Question

Which of the following is NOT an indexing method used in milling machines?

• A. Direct indexing
• B. Compound indexing
• C. Differential indexing
• D. Integral indexing

Hint:

To remember the valid ones, think of D.S.C.D.: Direct, Simple, Compound, and Differential. If you see a term like "Integral" or "Fractional" used as a primary category name, it is almost certainly the wrong answer.

Answer 1

The Correct Option is D

1. Established Indexing Methods: There are several standardized methods used depending on the complexity and number of divisions required:

• Direct Indexing: Also known as rapid indexing, this utilizes an indexing plate attached directly to the spindle. It is used for a small, fixed number of divisions (like 2, 3, 4, 6, 8, 12, and 24).

• Simple/Plain Indexing: This method uses a worm and worm wheel mechanism (usually with a 40:1 ratio) and an index plate with various circles of holes.

• Compound Indexing: This is used when simple indexing cannot achieve the required divisions. It involves two separate indexing operations to obtain the final fractional movement.

• Differential Indexing: This is the most advanced manual method. It uses a gear train to rotate the index plate itself while the crank is being turned, allowing for almost any number of divisions, including prime numbers.

2. Identifying the Incorrect Term: While "Direct," "Compound," and "Differential" are all standard technical terms for milling operations,

Integral indexing is not a recognized method in machine tool engineering. It is likely a distractor term meant to sound technical.