Civil Engineering (CE) Exam > Civil Engineering (CE) Questions > What is the point angle of a twist drill for ...
Start Learning for Free
What is the point angle of a twist drill for general purpose work?
- a)108°
- b)118°
- c)120°
- d)181°
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
What is the point angle of a twist drill for general purpose work?a)10...
Point Angle of a Twist Drill for General Purpose Work
Twist drills are commonly used in various machining operations, including drilling holes in different materials. The point angle of a twist drill is an important parameter that determines the efficiency and effectiveness of the drilling process.
Correct Answer: 118°
Explanation:
- The point angle of a twist drill for general purpose work is typically 118°.
- This angle is considered to be a standard point angle for most drilling applications.
- A 118° point angle is versatile and can be used for drilling a wide range of materials, including metals, plastics, and wood.
- It provides a good balance between cutting efficiency and strength, making it suitable for general drilling tasks.
- Using the correct point angle helps in achieving accurate and precise holes while reducing the chances of drill breakage or damage to the workpiece.
- While other point angles like 108° or 120° can also be used for specific applications, a 118° point angle is widely accepted for general purpose work in various industries.
In conclusion, the point angle of 118° is commonly used for general purpose work with twist drills due to its versatility and effectiveness in drilling different materials.
Twist drills are commonly used in various machining operations, including drilling holes in different materials. The point angle of a twist drill is an important parameter that determines the efficiency and effectiveness of the drilling process.
Correct Answer: 118°
Explanation:
- The point angle of a twist drill for general purpose work is typically 118°.
- This angle is considered to be a standard point angle for most drilling applications.
- A 118° point angle is versatile and can be used for drilling a wide range of materials, including metals, plastics, and wood.
- It provides a good balance between cutting efficiency and strength, making it suitable for general drilling tasks.
- Using the correct point angle helps in achieving accurate and precise holes while reducing the chances of drill breakage or damage to the workpiece.
- While other point angles like 108° or 120° can also be used for specific applications, a 118° point angle is widely accepted for general purpose work in various industries.
In conclusion, the point angle of 118° is commonly used for general purpose work with twist drills due to its versatility and effectiveness in drilling different materials.
Free Test
FREE
| Start Free Test |
Community Answer
What is the point angle of a twist drill for general purpose work?a)10...
Drilling:
- Drilling is a cutting process in which a hole is originated by means of a multi-point, fluted, end-cutting tool.
- As the drill is rotated and advanced into the workpiece, the material is removed in the form of chips that move along the fluted shank of the twist drill.
Important angles of a drill:
Chisel edge angle:
Chisel edge angle:
- The obtuse angle included between the chisel edge and the lip as viewed from the end of the drill.
- The usual value of this angle varies from 120º to 135º.
Rake Angle or Helix Angle:
- It is the angle formed between the plane containing the drill axis and the lead edge of the land.
- It can be zero, positive or negative.
- Higher values are suitable for softer materials and lower values for harder materials.
- If the flute is straight, parallel to the drill axis then there would be no rake. if the flute is right handed then it is a positive rake, and if it is left-handed then the rake is negative.
- The usual value of rake angle is 30º although it may vary up to 45º for different materials.
- The smaller the rake angle, the greater will be the torque required to drive the drill at a given feed.
Point Angle:
- It is known as cutting angle.
- It is the angle included between the two opposite lips of a drill measured in a plane containing the axis of the drill and both lips.
- Smaller point angles are used for ductile materials and larger point angle for brittle materials.
- The point angle of a twist drill for general purpose work is 118°
Clearance angle:
- The angle formed between the flank and a plane normal to the drill axis, measured at the periphery of the drill.
- The angle is measured on the back side of the cutting edge.
- Lip clearance is the relief ground to the cutting edges to allow the drill to enter the metal without interference.
- The lip clearance angle should increase towards the center of the drill than at the circumference.
- This is because different points on the drill cutting edge follow different helical paths.
- Any point on the cutting edge at the circumference moves through a smaller helical angle than a point on the cutting edge near the center.
- This happens to be such due to the lead of the helix being the same in each case and hence the clearance angle given to the drill cutting edge should increase towards the center.
- The clearance angle is 12º in most cases. The clearance angle should be minimum to add rigidity and strength to the cutting edge.
|
Explore Courses for Civil Engineering (CE) exam
|
|
Top Courses for Civil Engineering (CE)View all
Question Description
What is the point angle of a twist drill for general purpose work?a)108°b)118°c)120°d)181°Correct answer is option 'B'. Can you explain this answer? for Civil Engineering (CE) 2025 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about What is the point angle of a twist drill for general purpose work?a)108°b)118°c)120°d)181°Correct answer is option 'B'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for What is the point angle of a twist drill for general purpose work?a)108°b)118°c)120°d)181°Correct answer is option 'B'. Can you explain this answer?.
What is the point angle of a twist drill for general purpose work?a)108°b)118°c)120°d)181°Correct answer is option 'B'. Can you explain this answer? for Civil Engineering (CE) 2025 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about What is the point angle of a twist drill for general purpose work?a)108°b)118°c)120°d)181°Correct answer is option 'B'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for What is the point angle of a twist drill for general purpose work?a)108°b)118°c)120°d)181°Correct answer is option 'B'. Can you explain this answer?.
Solutions for What is the point angle of a twist drill for general purpose work?a)108°b)118°c)120°d)181°Correct answer is option 'B'. Can you explain this answer? in English & in Hindi are available as part of our courses for Civil Engineering (CE).
Download more important topics, notes, lectures and mock test series for Civil Engineering (CE) Exam by signing up for free.
Here you can find the meaning of What is the point angle of a twist drill for general purpose work?a)108°b)118°c)120°d)181°Correct answer is option 'B'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of
What is the point angle of a twist drill for general purpose work?a)108°b)118°c)120°d)181°Correct answer is option 'B'. Can you explain this answer?, a detailed solution for What is the point angle of a twist drill for general purpose work?a)108°b)118°c)120°d)181°Correct answer is option 'B'. Can you explain this answer? has been provided alongside types of What is the point angle of a twist drill for general purpose work?a)108°b)118°c)120°d)181°Correct answer is option 'B'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice What is the point angle of a twist drill for general purpose work?a)108°b)118°c)120°d)181°Correct answer is option 'B'. Can you explain this answer? tests, examples and also practice Civil Engineering (CE) tests.
|
|
Explore Courses for Civil Engineering (CE) exam
|
|
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
|
© EduRev
|
Education Revolution
|
|
Signup on EduRev and stay on top of your study goals
10M+ students crushing their study goals daily