Machining Formulas

(Check out our Feeds and Speeds page fore milling and turning formulas)


Inch to Metric

#/25.4

# * .03937

Drill Size for Metric Tap (Download Drill Chart)

Diameter-Pitch= Drill Size

Example: m8x1.25

8-1.25= 6.75mm= drill size for M8x1.25 tap

Drill Size for Inch Tap

Diameter- Pitch= Drill Size

Example: 1/2-13

13 threads per inch….1/13= .0769

.0769= Pitch

.5-.0769=.4231= Drill size

Distance from Drill shoulder to tip

(Basic rule can be specific per angle of drill)

Diameter of drill * .3 (This is what I personally use for all drills)

OR more specifically

Drill Point Angle:

60 Degree = 0.866 X Drill Diameter = Drill Point Length

82 Degree = 0.575 X Drill Diameter = Drill Point Length

90 Degree = 0.500 X Drill Diameter = Drill Point Length

118 Degree = 0.300 X Drill Diameter = Drill Point Length

120 Degree = 0.288 X Drill Diameter = Drill Point Length

135 Degree = 0.207 X Drill Diameter = Drill Point Length

 

 

 

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