Page 197 - Demo

195SPOT DRILLING AND CHAMFERINGMM HCDIn the MULTI-MASTER standard product line, MM HCD heads have point angles of 60%u00b0, 80%u00b0, 90%u00b0, 100%u00b0 and 120%u00b0. Such a variety relates mainly to the requirements of different standards for chamfers and countersinks for fasteners. For example, metric countersunk screws require a 90%u00b0 countersink, but American National countersunk screws require 80%u00b0 and aerospace rivets 100%u00b0. A typical chamfer features a 45%u00b0 chamfer angle, although 30%u00b0 and 60%u00b0 chamfers are also common. This multiformity of required generated profiles defines the functional capabilities of the heads and explains their variety.Although the MM HCD head was designed for a moderated chip load, this tool may also be suitable for spot drilling.ChamferingDrillingCountersinkingExplanation of Drilling Heads MM HCD Description Example:MM HCD 100 - 120 - 2 T061 2 3 4 51 Designation of the Drilling HeadMM HCD %u2013 interchangeable 2 flute head for chamfering, countersinking and spot drilling with MULTI-MASTER connection2 Cutting Diameter Maximum (DCX)DCX3 Point Angle140%u00b0DC4 Number of Cutting Edges5 MULTI-MASTER Connection Size