DeGarmo's Materials and Processes in Manufacturing
12th Edition
ISBN: 9781118987674
Author: J. T. Black, Ronald A. Kohser
Publisher: WILEY
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Textbook Question
Chapter 25, Problem 17RQ
How does the thrust force vary with feed? Why?
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Chapter 25 Solutions
DeGarmo's Materials and Processes in Manufacturing
Ch. 25 - What functions are performed by the flutes on a...Ch. 25 - What determines the rake angle of a drill? See...Ch. 25 - Basically, what determines what helix angle a...Ch. 25 - When a large-diameter hole is to be drilled, why...Ch. 25 - Equation 25.4 for the MRR for drilling can be...Ch. 25 - Are the recommended surface speeds for spade...Ch. 25 - What can happen when an improperly ground drill is...Ch. 25 - Why are many drilled holes oversize with respect...Ch. 25 - What are the two primary functions of a...Ch. 25 - What is the function of the margins on a twist...
Ch. 25 - What factors tend to cause a drill to drift off...Ch. 25 - The drill shown in Figure 25.13 has coolant...Ch. 25 - Prob. 13RQCh. 25 - Why do cutting fluids for drilling usually have...Ch. 25 - How does a gang-drilling machine differ from a...Ch. 25 - Prob. 16RQCh. 25 - How does the thrust force vary with feed? Why?Ch. 25 - Holding the workpiece by hand when drilling is not...Ch. 25 - Prob. 19RQCh. 25 - In terms of thrust, what is unusual about the...Ch. 25 - Prob. 21RQCh. 25 - Prob. 22RQCh. 25 - What are the primary purposes of reaming?Ch. 25 - What are the advantages of shell reamers?Ch. 25 - A drill that operated satisfactorily for drilling...Ch. 25 - What precautionary procedures should be used when...Ch. 25 - What is the advantage of a spade drill? Is it...Ch. 25 - Prob. 28RQCh. 25 - Why does drill feed increase with drill size?Ch. 25 - Suppose you specified a drilling feed rate that...Ch. 25 - Suppose you wanted to drill a 1.5-in.-diameter...Ch. 25 - How much time will be required to drill the hole...Ch. 25 - What is the metal removal rate when a...Ch. 25 - If the specific horsepower for the steel in...Ch. 25 - If the specific power of an AISI 1020 steel of...Ch. 25 - Prob. 6PCh. 25 - Assume that you are drilling eight holes, equally...Ch. 25 - What machining difficulties should this process...Ch. 25 - Why were the distances between the holes too...
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- In a straight turning operations the diameter of a workpiece is reduced from 50 mm 40 mm using a feed rate of 0.1 mm/rev. The cutting tool used for the process has a normal working rake angle of 15°, clearance angle of 4° and a lead angle of 90°. The cutting force of 1200N and a thrust force of 660 N is measured during cutting operations. The workpiece material was stainless steel with a density of 7850 Kg/m³, thermal conductivity is 15 J/smK, specific heat is 480 J/kgK. The width of the secondary deformation zone divided by the chip thickness wo is assumed to be 0.2 for the above mentioned cutting conditions. The chip/tool contact length is measured as 1.5 mm. (a) Calculate the temperature rise in the primary deformation zone (b) Calculate the temperature rise in the secondary deformation zone (c) Calculate the maximum temperature if the room temperature is 24°C If the tool life for the average cutting velocity of 90 m/min is measured as 10 min. and for a cutting velocity of 160 m/min…arrow_forwardH.W! B A fully work-hardened Aluminium blank of 100mm diameter and 1.2 mm thickness has a constant flow Stress of 350 MPa. It is deep drawn in a constant thickness process to a cylindrical cup of somm mid-wall diameter. The blank-holder force is 30 KN and the friction coefficient is 0.1 a- what is the final height? b-what is the approximate value of the maximum Punch force ? Aus/a-37.5mm, b-57KNarrow_forwardWhay would the coefficient of friction be?arrow_forward
- Q.4- Write (True) or (False) and correct the wrong sentences for the following: 1. Chills are used to increase the heating rate of metal. 2. Motion of job is forward rotary in broaching operation. 3. The upset type of forging makes increment in the diameter of the workpiece. (1-2) Option 1 4. The torch size of (GTAW) process is larger than other (PAW) process. 5. Only two perpendicular components of cutting force act on the tool in case of oblique cutting. 6. The semicentrifugal casting, is used for casting articles of symmetrical shape about vertical axis. 7. In planer machine tool, workpiece remains stationary and tool reciprocates. 8. Boring is performed on the inside diameter of an existing hole. 9. In grinding processes, small grit sizes used to grind soft materials and permit larger material removal rates. 10. Side rake angle on tools is provided to control chip flow.arrow_forward34 - The outside diameter of a cylinder made of titanium alloy is to be turned. The starting diameter is 400 mm and the length is 1100 mm. The feed is 0.35 mm/rev and the depth of cut is 2.5 mm. The cut will be made with a cemented carbide cutting tool whose Taylor tool life parameters are: n= 0.24 and C-450. Units for the Taylor equation are min for tool life and m/min for cutting speed. Compute the cutting speed that will allow the tool life to be just equal to the cutting time for this part. vT" = C . AD,L Tm %3D fv a) 325.8 m /min b) 275.8 m/min 226.6 m/min d) O 187.9 m/minarrow_forwardThe outline of the part in the Figure below is to be profile milled using a 20- mm diameter end mill with two teeth. The part is 10 mm thick. The cutting speed = 125 m/min and feed = 0.10 mm/tooth. The part is also to be drilled with a drill size of 10 mm corresponds to T01 with a cutting speed =75 mm/min and feed = 0.08 mm/rev. The two holes pass completely through the part. 30 rad. 125.75 10 dia., 2 holes Write the part program (G & M code program) for the required machining processes. Use absolute programming with the lower left 25 corner of the part as the origin in the x-y axis system. 150 (All dimensions are in mm.) 25 50 75 35 deg.arrow_forward
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