nims turning – Flashcards
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Which of the following statements best defines cutting speed:
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Cutting speed is based on the distance the work moves past the tool based on the number of feet that passes the tool in one minute and is given in surface feet per minute
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Which of the following statements best defines feed?
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The machine movement that causes a tool to cut into or along the surface of a work piece
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When calculating the RPM for a turning operation, the machinist uses _________ instead of the diameter of the tool.
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The diameter of the work piece
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What is the RPM needed to drill a .750" hole in mild steel with a cutting speed of 100 SFM on 3.50" diameter stock (use 3.82 for the constant)?
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262.5 RPM
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A part is being turned at 250 RPM with a feed rate of .008 inches per revolution. How long will it take to make one pass if the part is 10.625 inches long?
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5,30 minutes
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Identify the proper formula for determining the RPM for a turning operation:
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(CS • 3.82) / D
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How is a feed rate designated on a lathe?
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Inches per revolution
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The feed rate is at .008 IPR. How many RPM will it take to move the tool a distance of 3.600 inches in a minute?
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450 RPM
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Which of the following formulas is the correct formula for determining the time to make one cut across a given distance? {T = time f = feed (IPR) L = length of cut (inches) N = spindle speed (RPM)}
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T = L / (fN)
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Which of the following shapes cannot be held adequately by a 3-jaw universal chuck:
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octagon
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The included angle of a lathe center measures:
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60°
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The primary advantage of turning between centers is that:
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The work piece can be turned end for end without losing concentricity
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Identify the statement that is not characteristic of a lathe steady rest:
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The jaws on a steady rest are made of hardened tool steel
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Which of the following statements does not describe a universal chuck:
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Each jaw can move independently of the others with the jaws always being soft
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The work holding device best used to clamp round, square or irregular shaped pieces is a/an:
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Independent chuck (4-jaw chuck)
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A drilling and boring operation has to be performed on one end of a shaft measuring 3" in diameter and 25" long. Which of the following methods provides the most stable set up?
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A three jaw universal chuck and a steady rest
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Which of the following statements is a step for clamping a square block using a 4-jaw chuck?
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Use the concentric rings on the chuck to visually align the jaws and work piece on center, then use a dial indicator for final alignment
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Which of the following accessories is attached to the carriage and used to support long thin shafts?
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follower rest
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Which of the following is not characteristic of the gibs found in the cross slide and compound slide?
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The gibs are adjusted to maintain a .003" clearance gap that is checked with a feeler gage
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The size of the lathe is determined by:
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Length of the bed and The largest diameter of material capable of turning
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A taper can be defined by:
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Taper per foot (tpf), Taper per inch (tpi), Included angle in degrees, Angle with the centerline in degrees
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Name the tool and process used to precisely enlarge an existing hole:
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boring bar, boring
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Reaming operations on a lathe require less RPM than drilling for the same diameter. The RPM for reaming is approximately _________ the RPM for drilling.
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one-half
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To prevent the creation of a small protrusion when performing a facing operation, the machinist must set the tool point:
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on center
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Which of the following is not characteristic of a parting operation?
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The RPM is the same as for drilling the same diameter
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Knurling is:
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A raised impression on the surface of a turned work piece, Displacement of material and not impressions caused by a cutting action, Usually produced with hardened rolls that create a pattern
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Which of the following is not part of a procedure for knurling?
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Do not lubricate the knurling tool and work piece
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To machine ream a hole on the lathe, the machinist should:
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Use twice the feed rate for a drilling operation with the same diameter
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If the tailstock is offset in a direction away from the operator, the shaft will:
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Have a taper with the end by the tailstock being larger
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A trail cut was taken on the lathe. The readings on the work piece are 2.240" at the headstock end and 2.220" at the tailstock end. To align the centers, the machinist should adjust the tailstock:
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.010 inches away from the operator
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A small tip was left on the end of the part when performing a facing operation. The root cause of this problem is:
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Setting the tool slightly below center
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Lathe center runout in the headstock may be caused by:
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Burrs and nicks on the center sleeve or spindle, Chips inside the spindle area that accommodates the lathe center, The angle and centerline of the angle was ground off center from the center axis
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Which of the following is not a true statement for taking the first cut on a cast iron shaft?
