rees) answer only ten of the following multi choice questions.1. In CNC machine tools, the motors used to control feed rate are:A. Servo motorsB. Induction motorsC. Stepper motorsD. Hydraulic motors2. The purpose of a feedback device in a CNC machine tool is to provide information of:A. SpeedB. DisplacementC. ForceD. Both speed and displacement3. Federate on a machining center can be specified in:A. Only feed per revolutionB. Either feed per minute or feed per revolutionC. Only feed per minuteD. Feed per tooth per revolution4. The correct syntax of an NC block for inclined line milling operation is:A. N-G01 X-F-B.N-G01 Z---F---C. N-G01 X-Y--F---D. N-G01 M X Y F...5. When the contour or continuous path system is used,A. Tool movement from one point to the next does not have to follow a specific path.B. Tool travel is controlled along ong axis at a time.C. Machine and tool movements are precisely controlled at all times and in all planes.D. None of the above.6. Which of the following NC blocks is correct?A. N10 G01 M03 X90 Y-15 R22B. N10 G02 M06 Y15 S800C. N10 G00 X100 Y85 $1000D. N10 G02 M03 Y-22 FO.2 S12007. A stepper motor:TDA. Can control the angular displacement quite preciselyB. Cannot control the angular displacement preciselyC. Cannot be used for positioning of tables and tools in CNC machine toolsD. Cannot be readily interfaced with microprocessor-based controller8. Program coordinates that are based on a fixed origin are called:A. Incremental8. AbsoluteCartesianD. RelativePage 3 of 4ENTIAL

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grees) answer only ten of the following multi choice questions. 1. In CNC machine tools, the motors used to control feed rate are: A. Servo motors B. Induction motors C. Stepper motors D. Hydraulic motors 2. The purpose of a feedback device in a CNC machine tool is to provide information of: A. Speed B. Displacement C. Force D. Both speed and displacement 3. Federate on a machining center can be specified in: A. Only feed per revolution B. Either teed per minute or feed per revolution C. Only feed per minute D. Feed per tooth per revolution

grees) answer only ten of the following multi choice questions. 1. In CNC machine tools, the motors used to control feed rate are: A. Servo motors B. Induction motors C. Stepper motors D. Hydraulic motors 2. The purpose of a feedback device in a CNC machine tool is to provide information of: A. Speed B. Displacement C. Force D. Both speed and displacement 3. Federate on a machining center can be specified in: A. Only feed per revolution B. Either teed per minute or feed per revolution C. Only feed per minute D. Feed per tooth per revolution

Precision Machining Technology (MindTap Course List)

2nd Edition

ISBN:9781285444543

Author:Peter J. Hoffman, Eric S. Hopewell, Brian Janes

Publisher:Peter J. Hoffman, Eric S. Hopewell, Brian Janes

Chapter8: Computer Numerical Control

Section8.5: Introduction To Cnc Milling

Problem 7RQ: A programmable indexing fixture creates a fourth axis called a ________ __________ that is similar...

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Answer the following questions by circling True or False. 1. Capstan and turret lathes utilise many tools simultaneously to improve the productivity. ... 2. Lead screws in the machine tools can convert linear motion to rotary motion. 3. Automatic lathes are used for medium batch production. 4. Arithmetic progression is preferred for higher spindle speeds. 5. Tool layouts can be converted into a cam profile that is used for the control of the tool. () () 6. Higher the rake angle, less the cutting forces. 7. A very large clearance angle increases the strength of the tool tip. 8. The continuous chip causes poor surface finish and low tool life. 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…
1. The precision of CNC system depends on used by the controller to the ... ... define the axis coordinate location. * Number of bits All choices Machine language Worker skills
The following jobs are waiting to be processed at a small machine center: JOB 10 20 30 40 50 DUE DATE 260 254 260 265 275 days (round your response to one decimal place). days (round your response to one decimal place). DURATION (DAYS) 18 T 22 14 32 All dates are specified as manufacturing planning calendar days. Assume that all jobs arrived on day 200 (yesterday) in the order shown but are not scheduled to begin until day 201 (today). a) Sequence the jobs according to LPT. According to the LPT rule, the sequence of jobs should be 50, 20, 10, 30, 40 b) What is the average completion (flow) time? The average completion (flow) time is c) What is the average job lateness? The average job lateness is d) What is the average number of jobs in the system? The average number of jobs in the system is jobs (round your response to one decimal place). 62446
27. You have the following compound machine. For S and ins a. What is the ideal mechanical advantage of this system? The inclined plane dimensions are 7.2 meters length and 1.8 meters height. What effort force is required to move the 600N create? In practice, you need to supply an effort force of 75 N to lift the crate. What is the efficiency? C. How could you redesign this compound d. machine so that the effort force needed was 50 N in practice? Assume the efficiency is your response from part C no matter what changes you make. Be specific with the changes you propose (if you add pulleys state how many, if you change the inclined plane dimensions state the new dimensions, etc.).
The following data were obtained in a study taken on a horizontal milling machine:Parts produced per cycle: 8.Average measured cycle time: 8.36 minutes.Average measured stress time per cycle: 4.62 minutes.Average fast traverse time: 0.08 minutes.Average cutting time with electrical power: 3.66 minutes.Performance rating: 115%.Clearance (machine time): 10%.Slack (effort time): 15%.The operator works on the task 8 hours a day and produces 380 parts. How many standard hours does the operator work? What is the operator's efficiency for the 8-hour day?
The following data were obtained in a study taken on a horizontal milling machine:Parts produced per cycle: 8.Average measured cycle time: 8.36 minutes. Average measured stress time per cycle: 4.62 minutes. Average fast traverse time: 0.08 minutes. Average cutting time with electrical power: 3.66 minutes. Performance rating: 115%. Clearance (machine time): 10%. Slack (effort time): 15%. The operator works on the task 8 hours a day and produces 380 parts. How many standard hours does the operator work? What is the operator's efficiency for the 8-hour day?
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A programmable indexing fixture creates a fourth axis called a ________ __________ that is similar to a rotary table used on a manual milling machine.
If a G1 code command is programmed partway through a machining operation, but no F-value is given in that block, what feed rate will be used?
A robot is used for loading and unloading of parts to automated flexible machines. Loading time is 1 minute; unloading time is 1.5 minutes; machining time 15 minutes; Robot travel time between the machines including the inspection time is 3 minutes. Cost of robot C,=30 TL/Hour; cost of machines C2=40 TL/Hour. How many machines (integer number) should be assigned to the robot so that the total robot and machine costs per cycle are minimized? 8 - 176 a) 4 b) 3 c) 2 d) e) 6.
An articulated robot loads and unloads a CNC machine tool. The cell is scheduled to produce abatch of 300 parts. Setting up the cell for this part style takes 30 min, programming the robot takes75 min, and programming the CNC machine tool takes 55 min. For safety reasons, these threesetup activities must be done sequentially. The programmed machining cycle takes 3.75 min.Cutting tools wear out and must be periodically changed, which takes 6.0 min every 20 cycles andis performed by a human worker. At the end of each machining cycle, the robot reaches into themachine and removes the just-completed part, places it in a parts storage carousel, then reachesfor a starting work part from the same carousel and places it in the machine tool fixture. Thissequence of handling activities takes 45 sec. The storage carousel holds 25 parts. At the beginningof the production run, it is full of raw work parts. As each part is retrieved by the robot, the carouselindexes one position to present a new raw…
FOR A FANUC 6 axis robot Why do we use the “LBL” statement in a program? flow chart