How to choose a diamond core drill suitable for a specific application scenario?

Clearly define the "core requirements for drilling"—balancing drill bit precision with efficiency.
The hole diameter, depth, precision requirements, and production efficiency of the drilling process determine the structural design and performance focus of the drill bit, helping to avoid "over-specification" or "insufficient precision."
1. Match by "Aperture Size"
Micro-holes (≤1 mm, such as those in semiconductors and medical devices): Choose "diamond micro-drills," ensuring the drill body concentricity is ≤0.003 mm (to prevent drilling deviation). The diamond particles should feature "fine granularity + high-density arrangement" (guaranteeing a hole wall roughness of Ra ≤ 0.2 μm), while the drill body itself is made from cemented carbide (which offers high rigidity and helps minimize vibrations).
Example: In the medical field, "ceramic syringe perforation" (with a hole diameter of 0.3 mm) requires ultra-fine-grained diamond micro-drills with a resin binder to prevent burrs on the hole walls.
Standard aperture sizes (1–50 mm, e.g., for construction and industrial machining): Choose the "Standard Diamond Core Drill." Depending on the aperture size, select either a "Hollow Drill (for larger apertures ≥10 mm, offering lightweight design and excellent chip removal)" or a "Solid Drill (ideal for smaller apertures ≤10 mm, providing superior rigidity)." The drill body is made from high-carbon steel or cemented carbide, suitable for use with standard electric drills or bench drills.
Example: In construction, "drilling a 16mm air-conditioning hole in a concrete wall"—choose a hollow-type metal-bonded diamond core drill with 3 chip-flute grooves.
Large-diameter applications (≥50mm, such as stone curtain walls or large-scale equipment): Choose either a "segmented diamond core drill" or a "combination drill bit," featuring a thicker matrix (to resist deformation) and an expanded diamond layer (to increase the cutting area). Additionally, these applications require compatible large bench drills or vertical drilling machines to ensure stable operation.
Example: For stone curtain walls, "drill 80mm threaded holes," use segmented hollow core drills with a copper-based bond to prevent excessive load during a single drilling pass.
2. Match by "Drilling Depth"
Shallow holes (depth ≤ 3 times the hole diameter, such as surface openings): Standard drill bits are sufficient—no special design required—focusing instead on "feed rate" (to enhance efficiency).
Deep holes (depth > 5 times the hole diameter, such as in pipe perforation or geological exploration): It is necessary to select a "specialized deep-hole drill with cooling channels," featuring an axial cooling hole in the matrix (which allows coolant to flow in, preventing the drill bit from overheating). Additionally, the chip evacuation flutes should be lengthened to minimize debris blockage, and the diamond binder should use a "highly wear-resistant iron-based material" to extend the tool's lifespan.
Example: In geological exploration, "drilling a 200-meter-deep borehole into rock"—choose a polycrystalline diamond core drill (with inner tube coring), using a nickel-cobalt alloy binder (resistant to high pressure and abrasion).
3. Match by "Accuracy Requirements"
High-precision requirements (aperture tolerance ≤ ±0.01 mm, hole wall Ra ≤ 0.1 μm, e.g., in optics and semiconductors): Choose either a "natural diamond drill bit" or a "high-precision synthetic single-crystal diamond drill," with an ultra-fine-grain cemented carbide substrate (concentricity ≤ 0.002 mm) and "directionally aligned" diamond particles (ensuring uniform cutting performance).
Standard precision (hole diameter tolerance ≤ ±0.1 mm, hole wall Ra ≤ 1.6 μm, e.g., in construction and general machinery): Select "conventional synthetic diamond drill bits," using a standard cemented carbide or high-carbon steel matrix, with diamond particles arranged "randomly" (low cost, high efficiency).