Cutting Bits

Question 1

What does heat do to a bit

Answer 1

makes them to hot to hold

affects the heat treatment of the bit (cutting edge becomes soft)

Question 2

What should you do to prevent this

Answer 2

Keep a cup of water nearby and dip your bit in it frequently.

Question 3

Side cutting edge

Answer 3

does majority of the cutting.

Question 4

Front cutting edge

Answer 4

Cuts when tool is advanced into the part

Question 5

Nose radius

Answer 5

critical part for cutting edge, produces the surface finish

Question 6

side rake

Answer 6

produces side cutting edge

Question 7

side relief

Answer 7

provides your clearance for the side cutting edge. Without the relief the side cutting edge would hit the piece and not penetrate it.

Question 8

back rake

Answer 8

Produces the front cutting edge

Question 9

Angle for side relief

Answer 9

10*

Question 10

Angle for Back and side rake

Answer 10

about 12* for side and 8* for back rake

Question 11

Angle for front relief

Answer 11

8-10*

Question 12

Nose radius types

Answer 12

small radius allows for tight corners

large radius produces better finish.

Question 13

what is cutting speed

Answer 13

the distance the work moves past the work

Question 14

feed

Answer 14

distance the cutter moves lengthwise during a single revolution.
using coolant allows the increase of feed by 50% and by 300-% by carbide cutters.

Question 15

front relief

Answer 15

produces the front cutting edge

Question 16

When and how was carbide discovered

Answer 16

In 1893 when trying to make artificial diamonds

Question 17

Advantages of using carbide bits

Answer 17

better surface finish
faster machining
cuts tougher metal such as carbon and stainless
longer working life
can run 8x's faster than HSS
no need for duplicate tools

Question 18

Disadvantages of Carbide bits

Answer 18

more expensive
not easily shaped or sharpened
not as tough as HSS
more brittle than HSS

Question 19

Common uses for carbide

Answer 19

lathe bits for turning
used in milling machines
saw blades
drill bits