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Description
of HeliCoil® and Installation Process |
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HeliCoil®
Inserts are designed as positive means for protecting
and strengthening all tapped threads. They are
reinforced internal threads of cold rolled 18-8
stainless steel, with hardness far in excess
of the usual tapped materials. |
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Typical
Applications include: Automotive,Commercial
Vehicles,Plant Machinery, Marine Engines, Aerospace
& Aviation, Military and all types of machinery.
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There
are over 300,000 HeliCoil® inserts used in each
747 Jumbo Jet. |
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Once the HeliCoil® is fitted it
will not move. It is secured by Radial Pressure
exerted by the coils on the thread flanks.
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This
Radial pressure is accomplished by the outside
diameter of the HeliCoil® being larger by a calculated
amount than the hole into which it is to be installed. |
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Shown
here on the left are some of the
specialist drills used to extract
broken studs and bolts.
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| Explanation
of Repairing Stripped Threads
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Using the appropriate HeliCoil®
Tap. The stripped thread will be tapped
to sufficient depth to accommodate the insert
length of the bolt, stud or screw that is
to be used. |
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After the hole has been tapped
the HeliCoil® is inserted |
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using precision
tools to ensure a perfect fit |
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Pictured left is a example of a
damaged screw thread from an exhaust
manifold. This will require to be
Drilled, Tapped and a Helicoil inserted. |
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Explanation
of Broken Bolt / Stud Removal in Situ
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Most broken bolts or studs or spark
plugs can be removed in situ either by drilling and
extracting or by extracting without drilling or in
some cases Drilling out completely and repairing the
original thread or replacing it with a HeliCoil® thread.
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Pictured left is a typical example
of what can happen with spark plugs.
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Explanation
of Broken Drills, Taps & Extractor Removal
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Broken Drills, Taps, and Extractors
can be removed by an engineering process known as SPARK
EROSION. This process requires that the work piece
to be removed from the vehicle or machinery, i.e.. Cylinder
head removed from the Vehicle. |
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This application of EDM
using a continuously moving fine wire as the cutting
tool. The wire is electrically charged and cuts through
the work piece by spark erosion, vaporizing & melting
the work piece instead of mechanically cutting. |
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As the
wire never physically touches the work-piece there is
no mechanical stress. |
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This is the equipment used for the Spark
Erosion process. |
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