
| BR Ge | ometry | BF Geometry | |
| Best Choices for Insert and Grade Selection | |||
| �First choice �Alternate choice | |||
| Grade | TN7535 | TN2510 | TN2505 |
| Roughing Operation | � | � | |
| Finishing Operation | � | � | |
| Low RPM Machine | � | � | |
| Flat Areas or Face Milling (≤10° inclination) | � | � | |
| Hard Machining | � | � | |
| Unstable and/or Long Overhangs | � | � | |
| HSM or 5-Axis Machining (smaller ap/ae values) | � | � |
| It is important to consider the effective | When machining inclinations between | ||
| diameter (Deff) when using light depths | 11° and 55°, further modifi cation of vc | ||
| of cut in order to properly calculate RPM | is required. Apply factor “k” from the | ||
| values. Use the following formula when | given formula to calculate the correct | ||
| α | |||
| machining fl at surfaces or inclinations | vc (vceff). This corrected value is then | ||
| of 10° or less to fi nd the Deff value, | used to calculate the proper RPM for | ||
| Ap1 | |||
| and then use this for RPM calculations | the tool. | ||
| as opposed to using the overall insert | |||
| diameter (D1). | |||
| D | D | ||
| eff | eff | ||
| D | D | ||
| 1 | 1 | ||
| 1 | |||
| k = | ] [α |
Deff 2-(D1-2Ap1)2 sin + arcCos (1-(2 (Ap1/D1)))
v eff = v X k c c Starting Values for Semi-Finishing in Common Material Types (L/D ratio <3 x D1) M270 is usually applied for semi-fi nishing and fi nishing operations; Ap1/ae conditions depend on the operation. As a general rule: Ap1/ae )0,05D.
Tool Diameter
Ø10 Ø12 Ø16 Ø20 Ø25 Ø32
| Tool Di | amete | r | ||||||||||||||||
| Ø10 | Ø12 | Ø16 | Ø20 | Ø25 | Ø32 | |||||||||||||
| max (m | rec. m) | fz (mm/ | max (m | rec. m) | fz (mm/ | max (m | rec. m) | fz (mm/ | max (m | rec. m) | fz (mm/ | max (m | rec. m) | fz (mm/ | max (m | rec. m) | fz (mm/ | |
| Material | Ap1 | ae | tooth) | Ap1 | ae | tooth) | Ap1 | ae | tooth) | Ap1 | ae | tooth) | Ap1 | ae | tooth) | Ap1 | ae | tooth) |
| Soft Steel | 0,7 | 0,7 | 0,2 | 0,8 | 0,8 | 0,2 | 1,1 | 1,1 | 0,27 | 1,3 | 1,3 | 0,27 | 1,7 | 1,7 | 0,3 | 2,1 | 2,1 | 0,3 |
| High-Strength Steel 33–44 HRC | 0,5 | 0,5 | 0,15 | 0,6 | 0,6 | 0,2 | 0,8 | 0,8 | 0,25 | 1 | 1 | 0,25 | 1,3 | 1,3 | 0,25 | 1,6 | 1,6 | 0,25 |
| Hardened Steel 44–55 HRC | 0,3 | 0,3 | 0,15 | 0,4 | 0,4 | 0,2 | 0,5 | 0,5 | 0,22 | 0,7 | 0,7 | 0,22 | 0,8 | 0,8 | 0,25 | 1,1 | 1,1 | 0,25 |
| Grey Cast Iron GG25… | 1 | 1 | 0,2 | 1,2 | 1,2 | 0,25 | 1,6 | 1,6 | 0,25 | 2 | 2 | 0,25 | 2,5 | 2,5 | 0,3 | 3,2 | 3,2 | 0,3 |
| Nodular Cast Iron GGG60… | 0,7 | 0,7 | 0,2 | 0,8 | 0,8 | 0,25 | 1,1 | 1,1 | 0,25 | 1,3 | 1,3 | 0,25 | 1,7 | 1,7 | 0,3 | 2,1 | 2,1 | 0,3 |