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Rotary table - Angular vs. Linear Accuracy

 

The relationship between angles and linear dimensions is defined by trigonometry. Sine, cosine and tangent functions allow to calculate these relationships. Because an angle diverges as distance from the origin increases, so too, increases the tangential component. Therefore, it is not appropriate to specify a rotary tables accuracy in linear values, unless a maximum envelope (diameter) is also specified.

It is not difficult to determine the linear relationships to their respective angles, within a specific envelope. Let's equate 1 arc second (see definition in Glossary) to some common linear measurements. For our discussion, we'll use 0.000004848 as the tangent of 1 arc second. Since the trig functions provide dimensionless ratios, 0.000004848 (usually rounded to (0.000005) applies to any unit of linear measure, just be consistent.

To use the charts below, locate your required linear tolerance, and the maximum radius to be worked, the resulting intersection shows the corresponding nominal index accuracy, in arc seconds (unless specified, i.e., [] = deg.; ['] = min.), required for the application. If your tolerance zone or working radius falls between two values, use the tighter requirement.

Tolerance

Working Radius (Inches)

 

1

2

3

4

5

6

10

12

18

20

24

30

36

40

48

0.010"

10'

8'

6'

5'

3'

2'

2'

1'

1'

1'

30

30

30

0.005"

10'

5'

4'

3'

2'

2'

1'

1'

30

30

30

20

20

15

0.003"

10'

5'

4'

3'

2'

2'

1'

1'

30

30

30

20

20

15

10

0.002"

5'

3'

2'

2'

1'

1'

30

30

30

20

15

10

10

10

10

0.001"

3'

2'

2'

1'

30

30

20

20

15

10

10

10

5

5

5

0.0005"

1'

1'

30

30

20

15

10

10

5

5

5

5

2

2

2

0.0003"

1'

30

20

15

10

10

5

5

5

3

3

3

2

1

1

0.0001"

20

10

5

5

3

3

2

2

1

1

1

0.5

0.5

0.2

0.2

0.00005"

10

5

2

2

2

1

1

1

0.5

0.5

0.5

0.2

0.2

0.2

0.1

0.00001"

2

1

1

0.5

0.2

0.2

0.2

0.1

0.1

0.1

*

*

*

*

*

Table 1 [inch values]

 

Tolerance

Working Radius (Millimeters)

 

25

50

75

100

125

150

200

250

375

500

750

1000

1500

0.25 mm

10'

8'

6'

5'

4'

3'

2'

1'

1'

30

30

0.1 mm

10'

5'

4'

3'

2'

2'

1'

1'

30

30

15

15

10

0.05 mm

5'

3'

2'

1'

1'

1'

30

30

20

15

10

10

5

0.025 mm

2'

1'

1'

30

30

30

15

15

10

5

5

5

3

0.01 mm

1'

30

20

15

10

10

10

5

5

3

3

1

1

0.005mm

30

15

10

10

5

5

5

3

3

2

1

1

0.5

0.0025 mm

15

10

5

5

3

3

2

2

1

1

0.5

0.5

0.2

1 m

5

3

2

1

1

1

0.5

0.5

0.5

0.2

0.1

0.1

0.1

0.5 m

2

1

1

0.5

0.5

0.5

0.2

0.2

0.2

0.1

*

*

*

Table 2 [metric values]

 

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