Question 1

What types of drill bits are recommended for the KRESS HM 550 drill and what are their materials?

Accepted Answer

The KRESS HM 550 electric drill exclusively uses SDS-Plus shank drill bits, which lock into the specific chuck without a key. This is a crucial element to check when purchasing your drill bits.

For simple drilling (without impact):

In steel: High-speed steel (HSS) drill bits. Your KRESS HM 550 accepts up to 13 mm in diameter. Ensure that the drill bits are perfectly sharpened and in excellent condition for the best results.
In lightweight alloys: HSS drill bits, maximum diameter 16 mm.
In wood: HSS drill bits, maximum diameter 30 mm.
In plastic: Suitable HSS drill bits, taking care not to create cracks while drilling.

For impact drilling (hammer drilling): You must exclusively use carbide drill bits with SDS-Plus shank. These drill bits have carbide tips that withstand impact energy (maximum 2.0 J). The manual explicitly states that it is impossible to use standard stone drill bits with a cylindrical shank, even with an adapter, as the pneumatic impact mechanism only works with SDS-Plus carbide drill bits.

Recommended diameters according to the material: For concrete, maintain a diameter range of 5 to 14 mm with impact (maximum 20 mm for simple drilling). This 550 W drill offers good power for these diameters without excessive effort.

Practical tips: Always adjust the rotation speed (0 to 1000 rpm) according to the material and the diameter of the drill bit. For precision work in metal or wood, use a drilling stand as an accessory. Before drilling, check for hidden electrical cables or pipes using a metal detector.

Question 2

Can the KRESS HM 550 drill through reinforced concrete?

Accepted Answer

The KRESS HM 550 drill is primarily designed for drilling materials such as wood, metal, and plastic. To drill through reinforced concrete, it is necessary to use a drill equipped with a hammer function and suitable bits, typically tungsten carbide concrete bits.

Here are some points to consider:

Hammer function: Reinforced concrete is a very hard material. A drill without a hammer function will struggle to effectively drill this type of material.
Type of bit: Always use specific bits for reinforced concrete, which are reinforced to withstand the wear and hardness of concrete and steel.
Power of the drill: The KRESS HM 550 must have sufficient power for this type of work. If it does not have the hammer function, it is not suitable for drilling reinforced concrete.

In summary, if the KRESS HM 550 does not have the hammer function, it is not recommended for drilling reinforced concrete. For this type of material, it is better to use a hammer drill or a rotary hammer specifically designed for this purpose.

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