Dry Diamond Core Bit Guide

Dry Diamond Cores are used by many trades for many applications, with significant effect. However, there are a few basic dos and don’ts to follow, and some valuable tips that can help you along the way.

When drilling with dry diamond cores, dust mustn't be allowed to accumulate in the hole. If dust is allowed to accumulate, it can lead to several issues.

The most serious issue is the core becoming ‘jammed’ within the hole. This will cause the machine to ‘kick’ and potentially injure the user if the machine is not fitted with a safety clutch. For the safety clutch to operate correctly, the manufacturer-supplied side handle must be fitted to the machine.

There is an increased risk of the core jamming in the wetter, winter months when the bricks and blocks have absorbed moisture. Damp dust can form a paste around the core during drilling, increasing the risk of the core becoming stuck. To reduce the risk of this happening, periodically withdraw (almost completely, making sure that the core continues to spin) the bit from the hole and allow the debris to fall away and disperse. This should be done for every inch of material penetration. In drier, less problematic conditions, clearing the hole every couple of inches is sufficient, as dust is less likely to bind to the core.

Dry Diamond Core Bit Do's

• Always use the appropriate PPE
• Select the right core bit for the application
• Wherever possible, use a dedicated diamond core machine with a mechanical or electronic safety clutch.
• Always use the side handle provided with the core drill.
• Eject the pilot drill once you have drilled approximately ½” into the material.
• During the drilling process, clear the debris from the hole by periodically partially withdrawing the bit and allowing any debris to escape, reducing the risk of the core becoming jammed into the hole
• Apply only sufficient pressure to keep the core in contact with the material surface and allow the core to do the work.
• Forcing the core will affect drilling speed and shorten its life.
• If the core becomes jammed in the hole, remove it manually. In these situations, using the machine's power to free the core WILL damage the machine's safety clutch.
• Continue to rotate the core whilst withdrawing from the hole

Dry Diamond Core Bit Don'ts

• Don't use the hammer action when drilling with a dry diamond core bit.
• Don't apply excessive pressure whilst drilling. This will only reduce drilling speed and may cause damage to the machine.
• Don't make long, continuous drilling motions without clearing the debris by partially withdrawing from the hole.
• Don't drill hard materials such as cast concrete, granite or porcelain. (See Core Bit Guide)