Drilling

Question 1

what is drilling

Answer 1

creates a hole in the material

Question 2

whats the difference between drilling and boring

Answer 2

drilling creates, boring enlarges

Question 3

what are the 2 difderent types of holes/definitions

Answer 3

through hole- exits the oppisite side
blind holes-doesnt exit the oppisite side

Question 4

difficulties in drilling

Answer 4

difficult to cut hole on size
poor finish inside the hole
drills want to walk arcross material
can leave big burrs
as hole get deeper harder to keep centred

Question 5

what is special about a upright drill press

Answer 5

belt drive
had high speed and low torque

Question 6

what is special about a gear head drill press

Answer 6

more powerful
slower speed for bigger drills
powerful quill feed

Question 7

what is a radial arm drill

Answer 7

designed for large holes
has and arm that canmove up/down/rotate about colum
head can move in and out along with the arm
parts are mounted to base

Question 8

what are the 3 ways a drill press can hold a part/discriptions

Answer 8

vice-holds part between opisite jaws
fixture-customed designed for particular work peice
drill jig- similar to fixture but also guides the tool along

Question 9

what is reaming

Answer 9

enlargning holes with a better accuracy and finish of the walls
a finishing operation

Question 10

what is the purpose of reaming

Answer 10

slightly enlarge the hole
proides better tolerance
improve surface finish

Question 11

what are 5 different types of reamers

Answer 11

hand reamers
machine reamers
morse taper reamer
tapered reamer
expandable reamer

Question 12

what is tapping

Answer 12

cutting or forming a thread
only allowed to exsisting hole

Question 13

what are the 3 main tap styles

Answer 13

straight flute
spiral point tap
spiral flute tap

Question 14

what is a straight flute for

Answer 14

mainly for hand tapping, can e used for machine tapping

Question 15

what is a sprial point tap for

Answer 15

pushes chip ahead of tap
good for through holes

Question 16

what is a spiral flute tap for

Answer 16

good for deep blind holes
draws chips out of the hole

Question 17

what is a tap lead in

Answer 17

end of standard tap is chamfered
helps align the tap to the hole

Question 18

what are the 3 types of taps/ how many ttapered threads

Answer 18

plug tap-3-5 threads
taper tap- 7-10 threads
bottom tap- 1-2 threads

Question 19

what is the purpose of the 3 types of taps

Answer 19

taper tap- used for threading through material ,first threads in a blind hole
plug tap- used for near the bottom of a blind hole
bottom tap- used for threading the bottom of a blind hole

Question 20

what are form taps

Answer 20

no chips produced
deforms peice instead of cutting it
doesnt work on all materials
yight tolerance on the drillled hole

Question 21

what are threading dies

Answer 21

can be used to vreate external threads on a rod
suited for reparing and cleaning up threads then creating them

Question 22

what is centre drill

Answer 22

used for drilling a hole between centres

Question 23

what is spot drilling

Answer 23

used for precise hole placement
creates a shallow pilot hole

Question 24

what is counterboring/what is it used for

Answer 24

provides a steep hole
used when the gead of faster has to be flush

Question 25

what is counterinking

Answer 25

a conical hole is created

Question 26

what is spot facing

Answer 26

a shallow couter bore
used to create flat landing surface