| RPM =
(SFM x 3.82) divided by D |
D
= Diameter of Tap in inches |
|
| SFM =
(3.14 x D x RPM) divided by 12 |
D
= Diameter of Tap in inches |
|
Inch
Taps
Drill Size = Major Diameter of Tap
minus |
.01299
x % of Full Thread
#
Of Threads / inch |
|
Inch
Taps
% of Full Thread = Threads/in
x |
Major
Dia. of Tap minus Drill Diameter
.01299 |
|
Metric
Taps
Drill Size = Major Diameter of Tap
(mm) minus |
%
of Thread x Metric Pitch
76.98 |
|
Metric
Taps
% of Full Thread =
|
76.980
Metric
Pitch |
x (Basic
Major Diameter (mm) minus Drilled
Hole (mm)) |
|
| Form
Tap Drill Size = Basic Tap OD |
minus |
.0068
x % of Threads
Threads
/ Inch |
|
Inch
Taps
IPM (For Threads) = RPM divided by TPI
(Threads per Inch) |
Inch
Taps
IPR (For Threads) = 1 divided by TPI |
Inch
Taps
IPM (Inches Per Minute) = IPR x RPM |
Inch
Taps
IPR (Inches Per Rev.) = IPM divided by
RPM |
Metric
Taps
MM/Min = RPM x Metric Pitch |
Inch
Taps
In/Min = RPM divided by # of Threads /
in. |
| Distance =
Rate x Time |
|
