MACDES 0-100

FIRST 100

Planer

A machine tool used in the production of flat surfaces on pieces too large or too heavy or perhaps too awkward to hold in a shaper

Grinding

It consist of shaping a piece by bringing it into contact with a rotating abrasive wheel

Caliper

A tool used in measuring diameters

Dial Indicator

Used to true align machine tools, fixtures, and works, to test and inspect trueness of finished work, and to compare

measurement either heights or depths or many other measurement

Plasticity

The ability of the metal to be deformed considerably without rupture

Laying Out

The shop term used to include the marking of inscribing of center points, circle, arcs, or straight line upon metal surfaces, either curved or flat, for the guidance of the worker

Reaming

An operation of sizing and finishing a hole by means of a cutting tool having several cutting edges

Countersinking

The operation of making a cone shaped enlargement of the end of a hole, as for a recess for a flat head screw

Boring

The operation of enlarging a hole by means of an adjustable cutting tool with only one cutting edge

Pitch Circle

An imaginary circle passing through the points at which the teeth of the meshing gears contact each other

Carriage Bolt

A type of bolt for use in bolting wooden parts together or wood to metal,. It has a portion of shank just underneath a round head, which is designed to keep the bolt from turning in the wood when the nut t tightened

Diametral Pitch

The number of teeth per inch of pitch diameter and which gives some indications of the gear teeth

Circular Pitch

The distance from the center of one tooth of a gear the center of the next consecutive tooth measured of the pitch

Addendum

The portion of the gear tooth that projects above or outside the pitch circle

Deddendum

The portion of the gear tooth space that is cut below the pitch circle and is equal to the addendum plus the clearance

Gear Rack

When meshed with a gear it is used to change rotary motion to reciprocating motion

Worm Gear

A kind of gears for heavy duty works where a large ratio of speed is required and are extensively used in speed reducers

Bevel Gear

A kind of gear to transmit motion from one shaft to another shaft at an angle to the first

Normalizing

The uniform heating of steel above the usual hardening temperatures, followed by cooling freely in air

Quenching

The operation of cooling a heated piece of work rapidly by dipping it in water, brine or oil

Annealing

A method in softening a piece of metal that is too hard to machine and is done by heating steel slowly above the usual hardening temperature keeping it at the heat for ½ to 2 hours then cooling slowly, preferably in a furnace

Tolerance

The total permissible variation in the size of a dimension the difference between the limits of size

Squaring

The operation of machining the end of a work piece to make the end square with the axis

Backslash

The clearance between the tooth profiles of a gear tooth

Dividing Head

A mechanism which usually do the indexing in a machine tool

Abrasive

A material that can wear away a substance softer than itself

Tap

A cylindrical bar of steel with threads formed around it and grooves or flutes running lengthwise in it, intersecting with the threads to form cutting edges. It is used to cut internal threads

Feeler Gage

A set of gages consisting of thin strips of metal of various thickness mounted in a steel case or holder and is widely used for measuring and checking clearances

Slotter

A machine tool which is very similar to a shaper except that the ram reciprocates vertically rather than horizontally

Shaper

A machine tool principally to machine flat or plane surfaces with single -point cutting tool

Stud Bolts

A kind of bolts which has no head an instead has threads on both ends

Independent Chuck

A kind of chuck which has a reversible jaws which could be adjusted separately

Mandrel

A tool which when pressed into finished hole in a piece of work, provides centers on which the piece may be turned or otherwise machined

Universal Chuck

A kind of chuck which should not used where extreme accuracy is required

Knurling

The process of checking or producing checkers on the surface of a piece by rolling checkered depression into the surface

Live Center

Its fits the main spindle of a lathe and is so called because its acts as a bearing surface on which the work rest. It revolves with the work. When compared with the hardness of the dead center in the tailstock, is usually soft, and is so made since it does not work

Chuck

A gripping device with two or more adjustable jaws radially

Cold Heading

Steel Balls for ball bearings are manufactured by

Epicycloids

Addendum of a cycloidal gear tooth

Headstock

In a lathe, it comprises the main spindle, the necessary mechanism for obtaining the various spindle speed and also certain gears which are used to operate the quick change gear mechanism

Gold

A soft yellow metal, known since ancient times a precious metal which values are based.

Quenching

The operation of cooling a heated piece of work rapidly by dropping it in water, brine or oil.

