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PES Skill Sheets.book - Capital High School

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4. Two examples:<br />

<strong>Skill</strong> Sheet 7.1: Gear Ratios<br />

1. 9 turns<br />

7. Answers for the table are:<br />

2. 1 turn<br />

Table 2: Setup for three gears<br />

3. 4 turns<br />

Set Gears Number Ratio 1 Ratio 2<br />

4. 10 turns<br />

5. 6 turns<br />

6. Answers for the table are:<br />

Table 1: Using the gear ratio to calculate number of turns<br />

up<br />

1 Top gear<br />

of<br />

teeth<br />

12<br />

(top gear:<br />

middle<br />

gear)<br />

(middle<br />

gear: bottom<br />

gear)<br />

Input<br />

Gear<br />

(# of teeth)<br />

Output<br />

Gear<br />

(# of teeth)<br />

Gear<br />

ratio<br />

(Input Gear:<br />

Output Gear)<br />

How many<br />

turns does<br />

the output<br />

gear make if<br />

the input<br />

gear turns 3<br />

times?<br />

How many<br />

turns does the<br />

input gear<br />

make if the<br />

output gear<br />

turns 2 times?<br />

2<br />

Middle<br />

gear<br />

Bottom<br />

gear<br />

Top gear<br />

24<br />

36<br />

24<br />

1<br />

--<br />

2<br />

2<br />

--<br />

3<br />

24<br />

36<br />

24<br />

12<br />

1<br />

3<br />

3<br />

9<br />

2<br />

0.67, or 2/3<br />

of a turn<br />

Middle<br />

gear<br />

Bottom<br />

36<br />

12<br />

2<br />

--<br />

3<br />

3<br />

--<br />

1<br />

24 36 0.67, or 2/3 2 3<br />

gear<br />

48 36 1.33, or 4/3 4 1.5<br />

3 Top gear 12<br />

24 48 0.5, or 1/2 1.5 4<br />

Middle<br />

gear<br />

Bottom<br />

gear<br />

48<br />

24<br />

1<br />

--<br />

4<br />

4<br />

--<br />

2<br />

4 Top gear 24<br />

Middle<br />

gear<br />

Bottom<br />

gear<br />

48<br />

36<br />

1<br />

--<br />

2<br />

4<br />

--<br />

3<br />

Page 21 of 57<br />

Total gear ratio<br />

(Ratio 1 × Ratio 2)<br />

1<br />

--<br />

3<br />

2<br />

--<br />

1<br />

1<br />

--<br />

2<br />

2<br />

--<br />

3

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