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DML UF 2017PRINCIPLES [222q&a] FINAL EXAM
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DML UF 2017PRINCIPLES [222q&a] FINAL EXAM
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DML UF 2017PRINCIPLES [222q&a]FINAL EXAM
Which of the following is not a common component of the engine lathe?
A. Headstock
B. cross slide
C. tool post
D. tailstock
E. ram - ✔✔ANSW✔✔..E. Ram
Six factors that affect optimum cutting speed for drilling and milling - ✔✔ANSW✔✔..1.
Strength and thermal conductivity of a material
2. Depth of hole
3. Presence and efficiency of cutting fluid
4. Type, condition and stiffness of cutting machine
5. Stiffness of workpiece, fixture and tooling
6. Quality of holes desired
Which conditions would you use lower cutting speeds:
1. Heavy roughing/light (finishing) cuts
2. When cutting stronger/weaker materials
3. to minimize/maximize tool life
4. when cutting flexible/rigid workpieces - ✔✔ANSW✔✔..1. Heavy roughing
2. Stronger
3. Maximize
4. Flexible
Use screw/bolt holes - ✔✔ANSW✔✔..Bolt
Design parts to use cutting tools with larger/smaller L:D ratios - ✔✔ANSW✔✔..Smaller
Design parts with/without chamfers and fillets - ✔✔ANSW✔✔..Without
Use clearance/line fits for fasteners holes - ✔✔ANSW✔✔..Clearance
Always/never design parts that can be purchased off the shelf - ✔✔ANSW✔✔..Never
,Specify slots or pockets with round/square corners when using traditional manufacturing
equipment. - ✔✔ANSW✔✔..Round
Consider/ignore room for assembly tools - ✔✔ANSW✔✔..Consider
Always place fastener threads in shear/tension - ✔✔ANSW✔✔..Tension
Use fasteners/pins for locating parts with respect to each other - ✔✔ANSW✔✔..Pins
Specify (8) 1/4-20 UNC threads in aluminum/ (8) 1/4-28 UNF threads in steel/ either -
✔✔ANSW✔✔..(8) 1/4-20 UNC threads in aluminum
Specify (8) 1/4-28 UNF threads in steel/ (8) 1/4-28 UNF threads in titanium/ either -
✔✔ANSW✔✔..(8) 1/4-28 UNF threads in steel
Specify (8) 1/4-20 UNC threads in aluminum/ (8) 4-40 UNC threads in aluminum/ either
- ✔✔ANSW✔✔..(8) 1/4-20 UNC threads in aluminum
Specify (8) 1/4-28 UNF threads in steel/ (8) 2-64 UNF threads in steel/ either -
✔✔ANSW✔✔..(8) 1/4-28 UNF threads in stee
Specify (8) 1/4-20 threads in aluminum/ M6x1.0 threads in aluminum/ either -
✔✔ANSW✔✔..Either
Specify (8) 1/4-20 UNC threads in aluminum/ (8) 1/2-13 UNC threads in aluminum/
either - ✔✔ANSW✔✔..(8) 1/4-20 UNC threads in aluminum
What is a waterjet used for? - ✔✔ANSW✔✔..2D CNC cutting of SOFT materials
What is an Abrasive Water Jet (AWJ) used for? - ✔✔ANSW✔✔..2D CNC cutting of
almost any material, regardless of HARDNESS
List 7 advantages of the AWJ process - ✔✔ANSW✔✔..1. Virtually ANY material can be
cut
2. quality, SATIN-LIKE finish
3. no HEAT in the machining process
4. Environmentally RESPONSIBLE
5. no TOOL changing
6. Produces minimal BURRS
7. Virtually any 2D shape can be cut
List 3 disadvantages of the AWJ process - ✔✔ANSW✔✔..1. Machines are expensive
(125k -300k)
2. Machines require frequent maintenance
, 3. Machines are pretty messy due to the water blowing backwards during piercing
Modern AWJ machines generate water cutting pressures of 800 psi and cutting jet
velocities approaching 200 mph (True or False) - ✔✔ANSW✔✔..False, idk correction
AWJ machines can cut at different speeds depending on the desired cut quality (True or
False) - ✔✔ANSW✔✔..True
Four reasons aluminum is a popular material choice - ✔✔ANSW✔✔..1. Relatively
CHEAP
2. Relatively low DENSITY
3. Relatively STRONG
4. Possesses a high MANUFACTURABILITY
L:D Ratio ____________ for milling, _____________ for drilling - ✔✔ANSW✔✔..Lest
than 2:1 for milling, Less than 8:1 for drilling
Define what is meant by the phrase Design For Manufacturability (DFM) -
✔✔ANSW✔✔..Consciously trying to design parts that can be manufactured for the
lowest COST while meeting the required DESIGN intent and SERVICE factors.
Free hand flame/Plasma cutting tolerance - ✔✔ANSW✔✔..50 to 100 T
Free hand grinding tolerance - ✔✔ANSW✔✔..20 to 50 T
What rotates on a lathe? - ✔✔ANSW✔✔..The chuck and the workpiece/material
What is Turning? - ✔✔ANSW✔✔..A metal cutting process used mainly for the
generation of cylindrical surfaces parallel to the workpiece axis
What are 3 common workholding methods on a lathe? - ✔✔ANSW✔✔..Holding in a
chuck, Holding between centers, and Holding in a collet
Where should the tool bit be positioned while operating on a lathe? -
✔✔ANSW✔✔..Directly on the spindle center line
Three most important items you need to bring to lab every week - ✔✔ANSW✔✔..1.
Safety Sheets
2. Proper Shoes
3. Long Pants
What rotates on a milling machine? - ✔✔ANSW✔✔..The cutting tool and the spindle
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