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 25, Problem 5RQ
Equation 25.4 for the MRR for drilling can be thought of as ________x______, where
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QUESTION 5
Determine the spindle speed (rpm), the feed rate (in/min) and the cutting power required for turning a 1º diameter copper rod with a depth of cut of 0.1" using a cemented carbide tool.
O N=287 RPM, F-25.8 in/min, P=9.7 hp
ON=2866 RPM, F=258 in/min, P=97 hp
ON=1146 RPM, F-25.8 in/min, P=97 hp
O N= 11460 RPM, F-340 in/min, P=130 hp
ON= 1146 RPM, F-34 inimin, P= 13 hp
ON= 115 RPM, F-3.4 in/min, P=1.3 hp
QUESTION 6
It is required to face mill an aluminum block to size it down from 2" to 1.5" thick using a 3" diameter 2-toothed carbide cutting tool. The block is 6.0" wide and 6" long. The entire tool diameter
engages the workpiece during the cut.
Calculate the recommended spindle speed in revolutions per minute, feed per tooth, and cutting power required.
O N=1529 RPM, f= 0.026 in/rev/tooth, P = 36 hp
O N-3820 RPM, f= 26 in/revitooth, P=27 hp
O N-3820 RPM, f= 0.052 in/rew/tooth, P=27 hp
ON-382 RPM, F= 0.026 in/revitooth, P = 0.027 hp
O N-3820 RPM, f= 0.052 in/rev/tooth, P=2.7 hp…
Write the NC part program for the part. Holes are threaded and requires two tools; T1 is a 0.5"
HSS drill bit and T2 is a 0.5" tapping bit. The rest of the features are cut using a 0.75" HSS
milling tool, T3. Feed rate and spindle speed are 10 ipm and 2000 rpm. The material is low-
carbon steel. Part thickness is 0.5”. Use dotted lines two show the path of tools movements.
Set up proper operation conditions as discussed in the class today.
Using the formula (below), calculate the revolutions per minute (rpm) a drill press spindle should rotate using a Ø1⁄2 HSS twist drill if the cutting speed will be 90 surface feet per minute, SPM?N~[4xV]÷DN = _____________________________________________ RPM’s
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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- Answer the following questions by circling True or False. 9. Ceramics are the hardest tool materials in the world. 10. The smaller the cutting ratio, the larger the cutting deformation. 11. A shaper can be used for maching flat surfaces in horizontal and angular directions. 12. During the return stroke of the shaper, the cutting tool will simply be sliding... 13. The cutting speed of the hydraulic shaper changes throughout most of the cutting stroke. 14. Arbour-mounted cutters are used in vertical axis machines to generate flat surfaces... 15. Dividing head is an important attachment that is used to divide the periphery of the workpiece into a number of divisions to machine surfaces.. () () ()arrow_forwardA drilling operation is performed to create a through hole on a steel plate that is 20 mm thick. Cutting speed = 0.4 m/s, and feed = 0.20 mm/rev. The 18-mm-diameter twist drill has a point angle of 120°. Determine the following once the drill reaches full diameter: a. the machining time and, b. the metal removal rate Equation used Tm TD₂L fvarrow_forward1. If a machinist wanted to drill a % inch hole in a piece of machine steel using a high speed steel drill. At what speed in revolutions per minute should he operate the drill press? 2. Find the revolutions per minute of an 8 mm drill if it is used to cut an aluminum workpiece using a high carbon steel drill. 3. The rpm setting of the drill press is set to 600 rpm. What is the maximum diameter in inches of a high speed drill if it is used to drill a tool steel material? 4. A drill press has the following rpm settings; 350, 600, 1100, & 1600. What rpm setting must be used if a 15 mm high speed steel drill is used to cut brass workpiece? 5. A machine operator drills a hole of a 3/8 inch diameter to a stainless steel using a carbon steel drill. He sets the drill press rpm setting to 900 rpm. Is he operating at correct setting? If not, then what must be the correct rpm setting considering that the machine has the following rpm settings of 300, 600, 900, 1200, and 1800?arrow_forward
- 11. With aid of neat sketches, explain the drilling parameters. 12. With aid of neat sketch, explain the main parts of the twist drill cutting tool. 13. With aid of neat sketch, explain the point angle of the twist drill. 14. With aid of neat sketch, explain what is the difference between the counter boring and counter sinking. 15. Define “NC" and "CNC" Terms.arrow_forwardHandwritten solution recommended. (1) A twist drill bit is used to drill a hole of diameter 2.0 at 4578.1 rpm at a feed rate of 2.5 in/min. Calculate the MRR in in^3/min. Take "pi" = 3.14. Round your answer to the nearest tenth.arrow_forwardQ.B5. a.) In a drilling operation, 3 blind holes needs to be drilled to a depth of 16 mm and a diameter of 8 mm. The point angle is 105° and the drill is made from HSS material. The bench drill allows a fixed speed of 1400 RPM and a feed of 0.1 mm per rev. The work part is mild steel with a thickness of 22 mm. Determine the time required to complete this operation. b.) What are some factors that determine the type of industrial cleaning that will be applied to a part? c.) In mass finishing, two key processes have been discussed - state both the processes here and explain their difference. d.) Draw and explain how a basic heading operation is carried out to produce nails.arrow_forward
- The part in Figure 1 is to be drilled on a turret-type drill press. The part is 15.0 mm thick. Threedrill sizes will be used: 8 mm, 10 mm, and 12 mm, which are to be specified in the part programby tool turret positions TO1, T02, and T03. All tooling is high speed steel. Cutting speed = 75mm/min and feed = 0.08 mm/rev. Use the lower-left corner of the part as the origin in the x-y axissystem. Write the part program in the word address format using absolute positioning.arrow_forwarda. If rough milling of mild steel is performed using High Speed Steel (HSS) side and face milling cutter of 100 mm diameter, what rpm should be used. b. If finish turning of a shaft is done to reduce its diameter from 24 mm to 20 mm using carbide tool, what rpm should be used. Metric Surface Speeds in m/min (Cutting Speed) Tool Material Aluminum Drilling Carbide 90 - 115 Milling - Rough Carbide Milling - Finish Carbide 120 - 240 Turning Carbide Rough Carbide Finish HSS HSS HSS 55 - 60 120 - 240 150 - 270 75 - 105 60 - 90 60 - 90 135 - 180 Brass 40 - 45 75 - 100 45 - 60 60 - 75 90 - 210 105 - 210 135 - 260 35 - 45 55 - 75 60 - 90 75 - 105 60 - 100 Cast Iron 12 - 18 15 - 25 25 - 30 60 - 90 75 - 135 Mild Steel 10 - 15 75 - 105 75 - 120 18 - 27 18 -3- 45 - 60 23 - 40 100 - 145 Stainless Steel 8 - 18 25 - 37 10 - 15 55 - 67 12 - 25 85 - 150arrow_forwardWhat is the diameter of a #10 twist drill?arrow_forward
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