Instruction for use Rotary Hammer Drill Bit SDS-plus and SDS-max

Instructions for use: Rotary hammer drill bits

General work instructions

Rotary hammer drill bits are primarily used in concrete, masonry, natural stone, etc. They are not suitable for materials such as bitumen, plastic, glue, adhesives and metal. The rotary hammer drill must be guided in a straight line with continuous feed. Lateral pressure must be avoided. Only use concentric tools. Do not forcibly twist drill bits. To avoid breakage around the drilled hole, placing a wooden panel over the material being drilled or masking the drilled hole is recommended.

Drilling with lengths ≥ 450 mm:
For better guidance of these drill bits, predrill to at least 150 mm with a drill bit of a comparable diameter. When drilling deeper than 150 mm, raise the drill bit regularly to remove the drilling dust. This is especially important when drilling vertically downwards. Otherwise there is a risk of compacted drilling dust and the drill bit jamming in the drilled hole.

Drilling with hollow drill bits:
When drilling downwards, it is recommended to begin drilling lightly at first. Then use a drill bit to drill a hole through the material at the bored
indentation. This lets the drilling dust flow unimpeded through the drilled hole and results in faster
drilling progress.