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MODULHARD’ANDREA
Technical Data
Recommended Cutting Conditions for Roughing Operations with Double-Bit Heads - TS
Material
boring bar
dimensions
working
conditions
cutting speed Vc = SFM
feed fn = inch/rev (twin cutters)
Diameter
insert radius
D < 1.5 D = 1.5 - 4.75 D > 4.75 R = 0.008 R = 0.016 R = 0.032
carbon steel
Rc < 20
carbon steel
Rc > 20
stainless steel
AISI 304 - 316
L / d = 2.5 good 390 - 585 455 - 650 520 - 810 -- -- .012 - .020
L / d = 4.0 normal 325 - 520 390 - 585 455 - 650 -- -- . 012 - .020
L / d = 6.3 difficult 230 - 325 230 - 325 230 - 325 .006 - .012 .008 - .016 --
L / d = 2.5 good 325 - 520 390 - 585 455 - 650 -- -- .012 - .020
L / d = 4.0 normal 260 - 455 325 - 520 390 - 585 -- -- .012 - .020
L / d = 6.3 difficult 195 - 290 230 - 325 230 - 325 .006 - .012 0.008 - .016 --
L / d = 2.5 good 260 - 360 290 - 390 325 - 455 -- -- .012 - .020
L / d = 4.0 normal 230 - 325 260 - 360 290 - 390 -- -- . 12 - .020
L / d = 6.3 difficult 195 - 290 195 - 290 195 - 290 .006 - .012 .008 - .016 --
L / d = 2.5 good 290 - 390 325 - 455 390 - 520 -- -- .012 - .020
cast iron
L / d = 4.0 normal 230 - 325 290 - 390 325 - 455 -- -- .012 - .020
L / d = 6.3 difficult 195 - 290 195 - 290 195 - 290 .006 - .012 .008 - .016 --
L / d = 2.5 good 520 - 810 650 - 975 810 - 1140 -- -- .016 - .024
aluminum
L / d = 4.0 normal 455 - 650 520 - 810 650 - 975 -- -- .016 - .024
L / d = 6.3 difficult 325 - 490 325 - 490 325 - 490 .008 - .016 .012 - .020 --
Twin cutters at the same cutting diameter
cutting depth
ap = inch
working range
Ø = inch
steel
max. cutting depth (ap)
cast iron, aluminum
.71 - 1.10 .06 - .08 .08 - .10
1.10 - 1.97 .08 - .12 .10 - .14
1.97 - 2.68 .12 - .16 .14 - .20
2.68 - 7.87 .16 - .20 .20 - .28
7.87 - 19.69 .20 - .24 .24 - .31
Twin cutters at different cutting diameter
152
It’s advisable to start with B hole > the boring bar diameter d.
NOTE: For boring operations at different diameters, reduce to a
half the feed indicated on the above table.