Re: tap and stud extraction tips, please

Posted by Wayne Swenson on June 22, 2005 at 13:26:51 from (66.228.226.15):

In Reply to: tap and stud extraction tips, please posted by Kevin Brooks on June 22, 2005 at 11:35:08:

You can use a Oxy-Acetylene cutting torch to "burn" the broken bolt or thread tap out of the casting. The casting has so much mass that it doesn"t have time to get hot enough for the oxygen stream to burn. Just don"t heat on the casting itself or you can melt it also.
The broken bolt/tap should be heated red/white hot and then hit the oxygen lever. GENERALLY the bolt only will be burned out leaving an empty bolt hole. Many sparks will blow back out of the hole so be sure to use eye protection. A #5 lens will do the trick. The torch tip may get temporarily covered with molten metal and necessitate shutting down the flame to clean the tip.
Take your time and be careful. Get that container of used oil, old rags, etc. out of the way and have at it.

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