manufacturing


 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Engineering, Design, and Manufacturing Knowledge

Calculation of machining time

Machining time inclusive of setting up the machine, getting the tools, study of drawing. The actual Machining time taken and measuring & checking.

 

Turning operation


turning Machine time = length to be machined / Feed rate

Longitudinal turning - ( rpm known )
l = length to be machined
Sr = Feed rate
n = rpm
Machine Time = l / Sr x n


Longitudinal turning - ( rpm unknown )
d = Diameter
v = Cutting speed
Sr = Feed rate
l = Length to be machined
Machine time = l x pi x d / Sr x v

Facing
Machine time = r / sr x n

 

Drilling operation
drill

Machine time = length of tool traveled / Feed rate
Machine time ( Known rpm )
L = length of tool travel ( l + 0.3 d )
S = Feed rate
Sr = Feed per revolution
n = rpm
d = Diameter of drill
Machine Time = L / Sr x n


Machine time - ( rpm unknown )
L = length of tool travel ( l + 0.3 d )
V = cutting speed
Sr = Feed per revolution
n = rpm
d = Diameter of drill
V= pi x d x n / 1000
n=Vx1000/Pi x d
Machine time = l x pi x d / Sr x v x1000

 

Milling operation
milling

Machine time = length of tool traveled / Feed rate
machine time = L / s