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A comprehensive set of practice test questions and answers covering various aspects of cnc machining. It covers topics such as cnc lathe and mill operations, programming, coordinate systems, tool types, workholding devices, and machine setup procedures. The questions are designed to test understanding of fundamental concepts and practical applications in cnc machining.
Typology: Exams
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When a CNC lathe is equipped with an automatic tool changer it is called a ______. - Correct Answersturning center CNC mills with an ATC are called _____. - Correct AnswersMachining Centers The CNC program is created and stored in the _____. - Correct AnswersMachine control unit A(n) _____ assembly device consists of a screw and nut assembly with steel balls in place of threads. - Correct AnswersBall screw Most modern CNC machines employ a high-tech modernized version of ways called _____. - Correct AnswersLinear guides A(n) _____ motor is a hybrid electric motor with half motor / half position sensor. - Correct AnswersServo A(n) _____ works by recording the amount of rotation a motor makes (in degrees). - Correct AnswersEncoder CNC programming does not use north, south, east, or west to identify distance and direction, but instead a similar system called the _____ system. - Correct AnswersCartesian coordinate The place a traveler begins from is called the point of _____. - Correct AnswersOrigin The X- and Y- axes of the Cartesian coordinate system divides the system into four separate regions called _____. - Correct AnswersQuadrants
_____ coordinates require that positions be identified by defining both an angle and a distance (like a vector in mathematics). - Correct AnswersPolar When using _____ positioning, the coordinates of all positions will be referenced from the beginning. - Correct AnswersAbsolute The _____ positioning system specifies a distance from the current position to the next position instead of a location related to the origin. - Correct AnswersIncremental Programming code that the machine can understand is called _____ address. - Correct AnswersWord _____ - codes prepare a machine to engage in a particular mode for machining. - Correct AnswersG _____ traverse is designated by the code G0. - Correct AnswersRapid Linear interpolation produces a(n) _____ line between two points. - Correct AnswersStraight _____ interpolation motion causes the cutter's path to travel in an arc. - Correct AnswersCircular _____ - codes are used to turn on and off miscellaneous (auxiliary) functions. - Correct AnswersM _____ programming was developed to simplify the machine programming process. - Correct AnswersConversational At the very end of each block is a semicolon (;) character is called a (n) _____ character. - Correct AnswersEnd of block
_____ tools are small motorized spindles that enable a turning machine to perform light- duty milling and to perform hole-work such as drilling, tapping, and reaming off-center and cross-ways. - Correct AnswersLive A _____ is an auxiliary secondary spindle, which opposes the machine's main headstock spindle. - Correct AnswersSub-spindle Most turning centers are fitted with a circular _____ where all of the tooling is mounted. - Correct AnswersTurret _____ type machines typically are of a flat bed design and are fitted with a carriage where tools are installed. - Correct AnswersGang tool _____ tool-mounting adapters have a rough shank with a serrated tooth pattern. - Correct AnswersVDI _____ consist of a straight round shank with a tapered bore. - Correct AnswersHardinge HDB drill bushings A _____ is a tool that is mounted to the turret and, when programmed, can approach the remaining bar material after a part has been cut off. - Correct AnswersBar puller _____ are versatile because they can hold a broad range of diameters and can be used to grip on either the OD or ID of workpieces. - Correct AnswersChucks _____ mode provides a blank program screen for entering short programs or single program commands required for machine setup. - Correct AnswersMDI Axis _____ buttons and a small rotary handwheel allow manually controlled axis movement for machine setup. - Correct AnswersJog The _____ knob allows the programmed feed rate to be decreased, increased, or even stopped. - Correct AnswersFeed rate override
_____ controls slow rapid motion while a program is running or vary the jogging rate. - Correct AnswersRapid override The Cartesian coordinate system that identifies the location of the origin on the workpiece is called the _____. - Correct AnswersWCS The _____ is used for the machine's own reference purposes and helps it to keep track of how far each axis can move before it runs out of travel. - Correct AnswersMCS The distance from the MCS to the WCS is called _____ offset. - Correct AnswersWork After the machine has been properly turned on, most machines require a reference return to the machine's origin, or _____ position of the MCS. - Correct AnswersMachine home Once tool measurements have been determined, those tool offset measurements are stored in the machine's _____ offset page. - Correct AnswersGeometry _____ offsets may be used to compensate and adjust for wear as the tool is used during production. - Correct AnswersWear When using TNRC, the tool tip _____ orientation must also be entered in the geometry offset page. - Correct AnswersQuadrant _____ is the method whereby the machine control only accepts as much code as it can process at a time. - Correct AnswersDNC _____ allows verification of the paths the tool will take by watching a simulated computer model cut the part on a display screen. - Correct AnswersGraphic simulation Generically speaking, a _____ refers to running a machine with disabled functions to eliminate the potential for collisions. - Correct AnswersDry run _____ mode allows the ability to execute only one block of the program at a time. - Correct AnswersSingle-block
_____'s popularity is due partly to the versatility of workholding, the inherent rigidity of the machine's column, and the ability to allow gravity to help remove chips out of the machining area. - Correct AnswersHMC The configuration of a modern _____ can be compared to a standard vertical knee-type mill. - Correct AnswersVMC The _____ tool changer uses a double-ended arm to change tools. - Correct AnswersSwing-arm type The _____ knob is gripped by a power-actuated drawbar mechanism in the machine spindle to secure the mating tapers. - Correct AnswersRetention The _____ flange was originally developed specifically for CNC used by Caterpillar Inc. - Correct AnswersCAT The _____ flange holders have a thicker flange with an off-center groove. - Correct AnswersBT _____ holders are inexpensive, rugged, simple, and capable of transmitting a lot of torque, but there are a few disadvantages. - Correct AnswersEndmill _____ vises are the most commonly used workholding devices for milling because they are highly versatile, accurate, and simple to use. - Correct AnswersMachine _____ systems use two or more workholding tooling plates that can be quickly and accurately interchanged on the machine's table. - Correct AnswersPallet Most commonly used in horizontal spindle machines, a _____ is a tower with multiple vertical working surfaces where workholding devices are mounted. - Correct AnswersTombstone Often a part has a unique shape and needs precise location along with a highly secure clamping system for which a custom _____ can be used. - Correct AnswersFixture
_____ mode provides a blank program screen for entering short programs or single program commands. - Correct AnswersMDI The _____ is used for the machine's own reference purposes and helps it to keep track of how far each axis can move before it runs out of travel. - Correct AnswersMCS The _____ procedure is used to re-zero and establish MCS location so that it may begin keeping track of position again. - Correct AnswersHoming When an indicator reads _____ throughout a full sweep, the spindle has been aligned with the centerline of the round feature. - Correct AnswersZero Once the tool measurement has been determined, the tool offset measurements are stored in the machine's _____ offset page. - Correct AnswersGeometry _____ offsets are used when a size adjustment needs to me made after a given tool has been satisfactorily producing parts for a while. - Correct AnswersWear _____ is a quick way to troubleshoot obvious programming issues, but doesn't analyze an actual machine setup or small positioning errors. - Correct AnswersGraphic simulation Once the production performance is proved satisfactory, the machine is now ready to be run in _____ mode. - Correct AnswersAutomatic