(Example) rotation speed of spindle is 1350min-1 and drill bit diameter isφ2, calculate cutting speed.
(Answer) integrateπ=3.14，D1=12，N=1350 in the formula;
Therefore, derive that cutting speed is 50.9m/min
◆.Feed of spindle( vf ):
vf=fr·n (mm/min)
vf(mm/m)
: Feeding speed (Z-axis) of spindle
fr (mm/rev)
: Feed per revolutions
n (min-1)
: Rotation speed of spindle
(Example)Feed per revolution is 0.2mm/rev and rotation speed is 1350min-1,calculate feeding speed of spindle.
(Answer) integrateπ=3.14，D1=12，N=1350 in the formula;
vf=fr×n = 0.2 ×1350=270 mm/min
From here, it is derived that feeding distance of spindle is 270mm/min
◆.Hole machining time( Tc )
Tc(min)
: Machining time
n (min-1)
: Rotation speed of spindle
Id(mm)
: Depth of drilled holes
fr(mm/rev)
: Feed per revolution
I
: Number of hole
(Example) Drill bit a hole ofφ15 and 30mm deep in SCM440 steel,
cutting speed is 50m/min, and feed per revolution is 0.15mm/rev. Calculate cutting time.
