Рекомендации по использованию и безопасности.

How to choose a diamond tool?
In more than 30 years of experience we have created a complete range of diamond tools enabling us to offer you the most suitable product for cutting a wide variety of hard or soft, and high or low abrasive materials, with any type of machine and with any precision or cutting speed you require. First of all, there are versatile solutions enabling users to cut various materials with the same tool: in fact, the universal diamond tool is recommended for those not requiring a perfect finish and for those not having big cutting jobs to be executed. On the other hand, for high performance in terms of wear or cutting finish, use of a specific blade is indispensable, such as, for example, the blade for cutting ceramic, or that for cutting granite. On the next page you will find a guide that will allow you to easily choose the ideal blade for your work.

Diamond tools
The diamond tools manufactured by PENTAX according to EN 13236 ensure safety of use and working. On all kinds of blades - those with laser welded segments on the steel core as well as those with continuous or turbo rim - destructive, non-destructive and cutting tests are carried out, in order to guarantee the constant high quality. PENTAX also ensures the product’s traceability by means of production lot records which perfectly identify each single item leaving the factory. In case of accidents proved to have been caused by production defects, PENTAX diamond tools are covered by a product liability insurance. In order to obtain best performance and cutting, we recommend to carefully follow the instructions and indications listed below:

1. Choose the blade according to the material to be cut and the machine used, with perfect matching of the hole diameters; this also holds good for the flange, when present (pic. 1).
2. Clean the flange before mounting the blade.
3. The rotation sense of the arrow on the blade must correspond to the machine’s rotation sense.
4. A blade out of balance leads to increased wear and even to the possible destruction of the tool. Make sure that tolerances do not exceed ± 0,15 mm.
5. Do not work with pressure, the machine’s weight is enough. Higher pressure means increased wear.
6. Cut with the blade by following a swinging movement, especially while working on hard materials.
7. Keep the exact tool inclination while cutting; cut along a straight line.
8. In case the blade looses sharpness (noticeable by strong spark development), sharpen it by doing some cuts on an abrasive material such as sandstone.
9. In order to properly exploit the tool’s life, use it up to the wear and tear of the segments or rim.
10. Only use machines with protection cover (pic. 2).
11. Despite the highest safety level of our tools, always wear protection clothes and accessories. Damaged, inadequate or not correctly assembled cutting tools are dangerous and may cause serious accidents. Also follow safety regulations in force in each country.
12. Diamond tools must not be used for grinding operations (pic. 3).
13. The rotation speed has to be adjusted to the blade type.

RESTRICTIONS ON USE:
RE 2 = not permitted for hand-held cutting - off
RE 10 = not permitted for dry cutting - off
RE 11 = not permitted for hand-held and manually guided cutting - off


Dry diamond core bit
For the drilling of holes in bricks and not re-inforced concrete. The use of water-cooling is not required. Make use of a high capacity drilling machine and a high-speed, appropriate for the diameter of the core drill. At least 1000 Watt up to ø 82 mm and at least 1300 Watt from ø 82 mm up to 152 mm. Recommended number of revolutions: 1000 up to 3000 RPM. Do not use a hammerdrill. Center the drill bit at a low-speed (by means of the electronic speed regulation). The use of a centring aid indicades the drilling position accurately (pic. 4). Remove the centring aid as soon as a drilling depth of ±3 mm is reached, in order to reduce resistance. Then switch over to the required speed. Choose a low-speed for hard materials and a high-speed for soft materials. The use of a centring aid is not necessarily required if the exact position of the hole is less important. In that case start drilling in an inclined position (±30°) until a drilling depth of ±5 mm is reached. Then gradually change into a 90° position. Make sure that the rotational speed does not decrease too much as a result of a too high pressure. As to the drilling speed: the right speed results in a better performance than a too high pressure. A regular withdrawal of the drill from the drilling hole guarantees a sufficient removal of the bore dust (especially when drilling in humid walls). When the drilling becomes more difficult, it might help to switch over to an other rotational speed. The wear out of the drill bit in hard materials such as concrete, is considerably higher than in softer materials. The drill is not suited for wood, metal or plastic etc. For drilling in reinforced concrete, we advice the use of special Diamond core drills for the use with watercooling. The core drill can be sharpened by drilling a number of holes in an abrasive (soft and sandy) material such as sandstone or in a special grindstone (accessory).

Wet diamond core drill
Diamond core bits for professional and non-professional applications on concrete and strongly reinforced concrete, WET drilling only. To be assembled on motors with mechanical or electronic gear having a fix mounting, with large water flow. For diamond core bits diametre 40 mm. to 130 mm., use machines with settable speed 1000 to 600 rpm, without percussion, and power 1600-2000 Watt. Beyond 130 and up to 200 mm., the motor power should be > 3000 Watt and speed to be reached 280 rpm. Diametres > 200 mm are for professional use only. The motor mountings must be firmly fixed to avoid oscillations (pic. 6). The motor mandrel must be perfectly balanced and aligned to avoid anomalous rotations or deviations from the circular orbit of the part bearing the segments. In case an iron bar or a bar crossing point is found while drilling, decrease the speed and increase the pressure on the core bit. Thus the diamond easily comes free on the segment’s surface. Make sure at the same time that the water flow is abundant (pic. 5).



In case the core bit gets stuck due to an iron cut tangentially and leaving its location, rotate the core in opposite direction and try to pull it out. If you do not succeed, try and hit on the bit’s upper part with a hammer and gentle strokes to avoid damaging the drill bit. Once the core bit is taken out, enter the cut with a chisel and break the concrete core. Take it out and make sure the iron keeping the drill bit stuck comes out as well, otherwise the loose iron part could damage the diamond segments. Make sure that no other loose parts are inside the hole. Resume the drilling job until the end. Do not use hammers or other heavy tools to extract the concrete core from the drill bit; simply hit it with a flat iron while keeping it upright and using the force of gravity and the water pressure to extract the concrete core. The segment consumption is higher in case of very hard concrete or a high percentage of reinforcement iron. The core bit is not suitable for drilling wood, plastic and fibre materials. To make the diamond particles of the segments come free, drill on abrasive materials such as sandstone or use specific grindstones.