,
, MET 320L Lab Assignment 1.3 – Introduction
to Manual G-Code | 2D CNC Cutting Machines,
G90/G91, G92, G54-G59, G00 & G01 |
Complete Lab | 2026/2027 update - ECPI
University
SECTION 1: G-CODE FUNDAMENTALS & PROGRAM
STRUCTURE (Questions 1–10)
1. What does the letter "O" represent at the beginning of a CNC
program?
A) Operator number
B) Program number
C) Origin offset
D) Output speed
Correct Answer: B
Rationale: The "O" address is used for the program number, which
identifies the program and must be at the top of the program. Program
numbers can range from 00001 to 09999, though the total number of
programs is limited by the machine's memory .
Source: Machinist 2nd Year Trade Theory; G-Code Reference Sheet
2. What does the "%" symbol represent in G-code?
A) Percentage of feed rate
B) Start of G-code program
C) Comment marker
D) Tool change indicator
Correct Answer: B
, MET 320L Lab Assignment 1.3 – Introduction
to Manual G-Code | 2D CNC Cutting Machines,
G90/G91, G92, G54-G59, G00 & G01 |
Complete Lab | 2026/2027 update - ECPI
University
SECTION 1: G-CODE FUNDAMENTALS & PROGRAM
STRUCTURE (Questions 1–10)
1. What does the letter "O" represent at the beginning of a CNC
program?
A) Operator number
B) Program number
C) Origin offset
D) Output speed
Correct Answer: B
Rationale: The "O" address is used for the program number, which
identifies the program and must be at the top of the program. Program
numbers can range from 00001 to 09999, though the total number of
programs is limited by the machine's memory .
Source: Machinist 2nd Year Trade Theory; G-Code Reference Sheet
2. What does the "%" symbol represent in G-code?
A) Percentage of feed rate
B) Start of G-code program
C) Comment marker
D) Tool change indicator
Correct Answer: B
