Cutting Parameters
Spindle speed and feed rate to set on the machine from the tool catalogue's cutting speed and feed, plus metal removal rate and approximate cutting power.
Spindle speed n1,273rpm
- Feed rate V_f
- 255 mm/min
- Metal removal rate Q
- 80 cm³/min
- Approx. cutting power P_c
- 2.67 kW
- Theoretical peak-to-valley R_t = f² / 8r_ε
- 6.3 µm
- Theoretical R_a ≈ R_t / 4
- 1.56 µm
METHOD
How it is calculated
n = 1000 · V_c / (π · D) Turning: V_f = f · n Q = V_c · a_p · f Milling: V_f = f_z · z · n Q = a_p · a_e · V_f / 1000 P_c ≈ Q · k_c / 60 000 R_t = f² / (8 · r_ε)
ASSUMPTIONS & NOTES
- Typical V_c (carbide): structural steel 180–250, stainless 120–180, cast iron 150–250, aluminium 300–1000 m/min. HSS about one fifth of that.
- Typical k_c: steel 1800–2200, stainless 2400–2800, cast iron 1100–1500, aluminium 600–900 N/mm².
- Allow for spindle efficiency (75–85 %) when checking machine power.
Results are for preliminary design and checking; base the final design on the governing standard and safety factors.
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