In the following table is given the sizes of cutters as made by one company, the bores being 1 inch.
| Width of face. | Diameter of cutter. | Width of face. | Diameter of cutter. | ||||||||
| inch. | inch. | inch. | inch. | inch. | inch. | inch. | inch. | ||||
| 1⁄8 | 2 | 1⁄2 | 3 | 4 | 15⁄16 | 2 | 1⁄2 | 3 | 4 | ||
| 3⁄16 | 2 | 1⁄2 | 3 | 4 | 1 | 2 | 1⁄2 | 3 | 4 | ||
| 1⁄4 | 2 | 1⁄2 | 3 | 4 | 1 | 1⁄8 | 2 | 1⁄2 | 3 | 4 | |
| 5⁄16 | 2 | 1⁄2 | 3 | 4 | 1 | 1⁄4 | 2 | 1⁄2 | 3 | 4 | |
| 3⁄8 | 2 | 1⁄2 | 3 | 4 | 1 | 1⁄2 | 2 | 1⁄2 | 3 | 4 | |
| 7⁄16 | 2 | 1⁄2 | 3 | 4 | 1 | 3⁄4 | 2 | 1⁄2 | 3 | 4 | |
| 1⁄2 | 2 | 1⁄2 | 3 | 4 | 2 | 2 | 1⁄2 | 3 | 4 | ||
| 9⁄16 | 2 | 1⁄2 | 3 | 4 | 2 | 1⁄4 | 2 | 1⁄2 | 3 | 4 | |
| 5⁄8 | 2 | 1⁄2 | 3 | 4 | 2 | 1⁄2 | 2 | 1⁄2 | 3 | 4 | |
| 11⁄16 | 2 | 1⁄2 | 3 | 4 | 3 | 2 | 1⁄2 | 3 | 4 | ||
| 3⁄4 | 2 | 1⁄2 | 3 | 4 | 3 | 1⁄2 | 2 | 1⁄2 | 3 | 4 | |
| 13⁄16 | 2 | 1⁄2 | 3 | 4 | 4 | 2 | 1⁄2 | 3 | 4 | ||
| 7⁄8 | 2 | 1⁄2 | 3 | 4 | |||||||
The keyways are semicircular, the key being composed of a piece of No. 25 Stubbs steel wire.
The following is a table of the sizes of milling cutters made by another company.
| Width of face. | Diameter of cutter. | Size of hole. | Width of face. | Diameter of cutter. | Size of hole. | ||||
| inch. | inch. | inch. | inch. | inch. | inch. | ||||
| 1⁄8 | 2 | 1⁄4 | 1 | 3⁄4 | 2 | 7⁄8 | 1 | ||
| 3⁄16 | 2 | 1⁄4 | 1 | 7⁄8 | 2 | 7⁄8 | 1 | ||
| 1⁄4 | 2 | 1⁄2 | 1 | 1 | 2 | 1⁄2 | 1 | ||
| 5⁄16 | 2 | 1⁄2 | 1 | 1 | 1⁄4 | 2 | 1⁄2 | 1 | |
| 3⁄8 | 2 | 5⁄8 | 1 | 1 | 1⁄2 | 2 | 1⁄2 | 1 | |
| 7⁄16 | 2 | 5⁄8 | 1 | 1 | 3⁄4 | 2 | 1⁄2 | 1 | |
| 1⁄2 | 2 | 3⁄4 | 1 | 2 | 2 | 1⁄2 | 1 | ||
| 9⁄16 | 2 | 3⁄4 | 1 | 2 | 1⁄2 | 2 | 1⁄2 | 1 | |
| 5⁄8 | 2 | 3⁄4 | 1 | 3 | 2 | 1⁄2 | 1 | ||
| 11⁄16 | 2 | 7⁄8 | 1 | ||||||
Cutters of 1 inch face and over have teeth of a spiral form.
The object of providing spiral teeth is to maintain a uniformity of cutting duty at each instant of time.
Fig. 1911.