Deck 9: Machining and Finishing

Question 1

Induced fracture methods for cutting plastics are similar to those for cutting ____. 

A) glass
B) wood
C) aluminum
D) carbide

Answer 1

A

Question 2

When machining plastics, it is best to use cutting tools usually used for machining brass and ____.    

A) carbide
B) aluminum
C) steel
D) wood

Answer 2

B

Question 3

Thicker plastics (over 6 mm) require ____ teeth per centimeter when cutting (sawing). 

A) greater than 12
B) at least 45
C) more
D) fewer

Answer 3

D

Question 4

Solvent-dip polishing of cellulosic and ____ plastics may be used to dissolve minor surface defects.

A) acrylic
B) laminate
C) thermosetting
D) epoxy

Question 5

A milling operation in which the work moves in the same direction as the rotating cutter is____ milling. 

A) coarse
B) sequential
C) climb
D) spindle

Question 6

A ____ bandsaw blade features a wide gullet, which provides ample space for plastics chips to be carried out of the kerf.  

A) straight tooth
B) standard tooth
C) skip tooth
D) hooked tooth

Question 7

The milling operation shown here is known as ____.  

A) laser cutting
B) thermal cutting
C) climb milling
D) induced fracture cutting

Question 8

Laser power can be controlled to merely ____ the plastics surface or actually vaporize and melt it.

A) thread
B) machine
C) drill
D) etch

Question 9

For some plastics and composites, the internal stresses of production may be reduced or eliminated by____, which consists of prolonged heating of the plastics part at a temperature lower than the molding temperature.

A) burnishing
B) milling
C) annealing
D) flame polishing

Question 10

The rake on the bit for drilling polyethylene should be ____ degrees. 

A) 0
B) 45
C) 90
D) 120

Question 11

Abrasive grinding is more easily accomplished on ____ materials.

A) thermoplastic
B) foamed
C) thermosetting
D) laminate

Question 12

Which drilling operation is shown below?   

A) spotfacing
B) counterboring
C) countersinking
D) reaming

Question 13

Polishing plastics (burnishing) uses ____ compounds to produce a polished surface.

A) pumice
B) grit
C) sand
D) wax

Question 14

The punching and shearing of laminar composite materials usually results in ____.

A) clogging
B) splitting
C) delamination
D) gumming

Question 15

Which machining task would be done on abrasive-charged wheels?     

A) tapping
B) drilling
C) cutting
D) buffing

Question 16

The rake on this circular saw blade is ____. 

A) centered
B) negative
C) positive
D) zero

Question 17

The milling operation shown here is known as ____.  

A) laser cutting
B) thermal cutting
C) climb milling
D) induced fracture cutting

Question 18

Flame polishing is used to finish the edges of thermoformed or fabricated ___ products.  

A) epoxy
B) ----acrylic
C) laminate
D) styrene

Question 19

Machining techniques for composite materials, such as high-pressure laminates, involve backing up the work with a solid material to reduce____.    

A) laser cutting
B) prevention of fraying
C) control of fine dust
D) prevention of burning

Question 20

In a tumbling-barrel process, the smoothing agent is a(n) ____ and a lubricant.

A) abrasive
B) wax
C) epoxy
D) ash