Режущие и зажимные инструменты Hoffmann Group 2026 - страница 254

GBP 57 Thread generation to good process reliability The steps to a thread that satisfies the gauge. The generation of a correct thread requires not only the cutting of the thread itself but also several preparatory and subsequent operations. This begins with selection of the correct core hole diameter and ends with the checking of the finished thread. Core hole End cutting thread milling Pre-drilling Pre-drilling and The twist drill creates countersinking the core hole for the in a single operation thread-cutting tool. The new GARANT Master Steel FEED stepped drill creates the 90° countersink for the thread in a single operation together with drilling the core hole. Countersinking Chamfer The protective countersink The chamfer facilitates the entry facilitates the entry of the of the following thread-cutting following thread-cutting tool. It can also increase tool life. tool. It can also increase tool life. Check the core hole drilling End cutting Check the tapping diameter. thread milling Check the surface quality. There is no need for Check for machining residues. pre-machining. The core hole, protective chamfer and thread are generated in one machining step. 13 Generating threads Tapping Thread forming Thread milling The thread is generated by a The tool executes a circular rotating movement of the movement performed via spindle and a longitudinal the CNC machine, movement of the tool axis. generating the desired thread pitch. Gauging the thread The thread plug gauge tests the cut internal thread for the effective diameter, pitch deviation, part flank deviations and form profile, as well as for the minimum external diameter. Core ⌀ Flank angle Thread pitch P Thread profile Flank ⌀ Nominal ⌀ (external ⌀) 254