Helical-tooth / pointed-tooth electroplated diamond single-tube core drill bit
Helical-tooth / pointed-tooth electroplated diamond single-tube core drill bit . Single-tube design with helical pointed tooth geometry for aggressive cutting in hard competent formations. Electroplated diamond layer exposes sharp abrasives for fast penetration in granite, marble, corundum, quartz, bluestone, limestone, and concrete. Available from φ35 mm to φ330 mm for drilling and mining core extraction.
Rock-Breaking Mechanism of the Helical Pointed Tooth : The helical pointed-tooth crown replaces continuous flat-tooth grinding with discrete tip cutting points. Each tip contacts the rock first, concentrating weight-on-bit onto a small contact area to induce stress concentration and efficient penetration. Inter-tooth grooves simultaneously channel cuttings and cooling water, reducing regrinding. Compared with a flat-tooth crown, the helical pointed tooth cuts deeper and clears debris more smoothly at the same weight-on-bit.
Application Boundaries of Single-Tube Coring : Single-tube barrels offer high connection rigidity and a simple structure, making them suitable for shallow-to-medium depth coring. In mining engineering, geological survey, and highway/railway bridge foundation investigation, the bit paired with a single-tube barrel rapidly yields columnar cores from medium-hard to hard formations such as limestone, bluestone, and marble, providing samples for stratigraphic interpretation and orebody delineation. For greater hole depths or broken formations, consider switching to double-tube or wireline coring tools.
Sharpness and Life Limits of Electroplating : Electroplated diamond bits use a single-layer diamond exposure structure with tall protruding abrasives, giving initial penetration rates clearly superior to impregnated bits and maintaining fast cutting at lower weight-on-bit in medium-hard, moderately abrasive materials such as marble, bluestone, and concrete. Note that the single-layer plating has limited life in highly abrasive formations (quartz-rich granite, corundum); prolonged continuous drilling accelerates diamond pull-out, so weight-on-bit, rotary speed, and flushing fluid flow should be matched to formation abrasivity.
| Diameter (mm) | Typical Application Focus |
| 35 / 45 / 50 / 56 / 60 | Small-diameter coring, anchor holes, inspection holes |
| 75 / 89 / 91 / 108 / 110 | Standard geological coring, mining exploration holes |
| 127 / 130 / 146 / 150 / 168 / 171 | Water wells, engineering investigation coring |
| 194 / 200 / 219 / 220 / 245 / 250 | Large-diameter engineering coring, bridge foundation investigation |
| 275 / 280 / 325 / 330 | Special engineering coring, large-diameter pile testing |
The table groups the 26 standard diameters of the helical pointed-tooth electroplated diamond single-tube core bit from φ35 mm to φ330 mm by diameter range. Select the size according to hole diameter requirements and drill string compatibility.
Q&A
:
Q: What formations does this bit suit?
A: Hard competent rock, marble, granite, corundum, quartz, bluestone, limestone, and concrete.
Q: How is the penetration rate?
A: Exposed single-layer electroplated diamond gives fast initial penetration in medium-hard to hard rock; helical pointed teeth aid chip clearance and cooling, reducing regrinding.
Q: When should it not be used?
A: Avoid long continuous runs in highly abrasive quartz-rich granite (limited single-layer life), soft plastic formations (bit balling), and dry drilling. Water cooling is required.