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MEC-44 Quiz 3

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1: When putting away a micrometer or vernier caliper you should

carefully zero the scale
open the jaws a few mils
put it in the case upside down
set the scale to the metric reading

2: The United States defines the inch as

3 english barleycorns
one twelfth of a foot
2.54 centimeters
5284.7 Angstroms

3: The 90° cutout located at 1.00 x 1.25 on the gazornenplap bracket is cut out using a tool called a

notching tool
nibble tool
bending brake
corner shear

4: When referring to bolts/screws, "pan" is a type of

head
thread
nut
shank

5: When measuring shoulder bolts, "length" is measured from

the top of the head to the end of the shoulder
bottom of the head to bottom of the shoulder
top of the head to bottom of the thread
bottom of the head to bottom of the thread

6: A bolt with three radial lines on top is a

Grade 3 medium strength bolt
Grade 3 high strength bolt
Grade 8 high strength bolt
Grade 5 medium strength bolt

7: The grade of Loctite that is SEMI-permanent is

#242, red
#271, red
#242, blue
#271, blue

8: According to "Audel" (and almost all other references) the TAP hole size for an 8-32 screw is

#36 (0.1065)
#29 (0.136 dia)
#29 (0.166 dia)
#25 (0.1495)

9: The tap hole in question #8 will give what % of full thread

25
50
75
100

10: According to both the lesson and "Audel" the drill for the Schrader valve (1/8-27 NPT taper) is a

Letter "R"
7 mm metric
Letter "U"
1/8 inch dia

11: The Scrader valve was installed using

pliers
an impact wrench
blue Loctite
teflon tape

12: On the robot arm project, what are the two versions called?

basic and advanced
SMC cylinder and syringe
pneumatic and electric
hydraulic and pneumatic

13: As regards the parts to be manufactured for these two versions

they are totally different parts in the two versions
there are about the same number of similar and different parts for the two versions
most of them are the same for both versions
they are all the same parts for the two versions

14: The Fixed Jaw, Moving Jaw, and Side Supports are all part of the

arm
base
drive
electronics

15: Almost all the metal parts used in this robot arm project are made from

mild steel, 1020
chrome-moly steel, 4130
aluminum, 5052H32
aluminum, 6061-T6

16: One precaution about drilling the Main Gear is that

the center hole must be precisely located
the polycarbonate is brittle
the fumes from drilling are toxic
it should not discolor the plastic

17: The basic command "chamfer" really means to

countersink a hole
ream the hole to a precise size
plate the hole to the desired diameter
miter the surface (top and or bottom) diameter of a hole

18: The "shim" for the pinion gear to stepper motor is

extremely expensive and given out a little bit at a time
made from standard brass shim stock
made from a beverage can
available from a metals supply company

19: The rotation shaft is made from

carbon steel tubing
aluminum rod
cold rolled steel rod
brass tubing

20: In drafting the term "isometric" may be referred to as

precision
top, side, front
photograph
3-D

21: The "Drawing Log" for the robot arm project

contains a few of the drawings used to fabricate the arm assembly
is itself a drawing
never needs modifications from the original
need not be kept up to date with the latest revisions

22: The center hole for the Arm-Pivot Plate may

not be all the way through the part
be done with either a #12 drill or a 3/16 punch
must be done with a reamer
should be done after all bends are made

23: The rounded edges on the Pneumatic Regulator Bracket

can be done with a shear, nibbling tool, file
must be done on the mill
can be done with a drill press
can be done on the wheel grinder

24: The base block bearing

center hole diameter is relatively non-critical
is chamfered on one edge only
needs two parts per assembly
is made from brass tubing

25: Of the arm and base pins

all four are required for both versions
only two are required for either version
three out of the four are required for each of the two versions
are no longer required due to a modification

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