133 ! M-Zahn SCREW DRIVING HELLER QUALITY FOR PERMANENTLY OUTSTANDING RESULTS TIPS & TRICKS TEETH TYPES Rip cut teeth Rough and fast cut to process any types of wood, plastic, non-ferrous metals and aluminium. Rip cut, sharpened teeth Quick and moderately clean cut to process any types of wood and plastic. Regular teeth (push and pull) Rough and fast cut to process any types of wood, plastic, non-ferrous metals and alu- minium. Variable tpi For example 10-14 teeth per inch (tpi). Ap- plicable in wood and metal or wood with metal residue. Teeth We recommend the use of closely posi- tioned teeth in thin materials and the use of large teeth in thick material. The correct number of teeth per inch The tooth geometry and the tpi value, specifying the distance between teeth, determine the development of chips and the sawing progress. 2-3 teeth must be permanently processing the material and this rule of thumb is also used to determine the correct tpi value. Serrated teeth Accurate and clean cuts in steel, iron, alu- minium and non-ferrous metals. Blade with tapered finish and chamfered teeth Very clean and accurate cuts in all types of wood and plastics. Teeth cutting in one direction For very clean and surface cuts without fragments. "M” teeth Universally suitable saw blade for almost any material. Quick cuts, up to twice as fast as regular teeth. Up to three times longer service life compared with conventional saw blades. Service life The targeted use of coolant, such as cutting oil (for steel or metals), turpentine (for alumin- ium), water (for plastic or Perspex) is neces- sary to increase the service life and resistance to wear of saw blades. Heller exclusively uses the best steel grades for tools the company produces. At the same time, the company focuses on accurate processing, evident in properties including the straight guiding of jigsaw and sabre saw blades. After all, all Heller products contribute to faster and more cost-effective working for traders.