Ogee Offsets

Question 1

What is the math formula for the net Wrapper length of an ogee Offset?

Answer 1

____________
4 ,/’ ( O² + L²) - L
—————————-
3

Question 2

What are two types of straight-line offsets?

Answer 2

1. Mitered

2. Angled

Question 3

An ogee curve is a combination of ________ and ________ curves forming one smooth curve.

Answer 3

Convex

Concave

Question 4

A riser and an offset are two different methods of development.

A. True
B. False

Answer 4

B. False

They only differ in orientation.

Question 5

To build an offset, you must know:

A. The duct sizes.
B. The cheek size.
C. The amount of offset.
D. The length of fitting.
E. All of the above.

Answer 5

E. All of the above.

Question 6

The centerline is divided into ____________ equal parts.

Answer 6

4

Question 7

There is a way to tell exactly where the convex and concave curve meet.

A. True
B. False

Answer 7

B. False

The line that goes through swing points and through the centerline is where the curves should meet.

Question 8

The three methods used to determine Wrapper length are:

Answer 8

1. Pattern development.
2. Measurement.
3. Calculation.

Question 9

Instead of guessing where to change direction of the roll on a Wrapper, you can calculate the point.

A. True.
B. False.

Answer 9

B. False.

You must measure the distance along the pattern.

Question 10

The most accurate way to determine Wrapper length in pattern development is to measure it.

A. True
B. False

Answer 10

B. False.

It is difficult to align your tape on paper.

Question 11

The method of development for a change offset is completely different than for a simple offset.

A. True
B. False

Answer 11

B. False

The methods are the same.

Question 12

To divide the large opening up for your centerlines, you would:

A. Divide the large opening in half.
B. Divide the large opening into thirds.
C. Divide the large opening into quarters.
D. Use the distance from the small opening.

Answer 12

D. Use the distance from the small opening.

Question 13

If the left Wrapper length comes from the left centerline, the right Wrapper length must come from the right centerline.

A. True
B. False

Answer 13

A. True

Question 14

You should lay out inside patterns whenever possible.

A.True
B. False

Answer 14

A. True

Question 15

All shops use the same allowances for an offset fitting.

A. True
B. False

Answer 15

B. False

Different shops may use different allowances.

Question 16

You need a detailed pattern to calculate cut size.

A. True
B. False

Answer 16

B. False

A simple sketch will do in most cases.