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Estimating thrust, torque, and power requirements
When considering the clamping method and clamping fixture of the workpiece, the thrust and torque generated during drilling must be considered. If you want to make an approximate guess, you can find it from a simple empirical formula. Here is an example of an experimental formula obtained based on accumulated experimental data. The table below shows the coefficients depending on the material. It is also possible to calculate the required power based on the estimated torque.
A: Experimental formula for determining thrust
B: Experimental formula for determining torque
Rt: Thrust (N)
Tr: Torque (N·cm)
P : Power required (kW)
k : Coefficient due to material
m : Coefficient due to workpiece material
DC: Drill diameter (mm)
f : Amount of feed per revolution (mm/rev)
| Workpiece materials | Tensile strength (Mpa) and hardness | k | m | |
| classification | Representative example | |||
| Mild steel | SS400 | 520 | 3.5 | 3.6 |
| Carbon Steel | S50C | 660 | 3.1 | 3.4 |
| Chromium molybdenum steel | SCM440 | 730 | 3.7 | 4.2 |
| 30HRC | 4.0 | 4.2 | ||
| Austenitic stainless steel | SUS304 | 180HB | 5.2 | 5.3 |
| Spheroidgraphitecast iron | FCD600 | 600 | 2.9 | 2.9 |
| Grey cast iron | FC250 | 200HB | 2.8 | 1.8 |
| Light alloy castings | ADC12 | 310 | 0.9 | 0.8 |
Article: Drill Technical Data