Drilling

Question 1

type of drill press for precise work up to 1/2”, has no power feed and driven by a v-belt

Answer 1

sensitive drill press

Question 2

drill press with power feed and for drilling holes from 1/2”-4”

Answer 2

upright drill press

Question 3

electric hand drills are capable of drilling holes up to

Answer 3

1/2” in diameter

Question 4

larger hand drills are sized by the chuck from

Answer 4

1/2-3/4

Question 5

what are 2 ways to size a drill press

Answer 5

largest diameter a workpiece can be centered

distance from column to tool

Question 6

difference of a drill sleeve and drill socket

Answer 6

sleeves increase diameter of a taper

sockets reduce taper

Question 7

difference between drill jig and fixtures

Answer 7

fixtures hold and jigs guide tool

Question 8

drill bit angle for general purpose

Answer 8

118

Question 9

drill bit angle for soft material

Answer 9

60-90

Question 10

drill bit angle for hard material

Answer 10

150

Question 11

drilling too fast will

Answer 11

premature tool wear

Question 12

drilling too slow will

Answer 12

break tool

Question 13

cause of drill chatter

Answer 13

pilot hole too large

Question 14

cause of bell mouth hole

Answer 14

cutting lips uneven length

point angle uneven

Question 15

the diameter of a drill is measured across the

Answer 15

margins

Question 16

lip clearance is achieved by

Answer 16

grinding the heel lower than the cutting edge

Question 17

drill 35-40 degrees used for deep holes in soft material, like aluminum, copper, and zinc as these materials jam flutes in normal drill

Answer 17

high helix drills

Question 18

drill used to enlarge existing holes, have 3 or 4 flutes and cannot cut their centre

Answer 18

core drills

Question 19

drill having one or two holes that run the length of the drill and exit behind the cutting edge

Answer 19

oil hole drills

Question 20

drill used in soft material such as brass, bronze and plastics

Answer 20

straight flute drills

Question 21

most countersink have an angle of

Answer 21

82 degrees

Question 22

spiral flute taps push chips

Answer 22

up out of the hole

Question 23

spiral point (gun) tap push chips

Answer 23

down out of the hole

Question 24

straight fluted tap chips

Answer 24

jam holes

Question 25

feed rate is measured in

Answer 25

inches or millimeters per revolution

ipr

Question 26

the clearance angle for cutting edge for general purpose work is

Answer 26

8 to 12 degrees

Question 27

what tool is used to removed a morse taper from a drill

Answer 27

drill drift

Question 28

reamed holes over 1/2 need to be drilled

Answer 28

1/32 smaller

Question 29

reamed holes up to 1/2 need to be drilled

Answer 29

1/64 smaller

Question 30

pilot holes should be sized

Answer 30

to the web of the drill to be used or slightly larger

Question 31

what is the rule for speed and feed

Answer 31

Half the speed twice the feed

Question 32

drill with movable arm able to be positioned within a certain radius with arm capable of moving up and down along column

Answer 32

radial arm drill