Name: Class: Date: ID: A Study Guide - CNC Principles Multiple Choi Identihy the

Question

Name: Class: Date: ID: A Study Guide - CNC Principles Multiple Choi Identihy the choice that best completes the statement or answers the question In CNC Machining, G90 (absolute coord. system) and G91 (incremental coord. system) would make a difference in which of the following? a. The toolpath b. The direction of cutter rotation 1. e. The machine origin d. All of the above In CNC machining, how are the primary lincar axes designated? a. 2. c. U, V, W d. I,J, K A, B. C 3. In CNC machining, how are the primary rotary axes designated? c. U, V, W d. I,J,K On a typical four axis wire EDM machine, one set of coordinates is designated as X and Y. How are the other two axes identified? a. A and B b. U and V 4. c. d. I andJ X2 and Y2 5. When identifying axes on a typical machine tool, this axis is usually the easiest to find because it is the axis about which the spindle rotates a. The X axis b. The Y axis c· d. The Z axis The rotary axis Which of the following is true? a. b. 6. A is rotation about the X axis B is rotation about the Y axis c. d. C is rotation about the Z axis All of the above

Explanation / Answer

1.d

description:In the absolute mode, the end points for all motions will be specified from the program zero point.In the incremental mode (commonly specified by G91), end points for motions are specified from the tool's current position, not from program zero.

In the absolute mode, if a motion mistake is made in one command of the program, only one movement will be incorrect. On the other hand, if a mistake is made during incremental movements, all motions from the point of the mistake will also be incorrect.

2.b

3.a

Description for above 2 bits:The CNC programmer MUST know the programmable motion directions (axes) available for the CNC machine tool. The axes names will vary from one machine tool type to the next. They are always referred to with a letter address. Common axis names are X, Y, Z, U, V, and W for linear axes and A, B, and C for rotary axes.

4.b

description:A modern Wire EDM machine has 4 independent axes of movement (5 if counting Z). The position of the wire guides can be independently and precisely controlled both above and below the part which allows "tipping" of the wire in any direction (often to 20° or even more). The 2 axes "below" the part are known as X/Y, and the 2 axes "above" the part are known as U/V. The U and V axis are actually "differential" axis in that moving X/Y moves the entire wire in relation to the part while keeping it vertical, while moving U and/or V moves the top of the wire relative to X/Y.

5.a

Description:the spindle axis is stationary with respect to x-axis.

6.d

description:It rotates along the X axis (so we call that the A rotary axis) and the Y axis (called the B rotary axis),and the Z axis(called the C rotary axis).

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