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Topic Review (Newest First)
07-21-2011 10:19 PM
tech69 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.
07-21-2011 11:16 AM
Hot Rod Mike
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.
07-20-2011 07:29 AM
boatbob2
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.
07-19-2011 08:13 PM
matts37chev
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
07-19-2011 06:53 PM
ogre
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.
07-19-2011 06:15 PM
oldred
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?
07-19-2011 06:06 PM
lowROLLERchevy 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.
07-19-2011 05:44 PM
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..

You can look at it anyway you want to... IT'S BEING LAZY !!!!

And when you try to take short cut's... Be ready for what happens....
07-19-2011 05:33 PM
oldred
Quote:
Originally Posted by NEW INTERIORS
Yea !!! your right.... But that doesn't change anything.... A drinker doesn't think he may drive home and kill someone either...I really don't think he intent to kill someone are wreak his truck into a tree either... But it happens...

Most short cut in life usually get you into trouble..


I think I basically said that already but you only quoted part of what I said!



Quote:
Originally Posted by Oldred
I think maybe most people don't just grab up a grinder with a cut-off wheel with the intent to use it for that purpose. Rather most cases of misuse are due to needing to knock down a nub or some other really small situation and the cut-off wheel is already being used or is what happens to be installed on the grinder at the time, STILL MIS-USE AND TOTALLY INEXCUSABLE
07-19-2011 04:31 PM
NEW INTERIORS
Quote:
Originally Posted by oldred
I think maybe most people don't just grab up a grinder with a cut-off wheel with the intent to use it for that purpose.


Yea !!! your right.... But that doesn't change anything.... A drinker doesn't think he may drive home and kill someone either...I really don't think he intent to kill someone are wreak his truck into a tree either... But it happens...

Most short cut in life usually get you into trouble..
07-19-2011 01:39 PM
Irelands child You do have to be careful with the flap wheels when grinding welds. Once the edges get well rounded, you can 'slip' off of the bead and end up grinding too much parent metal, creating waves.
07-19-2011 12:21 PM
oldred
Quote:
Originally Posted by Hot Rod Mike
No, I haven't tried them on grinding welds. I have used them for other reasons. I'll give them a try

Thanks,
Mike.

I usually use a 60 grit for grinding body panel welds and I have discovered that by using very light pressure I had less trouble with heat warping than anything I have ever used.
07-19-2011 12:16 PM
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.
07-19-2011 12:16 PM
Hot Rod Mike
flap discs ?

Quote:
Originally Posted by oldred
Have you tried flap discs? I have found nothing better for grinding welds than flap discs. Nothing beats flap discs for blending and they come in a wide variety of grits, personally I like the Zirconia grits best since they cut faster but they seem to heat the metal a little faster also (that may very well be more just imagination on my part however).
Oldred,

No, I haven't tried them on grinding welds. I have used them for other reasons. I'll give them a try

Thanks,
Mike.
07-19-2011 12:06 PM
oldred
Quote:
Originally Posted by Hot Rod Mike
I don't know of any other tool that can grind the welds as good as this, regardless of time.Mike.


Have you tried flap discs? I have found nothing better for grinding welds than flap discs. Nothing beats flap discs for blending and they come in a wide variety of grits, personally I like the Zirconia grits best since they cut faster but they seem to heat the metal a little faster also (that may very well be more just imagination on my part however).
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