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apply heavy cutting oil
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Which of the following statements best describes a root cause for excessive tool wear when machining a hard material?
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The RPM is set to high
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Which of the following type of personal protective equipment (PPE) is best for turning operations:
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safety glasses with side shields
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Which one of the following types of information is not found on MSDS?
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container size
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Which one of the following colors is not found on HMIS stickers?
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green
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Which one of the following steps should not be performed when lifting heavy objects?
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life with the arms only, keeping the back hunched
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If a small particle becomes lodged in the eye, the first step for self-imposed first aid is to:
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Pull the top lid over the bottom lid to help dislodge the particle
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Which of the following are potential safety hazards when operating a lathe?
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Removing long stringy chips with bare hands, Removing shields when turning to view the operation
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The feed reverse lever will reverse the direction of the __________ and controls the direction of movement for both the _________and the __________:
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leadscrew, crossfeed, longitudinal feed
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To change the RPM on a geared head lathe, the machinist must:
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Shift speed change levers and feed selection levers
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The main function of the lathe half-nut lever is to facilitate:
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threading
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The distance the carriage moves per revolution of the spindle is determined by:
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quick change gear box
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On most lathes, the crossfeed speed is about ___________ that of the longitudinal feed.
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one third to one half
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What is the angle formed by the sides of the thread for an American National thread form?
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60°
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A ____________ is used to align a single point threading tool with the work piece.
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center gage
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The compound rest is set perpendicular to the axis of the work piece (centerline of the lathe). To cut (chase) an external right-handed thread, the compound rest must be swiveled:
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29.5° to the right
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The compound rest is set perpendicular to the axis of the work piece (centerline of the lathe). To cut (chase) an internal right-handed thread, the compound rest must be swiveled:
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29.5° to the left
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Using the Machinery's Handbook as a reference, calculate the amount of infeed for an American Standard Unified Inch Screw thread form with 18 threads per inch. Use the following equation: P pitch Infeed P .708 = = •
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.03934
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Using the Machinery's Handbook as a reference, calculate the diameter of a hole for an RC1 clearance fit with a 2.000 inch diameter shaft:
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2.0005
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Using the Machinery's Handbook as a reference, determine the tap drill diameter that will produce a 75% thread for a ¾-10 American National form thread:
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21/32 drill
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Using the Machinery's Handbook as a reference, calculate the diameter of a shaft for an LN2 interference fit with 1.500 inch diameter hole:
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1.5013
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The process plan calls for a 2.5" diameter clearance fit hole. The best process plan is to:
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Center drill, double drill, bore
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What is the tap drill for a ½-14 American National Pipe thread?
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23/32 drill
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What feature of a screw thread is measured with a screw thread micrometer?
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pitch diameter
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Surface finish can be checked with a profilometer or a:
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Surface finish comparison chart
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Each division found on the thimble of a micrometer is equal to ________ and each division found on the sleeve is equal to ___________.
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.001, .025
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One factor to consider when choosing the appropriate measuring device to measure a specific feature of a part is the:
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The tolerance of the dimension to inspect
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An X-bar R chart is used with control charts to monitor:
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Variation between sample sets of parts
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Control charts measure the range. The range can be defined as:
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The difference between the largest reading and smallest reading of a sample set
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A part can be rejected when:
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A dimension is made out of tolerance, The wrong material is used, The part does not follow the process flow, The wrong revision of the print is used to make the part
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Which of the following provides the highest level of repeatability when turning a shoulder on a work piece held in a lathe?
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Compound rest set parallel to the centerline axis of the lathe
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The compound rest can be rotated:
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360°
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Identify the best method for aligning centers when turning between centers:
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Take a trial cut and measure each end with a micrometer
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To align lathe centers using a dial indicator and a test bar, the plunger of the dial indicator should be set:
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Perpendicular to the lathe center axis, On center, In a horizontal position
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A high-speed steel lathe tool bit has to be ground. Which characteristics of the lathe tool bit must be ground first?
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Side relief angle and the side cutting angle
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Which of the basic precision layout tools is used with a height gage?
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surface plate
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Which of the following instruments is not capable of making fine lines on a metal surface?
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machinist square or a combination set scale
