V - The magazine of the VOLLMER Group - 2018

1 2 3 Ridge width Tooth face Main cutting edge Major flank Nose Chamfer width b Minor cutting edge Spine diameter Chamfer Minor flank (top) Cross-cutter Flute Rear edge Drill diameter d Core thickness k Tangential clearance angle Tooth top Tooth top at blade Bottom chamfer Tooth length Tooth thickness Tooth face T o o t h s u r f a c e B a c k a n g l e Side view Tooth projection/flank projection Tooth width / cutting width Side Side Front view Top view Radial clearance angle Straight tooth Alternate top bevel tooth Flat trapezoidal tooth Trapezoidal tooth Practical know-how and impulses for your business – by the professional for professionals: That's FEED. In this edition: /// GEOMETRIES OF CIRCULAR SAWS AND ROTARY TOOLS /// MEASURING METHODS //FEED/// GEOMETRIES OF CIRCULAR SAWS AND ROTARY TOOLS As varied as the applications of circular saws and rotary tools are, the geometries of their saw teeth and cut surfaces are just as diverse. Behind every single geometry and behind every angle lies a high investment of know-how and development – and always a special reason why they are exactly as they are. However, there are various terms or names circulating on the market. For a common understanding we list the most important geometries, angles and cross-sections with their tech- nical terms below. GEOMETRIES OF CIRCULAR SAW TEETH There are hundreds of different geometries for circular saw teeth worldwide – with a rising trend. This large range is necessary in order to be able to achieve the most precise work result possible depending on the material hardness and the material being machined. The slightest change in an angle can lead to a measurable deviation of the result – and as a result also have a corresponding effect on the cross-section (Fig. 2). GEOMETRIES OF ROTARY TOOLS As with circular saws, there are also umpteen different geometries for rotary tools. And also here the smallest changes have a direct effect on the result of the machining process. For example, the size of the angle and radii at the cutting edge, as well as all lengths, widths and distances, are decisive. To some extent the geometries of rota- ry tools are even extremely complex. A standard designation therefore helps during technical exchanges (Fig. 3). 1  DESIGNATIONS AT HW TOOTH 2  CROSS-SECTIONS OF CIRCULAR SAWS 3  DESIGNATIONS OF ROTARY TOOLS USING A TWIST DRILL W e d g e a n g l e 25 24 FEED