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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Chapter 24, Problem 5RQ
For producing flat surfaces in mass-production machining, how does face milling basically differ from peripheral milling?
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What are the parts of a vertical milling and its uses?
Consider a profile milling operation, where the
initial (stock) geometry has (X,Y,Z) dimensions of
100 mm x 75 mm x 50 mm. The target part has
dimensions of 95 mm x 70 mm x 50 mm. The
target part is located in the centre of the stock
part, i.e. the stock to be removed from all sides is
equal. The operation has a cutting time of 1
minute. The tool axis is along the Z direction and
the tool diameter is 12 mm having 6 cutting
edges. The takes place at 54m/min
feed rate of 0.2 mm/rev/tooth.
Calculate the axial depth of cut ?
process
at a
Problem 2. (Determining Cutting Speeds in Machining Economics)
A turning operation is performed with HSS tooling on mild steel, with Taylor tool life parameters n = 0.12, C = 60 m/min. Work part length = 450 mm and diameter = 80 mm. Feed = 0.20 mm/rev. Handling time per piece = 4.0 min, and tool change time = 1.5 min. Cost of
machine and operator = $27/hr, and tooling cost = $2 per cutting edge. Find the
a. cutting speed for maximum production rate = 44.997m/min.
b. cutting speed for minimum cost = 38.143m/min.
Problem 3. (Production Rate and Cost in Machining Economics)
For the two cutting speeds computed in problem 2, determine:
a. the hourly production rate and
b. the cost per piece.
Need help with problem 3 already done problem 2
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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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Similar questions
- What are the different types of milling and its uses?arrow_forwardVertical Milling Image and indicate its parts and its uses.arrow_forwardProblem 2. (Determining Cutting Speeds in Machining Economics) A turning operation is performed with HSS tooling on mild steel, with Taylor tool life parameters n = 0.12, C = 60 m/min. Work part length = 450 mm and diameter = 80 mm. Feed = 0.20 mm/rev. Handling time per piece = 4.0 min, and tool change time = 1.5 min. Cost of machine and operator = $27/hr, and tooling cost = $2 per cutting edge. Find the a. cutting speed for maximum production rate and b. cutting speed for minimum cost Problem 3. (Production Rate and Cost in Machining Economics) For the two cutting speeds computed in problem 2, determine: the hourly production rate and a. b. the cost per piece.arrow_forward
- What are the advanced strategies and technologies used in optimizing the precision, speed, and tool life of Vertical Machining Centers (VMCs) in modern manufacturing processes, and how do these advancements contribute to increased productivity and reduced production costs?arrow_forwardThe following data is given for slab milling of a 300 mm long 50 mm wide mild steel block: Cutter of diameter= 60 mm; Numbers of teeth =12; Cutter speed = 120 rev/min; Depth of cut = 3.2 mm; Feed is 0.25 mm/tooth.Determine (i) Table feed in mm/min, (ii) MRR (iii) Power (iv) Torque and (v) Total machining time. Assumesuitable approach and over-run and specific energy of mild steel as 5 Ws/mm3.arrow_forward1. In face milling, the axis of the cutter is tangent to the surface being milled. (a) true or (b) false 2. When product variety is hard, the usual approach is batch production.(a) true or (b) false 3. In a turning operation, the change in diameter of the workpart is equal to which one of the following:(a) 1 x depth of cut, (b) 2 x depth of cut. (c) 1 x feed, or (d) 2 x fe feed? 4. A turning operation is normally performed on which one of the following machine tools: (a) drill press, (b) lathe, (c) milling machine, (d) planer, or (e) shaper? 5. Machined parts can be classified as rotational or nonrotational. Which of the following are examples of operations that create nonrotational geometries: (a) boring, (b) drilling, (c) milling. (d) planning, and (e) turning?arrow_forward
- d) A face milling operation is used to machine 6.0 mm from the top surface of a rectangular piece of aluminum 300 mm long by 125 mm wide in a single pass. The cutter has four teeth (cemented carbide inserts) and is 150 mm in diameter. The cutting speed = 2.8 m/s, and chipload = 0.27 mm/tooth. Assuming that the cutter enters the workpiece from its short side and follows a path that is centered over the workpiece, determine: i) the actual machining time to make the pass across the surface and, ii) the maximum metal removal rate during cutting.arrow_forwardExplain why and how, in milling I and J are used in circular interpolation.arrow_forwardIn a turning operation, cutting speed =200 m/min; feed = 0.25mm mm/rev, and depth of cut = 4.00mm Thermal diffusivity of the work material = 20m mm^2/s and volumetric specific heat =3.5(10^ -3 )J/mm^ 3 -C If the temperature increase above ambient temperature (20degreesC) is the angle measured by a tool-chip thermocouple to be 700degreesC, determine the specific energy for the work material in this operation.arrow_forward
- Expert Q&A Done The top surface of a rectangular workpart is machined using a peripheral milling operation. The workpart is 735 mm long by 50 mm wide by 95 mm thick. The milling cutter, which is 60 mm in diameter and has five teeth, overhangs the width of the part equally on both sides. Cutting speed = 80 m/min, chip load = 0.30 mm/tooth, and depth of cut = 7.5 mm. (a) Determine the time required to make one pass across the surface, given that the setup and machine settings provide an approach distance of 5 mm before actual cutting begins and an overtravel distance of 25 mm after 1.2 9. 20 65 73 actual cutting has finished v in seconds. (b) What is the maximum material 3.9 239 removal rate during the cut v in mm3/sec? 0.127 5arrow_forwardIn 3-axis milling, the table feedrate is 703.00 mm/min. Using a 10mm endmill to cut the material with a radial depth of 4.60 mm and axial depth of 4.20 mm, what is the material removal rate (Cm³ /min) in this operation? Your Answer: Answerarrow_forwardExplain the differences between the up milling and down milling?arrow_forward
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