7.3 - 7.4 | 暗記メーカー

7.3 - 7.4

32問 • 11ヶ月前

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In files the grade indicates the

degree of coarseness of the teeth

Single cut files are used for cutting hard metals, they have an unbroken series of cuts, parallel with each other but running at

an angle of 60-80° to the length of the file

Flat Chisel

65° is for tool steel. •50° is for mild steel . •30° is for aluminum

Cross-cut chisel The cutting edge varies in width

from 1⁄8” to 3⁄8”.

The chisel is reduced in width behind the cutting edge to

give clearance when cutting grooves

The chisel is forged down to width to give strength to the cutting edge

The point angle varies from 65° for steel to 30° for aluminum.

The choice of blade for a hacksaw is for

soft metal require coarse blades and hard metal require fine blade

The choice of teeth per inch (TPI) of a hacksaw is governed

by the shape and thickness of the material to be cut

At least three teeth

must be in contact with the material at any given time.

Piercing saws - are similar in general shape but the frames are deeper and sometimes adjustable for length. Serrated and hardened clamps ensure a firm grip on the blades, which are 5" long with TPI from 32 to 80

Used for fine sawing if intricate shapes in thin sheet.

A flange spanner is a ring spanner with

very thin walls and a small crank

‘C’ spanner and adjustable ‘C’ spanner This form of spanner is for use on

slotted circular nuts and collars and is available in set sizes or a range of adjustable sizes

Tri-wing Some airlines use screws with a special screw head produced by the Phillips Screw Company.

These screws have three slots instead of the four slots found on the regular cross-point screw

The selection of a punch or drift depend on

item to be fitted or removed, its location and material

What is difference between Gauging and measuring instruments ?

Gauging differs from measuring in that measuring instruments are used to give a direct numerical value to a dimension whilst gauges are used to compare a dimension to a known

Ring gauges check for

dimension, roundness and taper

Micrometers used to take accurate imperia or metric measurement. Used when additional accuracy is required It

reads 0.0001” or 0.002mm by the addition of Vernier scale on the barrel.

Are used to set flush countersink screws and for countersinking prior to riveting

They are made with an included angle of between 60° and 120° depending on the head angle of the fastener to be installed.

A power nibbler is a tool used for rough cutting small-to-medium sized holes in skins

It is hand held and has a reciprocating cutter

When cutting an internal and a mating external thread the

internal thread should be cut first

The flat surface is used for most general-purpose work whilst the ball pein is used

primarily for riveting-type operations

Often with one face flat and the other convex. Faces polished and free of defects

Used for finishing beaten work.

Head of boxwood or lignum vitae. Size specified by diameter of head. Shaft made of cane

Used for shaping internal curves in sheet metal.

A Vernier Calliper is a versatile precision instrument, used to

measure inside and outside dimensions and depth

a Vernier calliper ensure accurate readings

0.02 mm accuracy

The main scale of a metric vernier caliper is

calibrated in millimeter and half millimeter

The sine bar is used to

produce angles using slip gauges.

Imperial unit uses

fractions of an inch

Selection and use of pliers and cutters based on

1- the task to be performed 2- position and access requirement

Drill gauges used for

checking the diameter drills, reamers, and rods

The head of combination set is used to find the centres of circular bars is called

Center head

The main head of combination set has one edge at 90° and the other at 45° to the rule. this head is called

Square head

mod 3 3.1 - 3.2 - 3.3

Yousef Alshammary · 24問 · 12ヶ月前

mod 3 3.1 - 3.2 - 3.3