BGS technic 1927 Mode D'emploi page 3

INSTRUCTIONS
Please read and follow these instructions to reach a proper threading and
longer tool-life. Taps and dies are tools of high precision. They are produced
from high-quality alloy steel, heat treated and tempered for a hardness of 58-61
HRC. Check the hardness of your workpiece before starting thread-cutting by a
regular machinist's file. In case the workpiece can be easily filed, you may
proceed with your thread-cutting.
Taps (for internal threads)
•
To cut an internal thread, select a proper drill-size as per the table shown
below, the tap of the desired size and tap-wrench.
•
The proper hole-size is very important in the formation of good threads. An
oversized hole results in reduced thread-high an undersized hole will
overload the tap and will probably cause damage of the tool or even the
workpiece.
•
Select a tap with the required size. Included in the set are for each thread
size a taper tap (1 ring), a second tap (2 rings) and a finishing tap (without a
ring), which are to be used in that order for fabricating a thread.
•
Secure the tap by the square in the tap-wrench
•
Fix the workpiece in a bench-vise or by using clamps and start threading by
turning the wrench in clockwise direction. Great care must be taken to start
the tap square to the hole. As the tap is turned it bites into the metal and
leads into the hole.
•
After the tap has been started, the metal-chips that flow into the flute
spaces must be broken to relieve pressure on the tap. This is accomplished
by reversing the tap-direction every 1/4 to 1/2 revolution depending on the
tightness encountered. Providing lubrication to the cutting edges while
tapping will result in smoother threads and longer tap-life.
•
Continue threading until the tap passes through the workpiece or it reaches
the bottom of the hole.
•
When tapping a blind hole (one that does not pass entirely through the
workpiece) take care in drilling to provide clearance at the bottom for metal-
chips and the starter-threads. These chamfered threads on the end of the
tap will not cut full threads
BGS technic KG
Bandwirkerstr. 3
D-42929 Wermelskirchen
Tap and Die Set
Tel.: 02196 720480
Fax.: 02196 7204820
mail@bgs-technic.de
BGS 1927
1925
www.bgstechnic.com
© BGS technic KG, Copying and further use not allowed
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