AdrianH
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| posted on 12/8/13 at 06:15 PM |
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Stuck steel screw in aluminium help!
This is for a cover off a Yamaha 600CC chopper style bike, model not known, but came to me with a broken screw stuck in it.
Looks as though the aluminium has oxidized and bonded very well to the screw thread. The screw could well have been stainless it was hard to tell.
I have tried my usual welding a nut to the end and failed, in the end the screw finally snapped flush.
I have also drilled down with a clearance drill but cannot remove the remaining bits in the tread.
It is only a M6 thread, the aluminium is approx 8 or 9 mm thick and I have access to both sides, but struggling to remove the steel threads.
Is there something that will dissolve the steel but leave the aluminium that I can get over the counter without raising alarm bells?
Adrian
Why do I have to make the tools to finish the job? More time then money.
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02GF74
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| posted on 12/8/13 at 06:27 PM |
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There is a way similar to the electrolysis
I need to find the info but it will leavw al untiuched whilst dussilcing the steel
Sirr for slekkjbh usind android phibe
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teegray19
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| posted on 12/8/13 at 06:29 PM |
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Good quality stud extractor and a bit of heat will wip it out, I got a snapped head bolt out this way.
Or you could drill 6.8 and tap M8 if the application allows?
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rodgling
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| posted on 12/8/13 at 06:34 PM |
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Drill & helicoil?
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madteg
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| posted on 12/8/13 at 06:38 PM |
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Get some good drill bits, start with small drill say 3mm. drill up to 6mm very carefully making sure you stay central. then helicoil it
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Wheels244
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| posted on 12/8/13 at 06:39 PM |
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Spark erosion
I did it many moons ago when I was an apprentice to remove a snapped HSS Tap.
http://www.sparkeroding.co.uk/
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big_wasa
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| posted on 12/8/13 at 06:48 PM |
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quote:
Originally posted by rodgling
Drill & helicoil?
+1 if the oxidisation is that bad the thread may be no good anyway,
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AdrianH
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| posted on 12/8/13 at 06:58 PM |
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I will try to keep picking at it, try to get an edge and then bash-it.
All else fails then yes helicoil.
Adrian
Why do I have to make the tools to finish the job? More time then money.
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Mr Whippy
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| posted on 12/8/13 at 07:02 PM |
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Type M6 to M8 stud into google and that should give you a solution
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Wheels244
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| posted on 12/8/13 at 07:06 PM |
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quote:
Originally posted by AdrianH
I will try to keep picking at it, try to get an edge and then bash-it.
All else fails then yes helicoil.
Adrian
Agreed - maybe my solution was a bit exotic 
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owelly
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| posted on 12/8/13 at 08:10 PM |
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Soak it in vinegar to ease the fuzzy ali.
http://www.ppcmag.co.uk
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02GF74
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| posted on 14/8/13 at 06:46 PM |
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ALUM - Otherwise known as Potash of Alum or Potassium Ammonium Sulphate
read about it here:
http://www.tap-die.com/contents/en-uk/d296_Tip_Remove_Broken_Tap_Drill_Reamer_Tap_and_Die_Co.html
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