How fast does it drill? How long will bits last?
Speed and bit life depend on several factors, including the type of aggregate, age of the concrete, type and sharpness of the bit and the amount of steel or rebar in the concrete. Generally, you can expect to drill between 150 and 250 holes with each bit. The chart below shows the drilling times achieved with an E-Z Drill 210B SRA system equipped with a Chicago Pneumatic 32 rock drill.
| Bit Diameter | Drill Depth | Time (seconds) | Location |
|---|---|---|---|
| 5/8 in. (15.9 mm) | 16 in. (40.6 mm) | 18–20 | Texas |
| 3/4 in. (19.1 mm) | 12 in. (30.5 mm) | 25–28 | Texas |
| 3/4 in. (19.1 mm) | 6 in. (15.2 mm) | 15 | Michigan |
| 7/8 in. (22.2 mm) | 9 in. (22.9 mm) | 15 | Texas |
| 1 in. (25.4 mm) | 9 in. (22.9 mm) | 18-20 | Florida |
| 1 1/8 in. (28.6 mm) | 10 in. (25.4 mm) | 21–23 | Oklahoma |
| 1 1/4 in. (31.8 mm) | 9 1/2 in. (24.1 mm) | 30-33 | Pennsylvania |
| 1 3/8 in. (34.9 mm) | 9 1/2 in. (24.1 mm) | 21-24 | Pennsylvania |
| 1 3/8 in. (34.9 mm) | 10 in. (25.4 mm) | 24-26 | Arkansas |
| 1 3/8 in. (34.9 mm) | 10 in. (25.4 mm) | 18-20 | Kansas |
| 1 3/8 in. (34.9 mm) | 10 in. (25.4 mm) | 26 | California |
| 1 3/8 in. (34.9 mm) | 10 in. (25.4 mm) | 20-22 | Indiana |
| 1 1/2 in. (38.1 mm) | 9 in. (22.9 mm) | 28-20 | Illinois |
| 1 5/8 in. (41.3 mm) | 15 in. (38.1 mm) | 48-52 | Georgia |
| 1 5/8 in. (41.3 mm) | 9 in. (22.9 mm) | 24-26 | Oklahoma |
| 1 3/4 in. (44.5 mm) | 10 in. (25.4 mm) | 33-35 | Arizona |
