When core drilling job is required, wet core bit is always the best option. You may ask why?
That’s because the wet core bit has the following features:
- Fast drilling speed
- Flushing out of cut
- Dust can be controlled well
- The bit can last longer
- Minimize Binding in cut
- Can be worked on thicker wall
Although there is a lot of advantage of wet core bit, there are still occasions the dry core bit is necessary. There are times when water is not accessible or the slurry from wet drilling is not acceptable on the working site. In this case, using a dry bit on a standard handheld core drill or core drill rig would be a better option. A dry core bit can be used on a rotary hammer drill in in conjunction with an adapter but RPM’s are typically slower and precise control over the bit while using an adapter is not desirable. The clutch system on a dedicated core drill is preferable when core drilling vs a rotary hammer.
Block, brick, or soft concrete are still the only recommended materials to use a dry core bit to drill. Horizontal drilling is preferable to vertical when drilling dry because the dust is not extracted efficiently leading to slower drilling and more binding of the bit.
|Materials||Dry Core Bits||Wet Core Bits|
|Hard Brick||Usable with water||Recommended|
|Reinforced Concrete||Not Recommended||Recommended|
|Equipment||Dry Core Bits||Wet Core Bits|
|Angle Grinder||Do Not Use, RPM’s too high, no clutch||Do Not Use|
|Rotary Hammer Drill||Usable (turn off hammering)||Not Recommended|
|Hand Held Core Drill||Recommended||Recommended|
|Core Drill Rig||Recommended||Recommended|