PDF 10

Question 1

Fill the blanks.

1.____ tool life for the given work material
means better machinability
2.____ forces and power mean
better machinability

Answer 1

1. longer

2. lower

Question 2

▪ MR of test material > 1.00 (100%) means _____

Answer 2

better machinability

Question 3

▪ Closer tolerances usually mean ____ costs

Answer 3

higher

Question 4

Surface roughness in machining is determined by

1. ?
2. ?
3. ?

Answer 4

1. Geometric factors of the operation
2. Work material factors
3. Vibration and machine tool factors

Question 5

Cutting conditions: depth of cut, feed, speed, and 
cutting fluid:
1.
2.
3.
4.

Answer 5

depth of cut, feed, speed, and

cutting fluid

Question 6

*In roughing, depth is made as ____ as
possible to maximize material removal rate.
* In finishing, depth is set to achieve final part
dimensions and surface finish

Answer 6

large

Question 7

Determining feed rate depends on:

Answer 7

• tooling

- roughing or finishin

Question 8

Maximum Production Rate (MPR)

Answer 8

Tc = Th + Tm + Tt/np

1. Part handling time per part = Th
2. Machining time per part = Tm
3. Tool change time per part = Tt
   /np
   , where np =
   number of pieces cut in one tool life

Question 9

Minimizing Unit Cost

Answer 9

Cc = CoTh + CoTm + CoTt/np + Ct/np

Question 10

Reasons why machining may be required:

Answer 10

▪ Close tolerances
▪ Good surface finish
▪ Special geometric features:
-Threads
- Accurate holes
- Accurate cylindrical sections
- Flat and/or straight surfaces