Threading Technology – Clamping Technology 520

357 Thread Mills UNC UNF UN M MF NPSF Rp (BSPP) G BGF W BSW, BSF NPT NPTF Rc (BSPT) STI SELF-LOCK Accessories Tech. Info v c / f z Product Finder ZBGF GSF (Aero) GSF-Z GF(I), GF-Z GF-Vario-Z GF-H GF(I)-KEG ZGF(I) CIRC-GF Gigant FPC, FMC MoSys 4.3 Possible modifications on thread mills Face chamfer (with or without cutting face) Removal of incomplete thread Suitable for: • All types GF and GSF • All types BGF (face chamfer on the drilling part) Note: • Face chamfer for circular chamfering of the thread hole • Additional cutting face for circular face milling Suitable for: • All types GF, GSF and BGF Note: • At the rear end of the thread part, a step with a length of min. 1 x P is relief-ground • If the tool plunges to a correct depth during the thread milling process, the incomplete thread run-out with its burr is milled off (removed) Recessed neck IKZN – Internal coolant supply exiting in the flutes Suitable for: • All types GF and GSF (no countersinking step) Note: • For larger thread depths (total thread depth is achieved by a double milling process) • For constant cutting pressure, the thread part length and the neck length are arranged in a ratio of 1:1! • The thread part length and the offset for a second milling process are always a whole-number multiple of the thread pitch Suitable for: • All types GF and GSF Note: • Axial coolant bore closed up at the tool face for the production of through hole threads • For maximum stability of the cutting part, the lateral coolant holes are axially staggered AZR – Radially alternating tooth rows Coolant grooves along the shank Suitable for: • All types GF, GSF and BGF Note: • AZR helps to reduce lateral forces in thread milling; the alternating missing gaps in the thread are produced by additional circular milling orbits There is another variant, not shown here, called AZ (alternating teeth in a staggered sequence) Advantage: • No additional circular orbits are necessary; due to this, there is a perfectly normal recess depth at the hole bottom, if BGF type tools are used Suitable for: • All types GF, GSF and BGF Note: • For the production of through hole threads • In addition or as an alternative to IKZ or IKZN • Possible support in the cooling of the countersinking step of GSF and BGF type tools, or of the plane milling head in MoSys applications