Page 17 - Fitter 1st Year TT

MeasuringInstrument 68.Form internal threads with taps to their uses, determining hole size (or
- Vernier, Screw standard size (through holes and blind reaming), Reaming procedure.
Gauge,Micrometer] holes). (3 hrs.) Screw threads: terminology, parts,

CSC/N0304 69.Prepare studs and bolt. (13 hrs.) types and their uses. Screw pitch
gauge: material parts and uses.
Taps British standard (B.S.W.,
B.S.F., B.A. & B.S.P.) and metric /
BIS (coarse and fine) material, parts
(shank body, flute, cutting edge).
(03 hrs.)

70.Form external threads with dies to Tap wrench: material, parts, types
standard size. (08 hrs.) (solid &adjustable types) and their
uses removal of broken tap, studs
71.Prepare nuts and match with bolts. (15 (tap stud extractor).
hrs.)
Dies: British standard, metric and BIS
standard, material, parts, types,
Method of using dies. Die stock:
material, parts and uses. (06 hrs.)

72.File and make Step fit, angular fit, angle, Drill troubles: causes and remedy.
surfaces (Bevel gauge accuracy 1 Equality of lips, correct clearance,
degree). (12 hrs.) dead centre, length of lips. Drill
73.Make simple open and sliding fits. (08 kinds: Fraction, metric, letters and
numbers, grinding of drill. (04 hrs.)
hrs.)
Grinding wheel: Abrasive, grade
74.Enlarge hole and increase internal dia. structures, bond, specification, use,
(2 hrs.)
mounting and dressing. Selection of
75.File cylindrical surfaces. (5 hrs.) grinding wheels. Bench grinder parts
76.Make open fitting of curved profiles. and use. (04 hrs.)
(15 hrs.)

77.Correction of drill location by binding Gauges- Introduction, necessity,
previously drilled hole. (04 hrs.) types. Limit gauge: Ring gauge,
snap gauge, plug gauge, description
78.Make inside square fit. (16 hrs.) and uses.
Description and uses of gauge- types
(feeler, screw, pitch, radius, wire
gauge). (05 hrs.)

Professional Make different fit of 79.Make sliding 'T' fit. (21 hrs.) Interchange ability: Necessity in
Skill 126Hrs; components for Engg, field definition, BIS. Definition,
assembling as per
Professional required tolerance types of limit, terminology of limits
Knowledge observing principle and fits-basic size, actual size,
28Hrs of interchange deviation, high and low limit, zero
ability and check line, tolerance zone Different
standard systems of fits and limits.
for functionality. British standard system, BIS
[Different Fit - system. (05 hrs.)
Sliding, Angular,
Step fit, 'T' fit,
Square fit and
Profile fit; Required
tolerance: ±0.04
mm, angular
tolerance: 30 min.]
CSC/N0304

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