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How to rebuild worn-out air grinder

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Leon K

12-04-2000 17:12:45




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I bought on ebay an Ingersoll Rand air grinder- big honker.

I put a few drops of oil in the air inlet and hooked it up to my big compressed air source, which is a 5 hp, 120 gal tank unit. Pressure is set at 90 psi.

The grinder spins up (slowly) and gets up to a pretty good speed, but it has very little torque. As soon as you put any pressure on it at all (I used a large knotted wire wheel), it slows down. It can be easily stopped by pushing into the work.

Air volume is no problem as I use this air source with many other air tools. Maybe it is designed for more psi??

This is obviously a very old, very used tool. Is there some seal or something that can cheaply be replaced to improve this? I know nothing of the inside of air tools.

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ltf in nc

12-05-2000 15:28:07




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 Re: how to rebuild worn-out air grinder in reply to Leon K, 12-04-2000 17:12:45  
The first thing you need to do is to determine the cfm and psi required to run the IR tool. Next you need to determine the output of your 5 hp compressor. When you locate this info repost your findings. I would wager that you have a miss match. Air grinder are notorious for air consumption. Many of IR grinders require up to 18 to 20 cfm to operate.



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RAW in IA

12-04-2000 19:22:39




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 Re: how to rebuild worn-out air grinder in reply to Leon K, 12-04-2000 17:12:45  
You say this is a big grinder. It might need a lager hose/connector. At work we use 3/8 hose but they only have 1/4" couplers. Restrict the air too much with only 90psi. I have used air tools ith larger couplers, and they work much better. Also turning up toe air will help. 90psi at the supply with nothing running turns into much less when you run the tool. Also, while you have it apart, check the end plates on the air motor. I have seen them scarred up and worn. I used to "machine" them down with a piece of fine sandpaper on a piece of glass or smooth worktable. Lay the piece flat on the paper and work it in a figure 8 pattern till it is smooth again.

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BFO

12-04-2000 17:36:53




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 Re: how to rebuild worn-out air grinder in reply to Leon K, 12-04-2000 17:12:45  
You should be able to unscrew the top to get to the vanes of the air motor. Pull out the motor, and clean the vanes. Sometimes they'll get stuck from emulsified oil or dirt or whatever. Also, check the bore that the vanes run in for scoring. The vanes themselves might be worn such that the don't seat anymore, allowing air to blow by, and reducing torque. While you have it apart, it'd be worthwhile to check and replace the bearings. Lightly oil when you reassemble, and it's a good idea to put a filter on the air supply.

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