8/8/2019 51 Sheet Metal Engineering

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SHEETMETAL

ENGINEERING

Answer the questions below to help the Manager solve this problem:

1. What is the area of the whole sheet?

2. What is the area of one hole?

3. How many holes are on a complete sheet?

4. How far apart do the holes need to be for a square grid?

5. How far apart do the holes need to be for a triangular grid?

The Manager of “Trevaskis Engineering Pty Ltd” pondered the problem

that his most recent customer had given him. “I need a 50%

perforated rectangular sheet (900 x 600) of metal with 10mm holes”.

He thought: “What spacing should I have between the circles so that

there is exactly 50% metal and 50% holes? Should the centre of the

holes be in a square or triangular grid?”

“I’ve changed my mind” the customer said. “I want a perforated sheet

with 16mm holes”. What hole centres are needed now for a 50% open

perforated sheet?