General Maths

Question 1

Imperial conversions?

Answer 1

1 st - 14 lb
1 lb = 16 oz
1 yd=  3ft
1 ft = 12 in
1 UK gal = 8 UK pt

Question 2

Imperial to Metric Conversions?

Answer 2

1 in = 25.4 mm
1 ft2 = 0.0929 m2
1 litre = 1.76 UK pt
1 oz = 28.35 g

Question 3

Volume of sphere?

Answer 3

V = 4/3 x pi x r3

Question 4

Probability formula?

Answer 4

P = no. of wanted outcomes / no. of possible outcomes

Question 5

What is cutting speed?

Answer 5

The speed (velocity, V) between the cutting tool and the surface of the workpiece (m/min), expressed in units of distance moved around the circumference of a workpiece surface per unit of time

Question 6

What is spindle speed?

Answer 6

Expressed in terms of number of revolutions of the machine’s spindle (RPM) for lathes (S)

Question 7

Equation between cutting and spindle speed?

Answer 7

V (cutting) = (pi x diameter x S) / 1000 m/min

Question 8

What is feed rate?

Answer 8

The rate at which the cutting tool moves along the workpiece (F)

Question 9

Equation for feed rate?

Answer 9

F (feed, mm/min) = f (feed, mm/rev) x S (RPM)

Question 10

Aluminium surface cutting speed?

Answer 10

80 - 150 m/min

Question 11

Brass surface cutting speed?

Answer 11

40 - 80 m/min

Question 12

Cast iron surface cutting speed?

Answer 12

15 - 30 m/min

Question 13

Aluminium linear feed rate?

Answer 13

0.2 - 100 mm/rev

Question 14

Brass linear feed rate?

Answer 14

0.2 - 100 min/rev

Question 15

Cast iron linear feed rate?

Answer 15

0.15 - 0.7 min/rev

Question 16

Similar triangles equation?

Answer 16

a/angleA = b/angleB = c/angleC

Question 17

Factors affecting cutting speeds?

Answer 17

The material being machined
The cutter material
The economic life of the cutter

Question 18

Cutting speeds calculated based on optimum cutting conditions exist, including?

Answer 18

Metal removal rate
Full and constant flow of cutting fluid
Rigidity of machine and tooling setup
Continuity of cut
Condition of material

Question 19

Factors affecting feed rate?

Answer 19

Strength of workpiece (high rate collapses tin wall tube)

Characteristics of the material cutter