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RPM table for diamond drill bits (Γ32βΓ300 mm)
When working in professional core drilling, one of the most frequently asked questions is:
How many RPM should a diamond drill bit make based on its diameter?
In fact, the answer depends on the correct peripheral speed , which varies according to the material.
In this table we use the following parameters:
-
Cement β 2.0β3.0 m/s
-
Reinforced concrete β 1.2β1.8 m/s
Formula used
RPM = Ο β D V β 60
Where:
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V = peripheral speed (m/s)
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D = diameter in meters
Complete RPM table for drill bits
| Γ Drill bit | Reinforced concrete 1.2β1.8 m/s | Cement 2.0β3.0 m/s |
|---|---|---|
| 32 mm | 720 β 1,070 RPM | 1,190 β 1,790 RPM |
| 42 mm | 550 β 820 RPM | 910 β 1,370 RPM |
| 52 mm | 440 β 660 RPM | 730 β 1,100 RPM |
| 62 mm | 370 β 550 RPM | 620 β 930 RPM |
| 72 mm | 320 β 480 RPM | 530 β 800 RPM |
| 82 mm | 280 β 420 RPM | 470 β 700 RPM |
| 100 mm | 230 β 340 RPM | 380 β 570 RPM |
| 120 mm | 190 β 290 RPM | 320 β 480 RPM |
| 150 mm | 150 β 230 RPM | 250 β 380 RPM |
| 180 mm | 130 β 190 RPM | 210 β 320 RPM |
| 200 mm | 115 β 170 RPM | 190 β 290 RPM |
| 250 mm | 90 β 140 RPM | 150 β 230 RPM |
| 300 mm | 80 β 115 RPM | 130 β 190 RPM |
How to read the table correctly
To use it on the construction site:
- First, find the diameter of the drill bit
- Secondly, identify the main material
- Always start from the lowest value in the range
- Finally, it increases only if the hole is stable and cooled properly
Important note
If you work:
-
dry β stays in the lower part of the range
-
with very thick armor β favors conservative values
-
with a powerful core drill β it doesn't mean you can increase the RPM
In fact, in coring, stability is more important than speed.
Quick examples
-
Γ82 mm on reinforced concrete β approx. 300β400 RPM
-
Γ150 mm on concrete β approx. 250β350 RPM
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Γ200 mm on reinforced concrete β approx. 120β160 RPM
