A most Un-cooperative SOB tonight !

mmcmdl

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Walked into a emergency job tonight . Broken 3/8-16 grade 8 bolt broken in an extruder pump flange . So far , made up a centering bushing jig , broken off 2 split point cobalts , finally got thru the bolt , then broke off one of my Irwin extractors . I have never broken one in the past 43 years ! 2 hours into it , I still have a broken bolt but have a nice pretty hole thru it . :mad:

I instructed the operator to take the temp up to 550 and I'll be back . If that don't work , the "heat wrench " is coming out . If that don't work , it's down to the EDM machine on Monday after dis-assembly of the whole friggan thing . :surrender:
 
Don't sound like grade 8 to me.....
 
No luck with the bolt with the heat applied so it's out of my hands from this point on . I can't work on it with the other side of the machine running . :finger wag:
 
Not enough of a nub to weld a nut to? Can do even blow grade....to an extent.
 
Nope , that bolt is in there Mike . They broke it trying to remove it . I drilled it out on center with a 3/16" drill with a bushing rig I made up . Broke 2 drills in the process . Then I snapped my easy out in 2 . The bolt kept on shearing and I'm now down to almost flush . It may need to be drilled out to the full .257 diameter but the machine is running now . ( opposing mandral side ) . Want some pics ?
 
Left hand bit?
 
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