What do the numbers mean in the following formula to calculate machining power?

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Eduardo Bonome

The numbers in the formulas you provided are conversion factors and constants used to simplify the calculation of machining power. Here’s a breakdown of what each number signifies:

60: This is used to convert minutes to seconds, as you correctly noted.

75: This factor is often used to convert the power from watts to kilowatts (since 1 kW = 1000 W) and to account for the efficiency of the machine. It can also be related to the specific units used in the calculation, such as converting from metric to imperial units.

1.36: This factor is used to convert horsepower to kilowatts. Specifically, 1 horsepower is approximately equal to 0.7457 kW, and 1.36 is a rounded factor used in some machining power calculations to simplify the conversion.

102: This factor is used to convert the cutting force from Newtons to kilograms-force (kgf). Specifically, 1 kgf is approximately equal to 9.81 N, and 102 is a rounded factor used to simplify the conversion in some contexts.

So, the formulas you mentioned are essentially different ways to account for unit conversions and machine efficiency in the calculation of machining power. The specific factors used can vary depending on the conventions and units preferred in different regions or industries

My dear Pushkar, for me it is also not clear, a possibility as mentioned is that it is taking into account somehow the efficiency of the machine. I did some research but no success. If I get to find something else I will let you know.