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Tool Talk Discussion Forum

Angle grinders

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Bill V in Md

06-06-2004 08:45:12




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Why do most electric angle grinders have a male threaded connection, whereas pneumatic angle grinders have a collet type connection? I would like to buy a pneumatic grinder and attach a cup brush grinder, but it looks like I will need some type of adaptor because they all have a female threaded connection. Should you not use these wire brushees with penumatic grinders?..... ...Bill V.




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John in MA

06-07-2004 19:09:21




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 Re: Angle grinders in reply to Bill V in Md, 06-06-2004 08:45:12  
I think the air "angle grinders" you're thinking of right right-angle die grinders. Real air angle grinders use normal threaded studs. Very different purposes.



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T_Bone

06-07-2004 07:36:18




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 Re: Angle grinders in reply to Bill V in Md, 06-06-2004 08:45:12  
Hi Bill,

I use a 4" wire wheel with a 1/4" arbor on my air die grinder for patching tubes and tires. Hard to get engough torque to run the brush adquotely and for a good reason. Too much RPM and the wires fly off really fast. Full face shield with eye protection and long sleaves is required.

You need to watch the RPM rating match on using a cup wire brush on side grinders. It will burn out a cheap side grinder because of the torque demand of the brush.

The twisted wire cups last longer than the straight wire cups but are worth the extra cost.

A 7" Milwaukee side grinder with a 5" twisted wire cup works well. Even here you need to watch run time for too much heat build up on the grinder head.

T_Bone

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Fred OH

06-08-2004 06:39:56




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 Re: Re: Angle grinders in reply to T_Bone, 06-07-2004 07:36:18  
You forgot to mention that you also occasionally have to pull those little wires out of your tummy...running at those speeds when they fly off, they got a head of steam up. And, their dangerous to use cause they'll grab and jump over into your shirt and try to eat it...with you in it, no less! I have a story about them from years gone by. Fred OH



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T_Bone

06-09-2004 06:46:40




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 Re: Re: Re: Angle grinders in reply to Fred OH, 06-08-2004 06:39:56  
Hi Fred,

You got that right. I had a co-worker that his arm was bothering him pretty bad. Docs x-rayed it several times and couldn't find out why.

6mths latter he's rubbing it and out pops a single wire. The wire had been setting on top of the bone and every time he moved the arm it would scratch the bone.

T_Bone



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Fred OH

06-10-2004 08:14:01




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 Re: Re: Re: Re: Angle grinders in reply to T_Bone, 06-09-2004 06:46:40  
Guys are telling that working around fibreglass, the new thing for sending signals through lines...that if that stuff gets inside the human body...you can't find it with an xray...bad news! Fred OH



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T_Bone

06-10-2004 08:58:41




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 Re: Re: Re: Re: Re: Angle grinders in reply to Fred OH, 06-10-2004 08:14:01  
Back when I was a apprentenice we had a 3M guy come around to tell us all about the fiberglass duct liners.

His demo was to "eat" a ball of fiberglass and then boldly state:

"see it ain't gona hurt you"

We then asked him how long he had this job, "two years" how long did the other guy have the job; "two years"...lol he didn't get it

T_Bone



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Ron

06-06-2004 09:03:19




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 Re: Angle grinders in reply to Bill V in Md, 06-06-2004 08:45:12  
I'm pretty sure they don't want you do swap them as the speeds are very different and you might end up with pieces of wire flying off. Me, I'd stick with the tools that are made for the job.



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Van in AR

06-06-2004 17:05:53




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 Re: Re: Angle grinders in reply to Ron, 06-06-2004 09:03:19  
That is the reason, wire cup brushes are not ment to be ran a 20,000 rpm plus. They would fly apart and would not balance well at that speed. Its all fun and games until somebody loses a eye!
Van



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Brian G. NY

06-06-2004 09:00:44




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 Re: Angle grinders in reply to Bill V in Md, 06-06-2004 08:45:12  
There are cup brushes with holes for mounting. I use one on my big angle grinder; don't know if the shaft on my 4" grinder is long enuf, never tried it.



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