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Removing Stripped Alen Nut"?


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#1 ranchruler@yahoo.com OFFLINE  

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Posted July 09, 2014 - 09:41 AM

how do you remove a stipped allen nut then is down inside of a pulley.


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#2 VintageIronCollector OFFLINE  

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Posted July 09, 2014 - 10:08 AM

how do you remove a stipped allen nut then is down inside of a pulley.


I would try putting some lubricant on it if it's rusty and letting it set about a week or so. Some people weld metal on to the tops of bolts when they are stripped and you might be able to do the same thing here but I'm not positive because I've never tried it before. Maybe you could even use a very strong epoxy like JB Weld if it's down in too far to weld it. Wait and see what other people recommend first because I am not totally sure.

#3 Alc OFFLINE  

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Posted July 09, 2014 - 10:32 AM

Would you be able to grind an easy-out to fit ?



#4 JDBrian OFFLINE  

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Posted July 09, 2014 - 10:49 AM

Got any pictures. Without seeing it I'd say try to drill it out, starting with a small bit and working up to one that just clears the sides of the threads in the pulley.



#5 olcowhand ONLINE  

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Posted July 09, 2014 - 11:18 AM

I have had to drill them out before.  They pretty much self-align the bit, being there is already a centered hole in the allen set screw.  Whatever size allen that's in there, find the size tapping drill bit for that size.  It will take out the allen, l;eaving only it's threads in the pulley threads.  Once drilled out, remove the pulley, then chase the threads with appropriate tap.

  By the way, just put the drill bit down to the side of the pulley flange touching the shaft, then put a piece of tape on the drill at the top edge of the flange on the drill so you will know how deep to drill. 


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#6 LilysDad OFFLINE  

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Posted July 09, 2014 - 11:55 AM

Those allen screws are usually pretty hard. I tend to strip the allen wrench first. Someone on here(Nato77? or maybe glgrumpy?) just used a dremel grinder to grind through a stripped screw.



#7 Sawdust OFFLINE  

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Posted July 09, 2014 - 12:53 PM

I've always used Olcowhands method with good success. Let us know how you do with pics  :D



#8 Nato77 OFFLINE  

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Posted July 09, 2014 - 01:25 PM

I've used a torx bit before to remove a stripped allen head bolt. Sometimes you might have to tap it down into it pretty hard to get it to grab. Lots of penetrating oil and time always helps.
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#9 HANKG OFFLINE  

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Posted July 09, 2014 - 02:52 PM

I have had to drill them out before.  They pretty much self-align the bit, being there is already a centered hole in the allen set screw.  Whatever size allen that's in there, find the size tapping drill bit for that size.  It will take out the allen, l;eaving only it's threads in the pulley threads.  Once drilled out, remove the pulley, then chase the threads with appropriate tap.
  By the way, just put the drill bit down to the side of the pulley flange touching the shaft, then put a piece of tape on the drill at the top edge of the flange on the drill so you will know how deep to drill.

Just replaced all bearings in my simplicity deck three allens were stripped on pulley's the above advise is spot on get yourself a couple of good hard bits and have at it use a little wd40 to cool your last bit size should be just under 1/4 follow up with 1/4 inch tap
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#10 Traill95 ONLINE  

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Posted July 09, 2014 - 07:40 PM

I have had to drill them out before.  They pretty much self-align the bit, being there is already a centered hole in the allen set screw.  Whatever size allen that's in there, find the size tapping drill bit for that size.  It will take out the allen, l;eaving only it's threads in the pulley threads.  Once drilled out, remove the pulley, then chase the threads with appropriate tap.

  By the way, just put the drill bit down to the side of the pulley flange touching the shaft, then put a piece of tape on the drill at the top edge of the flange on the drill so you will know how deep to drill. 

I spent over thirty years in maintenance shops and this is the best method. :thumbs:



#11 KennyP OFFLINE  

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Posted July 09, 2014 - 07:45 PM

Never heard of an 'allen nut' before!


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#12 Bruce Dorsi OFFLINE  

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Posted July 09, 2014 - 08:01 PM

Left-hand spiral drill bits in a reversible drill work great. 

 

Often the heat created while drilling, plus the "un-screwing" rotation, will unscrew the set screw without having to drill all the way through.


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#13 Texas Deere and Horse OFFLINE  

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Posted July 09, 2014 - 08:04 PM

Never heard of an 'allen nut' before!

 

I haven't either, but know a guy named Alan that's quite the "nut"

 

:rolling: :rolling: :rolling: :rolling: :rolling:


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#14 KennyP OFFLINE  

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Posted July 09, 2014 - 08:07 PM

I haven't either, but know a guy named Alan that's quite the "nut"

 

:rolling: :rolling: :rolling: :rolling: :rolling:

I think that is more like a 'nutcase'! Anyway, I know what allen bolts are. Just haven't ever in 45 years heard of an allen nut!


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#15 Texas Deere and Horse OFFLINE  

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Posted July 09, 2014 - 08:07 PM

I have had to drill them out before.  They pretty much self-align the bit, being there is already a centered hole in the allen set screw.  Whatever size allen that's in there, find the size tapping drill bit for that size.  It will take out the allen, l;eaving only it's threads in the pulley threads.  Once drilled out, remove the pulley, then chase the threads with appropriate tap.

  By the way, just put the drill bit down to the side of the pulley flange touching the shaft, then put a piece of tape on the drill at the top edge of the flange on the drill so you will know how deep to drill. 

 

 

Left-hand spiral drill bits in a reversible drill work great. 

 

Often the heat created while drilling, plus the "un-screwing" rotation, will unscrew the set screw without having to drill all the way through.

 

In the 40+ years of working in machine/ fabrication shops, we have had great success with both of these methods.






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