ROUND TOOLS 14 / NORTON WINTER PRECISION TECHNOLOGY TOOL GRINDING GENERAL INFORMATION Drills, end mills, reamers, stepped tools and special-purpose tools in varying designs and geometries are described as round tools. Tool geometries are produced by grinding in successive production steps. A typical sequence starts with the preparation of the blank, (tools for trimming blanks can be found in the section for ‘Diamond and cBN cut-off wheels’) which is followed by flute grinding, gashing and grinding of the clearance angles. The product range for round tools is extensive. Different materials and tool geometries make various demands on the grinding tools used in manufacture. Information Further information on applications and products can be found at www.nortonabrasives.com Shorter grinding times, better suitability for automation and longer dressing intervals are required. Specific grinding wheel characteristics such as edge stability and free-grinding behaviour have to be carefully balanced. ROUND TOOLS GENERAL INFORMATION FLUTE GRINDING GASH CLEARANCE ANGLE GRINDING Drill End mill Source: Gash 1. Clearance angle 1. Clearance angle 2. Clearance angle Clearance 2. Clearance angle Flute This section is structured according to the procedure described. Here you see an example of an end mill and a drill. Generally, the same tool geometries are used for the individual process steps. Only flute grinding uses different grinding wheel designs. While 1A1 and 1V1 grinding wheels are used primarily for end mills, profile grinding wheels such as 14F1 and similar (Norton Winter shape 700) are preferred for drill production.
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