- What is the function of an N/C program?
- N/C programs always assume the cutting tool moves around the workpiece even though the the workpiece actually moves around the tool. (T / F )
- Name the three axes of motion in an N/C mill.
- Name the axis that moves right and left on a vertical spindle N/C mill.
- Name the axis that moves toward and away from the operator on a vertical spindle N/C mill.
- Name the axis that moves toward and away from the operator on a horizontal spindle N/C mill.
- Name the axis that is parallel to the spindle on an N/C lathe.
- Name the axis that doesn't exist on an N/C lathe.
- Explain what an "origin" is and how its location is determined.
- The two N/C positioning methods are _____________ and _______________.
- N/C commands that stay in effect until changed or canceled are said to be _________________.
- One-shot N/C commands are said to be ___________.
- What is a group of N/C commands that is similar to an English language sentence called?
- Describe the function of the EOB character.
- Which key on the keyboard or data-entry terminal usually generates the EOB character?
- Which N/C format has the characteristic that every block must have exactly the same number of characters.
- Which N/C format has the characteristic that unneeded command data can be "skipped over?"
- The special-purpose electronic "pigeon holes" in an N/C controller that store command data are called ___________.
- List the more commonly used address words and describe their functions.
- Explain the significance of each group of characters in the following EIA-274-D data format specification:
N4.0 G2.0 XYZIJK2.4 F2.1 S4.0 M2.0
- To what does EIA refer?
- To what does EIA-274-D refer?
- Describe the purpose of tool length offsets (TLOs).
- Describe how TLO data are loaded into a TLO register.
- When writing a program for an N/C machine that has no TLO registers, how does a programmer account for the difference in length of the various cutting tools?
- Describe how the controller executes a subroutine.
- Describe what a loop does in an N/C program.
- Describe the three "elements" that must be present in an N/C program loop.
- Describe "nesting" of loops and subroutines.
- Describe the three essential N/C programming elements.
- The three factors used to calculate an IPM feedrate for an N/C machining operation are
- _________, and
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Updated Jan. 9, 2002
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