The manufacturer of diamond discs and drills ASTAR offers top quality cutting and drilling tools for the construction industry, stonemasonry and tile workers. We also supply professional concrete drilling machines, hand-held or stationary , cutters and other tools and accessories.
We are pleased to present our production range of professional, high-quality diamond tools for the construction, stone, glass and refractory industries. In our range you will find diamond discs, diamond drills, diamond crowns, diamond grinding discs, concrete drilling machines, mobile cutting machines and road cutting machines.
We distinguish ourselves with a continuous and vigorous research and production effort to provide diamond tools properly selected for each application; we produce high-performance tools to save labour costs and time.
We also carry out the reconditioning of worn diamond segments on saws, grinding discs and core drills. We deliver diamond tools to our customers by shipping or post. Check out our full range of diamond tools.
We offer diamond crowns, tubular crowns with diamond segments of various types and hardnesses - for different types of tasks, respectively.
...read more
The key difference lies in the way they work: a hammer drill breaks up the material by striking it (approx. 50,000 blows per minute), which causes vibrations and micro-cracks, and limits its effectiveness to around 20–30 mm in concrete. A diamond core drill operates solely by rotation — the diamond core bit grinds away the material without impact, using water cooling. This produces holes with clean, precise edges ranging from 20 mm up to 600 mm, without causing stress in the substrate. Diamond drilling rigs are also significantly quieter and do not generate dust.
Diamond core drills are effective for drilling into ordinary and reinforced concrete (reinforced concrete with steel), solid brick, hollow brick and silicate brick, natural stone (granite, basalt, marble, sandstone) as well as ceramic tiles and terracotta. The hardness of the substrate determines the choice of drill bit: for soft concrete and brick, drill bits with hard diamond segments are used; for hard rock, segments with a lower binder hardness are used so that the diamond can be exposed during operation.
In wet drilling, water is fed directly onto the drill bit — it cools the diamond segments, carries away cuttings and eliminates dust. The result: the drill bit’s service life is significantly longer, the borehole has a clean edge, and the working environment remains dust-free. Dry drilling is only possible with special segmented drill bits featuring heat-dissipating grooves, but only up to diameters of approx. 68 mm and in short cycles (a maximum of a dozen or so seconds of drilling, followed by a cooling break). Exceeding the operating temperature causes irreversible burnout of the segments.
The motor power must be sufficient to overcome the cutting resistance of the crown, which increases quadratically with the diameter. For holes up to 82 mm, a 1.5–2 kW drill with manual guidance is sufficient. The 82–162 mm range requires a 2–3 kW machine, preferably with electronic speed control, which allows the speed to be adjusted to the hardness of the material. Holes larger than 162 mm require a drill of 3 kW or more, operation at low speed and a drill stand — it is impossible to maintain alignment manually under such cutting forces.
It depends on the diameter and the angle of drilling. Up to 68 mm in a horizontal floor or a thin wall, you can work by hand — the torque is still manageable. From 82 mm, a drill stand becomes a practical necessity: it eliminates axial vibration, protects the drill bit from lateral loads (which can reduce its service life by as much as 70%) and ensures the operator’s safety. When drilling into ceilings, vertically into walls or at an angle, a drill stand is essential regardless of the diameter — it is impossible to maintain the correct pressure and direction using only manual force in such cases.
After each use, flush the water system with clean water (residues of cement slurry corrode the seals), clean the spindle thread and dry the machine before storing it. It is advisable to sharpen the drill bit regularly — a few drill holes in a soft, abrasive material (brick, sand block) expose fresh diamond grains and restore cutting performance. Every 100–150 working hours, check the carbon brushes and replace them if they are less than 6 mm long — worn brushes can damage the motor commutator, which is a much more expensive repair.
