Каталог Iscar сверла ружейные и для глубокого сверления 2022 - страница 119

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Standard Gundrill Length Calculations

H D

N W B F LA

Ls L Standard Gundrill Carbide Head Length H

D

D=Cutting diameter
H=Carbide length
N=Regrinding area = H-D
W=Hole depth
B=Chip evacuation area = For typical
gundrill machines, 250 mm
=For machining centers, 2xD (minimum 15 mm)
F=10 mm.
LA = Driver length
LS = Flute length
L=Overall length

Example Drilling of a ø10x500 depth hole on a gundrill machine with ø25x70 mm driver code No. 57 (See page 302) D=10 W=500 LA=70 B=250 (or per experience) L=N+W+B+F+LA L=(35-10)+500+250+13+70=858 (OAL) Ls=N+W+B=770 (flute length) Ordering Code For example: D and Ls are available as standard STGD-10000-0858-57-IC08 Diameter Range Head Length

2.50-3.8020
3.80-4.0523
4.05-5.0525
5.05-6.5530
6.55-11.0535
11.05-18.3540
18.35-21.3545
21.35-23.3550
23.35-26.3555
26.35-32.0065

Note: regrindable length=H-D

Pressure and Coolant Flow Rate for Gundrills

Bar L/min 120 120

110Q 110
100L/D>100100
P
9090
8080
70L/D<10070
6060
5050
4040
30L/D>10030
20L/D<10020
1010

Ø 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 40 mm

Drilling Diameter Q l/min P bar Gundrill Lubrication and Cooling Guidelines for Optimal Gundrill Performance The best performance is obtained by using oil. It is recommended to use a strong coolant flow for

On equipment that uses water-soluble fluids (i.e. efficient chip flushing and cooling of the cutting edge machining centers and CNC machines), a concentration It is recommended to use a filter under 20 µm between 10% and 15% is recommended. Note: Improper filtration may result in interrupted flow of lubricating oil. This creates a sticky surface on the bearing pads and leads to premature wear of the tool and overloading the coolant pump and spindle seals

  • The coolant temperature should be between 20 and 22º C. Note: Above 50º C the viscosity of the coolant is reduced by 50% and becomes ineffective.