The conditions under which reamers are used and the results which are desired vary so widely that it is impossible to set up any guide to cover each possible combination. A few of the variables which affect reamer cutting action are:
| 1. | Speed |
| 2. | Feed |
| 3. | Use of guide bushings |
| 4. | Material |
| 5. | Condition of machine |
| 6. | Rigidity of set-up |
| 7. | Rake of cutting edges |
| 8. | Reliefs on reamer |
| 9. | Amount of stock to be removed |
| 10. | Finish required |
| 11. | Tolerance of hole |
