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Tool Talk Discussion Forum

removing 1/2 moon key

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paul

10-20-2005 13:57:44




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How the _heck_ does one get a buggered up 1/2 moon key out of a shaft? Fer crying out loud.

I had to cut the cast iron pulley off with a recip saw, it had wallowed around, and the pulley actually spun a 1/4 turn, locking the 1/2 moon key somewhere in the middle of the pulley.

Now the buggered up 1/2 moon is sitting there looking at me, nothing left to grab on to, typically pull them out with a pinchers, or pound them down on one side, come up & out on the other.

This one, nothing there to grab any more, I have holes drilled it it, smashed on it with a hammer & punch - not moving.

Rather important beearing is a couple inches away, it's a $1000 shaft & fan combo on my combine, so I can't get too rough with it. Just want that little bit of metal to disappear is all.

Grrrrr. Been a long day. Parked the combine last night when the belts broke & saw the pulley was bad; when I got on the ground could hear air - big tire was shot too. Tomorrow it rains & snows, here I sit looking at iron on a beautiful sunny day.

--->Paul

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JMS/MN

10-21-2005 08:53:12




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 Re: removing 1/2 moon key in reply to paul, 10-20-2005 13:57:44  
Sent you an email with the same msg- candle wax and heat. Did that same shaft on the M2 two days ago- heat alone, it would not budge. Waxed while cooling, popped right out.



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RickL

10-21-2005 04:15:37




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 Re: removing 1/2 moon key in reply to paul, 10-20-2005 13:57:44  
Airhammer simple as that.



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JMS/MN

10-20-2005 21:15:59




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 Re: removing 1/2 moon key in reply to paul, 10-20-2005 13:57:44  
4 times tried to respond- nothing appears- you have my addy- send email.



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JMS/MN

10-20-2005 21:22:40




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 Re: removing 1/2 moon key in reply to JMS/MN, 10-20-2005 21:15:59  
fifth time and the msg disappeared1



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fixerupper

10-20-2005 20:04:59




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 Re: removing 1/2 moon key in reply to paul, 10-20-2005 13:57:44  
Last fall my neighbor had the same problem. He had done all the beating with a hammer and punch he could do with no results. I came over to his place with my air hammer with a small punch bit and rattled it right out in a few seconds. I won"t print the word he used before he thanked me. Jim



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paul

10-20-2005 20:07:22




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 Re: removing 1/2 moon key in reply to fixerupper, 10-20-2005 20:04:59  
That is on my list of items to get someday. :)

--->Paul



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Ken Crisman

10-20-2005 20:02:47




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 Re: removing 1/2 moon key in reply to paul, 10-20-2005 13:57:44  
Spray it good with Blaster & let it soak a day or so . Then nead it with a small punch & hammer . Using a dremel may cause damage to the shaft & I don't think you want to do that . Ken



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Hermit

10-20-2005 17:52:48




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 Re: removing 1/2 moon key in reply to paul, 10-20-2005 13:57:44  
Have you thought about using a Dremel tool? Maybe use a small cutoff wheel to grind down through the key. Or a small burr to grind away the key. Either way, it may take a while.



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RayP(MI)

10-20-2005 19:53:51




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 Re: removing 1/2 moon key in reply to Hermit, 10-20-2005 17:52:48  
I second a Dremmel tool - if you don't have one get one! That and a few cutoff tools, carefully applied, and you can grind the piece out and reshape the groove to fit a new key. Did that with one a while back. It was virtually welded in the groove. A few minutes and a handful of cutoff disks, and I had a new groove cut just to fit the new key. Make sure you have new key in hand, and cut groove to fit. Cutoff wheels are fragile, so you may well go thru a handful on your project.

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Ralph - Ohio

10-21-2005 06:17:19




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 Re: removing 1/2 moon key in reply to RayP(MI), 10-20-2005 19:53:51  
Regarding Dremel cut off wheels - the originals are indeed very fragile. There are other slightly larger diameter wheels reinforced with some sort of fiber that last much longer. I have never broken one of those.



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RayP(MI)

10-20-2005 19:50:15




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 Re: removing 1/2 moon key in reply to Hermit, 10-20-2005 17:52:48  
I second a Dremmel tool - if you don't have one get one! That and a few cutoff tools, carefully applied, and you can gring the piece out and reshape the groove to fit a new key. Did that with one a while back. It was virtually welded in the groove. A few minutes and a handful of cutoff disks, and I had a new groove cut just to fit the new key. Make sure you have new key in hand, and cut groove to fit. Cutoff wheels are fragile, so you may well go thru a handful on your project.

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Bob/Ont

10-20-2005 20:01:32




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 Re: removing 1/2 moon key in reply to RayP(MI), 10-20-2005 19:50:15  
When you get a big chunk ground out of the center of the key, try pounding it again. It may loosen from the heat of grinding and the material removed.
Later Bob



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Paul

10-20-2005 20:05:28




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 Re: removing 1/2 moon key in reply to Bob/Ont, 10-20-2005 20:01:32  
Will try that in the morning. Really, really wanted to start using the sledge this late afternoon, so went & did some other pressing work - I've learned when it's time to walk away for a little bit. ;)

--->Paul



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acnky

10-20-2005 14:06:27




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 Re: removing 1/2 moon key in reply to paul, 10-20-2005 13:57:44  
Possibly tap threads into one of your holes you have drilled, use as jackbolt? or, if you can heat the shaft try candle wax.



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JoeK

10-20-2005 18:43:17




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 Re: removing 1/2 moon key in reply to acnky, 10-20-2005 14:06:27  
I remodeled a small punch into a small chisel a couple years back,allowed me to get under one end and jack it out...just regrind it slowly and quench often to preserve temper...or buy a tiny chisel(3/16 or so)



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lucasss

10-20-2005 19:56:39




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 Re: removing 1/2 moon key in reply to JoeK, 10-20-2005 18:43:17  
i have taken pin punch and drove it down on one end of key lifting up the other end of the key.



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