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  #31 (permalink)  
Old 07-19-2011, 06:06 PM
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I have yet to have a cutting wheel come apart on me, but i did have a grinding stone come apart on me once, and I've had a BUNCH of the 40 grit sandpaper discs for air grinders come apart.

I got REALLY lucky when the stone exploded. I was picking up the grinder, hit the trigger on accident and it started to shake. I intentionally buried the wheel into the table as I let of the trigger. Probably made the wheel explode quicker, but the chunks sure were going A LOT slower when they plowed into my fingers and my leg.

Idiot coworker came over and told me "oh i dropped that one earlier, it needed a new wheel"

Thats what i get for not checking out a community tool before plugging it in.

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  #32 (permalink)  
Old 07-19-2011, 06:15 PM
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Quote:
Originally Posted by NEW INTERIORS
Well !!! I only quoted that part because you looked like you where making a excuse towards what I was trying to say about being lazy..


How the dickens do you get that idea?
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  #33 (permalink)  
Old 07-19-2011, 06:53 PM
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Quote:
Originally Posted by dinger
Just a small addition, be careful when you set the tool down. I never leave the tool setting on the disc, I carefully set it on it's back, ... snip
funny you should mention this: i usually just turn off the grinder and plunge it into to any workbench near by to stop the wheel. never had a problem...

hotrodmike:
i'm actually going to try your idea. i assume you use just the edge. i too, use a cut off wheel on edge to cut down mig welds. stacking them might work better.

new interiors:
quit baiting oldred he never backs down, even when he's wrong.

i use 6'' cutoff disks in a 4'' grinder. i throw away the guard when it comes out of the box. i buy harbor freight grinders so i can have 3 available at any given time. yes they are junk, but i rarely buy more than one per yr. i buy harbor freight grinders for the price of 3 cutoff disks, bought 3 yesterday @ $14.95 ea, 1 for me, 2 for my neighbor who is as cheap as me. knock-on-wood, i've never had a disk fly apart. jammed and broke, yes. dropped and broke, yes. pinched and broke, yes. fly apart and hurt me, heck no.
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  #34 (permalink)  
Old 07-19-2011, 08:13 PM
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Quote:
Originally Posted by oldred
Ok, I'm going to highjack my own thread.


I notice that Black&Decker and DeWalt both have "Extended service" grinding discs and cut-off discs that are supposed to last a lot longer, I may be off a bit but I think they claim better than a 50% increase in service life? Have any of you guys compared these things and if so do you think they are worth the extra cost? I usually just pay the extra cost and buy them instead of the standard discs but honestly are they really worth it? I really can't say I see any difference in them but since I just do hobby work anymore I just don't use any of them enough to make any kind of meaningful assessment.
right now i have a whole stack of -DeWalt 4 1/2" .045 "high performance" cut off discs and they seem to be very good
I bought them at Lowes, they were cheaper if you bought 25 or more
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  #35 (permalink)  
Old 07-20-2011, 07:29 AM
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breaking discs...

Hi,i have broken those HF discs,just ask me about the 7 stitches in my left hand. DO NOT use them to grinding,,,they are for cutting metal ONLY.
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  #36 (permalink)  
Old 07-21-2011, 11:16 AM
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cut off wheels

[QUOTE=ogre]hotrodmike:
i'm actually going to try your idea. i assume you use just the edge. i too, use a cut off wheel on edge to cut down mig welds. stacking them might work better.

Ogre,

Yes, I usually have Norton 4 or 5 inch wheels, & I think they are approx. 0.039 inch wide. Stacking 3 of these together & using the edge only greatly reduces the time to grind the welds down. I picked this tip up on Metalmeet forum several years ago from a trusted source, so I went w/it. I do have safety equipment on my body (gloves, eye & hearing protection), so I guess I'm as prepared as I can be

Mike.
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  #37 (permalink)  
Old 07-21-2011, 10:19 PM
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I use a cutt off wheel to clean up welds but I do it very carefully and my welds penetrate good and aren't rough. I'm not trying to cut into the metal behind the welds so I'm carefully doing it with both hands. I can't picture it exploding unless I'm cutting thru something and bend the wheel. I just don't see it happening unless my welds are jagged boogers that didn't penetrate or I was drunk. I've seen them break but the ones I get have a net fabric over the top so it doesn't shatter and it has only done that when cutting.

As for a 4.5" angle grinder and using a cutt off wheel for welds I wouldn't know. If your welds are good it's kind of overkill but can imagine a bigger disk with rpm's like that could have some issues.
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