23 Jun What are the speed and feed values of these drills and taps? Clearly state your cutting speed data along with the references, and the appropriate units. (4)
What are the speed and feed values of these drills and taps? Clearly state your cutting speed data
along with the references, and the appropriate units. (4)
List three typical tap types, and when they are used (1.5).
Reaming: For an 8F7 hole: (5)
What is the diameter of your drill you would use? ______________.
What reamer would you use and why? ______________.
Drill Reamer
Material
Feeds
Speeds
Time
Other characteristics:
06-91-321-01 Fall 2015
University of Windsor
Manufacturing Process Design
Instructors:
Dr. Jill Urbanic, e-mail: jurbanic@uwindsor.ca
3 of 5
Quickies (3)
Which of the following statements is not correct?
a) core drills have 3 or 4 flutes.
b) high helix drills help in chip removal.
c) straight fluted drills are used for sheet metal.
d) centre drills are for long holes, such as gun barrels.
If we want a hole with a 1/2-13-UNC thread, what size of tap drill should be used? (1)
If we want a hole with a 6 x 1.0 thread, what size of tap drill should be used? (1/2)
What size is an F drill? (1/2)
List three reasons that machining operations may be required, and provide an example for each. Do
not provide duplicate information. (3)
What special precautions are needed when cutting magnesium, and thermoplastic materials (such as
ABS plastic)? (3)
When considering the basic metal-cutting process, what are the important physical and chemical
properties of a cutting tool? (2)
Tool materials can have conflicting properties when used for machining operations. Discuss. Use
numerical examples to justify your answer, and reference appropriately. (Hint: consider tool costs, tool
life, processing time, potential failure modes). (8)
Explain whether it is desirable to have a high or low (a) n value and (b) C value in the Taylor tool-life
equation. You may develop an example to assist with your explanation. (2)
Describe the difficulties that may be encountered in clamping a workpiece made of a soft metal in a
three-jaw chuck or a vise. (1)
It has been stated that titanium-nitride coatings allow cutting speeds and feeds to be higher than
those for uncoated tools. Survey the technical literature and prepare a table showing the percentage
increase of speeds and feeds that would be made possible by coating the tools. (4)
List the concerns you would have if you needed to economically machine carbon-fiber reinforced
polymers or metal-matrix composites with graphite fibers in an aluminum matrix. (5)
Contact several different suppliers of cutting tools, or search their websites. Make a list of the costs of
typical cutting tools as a function of various sizes, shapes, and features. (5)
06-91-321-01 Fall 2015
University of Windsor
Manufacturing Process Design
Instructors:
Dr. Jill Urbanic, e-mail: jurbanic@uwindsor.ca
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