Page 45 - CITS - Fitter - Trade Theory

FITTER - CITS

Tap wrench
Tap wrench is a device which is used to drive the hand taps.

Types
1 Solid tap wrench
2 Adjustable tap wrench

Hand taps are picked up with tap wrenches. The square of the tap is screwed tight between the adjustable
clamping jaws. Due to the adjustability of the clamping jaws, taps with different square sizes can be fixed. The
clamping jaws are moved by turning an arm of the tap. The length of the arms of the tap wrench creates a leverage
effect which facilitates cutting by hand. Screw extractors or hand reamers can also be operated with a tap wrench.
Due to the design of the tap iron, the plumb line of the tap is facilitated. The design elements of the adjustable tap
wrench have been known for over 100 years and have remained almost unchanged since then. The materials,
however, have changed. Today the bodies are mainly made of zinc die-cast instead of grey cast iron.
3 T- Hand tap wrench
Handle tap wrenches, ideal for holding taps, reamers, screw extractors and other such small hand turned tools,
handle tap wrench allows you to turn taps to help make screw threads. Fixed wrench has an extended shank for
hard-to-reach tapping jobs. Fixed “T” handle for tapping in open areas.

Different types of drills and its parts, functions and uses

Introduction of drill and their nomenclature
Introduction of drill
Drilling is the production of cylindrical holes of definite diameters in workpieces by using a multi-point cutting tool
called a ‘drill’.

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CITS : CG & M - Fitter - Lesson 4