Re: Heli Coil

Posted by janicholson on April 08, 2005 at 08:37:09 from (199.17.6.175):

In Reply to: Heli Coil posted by Charles Park on April 08, 2005 at 07:46:45:

If your drilling efforts are very centered in the broken bolts, I mean within about 1/32" or less than a mm) and streight (perpendicular to frame) then I would use progressively larger drill bits to enlarge the hole until there is only the threads left. This requires several drills and patience, as well as a hand magnifier to be sure you are looking at the beginnings of the threads usually on one side, due to being a bit off center. Next is to dose the hole with penetrating oil and heat the casting with 1 or 2 propane or mapp gas torches to get it to ~ 250 degrees. Then using a sharp pic tool (dental type)get under a thread and start working it out like a spring. This leaves original threads (run a good tap in them, and they are where they belong!!
Heli coil is used when the internal threads are gone (excess drilling, or pulled threads). If there is a need to heli coil, the frame will need to be removed to allow the appropriate larger drill to be used (before removing be sure to pre drill with a bushing in the frame hole to get the helicoil drill centered perfectly).
JimN

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