Riley takes test I help

What are the three methods used for sizing drill bits and define each

Inches: 1-16inch to 4 inches or larger

letter: A-Z A being the smallest and Z being the largest

Number: Sizes range from No.80 to No. 1 No. 80 being the smallest and No.1 being the largest

Which part of the riveted joint layout procedure requires a distance 75% away from the existing rivet pitch

Transverse pitch

Transverse Pitch

used when two or more rows of rivets are required

75% of the rivet pitch is the distance between both rows

Describe the two types of nomenclature drill bits

General purpose drill bits- used for soft steel, aluminum, and nonmetallic

Carbide Tipped- used for cast iron, cast steel (at high speeds), Ferrous metals

Nomenclature

Angle- 59%

Clearance- 12%

When is the combination method necessary

One piece of steel is too thick, other is too thin - dimpled the second sheet is too thin to be machine countersink

Step 1 (drilling procedures)

Center punching (use a center punch, prevent wandering)

Step 2 (drilling procedures)

Clamping (Done before drilling)

Step 3 (drilling procedures)

Positioning (90 degrees to work, or else drill bit wanders or hole elongation occours

Step 4 (drilling procedures)

Speed and feed (determined by the material being drilled, type of drill bit used, and by the type of drill. High speed and feed must be used on aluminum alloys.)

Step 5 (drilling procedures)

De-burring : removed by using an oversized twist drill bit

Step 6 (drilling procedures)

Cleco Fasteners - temperarily secures posts in a position for drilling

Purpose of drilling

to make holes of the proper size in sheet metal and various other components of the aircraft

Hand drill

used for small jobs where no power is available

used for drilling ¼ inch holes and smaller

Pneumatic drill

compress air

large holes where speed and accuracy are required

Drill press

heavy duty and sensitive drilling

Edge distance

The distance from the center of the rivet to the nearest edge of the metal

What are the inspection procedures for rivets? Step 1

Check for blemishes or deformed heads

Inspect bucktail for proper height and width and for deformities such as slated or off to one size

Remove and replace all rivets that do not meet standards

Rivet guns and the purpose

Fast hitting,Corner riveter, Slow hitting, One-shot, squeeze riviter

Rivet set

A tool with a die in one end for driving a particular rivet

transmits blows from rivet gun to rivet

Bucking bar

shape the bucktail of a solid shank rivet

size and weight depend on the hardness of the rivet

State the different types of solid shank rivets

Counter sunk (Flush), Raised

The different types of solid shank rivets purpose

Countersunk (flushed)- even with the aircraft skin- used where aerodynamic smoothness is necessary

Raised- The rivest head protrudes above the skin of the aircraft. Used where aerodynamics are not a major factor

How are countersunk rivets sized

measured by the top of the head to the bottom of the shank. (graduated by 1/16 inch increments)

How are raised rivets sized

measured from the bottom of the rivet head to the bottom of the shank. Gradulated by the 1/16inch increments

Diameter for rivets

Gradulated by 1/32 inch

Minimum rivet diameter

1 times the thickest sheet. Maximum is the 3x the thickest sheet

Seven procedures to solid rivet removal and what happens if the hole is elongated (1)

File a flat surface on raised head rivets

Seven procedures to solid rivet removal and what happens if the hole is elongated (2)

Center punch the center of the rivet

Seven procedures to solid rivet removal and what happens if the hole is elongated (3)

Select a twist drill slightly smaller than the shank

Seven procedures to solid rivet removal and what happens if the hole is elongated (4)

Drill the rivet head only, not the shank

Seven procedures to solid rivet removal and what happens if the hole is elongated (5)

Break off the head of the rivet with drift punch

Seven procedures to solid rivet removal and what happens if the hole is elongated (6)

Punch out remaining rivet shank and bucktail

Seven procedures to solid rivet removal and what happens if the hole is elongated (7)

Retrieve shank and bucktail - if hole elongates, consult specific structural repair manual

Two types of blind rivets

Mechanical lock, friction lock