Seal

A device used to prevent leakage of media.

Brazing

A welding operation in which a non -ferrous filler metal melts at a temperature below that of the metal joined but is heated above 450 degree Celsius.

Forging

The process of working metals by the application of sudden blows r by a steady pressure

Milling

The process of producing a variety of surface by using a circular type cutter with multiple teeth.

Annealing

The softening of meals by heat treatment and most commonly consists of heating the metals up to near molten state cooling them very slowly.

Endurance limit

The maximum stress induced in a material when subjected to alternating or repeated loading without causing failure.

Strain

The total deformation measured in the direction of the line of stress.

Elastic Limit

The maximum stress to which a material can be subjected without a trace of any permanent set remaining upon a complete withdrawal of the stress

Strength

The ability of metal to withstand without breaking down is:

Shaping

A machining operation whereby the tool reciprocates and the feed is stationary is called:

Insulators

Any material that retards the flow of electricity used to prevent passage or escape of electric current from conductors.

Mercury

A metallic element and the only metal that is liquid at ordinary temperature

Brass

An alloy of cooper and zinc.

Bronze

Usually a copper - tin alloy is:

Divider

A tool with hardened points used for scribing circles or laying of distances.

Torch

Name of mechanism which a welding operator holds during gas welding and at the end of which the gases are burned to perform the various gas welding operations.

Ultimate stress

The maximum stress to which a material may be subjected before failure occurs.

Endurance point

The maximum stress induced in a material when subjected to alternate or repeated loading without causing failure.

Root

In standard coarse thread bolt, the stress concentration is maximum at:

6 by 37

Which of the following ropes are more flexible?

Saws and Chisels

Tools usually used in wood pattern making in foundry shop.

Stud bolt

Type of bolt commonly used in the construction that is threaded in both ends.

10 to 13

Cast iron flywheels are commonly designed with factor of safety of:

Brush Roller

Which of the type of chain is used in motorcycle?

Small Power

Spiral gears are suitable for transmitting:

Harmonic

The type of cam used for low and moderate speed engines is generally:

Stamping

Gears for wrist watches are generally manufactured by:

Inversely as cube of load

The rated life of a bearing changes:

Cast iron

The best material for brake drum is:

Spring

An elastic body whose primary function is to deflect under load.

Electroplating

Which one is different from the remaining?

Axial relative motion between shafts and hub is necessary

Splines are used when: The power transmitted is low

Between 1400˚C and 1539˚C

Delta iron occurs at temperature of:

Carbon

The most important element that controls the physical properties of steel is:

Injection Molding

The process commonly used for thermo -plastic material is:

Lead

Select the one that has highest specific gravity:

Duralumin

Age - hardening is related with:

Module

Ratio of pitch diameter to the number of teeth.

Cylindrical Cam

How do you call a cam where in the follower reciprocates or oscillates in a plane parallel to its axis?

Stamping

How are gears for watches generally manufactured?

No lubricant

Rope brake dynamometer uses what?

Increases the fatigue strength

Which of the following could be the effect of cold working?

Completely reversed load

In testing a material for endurance strength, it is subjected to:

Fatigue limit by overstressing the metal by successively increasing loadings

Coaxing is the procedure of increasing:

4 mm

Up to what percent thickness of plate, edge preparation for welding is not needed?

Welding stainless steel

Arc blow takes place in:

To connect shaft so that the driven shaft will rotate with the driving shaft and to disconnect them at all

What is the function clutch in the machine tool?

Addendum

The height of tooth above the pitch circle or the radial distance between pitch circle and top land of the tooth.

whole depth

How do you call the distance of the tooth which is equal to the sum of the addendum and deddendum?

High Carbon Steel

A cold chisel is made of what?

Resilience

It is the ability of a material to absorb energy when deformed elastically and return it when unloaded.

Cylindrical Cam

Which of the following cams where the follower reciprocates or oscillates in a plane parallel to the axis of rotation?

Radial Cam

Which of the following cams where the follower reciprocates or oscillates in a plane perpendicular its axis of rotation?

a sudden break

During tensile test, which of the following stress -strain curve(s) fits for a glass rod?

Double Shear

In case of a knuckle joint, the pin is most likely to fail in:

4.0 Hp

A single ply leather belt running at a belt velocity of 300 ft/min is likely to transmit per inch of width:

Homogeneous

How do you call a body having identical properties all over?