Countersinking Tools

The most common countersink angle in the aerospace industry is ________. Select one: a. 60° b. 82° c. 90° d. 100°

100

Which of the following is not a material that is commonly used for countersink tools? Select one: a. High-speed steel b. Carbide c. Cobalt d. Aluminum

aluminum

Countersink tools are identified by the size of the body, the countersink ________, and the size of the pilot. Select one: a. Radius b. Angle c. Diameter d. Length

angle

A ________ countersink tool is a specialized tool designed to chamfer, deburr, or countersink the back side of a drilled hole. Select one: a. Single b. Cross-hole c. Fluted d. Back

back

Three types of countersink tools that you may see in the workplace are fluted, cross-hole, and ________. Select one: a. Back countersink b. Front countersink c. Oval countersink d. Rigid countersink

back countersink

A ________ is a slight edge break or beveled edge on a drilled hole. Select one: a. Chamfer b. Rolled edge c. Counterbore d. Deburr

chamfer

A ________ tool is commonly used to chamfer holes for fillet relief. Select one: a. Counterbore b. Deburr c. Countersink d. Drilling

countersink

For the top of a flush head fastener to sit flush with the surface of the material, the drilled hole must be ________. Select one: a. Counterbored b. Counterdrilled c. Double drilled d. Countersunk

countersunk

A ________ countersink is a cone-shaped tool with a cutting edge provided by a hole that goes through the side of the cone. Select one: a. Back b. Single c. Cross-hole d. Fluted

cross hole

What type of surface is the most difficult to countersink? Select one: a. Rough b. Smooth c. Angled d. Curved

curved

A microstop tool is a specialized tool that enables accurate control of the ________ of the countersink. Select one: a. Depth b. Length c. Width d. Circumference

depth

True or False: Countersink angles will vary based upon the material you are cutting. Select one: True False

false

True or False: Only flush head fasteners have a fillet under the head of the fastener. Protruding head fasteners do not have fillets. Select one: True False

false

True or False: The countersink pilot should be .006 to .008 inches smaller than the diameter of your drill bit. Select one: True False

false

True or False: When countersinking, you should apply firm pressure and countersink quickly for a smooth finish. Select one: True False

false

True or False: When setting up your countersink, always start with a deep depth and decrease depth as needed. Select one: True False

false

Most types of bolts and other fasteners have a slight radius at the transition between the shank and head that helps distribute the stress load on the fastener. This radius is commonly called a ________. Select one: a. Chamfer b. Fillet c. Counterbore d. Countersink

fillet

The ________ is a deep groove that twists around the cutting edge, giving the waste material a path out of the hole. Select one: a. Cutting edge b. Shank c. Flute d. Pilot

flute

The ________ countersink cutter is used to provide a heavy countersink or chamfer in the entrance of a drilled hole. Select one: a. Cross-hole b. Fluted c. Back d. Single

fluted

The most common countersink tool used in airplane assembly is a ________ countersink tool. Select one: a. Cross-hole b. Fluted c. Back d. Folded

fluted

Carbide and cobalt countersink tools are sometimes manufactured with specialized coatings that ________. Select one: a. Keep them sharp longer b. Prevent shavings from sticking to the blades c. Prevent rust

keep them sharp longer

The countersink ________ is designed to keep the countersink tool accurately centered in the drilled hole. Select one: a. Pilot b. Flute c. Cutting edge d. Shank

pilot

Always use a cage with a nylon foot or use ________ around the hole when countersinking the surface of a workpiece. Select one: a. Scotch tape b. Protective tape c. Tacky tape d. Duct tape

protective tape

On surfaces that have minimal concave or convex curved surfaces, using a ________ cage is recommended. Select one: a. Enlarged diameter b. Standard diameter c. Reduced diameter

reduced diameter

Which of the following is not a major component of a countersink tool? Select one: a. Cutting edge b. Roundover tip c. Flute d. Pilot

roundover tip

The countersink ________ is the part of the countersink tool that is held in the drill chuck. Select one: a. Flute b. Shank c. Pilot d. Cutting edge

shank

What is one of the most common reasons to chamfer a hole? Select one: a. To enlarge the entire hole diameter b. To rough up the edges of the hole c. To provide fillet relief for fasteners d. To make a hole smaller

to provide fillet relief for fasteners

True or False: Before countersinking on the production part, you should check the depth of each practice countersink with a countersink gauge. Select one: True False

true

True or False: Carbide and cobalt tools are capable of cutting in harder materials, like titanium and composites. Select one: True False

true

True or False: Countersinking creates a conical recess at the top of a hole intended to accommodate a fastener. Select one: True False

true

True or False: It is important to make several practice countersinks in a similar piece of scrap material before countersinking on the production part. Select one: True False

true

True or False: On the microstop tool, the adjustment sleeve allows you to adjust the cutting depth of the countersink cutter. Select one: True False

true

True or False: One of the advantages of the cross-hole countersink is that its cutting edge is curved. Because it is curved, it is longer than the cutting edge of the fluted countersink tool. Select one: True False

true

True or False: The term countersink is also commonly used to refer to the tool used to cut a countersunk hole. Select one: True False

true

True or False: Using a lubricant can help extend the life of the countersink cutter. Select one: True False

true

True or False: When countersinking, the head of the fastener should sit flush or slightly above the surface of the surrounding structure. Select one: True False

true

True or False: When countersinking, you hold the drill motor as you would for a standard drilling operation. Select one: True False

true

The cross-hole countersink tool is also commonly referred to as the ________ countersink tool. Select one: a. Wheeler b. Wyndom c. Weldon d. Wyoming

weldon