OPTIMUM
M A S C H I N E N - G E R M A N Y
Operation
©
201
0
US
Page 29
Stand 27 / 08 / 2010
Version 1.0.6
BF 30 Vario
Mill Drill
4.8.2
Standard values for speeds with HSS – Eco – twist drilling (U.S. unit
1: Speed (n) in RPM
2: Feed Rate (f) in./rev.
3: Coolant: E = Emulsion; Oil = Cutting oil
The data given above are standard values. In some cases it may be advantageous to inc-
rease or decrease these values.
When drilling, a cooling or lubricating agent should be used.
For stainless materials (e.g., VA or NIRO steel sheets) do not center because the material
might compact and the drill bit will become dull rapidly.
The workpieces need to be held firmly (using vise, screw clamp, etc.).
INFORMATION
Friction during the cutting process causes high temperatures at the cutting edge of the tool. The
tool should be cooled during the milling process. Cooling the tool with a suitable cooling
lubricant ensures better working results and a longer edge life of the cutting tool.
INFORMATION
Use a water-soluble and non-pollutant emulsion as a cooling agent. This can be acquired from
authorised distributors.
Make sure that the cooling agent is properly retrieved. Respect the environment when dispo-
sing of any lubricants and cooling agents. Follow the manufacturer’s instructions for disposal.
Material
Cutter Diameter (in.)
Coolant
3
0,0787 0,1181 0,1575 0,1969 0,2362 0,2756 0,3150 0,3543 0,3937
Steel, unalloyed, up
to 87,000 PSI
n
1
5.600
3.550
2.800
2.240
2.000
1.600
1.400
1.250
1.120
E
f
2
0,0016 0,0025 0,0031 0,0039 0,0049 0,0049 0,0063 0,0063 0,0079
Structural steel, alloyed,
quenched and subse-
drawn, up to 130,000 PSI
n
3.150
2.000
1.600
1.250
1.000
900
800
710
630
E/Oil
f
0,0013
0,002
0,0025 0,0031 0,0039 0,0039 0,0049 0,0049 0,0063
Structural steel, alloyed,
quenched and subse-
drawn, up to 174,000 PSI
n
2.500
1.600
1.250
1.000
800
710
630
560
500
Oil
f
0,0013 0,0016 0,0020 0,0025 0,0031 0,0039 0,0039 0,0049 0,0049
Stainless steels up to
130,000 PSI e.g.,
X5CrNi18 10
n
2.000
1.250
1.000
800
630
500
500
400
400
Oil
f
0,0013 0,0020 0,0025 0,0031 0,0039 0,0039 0,0049 0,0049 0,0063
