Calculators
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To get a feel for the relationship between the variables in machining calculations poke
in any combination of variables and play around with it.

Every good machinist needs to know the relationship of SFPM to Dia and RPM or Chip Load
to Feed Rate, RPM and Number of Teeth being used.


Surface Feet Per Minute

(SFPM) = (Pi * Diameter" * RPM) / 12

Diameter
(inches)

RPM

SFPM


Cutter Chip Load

(CL) = Feed Rate (Inches Per Minute) / RPM * Number of Teeth

CL

Feed Rate
Inches Per Minute

RPM

Number of Teeth


Inch to Millimeter Converter

.03936" = 1mm 25.4mm = 1"

Inches

Millimeters


Fraction to Decimal Converter

Use x / y form for fraction variable..... Hey old timer!
Try to think back to the days when you could not remember what 11/16 was in decimal form.
F for the young machinists it is a tool to get a feel for the decimal / fraction relationship.

(Millimeters are so much simpler!)

Fraction
Decimal