by the largest diameter circular piece that can be drilled on center.
Drills are made from
high-speed steel and carbon steel.
Drill sizes are expressed by what four series
numbers, letters, inches/fractions, and metric.
What are two techniquest used to determine a drill's size
a micrometer and a drill gage.
List two types of drill shanks
straight and tapered.
__________ shank drills are used with a chuck.
__________ shank drills fit directly into the drill press spindle
The spiral groves that run the length of the drill body are called
The spiral grooves in a drill body are used to
help form the cutting edge of the drill point; curl chips for easier removal; and, form channels through which the chips can escape from the hole.
Name the device employed to enlarage a taper shank drill so that it will fit the spindle opening.
The device used to permit a drill with a taper shank too large to fit the spindle opening is called a(n)
What is the name of the tool used to separate a taper shank drill from the above devices
Cutting compounds or fluids are used to
cool the drill; improve the finish of a drilled hole; and, aid in the removal of chips.
List the three factors that must be considered when repointing a drill
lip clearance; length and angle of the lip; and proper location of the dead center.
What occurs when the cutting lips of a drill are not sharpened to the same lengths
the hole is larger than the drill and the drill and the drill press are strained.
The __________ should be used frequently when sharpening to ensure a correctly sharpened drill
drill point gage.
The included angle of a drill point sharpness for general drilling is __________ degrees
What coolant shuld be used when drilling cast iron
dry or air jet.
Large drills require a considerable amount of power and pressure to get started. They also have a tendency to drift off center. These conditions can be minimized by first drilling a __________ hole. This hole should be as large as, or slightly larger than, the width of the __________ of the drill point
pilot and dead center.
What is a blind hole
s hole that is not drilled all the way through the work piece.
How is the depth of a drilled hole measured
using a drill press mounted with a depth stop or a depth gage.
The __________ is almost identical to the hand reamer except that the shank has been designed for machine use
A __________ expansion reamer provides rigidity and accuracy not possible with conventional expansion reamers.
How should a reamer be removed from a finished hole
remove the reamer from the hole before stopping the machine.
The cutting speed for a high-speed reamer is approximately __________ that for a similar - size drill
What is the name of the operation employed to cut a chamfer in a shole to receive a flat-head screw
The operation used to prepare a hole for a fillister or socket head screw is called
__________ is the operation that machines a circular spot on a rough surface for the head of a bolt or nut
Name the following parts of a drill
margin, cutting lip, chisel edge/dead center, web, tang, shank body, and flutes.
What drill press is designed to handle large and heavy work
a radial arm drill press.
What tools to employ to increase a hole to a specified diameter
a boring bar and a boring head
What is a through hole
a hole that is drilled, reamed, milled, etc., completely through the substrate.