Table Of Change Wheels Foe Screw-Cutting
Description
This section is from the book "The English And American Mechanic", by B. Frank Van Cleve. Also available from Amazon: The English And American Mechanic.
Table Of Change Wheels Foe Screw-Cutting
The leading Screw being ½ inch pilch, or containing 2 threads in an inch.
Number of teeth in | ||
Number of threads in inch of screw. | Lathe spindle-wheel. | Leading screw-wheel. |
1 | 80 | 40 |
1¼ | 80 | 50 |
1½ | 80 | 60 |
1¾ | 80 | 70 |
2 | 80 | 90 |
2¼ | 80 | 90 |
2 | 80 | 100 |
2¾ | 80 | 110 |
3 | 80 | 120 |
3¼ | 80 | 130 |
3½ | 80 | 140 |
3¾ | 40 | 150 |
4 | 40 | 80 |
4¼ | 40 | 85 |
4½ | 40 | 90 |
4¾ | 40 | 95 |
5 | 40 | 100 |
5½ | 40 | 110 |
6 | 40 | 120 |
6½ | 40 | 130 |
7 | 40 | 140 |
7½ | 40 | 150 |
8 | 30 | 210 |
Number of threads in inch of screw. | Number of teeth in | |||
Lathe spindle-wheel. | Wheel in contact with spindle wheel. | Pinion in contact with screw-wheel. | Leading screw-wheel. | |
8¼ | 40 | 55 | 20 | 60 |
8½ | 90 | 85 | 20 | 90 |
8¾ | 60 | 70 | 20 | 75 |
9½ | 90 | 90 | 20 | 95 |
9¾ | 40 | 60 | 20 | 65 |
10 | 60 | 75 | 20 | 80 |
10½ | 50 | 70 | 20 | 75 |
11 | 60 | 55 | 20 | 120 |
12 | 90 | 90 | 20 | 120 |
12¾ | 60 | 85 | 20 | 90 |
13 | 90 | 90 | 20 | 130 |
13½ | 60 | 90 | 20 | 90 |
13¾ | 80 | 100 | 20 | 110 |
14 | 90 | 90 | 20 | 140 |
14¼ | 60 | 90 | 20 | 95 |
15 | 90 | 90 | 20 | 150 |
16 | 60 | 80 | 20 | 120 |
16¼ | 80 | 100 | 20 | 130 |
16½ | 80 | 110 | 20 | 120 |
17 | 45 | 85 | 20 | 90 |
17½ | 80 | 100 | 20 | 140 |
18 | 40 | 60 | 20 | 120 |
18¾ | 80 | 100 | 20 | 150 |
Number of threads in Inch of screw. | Number of teeth In | |||
Lathe spindle-wheel. | Wheel in contact with spindle - wheel. | Pinion in contact with screw-wheel. | Leading screw-wheel. | |
19 | 50 | 95 | 20 | 100 |
19½ | 80 | 120 | 20 | 130 |
20 | 60 | 100 | 20 | 120 |
20¼ | 40 | 90 | 20 | 90 |
21 | 80 | 120 | 20 | 140 |
22 | 60 | 110 | 20 | 120 |
22½ | 80 | 120 | 20 | 150 |
22¾ | 80 | 130 | 20 | 140 |
28¾ | 40 | 95 | 20 | 100 |
24 | 65 | 120 | 20 | 130 |
25 | 60 | 100 | 20 | 150 |
25½ | 30 | 85 | 20 | 90 |
28 | 70 | 130 | 20 | 140 |
27 | 40 | 90 | 20 | 120 |
27½ | 40 | 100 | 20 | 110 |
28 | 75 | 140 | 20 | 150 |
28½ | 30 | 90 | 20 | 95 |
30 | 70 | 140 | 20 | 150 |
32 | 30 | 80 | 20 | 120 |
33 | 40 | 110 | 20 | 120 |
34 | 30 | 85 | 20 | 120 |
35 | 60 | 140 | 20 | 150 |
36 | 30 | 190 | 20 | 120 |
Example 1
Required the number of teeth that a wheel of 16 inches diameter will contain of a 10 pitch.
16 X 10 = 160 teeth, and the circular pitch = .314 inch.
Example 2
What must be the diameter of a wheel for a 9 pitch of 126 teeth ?
126 / 9 = 14 inches diameter, circular pitch .349 inch. Note. - The pitch is reckoned on the diameter of the wheel instead of the circumference, and designated wheels of 8 pitch, 12 pitch, etc.
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