EWN 04-7 EWN 04-15
Ø 0.4-7.0 Ø 0.4-15.0
Cutting data
The fine boring heads EWN 04-7 and EWN 04-15 are mainly used in the watch and micro industry. Therefore these heads are available with the BIG KAISER-CK connection and with cylindrical shank. For chucking the boring heads with cylindrical shank we recommend BIG MEGA CHUCK collet holders or hydraulic chucks.
Fine boring heads EWN 04-7 (headline bright purple) The highest permissible spindle speed for these boring heads is 30 000 rpm. When working with high spindle speeds (n > 15 000 rpm), the whole and pre-set tool assembly has to be balanced. We recommend the use of a fine balanced tool shank for all operations. Boring cutters with uncoated or coated cutting edges are available. They have a 4 mm shank and are made with flats for the cutting edge orien- tation. For OD turning in the range of Ø 0.2 - 2.3 mm there are pin turning cutters on offer. The boring depth and the pin length “X” are limited by the boring- and pin turning cutters. Fine boring heads EWN 04-15 (headline dark purple) These boring heads are certified for a max. spindle speed of 20 000 rpm. When working with high spindle speeds (n > 10 000 rpm) the whole and pre-set tool assembly has to be balanced. We recommend the use of a fine balanced tool shank for all operations. For boring in the range between Ø 0.4 - 6.0 mm there are carbide boring cutters with coated cutting edge available. The range from Ø 5.8 - 15.5 mm is covered with carbide tool holders for inserts. The shank diameter for the boring cutters and the tool holders is 7 mm. For OD turning from Ø 0.2 - 6.0, there are two different carbide pin turning cutters on offer. The boring depth and the pin length “X” are limited by the boring- and pin turning cutters and the tool holders.
In the table the following terms and dimensions are used: Workpiece material:
Only rough classification of metallic materials Given by the boring cutter or tool holder
Boring depth X:
(mm)
Carbide boring cutter/Insert: For information about carbide boring cutters and inserts consult BIG KAISERmain catalogue. R: Nose radius of boring cutter/insert
(mm)
Vc:
Cutting speed
(m/min)
Stock allow.:
Sock allowance per cut in Ø
(mm)
fn:
Feed per revolution
(mm/U)
63
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