Drilling Techniques

The most common type of drill lubricant is made of solid or liquid ________. Select one: a. Motor oil b. Petroleum jelly c. Linseed oil d. Acetyl alcohol

acetyl alcohol

A ________ hole is one that is not perpendicular to the surface of the material. Select one: a. Angled b. Rifled c. Eyebrowed d. Barreled

angled

In a ________ hole, the hole is the correct size at the surface but bows as it becomes deeper. Select one: a. Barreled b. Rifled c. Angled d. Double

barreled

The process of removing burrs from drilled holes is called deburring. Deburring is not a ________ operation. Select one: a. Countersinking b. Reaming c. Chamfering

chamfering

Edge ________ is measured between the edge of the material and the edge of the hole. Select one: a. Diameter b. Distance c. Margin d. Length

distance

In a ________ defect, the bit walks across the surface of the assembly, marring the surface. Select one: a. Rifled hole b. Barreled hole c. Drill run d. Elongated hole

drill run

A ________ hole occurs when you don’t use a drill guide or drill stop on the drill bit. This may cause the drill bit to shift or become unstable during the drilling process. Select one: a. Double b. Eyebrowed c. Elongated d. Barreled

elongated

In a ________ hole defect, the full size hole is drilled away from the pilot hole. This defect is caused by not looking at the drawing carefully and laying out the pilot holes improperly. Select one: a. Double b. Extra c. Short edge margin d. Rifled

extra

An ________ occurs when you begin drilling a crooked hole, then stop, reorient the drill bit so that it is perpendicular to the material, and continue drilling the hole straight. Select one: a. Undersized hole b. Extra hole c. Elongated hole d. Eyebrowed hole

eyebrowed hole

True or False: A large edge margin hole is a hole that is too close to the edge of the material. Select one: True False

false

True or False: Failure to consult the engineering documentation to determine the correct tools to use when drilling holes or performing other operations will not result in defects to the final hole. Select one: True False

false

True or False: Holding a drill motor improperly will result in safer operation, better control, and superior hole quality. Select one: True False

false

True or False: Your index finger should always operate the drill trigger. Select one: True False

false

The ________ deburr tool is a fine single-cut file. It is best for removing burrs on a single edge of material at a time. Select one: a. Flat file b. Weldon c. Open countersink d. Machinist triangle

flat file

________ drill speeds are used in softer materials, like aluminum alloys and plastics. Select one: a. Higher b. Lower

higher

The proper method for holding a drill is to hold the drill with the ________ of your dominant hand extending down the body of the drill. Select one: a. Index finger b. Thumb c. Middle finger d. Pinky

index finger

A ________ drill speed is typically used in harder materials, like titanium and composites. Select one: a. Higher b. Lower

lower

Drill ________ is made to help minimize heat generation, prevent damage to the part or the drill bit, and make the drill bit last longer. Select one: a. Oil b. Gel c. Fluid d. Lubricant

lubricant

Edge ________ is the distance from the center of the hole to the nearest edge of the material. Select one: a. Distance b. Margin c. Length d. Radius

margin

A hole that is not perfectly circular at the edge is a ________ hole. Select one: a. Barreled b. Elongated c. Eyebrowed d. Out-of-round

out of round

To drill a quality hole, always keep the drill bit ________ to the surface being drilled. This ensures the finished hole will meet angularity requirements. Select one: a. Parallel b. At an angle c. Perpendicular d. Adjacent

perpendicular

Using the correct drill speed and ________ has a significant impact on the quality of a drilled hole and on the life of the drill bit. Select one: a. Angle b. Force c. Pressure d. Hold

pressure

When a hole is ________, it appears slightly grooved on the interior. Select one: a. Angled b. Rifled c. Eyebrowed d. Barreled

rifled

Applying ________ pressure on the drill motor may cause the drill bit to overheat and will most likely result in an oversized or misaligned hole. Select one: a. Too much b. Too little

too much

True or False: A quality hole is one that is drilled in the correct location, perpendicular to the surface of the material, and drilled following drilling best practices. Select one: True False

true

True or False: A quality hole is one that is free of burrs and sharp edges. Select one: True False

true

True or False: Heat is generated whenever material is removed by a cutting tool. A small amount of heat helps in the cutting action by softening the material. Too much heat can cause failure of the cutting tool. Select one: True False

true

True or False: Holes often must undergo other operations to improve their size, smoothness, location, or function. Some of these operations include tapping, reaming, or countersinking. Select one: True False

true

True or False: In a double hole, the full size hole touches the pilot hole, but the pilot hole still exists. Select one: True False

true

True or False: It usually takes one turn of a deburring tool to properly deburr a hole. Select one: True False

true

True or False: The open countersink deburring tool is a double-edge countersink cutter placed in a wooden handle or chucked into a drill motor. Select one: True False

true

A ________ hole is a hole drilled smaller than the required tolerance for full size. Select one: a. Barreled b. Double c. Short edge margin d. Undersized

undersized