Degarmo's Materials And Processes In Manufacturing
13th Edition
ISBN: 9781119492825
Author: Black, J. Temple, Kohser, Ronald A., Author.
Publisher: Wiley,
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Textbook Question
Chapter 24, Problem 8P
In Figure 24.12, the feed is 0.006 in. per tooth. The cutter is rotating at an rpm that will produce the desired surface cutting speed of 125 sfpm. The cutter diameter is 3 in. The depth of cut is 0.5 in. The block is 2 in. wide.
- What is the feed rate, in inches per minute, of the milling machine table?
- What is the MRR for this situation?
- What is horsepower (HP) consumed by this process, assuming an 80% efficiency and a HPs value for this material of 1.8?
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1. In Figure 1, the feed is 0.006 in. per tooth. The cutter is rotating at
an rpm that will produce the desired surface cutting speed of 125
fpm. The cutter diameter is 3 in. The depth of cut is 0.15 in and
width of the cut is 2 in. The block is 5 in. wide and 12in long.
Determine
a. The feed, in inches per minute.
b. Approach distance for this type of milling
c. Cutting time to make one pass across the surface
d. If an additional approach distance of 0.5 in is provided
at the beginning of pass and an over travel distance is
provided at the end of pass equal to the cutter radius
plus 0.5 in, what is the duration of the feed motion?
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Figure: 01
Turning Operation
In a production turning operation, the foreman has decreed that
a single pass must be completed on the cylindrical workpiece in
4.8 min. The piece is 400 mm long and 150 mm in diameter.
Using a feed = 0.43 mm/rev and a depth of cut = 4.0 mm, what
cutting speed must be used to meet this machining time
requirement?
Hint: Re-arrange the Tm equation to find v in m/min
Tm=
T.DO.L
v.f
1.522
A two-spindle drill cuts two holes at the same time, one 1/2 inch and one 3/4 inch. The workpiece is 1.0 inches thick. Both drills have point angles of 118 degrees and the cutting speed for the material is 300 ft/min. The rotational speed of each drill can be set individually but the feed rate for both holes must be set to the same value because they move together into the material. The feed rate is set so that the total metal removal rate of both drills combined does not exceed 1.50 in3/min. Determine (a) maximum feed rate (in/min) that can be used, (b) individual feeds (in/rev) for each hole, and (c) cutting time for the operation.
Chapter 24 Solutions
Degarmo's Materials And Processes In Manufacturing
Ch. 24 - Suppose that you wanted to machine cast iron with...Ch. 24 - How is the feed per tooth related to the feed rate...Ch. 24 - Why must the number of teeth on the cutter be...Ch. 24 - Why is the question of up or down milling more...Ch. 24 - For producing flat surfaces in mass-production...Ch. 24 - Milling has a higher metal removal rate than...Ch. 24 - Which type of milling (up or down) is being done...Ch. 24 - Why does down milling dull the cutter more rapidly...Ch. 24 - What parameters do you need to specify in order to...Ch. 24 - In Figure 24.2b, the tool material is carbide....
Ch. 24 - What is the advantage of a helical-tooth cutter...Ch. 24 - What would the cutting force diagram for Fc look...Ch. 24 - Could the stub arbor-mounted face mill shown in...Ch. 24 - In a typical solid arbor milling cutter shown in...Ch. 24 - Make some sketches to show how you would you set...Ch. 24 - Make some sketches to show how you would set up a...Ch. 24 - Explain how controlled movements of the work m...Ch. 24 - Prob. 18RQCh. 24 - What is the purpose of the hole-circle plate on a...Ch. 24 - You have selected a feed per tooth and a cutting...Ch. 24 - How much time will be required for a milling...Ch. 24 - If the depth of cut is 0.35 in., what is the metal...Ch. 24 - Prob. 4PCh. 24 - Calculate the spindle rpm and table feed (ipm) for...Ch. 24 - A gray cast iron surface 6 in. wide and 18 in....Ch. 24 - Prob. 7PCh. 24 - In Figure 24.12, the feed is 0.006 in. per tooth....Ch. 24 - Suppose you want to do the job described in...Ch. 24 - The Bridgeport vertical-spindle milling machine is...Ch. 24 - The KC Machine Works, which does job shop...
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