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DIAMOND TOOLS |
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GRINDING WHEELS |
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MACHINES |
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| Construction > Wet Cut > Drilling > Ring drill & Crown |
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Ring drill & Crown |
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The above table summarizes the standard geometry of these drills. Due to the relatively small diameters and short tool length, these drills are often employed hand-held but accuracy and stability is increased by utilizing a rig.
Thin wall stone and tile drills cut faster than thick wall crowns but are more friable and require some experience on the part of the operator.
Concrete drills, often used for installing anchor and fastening systems, are suitable for reinforced concrete. Lifetime can vary with the local aggregate, |
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density of material and the percentage of rebar.
All crowns have a centralizing groove which is lathed into the diamond-free base. This enables the crown to be positioned at true centre with the correct clearance either side of the tube when brazing. No tools or jigs are required.
Care should be taken to select the correct combination of tube and crown thickness.
By way of example, if the desired crown is 32x3 (denoting 32mm wide and 3mm thick), the tube should ideally be 2.0mm thick with a nominal outer diameter of 31mm giving 0.5mm clearance both inside and out. It is possible to deviate from this using slightly less clearance when drilling stone or tile. Brazed ring drills should be water cooled.
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| Shape |
Height + Base |
Diameters |
Minimum
Thickness |
Availability |
Standard lengths
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Centralizing Groove |
| stone/tiles |
concrete |
Regular
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6mm+2mm
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6mm-72mm
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1.5mm
(stone/tiles)
2.5mm
concrete |
Brazed
Drill or Ring |
60mm
100mm 120mm |
300mm |
Yes |
Regular
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8mm+2mm
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6mm-52mm
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2.5mm |
Brazed
Drill or Ring |
60mm
100mm 120mm |
300mm |
Yes |
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