# Machining time

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Machining time is the time when a machine is actually processing something. Generally, machining time is the term used when there is a reduction in material or removing some undesirable parts of a material. For example, in a drill press, machining time is when the cutting edge is actually moving forward and making a hole. Machine time is used in other situations, such as when a machine installs screws in a case automatically.

One of the important aspects in manufacturing calculation is how to find and calculate the machining time in a machining operation. Generally, machining is family of processes or operations in which excess material is removed from a starting work piece by a sharp cutting tool so the remaining part has the desired geometry and the required shape. The most common machining operations can be classified into four types: turning, milling, drilling and lathe work.

## Steps

### Drilling operation

Drilling time (T) can be calculated by the equation:[1]

${\displaystyle {\text{Drilling Time(T)}}={\frac {L}{f\times N}}}$

where;

${\displaystyle L}$ is the sum of hole depth approach and over travel distances

${\displaystyle f}$ is the feed (mm/rev)

${\displaystyle N}$ is the rotational speed (rpm)

## References

1. ^ White, W. T., Neely, J. E., Kibbe, R. R., Meyer, R. O. (1980). Machine Tools & Machining Practices