resume

2.
Machining Turning operation
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
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
Machine time = length of tool traveled / Feed rate machine time = L / s

Calculate Time for Turning

Calculate Time for Boring

Calculate Time for Drilling

Calculate Time for Facing

Calculate Time for Knurling

Calculate Time for Tapping

Calculate Time for Threading

Number Of Cuts for Internal Threads = 32 x Pitch

Number Of Cuts for Internal Threads = 25 x Pitch

1.
Cutting Speed(CS) of a material is the ideal number of Feet-per-Minute that the tool-bit should pass over the work-piece. This "Ideal" cutting speed assumes sharp tools and flood coolant. Adjustments need to be made for less than ideal cutting conditions. Different materials (High-Carbon/Low-Carbon Steels, Aluminums, Different kinds of Plastics) have different Cutting Speeds and can be worked/cut at different rates. In addition, some tools or processes (like threading, knurling, or cutting-off) will need to be worked at slower speeds than the Cutting Speed would indicate.
Feed Rate(Lathe) refers to how fast a lathe-tool should move through the material being cut. This is calculated