<VV> RE: Sheared Bolts, Taps

[Brown, Douglas T CIV NAVAIR DEPT]

Harry, you might try dissolving the bolt by chemical means (nitric acid), or EDM (electric discharge machining).  EDM works especially well on harder metals like broken taps.  The following link has some discussion on these methods.  I've seen a web article on making your own EDM, but I couldn't find it now.  Hope this helps.

Toby Brown
http://yarchive.net/metal/tap_remove.html
Plans to build your own EDM:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3810443831&category=25281

At 04:06 PM 4/22/2004, Harry Yarnell wrote:
>Its happened again; snapped off bolts. I've tackled this before, never
>satisfied that the approach I used was the best (removal of the 'remains').
>I've tried solvents (PB blaster, etc), heat (torch), and drilling
>with/without Easyout. Heat and beeswax. What are YOUR successful methods?
>BTW, these are two steel bolts into an aluminum transaxle at the motormount
>of a FWD Coupe Deville.
>
>Harry Yarnell
>perryman garage and orphanage
>perryman, MD
>hyarnell1@earthlink.net