MACH Reading Section 4 Unit 1-3

____ is the distance that a point on the circumference of a rotating cutting tool travels in 1 minute.

Cutting speed

____ refers to the movement, or advancement, of the cutting tool into the workpiece, and feed rate is the term used in the shop to describe this.

Feed

Feed rates for drill press operations are specified in ____.

IPR

The ____ taper is a popular standardized style of taper used in drill press spindles and for holemaking tools.

Morse

The ____ is most often used when a hole is to be drilled perpendicular to a large flat surface on the workpiece.

angle plate

Holes that are only drilled partially through a workpiece are called ____.

blind holes

The drill ____ extends from the tip to the beginning of the shank and makes up the majority of the drill bit.

body

The ____ is the area just behind the margin and is slightly smaller in diameter assuring that it does not rub on the walls of the hole during drilling.

body clearance

The ____ does no actual cutting but is instead forced into the material when drilling.

chisel edge

To remove a taper-shank tool from the drill press spindle, a wedge-shaped ____ is inserted between the tapers through an opening in the spindle and lightly tapped with a hammer.

drill drift

The ____ is the cone-shaped area at the very tip of the drill bit.

drill point

A ____ drill press contains multiple drilling heads attached to a single base and worktable.

gang

Lip clearance is the relief angle from the lips back to the ____.

heel

The ____ is the angle of a drill's spiral relative to the center axis of the drill.

helix angle

The ____ of a drill are the angled cutting edges that shear the metal into chips as the drill rotates.

lips

A relative measure of how easily a material can be machined is called its ____.

machinability

The ____ is a thin raised strip that runs the length of the drill body along the edge of the flutes and gives the drill bit its diameter.

margin

A(n) ____ drill press operates at very high spindle speeds and is used to produce very small holes.

micro

The alternating drilling and retracting motion of a quill to clear chips from the point is called ____.

pecking

A counterbore has a guide on its end called a(n) ____ that keeps the counterbore aligned in the existing hole.

pilot

When the desired hole is larger than 1/2" in diameter, a smaller hole called a ____ is often drilled before the larger drill bit is used.

pilot hole

The ____ chuck is a micro drill chuck that has a much slimmer design, has a smaller capacity, and will enable very small drills to run truer than a larger chuck.

pin vise

The ____ drill press is the largest of the drilling machines.

radial-arm

A drill press without a power-feed mechanism is sometimes called a ____ drill press because the operator can "feel" the cutting action of the tool and adjust the rate of feed for optimal cutting pressure by increasing or decreasing pressure on the feed handle.

sensitive

The ____ of a drill bit provides an area for mounting the drill bit into a holder.

shank

Morse taper ____ adapters increase the size of a tool's shank taper.

sleeve

The ____ is the part of the drill press that holds and rotates the cutting tool.

spindle

After the workpiece is positioned and securely clamped, a center drill is usually used to create a more positive starting point for a twist drill. This operation is sometimes called ____.

spotting

A ____ head is a specially designed tool that allows the spindle to be run to drive taps.

tapping

Holes that are drilled entirely through a workpiece are called ____.

thru holes

The ____ drill press consists of a column mounted at 90 degrees to a base.

upright

A ____ is sometimes used to position the workpiece under the center of the drill press spindle.

wiggler