Calculation of cutting parameters and symbols used in turning

① Turning, milling, drilling, boring, grinding, reaming:

Vc=d×π×n/1000(m/min)

Vc=(d×π×n)/(1000×60)(m/s)

In the formula, d——workpiece or tool (grinding wheel) diameter (mm)

n——Workpiece or tool (grinding wheel) revolutions per minute (r/min)

②Planing and inserting

Vc=L×(1+V planing stroke/V empty stroke)×n/1000=(5/3)×L×n/1000=0.0017×L×n(n/min)

Or use the following formula:

VC=n×L×(1+m)/1000(n/min)

In the formula, L—— planing stroke ^ length (mm)

n——Number of reciprocating times per minute (times/min)

m-generally take 0.7 (because the return journey must be fast)

①n=Vc×1000/(π×d)=(Vc×3)×1000/d(r/min)

②n=Vc×1000×3/(5×L)=Vc/(0.0017×L) (two-way number/min)

Where: d——workpiece or tool diameter (mm)

L-stroke length (mm)

Vf=af×Z×n(mm/min)

In the formula: af——feed per tooth (mm/z)

Z-number of tool teeth

n——revolutions per minute (r/min)

①f=vf/n(mm/r)

②af=f/Z(mm/z)    

①ap=(dw-dm)/2

②Drilling ap=dw/2

Where: dw——diameter to be processed (mm)

dm——diameter of machined surface (mm)

Symbols used in turning:

tj-maneuvering time (min)

L-cutter stroke length (mm)

1-processing length (mm)

11-cutting length of cutter (mm)

12——The cutting length of the cutter (mm)

13——Additional length for test tool (mm)

i——Number of passes

ap-depth of cut (mm)

f——feed amount (mm/r)

n-spindle revolutions per minute (r/min)

d——The diameter of the workpiece blank (mm)

d1——Minimum diameter of workpiece aperture or special-shaped surface (mm)

d2——outer diameter of workpiece (mm)

Vc-cutting speed (m/min)

P-lead or pitch of thread (mm)

D-cone diameter (mm)

d3-diameter of the small end of the cone (mm)

Lk-the length of the busbar on the cone side (mm)

g-number of threads