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The Following are the Codes Used in the Formulas:

TCM = Time Cutting in Minutes

TCS = Time Cutting in Seconds  

IPM = Inches per Minute Feed Rate

MRR = Metal Removal Rate (Cubic Inches Per Minute)

L = Length of Cut

W = Width of Cut

D = Depth of Cut

F = Feed Rate in Inches Per Minute


To Calculate the Time Cutting in Minutes (TCM) use the Following Formula:

TCM (Time Cutting in Minutes) = L ÷ IPM (Length of Cut ÷ Inches Per Minute Feed Rate)

Example:

You have a cut of 17.5 Inches Long at a Feed Rate of 22.0 Inches Per Minute

17.5 ÷ 22.0 = .7955 Minutes or 47.73 Seconds (.7955 x 60 = 47.73 Seconds)


To Calculate the Time Cutting in Seconds (TCS) use the Following Formula:

TCS (Time Cutting in Seconds) = (L ÷ IPM) x 60

(Length of Cut ÷ Inches Per Minute Feed Rate x 60)

Example:

You have a Cut of 24.38 Inches Long at a Feed Rate of 37.25 Inches Per Minute

24.38 ÷ 37.25 = .6545 Minutes x 60 = 39.27 Seconds


To Calculate the Length of Cut Based on the Time of taken for the cut, use the Following Formula:

L (Length of Cut) = IPM x TCM (Inches Per Minute x Time Cutting in Minutes)

Example:

You have a Cut that Takes 3.978 Minutes at a Feed Rate of 20.0 Inches Per Minute

20.0 x 3.978 = 79.56 Inches Length of Cut


To Calculate the Metal Removal Rate in Cubic Inches Per Minute (MRR) use the Following Formula:

MRR (Metal Removal Rate) = W x D x F (Width of Cut x Depth of Cut x Feed Rate in Inches Per Minute)

Example:

You are Making a Cut that is .500 Wide, .375 Deep and the Feed Rate is 20.0 Inches Per Minute

.500 x .375 x 20.0 = 3.75 MRR (Metal Removal Rate in Cubic Inches Per Minute)


Metal Removal Rate Formulas:

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All of the Metal removal Rate Calculations can be easily done in the Web Machinist Software Program’s Metal Removal Calculators Module (below) Available Here