drilling

Question 1

what are sensitive drill presses used for

Answer 1

small, precise work (hole up to 1/2)

Question 2

What drives a spindle on a sensitive drill press

Answer 2

V-belt

Question 3

5 types of drilling machines

Answer 3

Sensitive drill press
Upright drill press
Hand drills
Magnetic base drill
Radial drilling machine

Question 4

What is an upright drill press used for

Answer 4

Larger holes (1/2 to 4 inch)

Question 5

What is a magnetic base drill

Answer 5

Heavy portable drill and secures to the workpiece by electro magic base

Question 6

What is a radial drilling machine used for

Answer 6

Drill holes in very large workpieces

Question 7

What would your rpm be if your diameter is 2” and you have 50 sfpm

Answer 7

100 rpm

Question 8

What would your rpm be if your diameter is 2” and you have 50 sfpm

Answer 8

100 rpm

Question 9

Two methods of manual feed on a radial arm drill press

Answer 9

Hand feed lever
Hand wheel

Question 10

Two ways of sizing a sensitive or upright drill press

Answer 10

The distance from the centre of the spindle to the column
Largest diameter of workpiece that can be centred under the spindle

Question 11

Radial arm drilling machines typically range in size from

Answer 11

3 to 14ft with a column diameter of 30 inches and more

Question 12

Drill chucks are sized according to what

Answer 12

Largest drill they can hold

Question 13

shank of drills when they are larger then 1/2 inch have what

Answer 13

Tapered

Question 14

Morse tapers are separated how

Answer 14

With a drift

Question 15

What do you use when sequence of operations must be done repeatedly

Answer 15

Quick change tool holder

Question 16

What does a drill jig (holding device) do

Answer 16

Locates a hole accurately on a workpiece

Question 17

What are the 3 parts to a twist drill

Answer 17

Point
Body
Shank

Question 18

Two types of shanks

Answer 18

Straight
Taper

Question 19

You have a drill diameter of 0.75” and a sfpm of 120, what is the rpm

Answer 19

640 rpm

Question 20

Straight shank are used on drills up to

Answer 20

1/2 inch diameter

Question 21

Taper shanks have a standard taper of what

Answer 21

5/8 inch per foot

Question 22

What has two helical flutes

Answer 22

Twist drill

Question 23

What is the margin

Answer 23

Narrow raised section that runs along the flutes for their entire length

Question 24

The geometry of a point on a drill bit are defined by what

Answer 24

Cutting lips
Chisel edge
Lip clearance

Question 25

9 specialty drills

Answer 25

High helix drill Core drills Oil hole drills Straight fluted drills Twist drills Step drills Saw type hole cutter(hole saw) Masonry drill Centre drill

Question 26

Centre punch mark should be at least what size

Answer 26

As large as the chisel edge of the drill bit

Question 27

What is the most common drill bit angle

Answer 27

118 degrees

Question 28

150 degree drill bit angle is meant for cutting what

Answer 28

Hard materials

Question 29

90 degree drill bit angle is meant for cutting what

Answer 29

Soft materials

Question 30

What bigger the drill bit the more what

Answer 30

Feed pressure needed

Question 31

3 methods used for hole location transfer

Answer 31

Twist drill method Transfer punch method Transfer screw method

Question 32

Most common countersink angle

Answer 32

82 degrees (most screws have an included angle of 82 degrees)

Question 33

What is counterboring

Answer 33

Enlarging the top of an existing hole

Question 34

What size is the pilot guide for the counterbore

Answer 34

0.002 and 0.005 of an inch smaller than the hole diameter

Question 35

How is cutting speed measured

Answer 35

Metres per minute (m/min) or Sfpm

Question 36

What is the fastest moving part of a rotating part such as a drill bit

Answer 36

Outside edge also often called peripheral speed

Question 37

Four major parts of a drill press

Answer 37

Head Column Table Base