Dividing Head

Question 1

PRACTICE THE CALCULATIONS

Answer 1

In week 12 on learning hub

Question 2

What is a dividing head used for?

Answer 2

used to divide a circle (usually) into an
equal number of divisions

Question 3

What are the 3 ways a dividing head can be set up?

Answer 3

with faceplate, dead center, or 3 jaw chuck

Question 4

How many teeth does a worm wheel have?

Answer 4

40

Question 5

_________ Indexing is done with the worm gear engaged.
_________ Indexing is done with the worm gear disengaged.

Answer 5

Simple Indexing is done with the worm gear engaged.
Direct Indexing is done with the worm gear disengaged.

Question 6

_________ indexing plate usually contains _______ sets of hole circles or slots. Which are: _______________

Answer 6

Direct indexing plate usually contains three sets of hole
circles or slots: 24,30, and 36

Question 7

Should you count the hole or slot in which the index pin is engaged?

Answer 7

NEVER count the hole or slot in which the index pin is engaged.

Question 8

What is the gear reduction for simple indexing?

Answer 8

(40 teeth) means a 40:1 gear reduction (it takes 40 turns of the crank to get one full revolution of the output spindle)

Question 9

What is the formula for simple indexing?

Answer 9

Indexing=40/N

N= Number of sides/holes

Example: To machine 8 sides of a blank, N = 8, so 40/8 = 5 turns of the crank to index the blank before each cut.

Question 10

What can you use if the numbers don’t divide nicely for simple indexing?

Answer 10

Use an Index Plate and Sector Arms

Question 11

_______ Indexing is the simplest form of indexing.

Answer 11

Direct