Chapter 12 drills and drilling machines

bench drill

_____ presses can be used to drill holes in small workpieces, but they do not have as many capabilities as the floor models

radial drill press

______ are designed to handle very large drilling work

parallels

______ are often used to level the work and raise is above the vise base

indexable insert

______ drills which use low cost carbide inserts are capable of drilling at much higher speeds that HSS drills

dead center

______ refers to the sharp edge of the extreme tip of the drill

straight shank

______ shank drills are used with a chuck

taper shank

______ shank drills fit directly into the drill press

spotfacing

_______ is the operation that machines a circular spot on a rough surface to provide a bearing surface for the head of a bolt or nut

coolant hole drill

a ______ has coolant holes through the body

chuck

a drill is held in the drill press with a(n) ______

rotating against the material with sufficient pressure

a drill press works by ______

separating the taper from the holding device

a tang assists in driving the tool and ______

solid

a(n) ______ expansion reamer provides rigidity and accuracy not possible with conventional expansion reamers

shell

a(n) ______ reamer is a reamer that is mounted on a special arbor that can be used with several reamer sizes

rose chucking

a(n) ______ reamer is designed to cut on its end

angular or cross-slide

a(n) ______ vise permits angular drilling without tilting the drill press table

drill a hole in a soft metal and observer the chip formation

after sharpening how can drills be tested

titanium nitride

coating drills with ______ greatly increase tool life

cool the drill, improve the finish of the drill, aid in chip removal

cutting fluids are used to ______

the drill is repeatedly inserted and removed from the hole

describe the "pecking technique used in mircodrilling

distance that the drill cutting edge circumference travels per minute

drill cutting speed also known as peripheral speed refers to the ______

numbers, letters, fractional, and metric

drill sizes are expressed by what four series

shearing

drilling machines are used for ______

HSS and carbon steel

drills are made from ______

High Speed Steel (HSS)

drills made from ______ can be operated at much higher cutting speeds than drills made from carbon steel

the use of a pilot hole

even when work is properly centered a large drill may "drift" when starting a hole due to all of the following factors except ______

drill point gage

how can you be sure a drill point is sharpened at the proper angle

chips will come out of the flutes in curlled spirales in equal length and size

how can you tell is a drill has been properly sharpened

the largest diameter circular piece that can be drilled on center

how is drill press size determined

the distance the full hole diameter goes into the work

how is the depth of a drilled hole measured

remove the reamer from the hole before stopping the machine

how should a reamer be removed from a finished hole

the drill is repeatedly inserted and removed from the hole

in a microdrilling operation ______

pilot

large drills require a considerable amount of pressure and power to get started. they also have a tendency to drift off center. these conditions can be minimized by drilling a(n) ______ hole

lip clearance, length and angle of the lips, and proper location of dead center

list three factors that must be considered when repointing a drill

straight shank and taper shank

list two types of drill shanks

parallels, v-blocks, t-bolt, angular vise

name four types of working holding devices used for drilling operations

stamp of the drill or measure with a micrometer

name two techniques that can be used to determine a drill's size

diagonal

portable magnetic drills can be placed in all of the following positions except _____ when drilling

v-blocks

since drilling in the curved surface of round stock is more difficult it is advisable to use ______ to hold the round material in a vise or clamp directly to the table

drill press

the _____ is the most common drilling machine

jobber's

the ______ is almost identical to the hand reamer except that the shank has been designed for machine use

drill point gage

the ______ should be used frequently when sharpening to ensure a correctly sharpened drill

2/3

the cutting speed for HSS reamer is approximately ______ that for a similar sized drill

socket

the device used to permit a drill with a taper shank too large to fit the spindle opening is called ______

118

the included angle of a drill point sharpened for general drilling is ______ degree

counterbore

the operation used to prepare a hole for a fillister or socket head screw is called ______

web

the part of the body of a drill that separates the flutes is the ______

largest diameter circular piece that can be drilled on center

the size of the drill press is determined by the ______

help form the cutting edge of the drill point, curl chips for easier removal, form channels through which the chips can escape *******

the spiral grooves in a drill body are used to ______

flutes

the spiral grooves that run the length of the drill body are called ______

does not cross

the spiral shape of the drill flute ______ (causes/does not cause) the drill to pull itself into the work

none

what coolant should be used when drilling cast iron

tapered spindle

what device is used to enlarge a taper shank drill so it will fit a spindle opening

the drill will scape and cause chattering which will dull the blade

what happens to the drill if the feed rate is set too low

a hole not drilled all the way through the work

what is a blind hole

countersinking

what is the name of the operation used to cut a chamfer in a hole to receive a flat head screw

drill drift

what is the name of the tool used to separate a taper shank drill from a drill holding device

to remove taper shank tools from the drill spindle

what is the purpose of a drill drift

when the drill is too small for the spindle

what is the purpose of a drill sleeve

when the spindle is too small for the drill

what is the purpose of a drill socket

oversized holes are created

what occurs when the cutting lips of a drill are not sharpened to the same lengths

the tap will shatter when power is applied

what would happen if you tried to use drill press power to run a tap into the workpiece

drilling margins

when a micrometer is used to measure drills, the measurement is made across the ______ unless the drill is worn

dead center******

when drilling a pilot hole, the hole should be as large as, or slightly larger than , the width of the ______ of the drill point

use the largest t-bolts that will fit on the table

when setting work up on a drill press table, you should do all of the following tasks except ______

u-strap

when the work holding device must bridge the work a(n) ______ clamp should be used because it can straddle the drill and will not interfere with the drilling operation

to permit a flat headed fastener to be inserted with the head flush to the surface

why is a hole countersunk

the provide a bearing surface for a bolt, nut, or washer

why is a hole spotfaced