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Recommended TAP tapping speed feed & lubricant for aluminium brass bronze copper iron alloy plastic by The Tap & Die Co, London, UK
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There are many variables that can affect tapping speeds - experiment to find the ideal.
A good rule is to start at a slow speed and work up to a faster speed
Tapping speeds (RPM=Revs per minute) can be calculated:-
RPM = Feed speed (SFM) divide by 0.26 x tap OD(outside dia)
Tapping speeds are determined by many factors, main ones being:
a) thread pitch
b) material being tapped
c) depth of thread
d) hole depth
e) hole type: ‘through’ or ‘blind’
f) lubricant quality and flow rate
Tapping speeds should be decreased if:-
a) ‘bottom’ lead is used or ‘spiral-flute’ taps are used
b) lubricant is poor, or flow is restricted
c) thread depth percent increases
d) thread pitch is coarse
e) if cutting ‘taper-threads’ (50 percent normal speed)
f) if cutting ‘Acme’ or ‘Trapezoidal’ threads (40 percent normal speed)
Tapping speeds can be increased if:-
a) thread depth decreases
b) thread pitch is fine
c) coolant flow and quality is good
d) spiral-point taps are used
The Tap and Die Company website has a lot of other very useful 'Technical’ Data & Information for you to view
