Precision Machining Technology
3rd Edition
ISBN: 9781337795302
Author: Peter, Hoffman.
Publisher: Cengage Learning,
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Textbook Question
Chapter 6.2, Problem 1RQ
Many of the cutters used in machining are made of either __________________ or ____________________.
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Broaching is an example of __________________________________.
secondary machining process
joining process
surface finishing process
primary shaping process
How much machining time required to turn a mild steel rod from 65mm to
58 mm over a length of 100 mm by turning using a carbide insert. If the
approach length and over run length is
= 5 mm, Cutting speed is
20 m/min
and feed is =0.2 mm/rev, and the depth of cut is 0.5mm
D
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
Chapter 6 Solutions
Precision Machining Technology
Ch. 6.1 - What part of the vertical milling machine allows...Ch. 6.1 - Briefly describe the direction of movement...Ch. 6.1 - When a table handle is turned clockwise the table...Ch. 6.1 - What distance does the saddle or table usually...Ch. 6.1 - Prob. 5RQCh. 6.1 - Briefly describe the function of the turret and...Ch. 6.1 - What is the name of the taper found in most modem...Ch. 6.1 - What part of the vertical mill can be raised and...Ch. 6.1 - How can power quill feed be automatically stopped...Ch. 6.1 - What is a benefit of using a DRO instead of...
Ch. 6.2 - Many of the cutters used in machining are made of...Ch. 6.2 - What is the major advantage of using...Ch. 6.2 - Prob. 3RQCh. 6.2 - What type of cutting tool would most likely be...Ch. 6.2 - Which type of cutter would most likely be used to...Ch. 6.2 - What workpiece factors might cause a four-flute...Ch. 6.2 - List three types of milling cutters that are used...Ch. 6.2 - Most manual vertical milling machine spindles are...Ch. 6.2 - A __________ is used to retain the toolholder in...Ch. 6.2 - What type of toolholder might he selected for...Ch. 6.2 - Sketch a corner-rounding endmill.Ch. 6.2 - What toolholding device uses two drive keys and a...Ch. 6.2 - Prob. 13RQCh. 6.2 - List the four basic pieces of a step clamp set: a....Ch. 6.2 - Prob. 15RQCh. 6.2 - Irregularly shaped work may be held in a custom...Ch. 6.3 - List five safety guidelines to observe when...Ch. 6.3 - Briefly describe the process of aligning a milling...Ch. 6.3 - What is chip load?Ch. 6.3 - Define IPM.Ch. 6.3 - Calculate spindle speed and feed for the two...Ch. 6.3 - Briefly describe the process of locating the...Ch. 6.3 - What are two benefits of boring over other...Ch. 6.3 - What are face milling and peripheral milling?Ch. 6.3 - When squaring a block on the vertical mill, what...Ch. 6.3 - What are the three basic methods used to mill...Ch. 6.3 - What must first be done before milling with either...Ch. 6.3 - Prob. 12RQCh. 6.3 - What diameter cutter should be used to create...Ch. 6.3 - When roughing a pocket, should you machine in a...Ch. 6.4 - What is a rotary axis?Ch. 6.4 - Define the term indexing.Ch. 6.4 - Describe the primary differences between the...Ch. 6.4 - Name three types of workpiece features that are...Ch. 6.4 - Briefly describe the two alignment steps that need...Ch. 6.4 - If the outside of a 6"-diameter disk is to be...Ch. 6.4 - What is the gear ratio found in the gear train of...Ch. 6.4 - When using the indexing head, a __________ can be...Ch. 6.4 - A workpiece requires 9 divisions. Calculate the...Ch. 6.4 - In the formula 40D=T,what do T and D represent?
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- The following data is applicable for a turning operation. The length of job is 900 mm, diameter of job is 200 mm, feed rate is 0.25 mm/rev and optimum cutting speed is 300 m/min. The machining time (in min) is ___. A. 7.539 B. 7.90 C. 8.25 D. 9.00arrow_forward19. In bending operation of a piece of flat metal sheet. The final bend angle after springback is than the angle to which the part was bent. A. larger B. smaller C. not sure 20. Machining is a general term describing a group of processes that consist of the _ of material and modification of the surfaces of a workpiece after it has been produced by various methods. A. addition B. deformation C. changing D. removalarrow_forwardMachining time required reduce a mild steel rod of diameter 60mm, initial length (L) 125mm to final length (L1) 120mm to 58 mm by turning a carbide insert. If the approach length and over run length are 5 mm and 1 mm respectively, take Cutting speed as 20 m/min and feed is =0.2 mm/rev, and the depth of cut is 0.5mmarrow_forward
- In 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_forwardHow is chamfering done in a lathe? Make an illustrationarrow_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_forward
- A single-point cutting tool with 12° rake angle is used to machine a steel work-piece. The depth of cut, i.e. uncut thickness is 0.81 mm. The chip thickness under orthogonal machining condition is 1.8 mm. What is the shear angle.arrow_forwardUsing 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’sarrow_forwardThe tool life equation for HSS tool is VTO.14f 0.7d0.4 = Constant. The tool life (T) of 30 min is obtained using the following cutting conditions: V = 45 m/min, f = 0.35 mm, d = 2.0 mm If speed (V), feed (f) and depth of cut (d) are increased individually by 25%, the tool lifearrow_forward
- A face-milling operation is used to machine 5 mm from the top surface of a rectangular piece of aluminum 400 mm long by 100 mm wide. The cutter has four teeth and is 150 mm in diameter. Cutting conditions are V = 3 m/s, f=0.27 mm/tooth, and d = 5.0 mm. The cutter is centered over the rectangular workpiece. Determine (a) what is the spindle RPM? (b) what is the feed rate?arrow_forwardQuestion 19 Which of the following machine tools is the most suitable one for machining of relatively large batches with several operations? Answers: a. Toolroom lathe b. Turret lathe c. Vertical turret lathe d. Engine lathe e. Speed lathe Consider the following statements on milling machines 1. 2. Facing cutters have a tapered or straight shanks End mills usually are bolted at the end of a stub arbor 3 Plain milling cutters are used for profilling as well Answers: a. Only 2 and 3 are correct b. Only 1 and 2 are correct c. Only 1 and 3 are conect d. None of them is correct e Only 1 is correct Question 21 Find the incorrect statement about center type cylindrical grinding. (If you cannot find an incorrect statement among items a, b, c and d then code "e" for this question) Answers: & Workpiece rotates b. Grinding wheel rotates Usually workpiece traverses d, Depth of cut is usually determined by infeed of the grinding wheel e. All are correct Consider the following statements about…arrow_forwardIn orthogonal cutting, __________ are independent variables. I. Surface finish of cutting tool;II. Temperature rise in workpiece;III. Depth of cut;IV. Tool holder;V. Cutting force;VI. Stiffness of cutting toolarrow_forward
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