GSTD 2 Exam Reviewer

Flashcards based on the provided lecture notes.

What is sectioning?

Sections are used to clarify interior construction that cannot be clearly described by hidden lines in exterior views

What are the six types of sectional views?

Full section, Half section, Offset section, Revolved section, Broken-out section, Aligned section

What is a full section?

Imaginary cutting plane passes through entire object, splitting it in two.

What is a half section?

Imaginary cutting plane that bends at a right angle and cuts only half of the object.

What is an offset section?

Irregular-shaped cutting plane, revealing only desired components; bends are always 90 degrees.

What is a revolved section?

Effective for elongated objects.

What is a broken-out section?

Only a small part of the object needs viewing; irregular cut line removes a section of the object.

What is an aligned section?

To include a certain angled element in a section.

What are the characteristics of section lines?

Symbols are chosen according to the material of the object, thin lines, generally drawn at a 45 degrees angle.

What are the four organizations that standardize screw threads?

International Organization for Standardization, Industrial Fasteners Institute, American National Standards Institute, American Society of Mechanical Engineers

What is the axis of a screw thread?

Center line of the thread

What is the crest root of a screw thread?

Gap between the exterior flanks

What is the root of a screw thread?

Gap between the interior flanks

What are the flanks of a screw thread?

Lines that connects the crest and roots

What is the pitch of a screw thread?

Distance between each flanks

What are external threads?

Outside threads of screw/bolt

What are internal threads?

Inside threads of a nut

What is the height or depth of a thread?

Height of the flanks from crest to root

What is the minor diameter of a screw thread?

Diameter of the root

What is the major diameter of a screw thread?

Diameter of the crest

What is a sharp V screw thread form?

V-shaped flanks at 60 degrees angle

What is a unified screw thread form?

V-shaped flanks at 60 degrees angle, has a flat crest and curved root

What is a buttress screw thread form?

V-shaped flanks with 45 degrees angle on the left flank and 1 degrees angle at the right flank, has a flat crest and curved root

What is a knuckle screw thread form?

Connecting alternate pattern of a diameter

What is an American National screw thread form?

V-shaped flanks at 60 degrees angle, has a flat crest and root (shorter crest and root than METRIC)

What is a Square screw thread form?

Connecting alternate pattern of a square

What is a metric screw thread form?

V-shaped flanks at 60 degrees angle, has a flat crest and root (longer crest and root than AMERICAN NATIONAL)

What is an ACME screw thread form?

V-shaped flanks at 29 degrees angle, has a flat crest and root

What is a trapezoidal metric screw thread form?

V-shaped flanks at 30 degrees angle, has a flat crest and root

What are the three types of screw thread representation?

Pictorial representation, schematic representation, simplified representation

What is pictorial representation of a screw thread?

Approximation of the actual thread form, used for threads having large major diameters (usually more than 25mm).

What is schematic representation of a screw thread?

Used for screw threads that have major diameters less than 30mm.

What is simplified representation of a screw thread?

Most used method of showing screw threads, applicable with small major diameter.

What are the three types of inclined surfaces along intersections of two surfaces?

Edge, chamfer, fillet

What is an edge?

Edged corner

What is a chamfer?

Sliced corner at a 45 degrees angle

What is a fillet?

Smooth curved corner

What is tap drill portion?

Pointed end of an interior thread.

What is a blind hole?

A hole that is reamed, drilled, or milled to a specific depth without going through the other side of the object.

What is a through hole?

A hole that is made to go completely thought the object, so without the tap drill portion

What are the characteristics of coarse pitch series threads?

Has fewer but larger threads

What are the characteristics of fine pitch series threads?

Has more but smaller threads

What does DP stand for in symbols in methods of dimensioning?

Deep

What does Double stand for in symbols in methods of dimensioning?

Thread start

What does LH/RH stand for in symbols in methods of dimensioning?

Left/right hand

What does M in M20 stand for in symbols in methods of dimensioning?

Metric and the number indicated is the major diameter in mm

What is a single start thread?

Start at one crest and ends to the 2nd crest

What is a double start thread?

Start at one crest, skip the 2nd crest and ends to the 3rd crest

What is a triple start thread?

Start at one crest, skip the 2nd and 3rd crest and ends to the 4th crest

What is the direction of a Right-Handed Thread (RH)?

Run Clockwise

What is the direction of a Left-Handed Thread (LH)?

Run Counterclockwise

What are the classes of screw threads fits?

Free, medium, close

What do the capital letters H and G represent in classes of screw threads fits?

Capital letter denotes for internal threads

What do the small letters h and g represent in classes of screw threads fits?

Small letter denotes for external threads

What are fasteners?

Materials used to connect 2 or more material to a permanent or semi-permanent condition.

What are bolts and nuts used for?

Used to hold two or more pieces of materials together in a semi-permanent method.

What are studs?

Long rod that has thread on both ends.

What are washers?

Small flat ring made of metal, rubber, or plastic placed under a nut or head of a bolt, to have a pressure when tightened. As a spacer or seal.

What are rivets?

Permanent fasteners used to join two sheets or plates of metal.

What are knock down fittings?

Can be put together easily, using only a screwdriver, a drill, mallet or hammer and other basic tools.

What are nut locks?

Unique design that prevents them from loosening when exposed to vibration

What are cap screws?

Fastener used for making mechanical connections between mating objects.

What are machine screws?

Similar to cap screw, used to clamp machine parts but are smaller.

What are set screws?

Used for securing components in place.

What are wood screws?

Sharp pointed screw used for nonstructural, wood-to-wood fastening.

What are wood joints?

Method of combining woods together without the use of screws, different methods are used on different scenarios to achieve full capacity of the object.

What is a Butt Joint?

Two pieces of material are joined by simply placing their ends together without any shaping.

What is a Dado Joint?

Made from three-sided channel cut across the grain of one workpiece.

What is a Dowel Joint?

Assembled in the same way you would screw a regular joint together, pieces of dowel are glued and inserted into holes instead of screws.

What is a Lap Joint?

Joint in which the members overlap

What is a Miter Joint?

Made buy cutting each part to be joined, usually at a 45 degrees angle to form a corner of 90 degrees angle.

What is a Mortise and Tenon Joint?

Basic type of mortise and tenon has two components, mortise hole and tenon tongue.

What is a Through Dovetail Joint?

End grain of both boards is visible, trapezoid shaped cut.

What is a Tongue and Groove Joint?

Joint that allows wood shrinkage. Cut a rectangular groove in the edge of one piece and a tongue on the other piece.