Mechanical Engineering - Workshop Technology - Discussion

The Correct answer is D.

Thread rolling is used to produce threads in substantial quantities. This is a cold-forming process.

Operation in which the threads are formed by rolling a thread blank between hardened dies that cause.

The metal to flow radially into the desired shape. Because no metal is removed in the form of chips, less.

Material is required, resulting in substantial savings. In addition, because of cold working, the threads.

Have greater strength than cut threads, and a smoother, harder, and more wear-resistant surface is obtained.

One obvious characteristic of a rolled thread is that its major diameter always is greater than the diameter of the blank. When an accurate class of fit is desired, the diameter of the blank is made about 0.002 inch larger than the thread pitch diameter. If it is desired to have the body of a bolt larger than the outside diameter of the rolled thread, the blank for the thread is made smaller than the body.

Hello, guys the answer C is correct.
In thread rolling, there is two pitch (major pitch and minor pitch).
Blank diameter is always calculated by the maximum value so the major pitch is the right answer.
There is a very small difference between minor pitch and major pitch.
So the correct answer is little larger than minor dia of the thread.
Below are the details about the above.

Major pitch and minor pitch.

Blank diameter is always calculated by the maximum value so the major pitch is the right answer.

There is a very small difference between minor pitch and major pitch.

So, the correct answer is little larger than the minor diameter of the thread.

Correct answer c.

The blank diameter is the diameter of the part onto which the threads will be rolled. This diameter is typically equal to MAX thread pitch diameter less. 002 inches [or. 051 MM].

Blank diameter is little larger than the minor diameter of the thread.

The blank diameter is the diameter of the part onto which the threads will be rolled. This diameter is typically equal to MAX thread pitch diameter less .002 inches [or .051 MM]. So blank diameter is a little larger than the minor diameter of the thread.

Option - C is correct.

Because Blank dia of rolled thread= (Maximum pitch diameter - 0.002 inch).

@Vinit.

0.002 inch not "larger than" the thread pitch diameter, actually it would be 0.002 inches "less than" the thread pitch diameter.

The correct answer is B because there will be no chip formation. Hence, while doing thread rolling it generates the major as well as minor diameter of the thread.

The blank diameter of a rolled thread is at the pitch diameter, a theoretical point between the major diameter and minor diameter. So, the correct answer is B.

Option D is correct, thread rolling is done in which blank dia is approximately equal to pitch dia of thread required.

Option d is correct. You can imagine gear nominal dia greter than pitch diameter (imagination dia).