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Drilling Speeds
The rpms that you set your drilling
machine at can be calculated from the following formulae and
table of cutting speeds. Rev/min = ( Metres/min X 1000 ) / ( 3.142 X
D )
where D = Diameter of the Drill
and Metres/min is acquired from the table
below.
| MATERIAL | SPEED (Metres/min) |
| Aluminium & aluminium alloys | 30 to 61 |
| Brass | 30 to 46 |
| Leaded brass | 30 to 61 |
| Bronze | 30 to 61 |
| High tensile bronze | 21 to 30 |
| Grey cast iron | 24 to 30 |
| Copper | 30 to 46 |
| Monel metal | 6 to 15 |
| Free cutting mild steel | 24 to 30 |
| High tensile steel | 15 to 21 |