Precision Machining Technology
3rd Edition
ISBN: 9781337795302
Author: Peter, Hoffman.
Publisher: Cengage Learning,
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Textbook Question
Chapter 8.3, Problem 7RQ
If a G1 code command is programmed partway through a machining operation, but no F-value is given in that block, what feed rate will be used?
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While constructing a building, an engineer need to fix two steel beams together using a bracket as shown in
Figure 1. Using absolute coordinate system, construct a G-code program for drilling hole number 2 only. To
remove the metal chips the hole should be done in two equal steps. During the drilling, coolant should be on
after spindle starts and stop before spindle stops. The spindle speed set to 1750 RPM. Drilling bit in rack
number 2 and it should be 2 mm over the work piece. Drilling feed rate is 25 mm/min.
Explain each code used in the program in a column.
57.5-
12.5
Hole (4)
Hole (3)
30
10
Hole (2)
Hole (1)
X0 YO ZO
10
15
All dimensions shown are in mm
Figure 1
Make the part program using CNC code. Tool Dia. = 6 mm depth of cut 3.0 mm (Use G90 code)
(follow the points as marked Start point, P1, P2, P3, P4, P5, P6) (don't use G41, G42)
6. Write one block of code to perform the indicated operation. Assume the location
is X2.0, Y2.0, and the depth is Z-1.5 for each operation.
1) Drill with dwell of 0.2 seconds
2) Peck drilling cycle with a 0.15" peck depth
3) Chip breaker with a 0.15" peck and full retract every 0.6"
4) RH tapping cycle for 14-16 NC thread; define a spindle speed and feed
5) Bore a hole with the tool being retracted manually
Chapter 8 Solutions
Precision Machining Technology
Ch. 8.1 - What is an ATC?Ch. 8.1 - What is an MCU and what is its function?Ch. 8.1 - Briefly describe a ball screw and a linear guide.Ch. 8.1 - Explain the benefits of using the absolute...Ch. 8.1 - Explain the benefits of using the incremental...Ch. 8.1 - Which coordinate system uses an angle and a...Ch. 8.1 - What is the name for the type of motor used to...Ch. 8.1 - Supposing a programmer, using absolute mode,...Ch. 8.1 - What is a modal code?Ch. 8.1 - What is another name for the Cartesian coordinate...
Ch. 8.1 - List four G-codes and describe their functions. a....Ch. 8.1 - List four M-codes and describe their functions. a....Ch. 8.1 - What is the name of the character that ends each...Ch. 8.1 - Explain the purpose of the safe-start portion of a...Ch. 8.2 - Name the two primary machine axes on most CNC...Ch. 8.2 - Explain the difference between a turning center...Ch. 8.2 - List the three common types of live toolholders....Ch. 8.2 - Name three major collet styles used in...Ch. 8.2 - Name three types of workholding devices for...Ch. 8.2 - Name three major styles of turning machines....Ch. 8.2 - Explain why some workholding devices can be run at...Ch. 8.2 - Explain the difference between an OD grooving tool...Ch. 8.2 - When machining workpieces made from bar stock,...Ch. 8.2 - Describe how a sub-spindle can be used to increase...Ch. 8.2 - How does a Swiss turning center differ from a...Ch. 8.3 - Write the X- and Z-axis coordinates for the part...Ch. 8.3 - To perform a facing cut using a tool with a nose...Ch. 8.3 - Explain the difference between rigid tapping and...Ch. 8.3 - How must the feed rate for tapping using a...Ch. 8.3 - Describe what happens to a concave radius (fillet)...Ch. 8.3 - Describe what happens to an outside chamfer when...Ch. 8.3 - If a G1 code command is programmed partway through...Ch. 8.3 - List and briefly describe the two methods for...Ch. 8.3 - Explain in your own words the difference between...Ch. 8.3 - In your own words, describe a canned cycle.Ch. 8.3 - List two types of canned cycles besides roughing...Ch. 8.4 - What machine mode is generally used to manually...Ch. 8.4 - MDI stands for _________ ___________ ________.Ch. 8.4 - Which must be set first, the tool geometry offset...Ch. 8.4 - What is the process called where a program is sent...Ch. 8.4 - Explain the purpose of homing.Ch. 8.4 - What is the process called when a new program is...Ch. 8.4 - When setting up a machine to run a program that...Ch. 8.4 - What does MCS stand for?Ch. 8.4 - What is used to adjust the clamping pressure of...Ch. 8.4 - What does MCS stand for?Ch. 8.4 - What does WCS stand for?Ch. 8.4 - A workpiece offset is the distance from __________...Ch. 8.5 - Explain the difference between a machining center...Ch. 8.5 - Name the two major types of ATCs and briefly...Ch. 8.5 - What are the two basic types of tapping...Ch. 8.5 - What are the three most common styles of