CBN grades ideal for high-precision machining
Roughing to finishing continuous cut operations
Ideal for hardened materials of HRC 55 or higher
Features
- Mill hardened materials (HRC 45-62)
- Reduce costs and eliminate grinding
Tooling application
Hardened materials from HRC 45-62
Tool steels, Mold steels, Chilled irons, Powdered metal, Stellite welded overlays, etc.
Cutting conditions
| Insert | DOC(mm) | HRC 45-55 | HRC 55-60 | HRC 60-62 | |||
|---|---|---|---|---|---|---|---|
| Cutting speed(m/min) | Feed(mm/t) | Cutting speed(m/min) | Feed(mm/t) | Cutting speed(m/min) | Feed(mm/t) | ||
| RPGN1204 Type | 1.3 | 250 – 390 | 0.12 | 210-360 | 0.08 | 170-330 | 0.07 |
| RNGN1207 Type | 2.0 | 250 – 420 | 0.12 | 210-390 | 0.10 | 170-360 | 0.07 |
Note: Speeds and feeds are approximate starting points
Guidelines for Success
- Minimize overhang and have a rigid set-up
- Keep cutting engagement at 1/2 to 5/8 of the cutter diameter
- Reduce feed by 25% upon entrance and exit of the cut
- Use air blast, do not use coolant
- Use helical interpolation to ramp down into a cavity
- Increase feed rates in corners to compensate for heat loss
- Use climb milling
- Use shrink fit holders whenever possible
- Safety first – machine within recommended conditions
- As DOC gets smaller, speed should increase to compensate for heat loss
- Adjust speed to maximize plastic deformation
Tool lineup
| Geometry | Schnell part number | Corner R | Grade | Dimensions (mm) | |||
|---|---|---|---|---|---|---|---|
| Metric part description | Edge preparation | BW11 | BW51 | IC | Thickness | ||
 | RNGN 120700 | T00520 | ― | ● | 12.7 | 7.94 | |
| T00525 | ● | ||||||
| T00820 | ● | ||||||
| T01020 | ● | ||||||
 | RPGN 120400 | T00520 | ― | ● | 12.7 | 4.76 | |
| T01020 | ● | ||||||