MD Elements 01

A machine tool used for production of flat surfaces or pieces too large or too heavy to hold in a shaper.

Planer

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

Shaper

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

Dedendum

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

Quenching

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

Tolerance

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

slotter

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

Mandrel

Fusion process in which the metal is heated into a state of fusion permitting it to flow together into a solid joint.

electric arc welding

A hand tool used to measure tension on bolts.

Torque wrench

A hand tool used to measure engine crank web deflection.

Distortion gage

The gear with teeth on the outer cylindrical surface.

External gear

The diameter of a circle coinciding with the top of the teeth of an internal gear.

internal diameter

The total depth of a tooth space, equal to addendum plus dedendum.

Whole depth

A machine tool in which an abrasive wheel is used as a cutting tool to obtain a very smooth finish.

Grinder

It is used principally to machine flat or plane surfaces with a single-point tool.

Shaper

Cutting a hole by means of a rotating tool while the work may revolve and the tool remains fixed as in the lathe.

Boring

The moment of inertia of a rectangle whose base is "b" and height "h" about its base.

bh3/3

One of the following is not a common term relating to the classification of fits.

Bound

Hearingbone gears are gears which:

Have a line of contact between the teeth

Internal stresses existing in a welded connection:

Are not relieved when the weld is peened

In general, the design stress and factor of safety are related as follows.

Design stress = ultimate stress divided by factor of safety

A group of thin steel strips for measuring clearances.

Feeler gage

An alloy of copper and zinc.

Brass

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 C.

Brazing

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

Quenching

A machine tool used to measure flat surfaces

shaper

Heating above transformation range usually,1300 F to 1350 F, and cooling slowly to soften the metal and increase in machining

Annealing

Heating above the transformation temperature and quenching usually in oil, for the purpose of increasing the hardness:

Hardening

The process of forming metal parts by the use of a powerful pressure from a hammer or press to obtain the desired shape, after the metal has been heated to its plastic range

forging

A machine tool used to form metal parts by removing metal from a workplace by the use of a revolving cutter with many teeth each tooth having a cutting edge which removes its share of the stock

Milling machine

A machine too used to finish internal or external surfaces, such as holes or keyways by the use of cutter called a broach, which has a series of cutting edges or teeth

Broaching machine

Used to true and align machine tools, fixtures, and works, to test and inspect the size trueness of finished work, and to compare measurement either heights or depths or many other measurements

Dial indicator

A manganese steel containing approximately 0.20% carbon

SAE 1320

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

tightened.

Carriage bolt

A machine tool used to enlarge a hole by means of an adjustable cutting tool with only one cutting edge

Boring machine

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

Worm gears

When meshed gear, it is used to change rotary motion to reciprocating motion

Gear rack

The distance form the center of one tooth of a gear to the center of the next consecutive tooth measured on the pitch

Circular pitch

A material that can wear away a substance softer than itself

abrasive

Steel ball for ball bearings are manufactured by:

Cold heading

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

Shaper

Uniting two process of metal by means of a different metal which is applied between the two in molten state

Soldering

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

Addendum

The depth of tooth space below the pitch circle

Dedendum

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

normalizing

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

knurling

A metal turning machine tool in which the work, while revolving on a horizontal axis, is acted upon by a cutting tool which is made to move slowly (feed) in a direction more or less parallel to the axis of the work (longitudinal

feed

Lathe machine

Galvanized iron is a term referring to iron coated with:

Zinc

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

Tolerance

A machine tool used to sharpen or shape tools by using an abrasive wheel

Tool grinder

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

countersinking

A stainless steel is obtained principally by the use of the following alloying element

chromium

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

Stud bolts

A machine tool in which metal is removed by means of a revolving cutter with many teeth, each tooth having a cutting edge which removes its share of the stock

Milling machine

A gripping device with two or more adjustable jaws set radially

chuck

Joining metal by means of high current at low voltage. During the passage of current, pressure by the electrodes produces of forge weld

Resistance welding

A machine tool used for producing holes in metal by the use of a cutting tool called drill

Drilling machine

An alloy copper and tin

bronze

A circle coinciding with a tangent to the bottom of the tooth space

Root circle

The process of heating a piece of steel to a temperature within or above critical range and cooling rapidly

Hardening

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 clearance

Feeler gage

An alloy of copper, tin and small amount of phosphoru

bronze

One of the following is not a tap used for cutting threads in holes

Tapping tap

An index or dividing head

Used to rotate the work

A machine tool used to cut metals part of light, medium, and large sections using a reciprocating hacksaw blade

Power saw

The of gear teeth to each mm pitch diameter

Diametral pitch

Heating to a subcritical temperature, about 1,100 F to 1300 F and holding at a temperature for a suitable time for the purpose of reducing internal residual stresses

Stress relieving

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

Universal chuck

Heating to some 100 F above the transformation range with subsequent cooling to below that range still air at room temperature to produce uniform structure of the metal

Normalizing

A method used 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

annealing

The process of working metals by the application of sudden blows or y steady

pressure

forging

A device for accurately measuring diameters

Micrometer

It is used to produce a variety of surface by using a circular-type cutter with multiple teeth

Milling machine

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

reaming

A material that can wear away a substance softer than itself

abrasive

In usual spur gearing

Tooth outline are usually involute curves

A group of thin steel strips for measuring clearances

Feeler gage

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

Bevel gears

A machine tool used to machine flat or plane surface with a single point cutting tool

Shaper

Reheating to a temperature below the transformation range, followed by any

the desired rate of cooling to attain the desired properties of the metal

Normalizing

A mechanism which usually do the indexing in a machine tool

Dividing head

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

Boring

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

Headstock

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 act internal threads

tap

Addendum of a cycloid gear tooth is:

Epicycloid

An alloy of copper and zinc

brass

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

Laying out

Welding operation in which a non-ferrous

filler metal melts at a temperature below that

of the metal joined but is heated above 450 C

Brazing

The ability of metal to be deformed considerably without rupture

plasticity

A tool used in measuring diameters

caliper

The operation of machining the end of a workpiece to make the end square with the

squaring

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

Diametral pitch

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

grinding

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

Pitch circle

The material used in high speed processes

High speed metal

The clearance between the tooth profiles of a gear tooth

backlash

A hand tool used to measure tension on bolts

Torque wrench

The process of forming metal parts by the use of dies after the metal is heated to its plastic range

rolling

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

Independent chuck

It fits to the main spindle of a lathe and is so called because it acts as a bearing surface on which the work rests. It revolves with the work. When compared with the hardness of the dead center in the tailstock, it is usually

soft, and is so made since it does no work.

Live center