Lessmann 2019 GB FINAL

Our own production of nearly all components of our standard programme and our own de- velopment of special articles enables us to have an excellent knowledge in both manu- facturing quality and safety testing. Creating Innovation, Exceeding Safety Standards, Keeping Top Quality With this motivation we make complex de- velopment and product tests as an essential part of our work. Material Tests These are the first steps of our quality ma- nagement: All deliveries of raw material are tested according to and above specification details. All wires are tested for their tensi- le strength and for their reverse bending strength by a fatigue measuring process. Beside the quality of the material it is impor- tant that its attributes are as suitable as pos- sible for their intended use. Imbalance Test An imbalance of machine driven brushes is not pleasant and is dangerous for the health of persons working at the machine. Although it is not necessary under the DIN or the EN Norms, we produce our brushes ac- cording to our own standards for minimum imbalance. By doing so our customers take advantage of smooth running fatigue redu- cing brushes. Our employees in production ensure that these high quality aspects are maintained. LESSMANN Quality is Safe We guarantee the best quality and long life- time for our products. Our brushes are manufactured according to the existing standard EN 1083-2 and ANSI 165.1. All the relevant machine driven bru- shes are checked for occupational safety using a centrifugal force test. Safety Information All machine driven brushes require as with other rotary tools, that the required safety precautions are kept: Safety for Your Body All operators and other personnel in areas where rotary brushes are being used must wear safety goggles or face shields and pro- tective clothing. For your own safety: Wear personal protective equipment Brush Check The brushes should be checked for damage before using. A correct mounting is imperative. Correct Incorrect right pressure high pressure Safety Tests According to European safety norms all brushes have to with-stand 1.5 times of the mentioned maximum RPM. Naturally when developing a brush, we test every brush type for this safety aspect. Only if all tests are sa- tisfactory, can the article be produced. During production many samples are taken of the brushes in order to check the required safety speed. Should a model or a raw material be changed we begin the tests again. For this very reason every customer can rely on a high quality and safe tool. Lifetime and Power For the measurement of the lifetime and po- wer of technical brushes there are neither norms nor standard procedures. After long developing processes and many tests we have found testing methods that simulate testing in real working conditions. On self built machines we are able to test the abrasi- on and thus the lifetime and power of machi- ne driven brushes. Beside the quality aspect these tests are hel- pful in optimising materials used, as well as component parts and the construction of bru- shes. Even if in comparison tests with com- petitor brushes such testing has shown and proved the high quality of our products: We keep on testing to guarantee customer satisfaction. Quality is our feature! Accredited with DIN EN ISO 9001:2015 1 2 3 4 5 6 7 0 The performance figures mentioned above are only guidelines. *Power requirements for a brush width = 30 mm Warning: Before each operation please compare the idle speed of the angle grinder with the max. peripheral speed of the brush! 1,000 2,000 Ø 350* Ø 300* Ø 250* Ø 150 3,000 4,000 5,000 6,000 Power requirements for Wheel Brushes P [kW] n [1/min.] Recommended use of brushes on angle grinders – the right combination Common idle speed of Brush diameter 60 65 75 80 90 100 115 125 150 178 200 angle grinders (WS) Knot Wheel Brush WS 1 WS 1 WS 2 WS 3 WS 4 WS 5 Ø 115 11,000 RPM = WS 1 Cup Brush, Crimped Wire WS 2 WS 2 WS 3 WS 3 WS 5 WS 5 Ø 125 11,000 RPM = WS 2 Knot Cup Brush without Bridle WS 1 WS 2 WS 2 WS 2 WS 3/4 WS 5 Ø 150 9,000 RPM = WS 3 Knot Cup Brush with Bridle WS 3/4 WS 3/4 WS 5 Ø 180 8,500 RPM = WS 4 Knot Bevel Brush WS 1 Ø 230 6,500 RPM = WS 5 Knot Bevel Brush WS 1 WS 1 minimum bore size for wheel brushes according to DIN EN 1083 Diameter of the brush in mm Minimum diameter of bore in mm 50 4.6 75 6.5 100 10 150 13 200 16 250 20 300 20 350 32 “S IMPLY THE BEST” BY TEST ING RECOMMENDAT IONS FOR SAFE BRUSH USE TECHNOLOGY, MATERIAL AND SAFETY Stationary equipment Grass trimmer Angle grinder Drilling machine Straight grinder Machine usage: These symbols in the chapters show on which machines the brushes usually are used. Peripheral Speed The max. RPM indicated in the catalogue are safety figures by which the brushes can be used without danger. Please do not exceed these figures under any cir- cumstances! In most cases a lower RPM is sufficient to gain an optimal result. Correct Pressure The schedule shows the necessary motor drive power for different brush diameters. The brushes need only a light pressure while brushing because only the wire points are effective (please look at the schedule). A hig- her pressure does not improve the brushing effect. In fact the brush lifetime is reduced and greater power is needed. The indicated curves inform you about the expected power. The power ratings refer to a brush with 30 mm width. Working with Shank Brushes When working with shank brushes please note that the shank has to be inserted fully into the tool. This is especially necessary when working with high RPM, for example on straight grin- ders and pneumatic tools. Mechanical Application Only use the brush with the indicated maxi- mal peripheral speed (RPM max.). The max. RPM only is allowed when the brush is clamped min. for 10 mm into the tool. When the brush is inserted into the suitable work piece, higher RPMs are possible. Only use the brush right rotating. 9 8