Guide
for Tapping Speed - GO BACK
to USER'S GUIDE
Effect & Limit the Speed of Tapping:
The materials of workpieces;the depth of hole (through
& blind hole); length of thread; pitch; thread percent;
lubricant; using equippment;vertical & horizontal
tapping.
How
to improve tapping speed:
Choose spiral flute tap; thread percent cut down; improve
quality of coolant;tapping small pitch thread.
Have
to decrease speed:
Thread length is longer; use blind hole tap; tapping
bigger pitch; to produce taper thread , the speed will
be decreased 1/4-1/2; poor coolant quality.
| Suggested Pipe Tap Drill sizes |
| Tap size |
1/16 |
1/8 |
1/4 |
3/8 |
1/2 |
3/4 |
1 |
1-1/4 |
1-1/2 |
2 |
2-1/2 |
3 |
3-1/2 |
4 |
Drill
size |
Taper tap |
D |
R |
11.11 |
14.68 |
17.86 |
23.42 |
29.37 |
38.1 |
44.05 |
56.36 |
66.68 |
82.55 |
95.25 |
107.95 |
| Cylinder tap |
1.81 |
8.73 |
11.11 |
14.68 |
29.76 |
23.42 |
29.37 |
38.1 |
44.45 |
56.36 |
67.47 |
|
|
|
Sizes given permit direct tapping without reaming the
hole, but only give a full thread for the first two
or three threads.
**For Dryseal Straight Pipe Threads suggested drill
sizes are as shown, expect; 1/4" pipe, use 11.28
drill size.
Selecting Standard Taps
When selecting standard taps,there are three basic factors
for you to consider:
1.The materials to be threaded.For optimum results,
select taps that are recommended for the material to
be threaded; two flute taps are recommended for some
materials in certain sizes and pitches and three, four
or six flute taps for other materials, sizes and pitches.
2.The type of the hole to be threaded.
An open or through hole - passes through the workpiece.
Plug chamfered taps are usually recommended for this
type of hole. When the material to be threaded produces
a continuous chip such as steel, aluminum, magnesium,
or a die casting, plug chamfered spiral pointed taps
are highly recommended for open or through holes for
diameters through 3/4".
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