Cutting speed VC

The cutting speed (VC) is the instantaneous velocity of a point on the cutting edge in the main direction of motion relative to the surface to be machined.

Notes:

VC: Cutting Speed (m / min)

N: spindle speed (rev / Min)

D: workpiece diameter (mm)

FORMULA:

VC=πXDxn/1000(m/min)

Influence of cutting speed on tool life

The single most significant factor determining tool life

Excessive cutting speed:

  • rapid flank wear
  • Poor surface quality
  • Rapid Crescent depression wear
  • plastic deformation

LOW CUTTING SPEED:

  • SCURF tumor
  • Poor economy.

Feed F

Feed Rate F is the displacement of the tool relative to the workpiece in the direction of feed motion.

Notes:

F: Feed per revolution (mm / Rev)

L: cutting length per minute (mm)

N: spindle speed (REV / Min)

FORMULA:

F=l/n(mm/rev)

Influence of feed rate on machining

The single most significant determinant of productivity

Excessive feed rate:

  • No chip control
  • Poor surface quality
  • Crescent depression wear and plastic deformation
  • High Power consumption
  • Chip Fusion
  • Chip impact.

LOW FEED RATE:

  • long chips
  • Poor economy.

Calculation of cutting time of outer circle and inner hole

Notes:

T: Cutting Time (Min)

L: Length of the part to cut (mm)

N: spindle speed (REV / Min)

Calculation formula;

T=l/f*n(min)

Calculation of end face cutting time (constant linear speed)

Notes:

T: Cutting Time (Min)

VC: Cutting Speed (M / min)

F: Feed (mm / REV)

When there is no internal hole in the cut end face, B0

FORMULA:

T=π*（a2-b2）/4000XVcXf(min)

Influence of cutting depth

Cutting too deep:

  • High Power consumption
  • Blade Rupture
  • higher cutting force

TOO SMALL DEPTH OF CUT:

  • No chip control
  • vibration
  • overheating
  • Poor economy.