too much slackness
between the mating parts
Errors in Pitch
(a)Progressive Error
(b)Periodic Error
(c) Erratic Error
Screw metrology
Inspection of Screw Threads
Ring Screw Gauge
The Ring screw gauge has similar principle
to a plain ring gauge, except that screw
threads are cut on the inner surface of the
ring screw gauge.
Ring screw gauge in used to check screw
threads on outside of cylindrical objects like
bolts and shafts. They may be Go and
Not-Go types.
Plug Screw Gauge
Thread Caliper Gauge
Measurement of Major Diameter
Screw metrology
Measurement of Minor Diameter
Pitch measurement
 Pitch measuring machine
 Tmm
 Screw pitch gauge
Screw pitch gauge
pic working
Pitch measuring machine
Screw metrology
Screw metrology

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Screw metrology