They are talking about Heli-Coil inserts. The insert is a metal wire, with a
diamond cross-section (thread form), coiled into what looks like a
tightly-wound spring. What you do is drill out the damaged threads, to a
specific size. Then, using a special Heli-Coil tap, you tap the hole to fit
the insert. Using a special tool, the Heli-Coil insert is then installed
into the hole. You then have a hole that takes the original sized bolt.
Usually, this "repair" is stronger than the original threads. But you must
have enough depth (thickness) for the Heli-Coil to install correctly. These
inserts are widely used in aircraft/military hardware, where you need strong
threads in aluminum or other soft metals. -Bill
>Date: Sun, 27 Dec 1998 15:07:20 PST
>From: Michael Clark <markiiidakota@hotmail.com>
>Subject: Re: DML: RE: New Member and a Question
>
>>I think after time the
>>coiled hole would be weakened and could really mess up the hole.. Just
>my
>>thoughts....
>
>Could someone tell me what a coiled hole is? I know what a drill and
>tap means but I can't figure this coil thing out. Thanks.
>
>- ---Dummy, near Houston.---
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