collets...Ch. 8.5 - What are the two basic types of tapping...Ch. 8.5 - Prob. 6RQCh. 8.5 - A programmable indexing fixture creates a fourth...Ch. 8.5 - A _______ ________ uses interchangeable tooling...Ch. 8.5 - Briefly describe a tombstone used for CNC...Ch. 8.5 - A custom ______ can be designed and built to hold...Ch. 8.5 - The combination of the machining operations...Ch. 8.6 - What are the three major axes used during CNC mill...Ch. 8.6 - What command would be given to turn on the spindle...Ch. 8.6 - What G-code designates IPM feed rate mode? IPR...Ch. 8.6 - What is the purpose of a clearance plane in CNC...Ch. 8.6 - What is the purpose of work coordinate systems?Ch. 8.6 - Briefly define linear interpolation.Ch. 8.6 - If during the last operation on a part, a G1 code...Ch. 8.6 - Briefly describe the use of I and J for the arc...Ch. 8.6 - Write two blocks of code that could be used to...Ch. 8.6 - Briefly explain the difference between rigid and...Ch. 8.6 - Define the initial plane for a canned drilling or...Ch. 8.6 - A G98 in a canned cycle sets the return point to...Ch. 8.6 - A _____ code is used to cancel a canned cycle.Ch. 8.6 - What two codes are used to activate automatic...Ch. 8.6 - What two codes are used to activate automatic...Ch. 8.6 - What code is used to cancel automatic cutter...Ch. 8.7 - Which must be set first, a work offset or a tool...Ch. 8.7 - What mode is used to manually enter programs into...Ch. 8.7 - What is the process called when a program is sent...Ch. 8.7 - Explain what may occur that makes it necessary to...Ch. 8.7 - Explain the purpose of homing.Ch. 8.7 - What is the process called when a new program is...Ch. 8.7 - What are two actions that can be taken during the...Ch. 8.7 - When automatic cutter radius compensation is used...Ch. 8.7 - Which machine mode allows short, temporary program...Ch. 8.7 - Which machine mode is used to run the machine...Ch. 8.7 - What are the two controls on the machine's control...Ch. 8.7 - What control panel feature can be used to slow a...Ch. 8.8 - Prob. 1RQCh. 8.8 - Prob. 2RQCh. 8.8 - What are the three primary steps in creating a CNC...Ch. 8.8 - Prob. 4RQCh. 8.8 - What is the definition of entity?Ch. 8.8 - Why should a toolpath be verified on the screen of...Ch. 8.8 - What is a post-processor used for?Ch. 8.8 - What is it called when mutiple touching entities...Ch. 8.8 - What type of cutting tool is usually used for...
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- Write a CNC Milling program to machine the outer profile of a 6 mm thick aluminum sheet. Cutting parameters: depth of cut 3 mm, speed 1200 rpm, feed rate 100 mm/min, and coolant. Tool size 8 mm. (you can use the tool cutter compensations codes). Use an absolute coordinate from the point identified as tool position. 10 40 R 10 R 10 40 Tool position 20 z, 10 mm above All units in mm the sheetarrow_forwardWhich of the following commands will move the tool in a diagonal line at a feed rate of 5 from position (10, 20), assuming absolute programming mode is active? Select one: a. N10G00X10F5 b. N10G01X20Y30F5 c. N10G01X10F5 d. N10G00X20Y30F5arrow_forwardQ: Describe G03 used in a CNC milling machine G-code. Include the syntax of both versions and give a detailed example.arrow_forward
- CNC. Please write what each line of G- code means for each line. Thanksarrow_forwardIn the FAPT programming language, the following format of statement Si= ................. is used to define: O Straight line Variable Branch commands Macro Point Circle O Cutting areaarrow_forwardIf during the last operation on a part, a G1 code command is programmed but no F-value is given in the block, what feed rate will be used?arrow_forward
- 1. What is the code used for clockwise circular interpolation, if the tool is mounted in front of the job? (Reg. Number Ending with Even Numbers) 2. What is the comment can be used to specify the dimensions of the job in CNC programming? (Reg. Number Ending with Zero and Odd Numbers)arrow_forwardEX7: write a program read any vector and print the odd order only?arrow_forwardWrite the function of ortho on in an AutoCAD system. When and why we use this command during drawing. Write the steps to use the Trim operation in AutoCAD drawing. Answer both the questionsarrow_forward
- List and briefly describe the two methods for programming circular interpolation.arrow_forwardNUMERICAL METHOD PLEASE FOLLOW THE INSTRUCTIONarrow_forwardA programmable indexing fixture creates a fourth axis called a ________ __________ that is similar to a rotary table used on a manual milling machine.arrow_forward
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