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 27, Problem 3P
Estimate the (approximate maximum) horsepower needed to accomplish the operation described in Problem 2 at a cutting speed of 10 m/min. (Hint: First find the HP used per tooth and determine the maximum number of teeth engaged at any time. What are those units?)
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3. It is required to machine a slot with length 100 mm, width 15 mm, and depth 4 mm. Calculate
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A motorised metal guillotine machine is required to cut 45 mm diameter hole in a plate of 20 mm thickness at rate of 35 holes per minute. It requires a torque of 7 Nm for an area of hole in mm². If the cutting takes 1/10 of a second and the speed of it's flywheel varies from 165 rpm to 145 rpm, calculate
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Chapter 27 Solutions
Degarmo's Materials And Processes In Manufacturing
Ch. 27 - Why is sawing one of the most efficient of the...Ch. 27 - Explain why tooth spacing (pitch) is important in...Ch. 27 - What is the tooth gullet used for on a saw blade?Ch. 27 - Explain what is meant by the set of the teeth on a...Ch. 27 - How is tooth set related to saw kerf?Ch. 27 - Why can a bandsaw blade not be hardened throughout...Ch. 27 - What are the advantages of using circular saws?Ch. 27 - Why have bandsawing machines largely replaced...Ch. 27 - Explain how the hole in Figure 27.7 is made on a...Ch. 27 - How would you calculate or estimate Tm for a...
Ch. 27 - What is the disadvantage of using gravity to feed...Ch. 27 - What is unique about the broaching process...Ch. 27 - Can a thick saw blade be used as a broach? Why or...Ch. 27 - Broaching machines are simpler in a basic design...Ch. 27 - Why is broaching particularly well-suited for mass...Ch. 27 - In designing a broach, what would be the first...Ch. 27 - Why is it necessary to relate the design of a...Ch. 27 - What two methods can be utilized to reduce the...Ch. 27 - For a given job, how would a broach having...Ch. 27 - Why are the pitch and radius of the gullet between...Ch. 27 - Why are broaching speeds usually relatively low,...Ch. 27 - What are the advantages of shell-type broach...Ch. 27 - Why are most broaches made from alloy or...Ch. 27 - What are the advantages of TiN-coated broaching...Ch. 27 - For mass-production operations, which process is...Ch. 27 - What is the difference between the roughing teeth...Ch. 27 - The sides of a square, blind hole must be machined...Ch. 27 - The interior, flat surfaces of socket wrenches,...Ch. 27 - Prob. 29RQCh. 27 - What are some ways to improve the efficiency of a...Ch. 27 - To what extent is filing different from sawing?Ch. 27 - Prob. 32RQCh. 27 - Prob. 33RQCh. 27 - Prob. 34RQCh. 27 - A surface 12 in. long is to be machined with a...Ch. 27 - The pitch of the teeth on a simple surface broach...Ch. 27 - Estimate the (approximate maximum) horsepower...Ch. 27 - Estimate the approximate force acting in the...Ch. 27 - In cutting a 6-in.-long slot in a piece of AISI...Ch. 27 - The strength of a pull broach is determined by its...Ch. 27 - Suppose you want to shape a block of metal 7 in....Ch. 27 - Could you have saved any time in Problem 7 by...Ch. 27 - Derive the equation for shaping cutting speed.Ch. 27 - How many strokes per minute would be required to...Ch. 27 - How much time would be required to shape a flat...Ch. 27 - What is the metal removal rate in Problem 11 if...Ch. 27 - Suppose you decide to mill the flat surface...Ch. 27 - A planer has a 10-hp motor, and 75% of the motor...
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- Given that the length of a work-piece made from copper alloy to be face-milled is 250 mm and the width is 25 mm. The cutter diameter is 150 mm and the tooth number is 10. 1. If it takes 20 seconds to perform the cutting, suggest a cutting speed (in mm/s) and a feed (in mm/rev) to be used. 2. Give another set of values of cutting speed (in mm/s) and feed (in mm/rev) that can give the same cutting time as above.arrow_forwardCalculate the machining time to drill four 20 mm diameter holes and one 50 mm diameter central hole in the flange as shown below. Take cutting speed 20 m/min, feed for 20 mm drill 0.2 mm/rev, and for 50 mm drill feed is 0.6 mm/rev, the point angle is 120°? VIVER 20xA 200 D100 SYLON 50arrow_forwardsolvearrow_forward
- A motorised metal guillotine machine is required to cut 45 mm diameter hole ina plate of 20 mm thickness at rate of 35 holes per minute. It requires a torqueof 7 Nm for an area of hole in mm?. If the cutting takes 1/10 of a second andthe speed of its flywheel varies from 165 rpm to 145 rpm, calculate:1.Energy required to cut a hole.2.Energy required for cutting work per second.3.Maximum fluctuation of energy of the flywheel.4.Mass of the flywheel having radius of gyration of 1.5 m.arrow_forwardIt is required to reduce the thickness of cast iron workpiece with dimensions (L x w x t) of (230 mm x 120 mm x 25 mm) to 22 mm using shaper machine. Given that average cutting speed is 21 m/min, feed 1.2 mm/double stroke, and return/cutting time ratio is 3/4. The approach at each end is 72 mm. If the permissible depth of cut is 2 mm, determine the cutting time in the following cases: i) Using shaper with a mechanically driven ram. ii) Using shaper with a hydraulically driven ram. Solution: i) Mechanically ( ii) Hydraulicallyarrow_forwardA shaper is operated at 120 cutting strokes per minute and is used to machine a work piece of 250 mm in length and 120 mm wide. Use a feed of 0.6 mm per stroke and a depth of cut of 6 mm. Calculate the total machining time to for machining the component. If the forward stroke is completed in 230°, calculate the percentage of the time when the tool is not contacting the work piece.arrow_forward
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