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Circle offers two grades of Cubic Boron Nitride (CBN) inserts
for distinctly different applications. CBN is not as hard as diamond, but remains stable
under high temperature conditions when machining super alloy materials and/or hardened
steels. Excellent for high speed finishing in nickel based alloys, cobalt based alloys,
ni-hard cast iron, and powder metals. Significant productivity increases can be expected
as well as close tolerances and excellent surface finishes when using Circle CBN grades
as recommended. Can be used with or without coolant. Cubic Boron Nitride (CBN) provides
excellent performance in the machining of ferrous workpiece materials and is especially
effective when used to machine materials with hardness ratings from 45 to 70 Rockwell
C.
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CBN-1 Machining Group Reference for Ni-Hard Cast and Chilled White Iron |
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MG# |
Material Description |
Hardness |
Grade Selection |
SFM |
MPM |
|
4 |
Ni-Hard Cast Iron
Chilled White Iron |
50-60 RC
54-60 RC |
CBN1 |
200 - 600 |
61 - 183 |
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5 |
Pearlitic Gray Iron |
220-240 BHN |
CBN1 |
1500 - 3000 |
457 - 914 |
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Darker areas are CIRCLE'S primary insert grade recommendations
and surface speeds for the material shown. Insert grades shown in the lighter areas,
reflect secondary choices. Machining speeds, feeds, and depth of cuts are considered
to be "safe" starting conditions. |
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CBN-6 Machining Group Reference Chart for Heat Treated and Tool Steel |
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MG# |
Material Description |
Hardness |
Grade Selection |
SFM |
MPM |
|
12 |
Tool Steel |
45-55 RC
55-65 RC |
CBN6 |
300-600
200-400 |
91 - 183
61 - 122 |
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17 |
Nickel Base Alloys |
45-55 RC |
CBN6 |
200-500 |
61 - 152 |
|
18 |
Inconel 600
Inconel 718
Rene 41
Rene 95 |
45-55 RC |
CBN6 |
200-500 |
61 - 152 |
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19 |
Cobalt Based Alloys
Stellite |
45-55 RC |
CBN6 |
200-500 |
61 - 152 |
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26 |
Heat Treated Alloy |
45-55 RC
55-60 RC |
CBN6 |
300-600
200-400 |
91 - 183
61 - 122 |
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Darker areas are CIRCLE'S primary insert grade recommendations
and surface speeds for the material shown. Insert grades shown in the lighter areas,
reflect secondary choices. Machining speeds, feeds, and depth of cuts are considered
to be "safe" starting conditions. |
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Machining Conditions using CBN-1 Tipped Tnserts
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Circle
|
Inch
|
Metric
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Insert
|
Depth of Cut
(Per Side)
|
Feed Rate
(IPR)
|
Depth of Cut
(Per Side)
|
Feed Rate
(MMPR)
|
|
ABD 09 |
0.0005" - 0.002" |
0.001" - 0.0005" |
0,013 - 0,051 |
0,025 - 0,013 |
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ABD 125 |
0.0005" - 0.003" |
0.001" - 0.0005" |
0,013 - 0,076 |
0,025 - 0,013 |
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ABD 156 |
0.001" - 0.003" |
0.003" - 0.0005" |
0,025 - 0,076 |
0,076 - 0,013 |
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ABC TYPE |
0.001" - 0.003" |
0.004" - 0.001" |
0,025 - 0,076 |
0,102 - 0,025 |
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CDCD-5 |
0.001" - 0.010" |
0.005" - 0.001" |
0,025 - 0,254 |
0,127 - 0,025 |
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TDAB-5 |
0.001" - 0.009" |
0.004" - 0.001" |
0,025 - 0,229 |
0,102 - 0,025 |
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TPCB-2 |
0.001" - 0.045" |
0.015" - 0.001" |
0,025 - 1,245 |
0,381 - 0,025 |
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TD-6P |
0.001" - 0.060" |
0.015" - 0.001" |
0,025 - 1,524 |
0,381 - 0,025 |
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As Depth of Cut increases...Feed Rate ...decreases.
SFM = Surface Footage per Minute. / MPM = Meters Per Minute.
I.P.R. = Inches Per Revolution. / MMPR = Millimeters Per Revolution
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Machining Conditions using CBN-6 Tipped Inserts
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Circle
|
Inch
|
Metric
|
|
Insert
|
Depth of Cut
(Per Side)
|
Feed Rate
(IPR)
|
Depth of Cut
(Per Side)
|
Feed Rate
(MMPR)
|
|
ABD 09 |
0.0005" - 0.002" |
0.001" - 0.0005" |
0,013 - 0,051 |
0,025 - 0,013 |
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ABD 125 |
0.0005" - 0.003" |
0.001" - 0.0005" |
0,013 - 0,076 |
0,025 - 0,013 |
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ABD 156 |
0.001" - 0.003" |
0.003" - 0.0005" |
0,025 - 0,076 |
0,076 - 0,013 |
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ABC TYPE |
0.001" - 0.008" |
0.004" - 0.001" |
0,025 - 0,203 |
0,102 - 0,025 |
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CDCD-5 |
0.001" - 0.010" |
0.005" - 0.001" |
0,025 - 0,254 |
0,127 - 0,025 |
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TDAB-5 |
0.001" - 0.009" |
0.004" - 0.001" |
0,025 - 0,229 |
0,102 - 0,025 |
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TPCB-2 |
0.001" - 0.045" |
0.015" - 0.001" |
0,025 - 1,143 |
0,381 - 0,025 |
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TD-6P |
0.001" - 0.060" |
0.015" - 0.001" |
0,025 - 1,524 |
0,381 - 0,025 |
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As Depth of Cut increases...Feed Rate ...decreases.
SFM = Surface Footage per Minute. / MPM = Meters Per Minute.
I.P.R. = Inches Per Revolution. / MMPR = Millimeters Per Revolution
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