Calculate the Spindle Speed by (a) HSS tool (b) Carbide Tool

Calculate the spindle speed (N) if a C 20 steel job of 50 mm dia is to be turned by (a) HSS tool and (b) Carbide Tool.

Solution

(a) D = 50 mm

From table above

The cutting speed for C 20 steel V_c = 40 m/min

We know

V _c = π DN/1000 m/min

N = (V_c × 1000 )/ π D = (40 × 1000 )/ π × 50= 254.54 rpm

∴The spindle speed should be N = 254.54 rpm when an HSS tool is used.

(b) D = 50 mm; V_c = 150

V _c = π DN/1000 m/min

N = (V_c × 1000 )/ π D = (150 × 1000) / π × 50= 954 rpm

∴The spindle speed should be N = 954 rpm when an carbide tool is used.

Table 7: Cutting Process Parameters for Turning