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Neil Wyatt08/03/2017 17:06:53
18992 forum posts
734 photos
80 articles

One of my steplad's is changing the back box on his Combo van. I volunteered to grind a rusted nut off the clamp (in the end I went through the clamp itself).

I changed to a cutoff wheel, started up and WHACK! the wheel split right across, a big lump belted the back of the van and shot back across the drive.

I was wearing goggles but he wasn't, luckily it missed him by a couple of feet.


MW08/03/2017 17:14:05
2051 forum posts
51 photos

Cut off wheels always make me nervous of that, and now demonstrably with good reason!

I only have a few tiny ones with a dremel and they have a tendency to do just that. (But much less drastically, I still wouldn't fancy one in my eye though)

I started using them without safety glasses(more like scuba diving style goggles, due to my need to wear glasses of the ocular variety) until it occurred to me that it would probably be a good idea.

Michael W

Edited By Michael-w on 08/03/2017 17:16:52

ASF08/03/2017 17:22:14
131 forum posts
12 photos

That will teach you for volunteering... smiley

daveb08/03/2017 18:10:06
626 forum posts
10 photos

Angle grinder?? what sort of cut off wheel? Most have a fibrous stucture, if you really abuse them, the edge can get a bit ragged but I've never known one to split. The hard cut off discs sold for use with Dremel type tools are not suitable for hand held use, they shatter, use the fibrous ones instead.

clogs08/03/2017 18:25:30
626 forum posts
12 photos

how was it mounted ? U know there are two ways for the ring nut to mount the stone/cutting disc.........

the deep side with the step is for the thick grinding disc's and the reverse ie flat side is for yjr thin cutting disc's.....

mind u there are some cutting disc's that are NOT flat, they have a similar dished profile to the heavy grinding disc's

U probably know this already ?????

I only use St/St cutting disc's now as they out last the norm one's and I get thru at least 1x9" disc per week, the problem u've had has never happened to me.....

be careful out there...........


Neil Wyatt08/03/2017 18:28:48
18992 forum posts
734 photos
80 articles

This was a proper fibrous metal cutting wheel, but a Dremel one about 3" diameter for tehir small angle grinder. I think I must have cracked it getting it out of or into the case (it had been used previously, but i swapped it out for a wood/plexiglass carbide wheel) but no damage was visible.

Must say that with a new wheel on it was much easier to work in the small space than a traditional grinder and olknly marginally slower. My only criticism is that it can be challenging to get discs in and out of the 'too clever for its own good' storage case.


Ady108/03/2017 19:26:45
5067 forum posts
734 photos

I got one of these a few years ago for doing dodgy jobs

Comes in handy now and then

Sam Longley 108/03/2017 19:37:46
939 forum posts
34 photos

When I had my building business I used to buy 9 inch cut off blades & stone cutting discs ( for wall chasing) by the 1000 for cost reasons. So I have used a few over the years & never had one shatter. The type I used to buy always came with paper washers to spread the fit of the clamping nuts. People tend not to bother & I have not seen this in later years.

Last year I was cutting some chain by standing on the links each side of the one to cut. Someone spoke to me , I looked up. The chain slipped , I had cut one half of the 19mm link. The 9 inch blade shattered & a couple of the bits over 1 inch across shot 30 feet across the yacht club dinghy park & fortunately missed everyone nearby. A piece stuck in my trouser leg but missed my leg.

I was amazed at the damage & the way the blade , A thin pattern , shattered.

I have since gone back to the thicker pattern blades

peak408/03/2017 19:41:53
1675 forum posts
179 photos

For those of you with a Facebook account, here's an example of why one should wear safety glasses.

Don't worry it's not gory, unlike one I was with a chap sporting 1/2 a cutting disk sticking out of his chin.


I use something similar to the one Ady1 mentioned, but also have one of the old "Bubble" visors which clips to the front of an open face motorcycle helmet. I mounted it on the headband from a redundant welding mask so it flips up when not in use. Thick impact resistant plastic, so hopefully should be pretty strong, and resembles one of these.



Gordon W09/03/2017 09:14:12
2011 forum posts

I've used hundreds of the things and never had a breakage in normal use. I mostly now use thin discs in 4 1/2" grinder nowadays. One thing to watch is the hole in the middle of disc, very rarely one is a bit tight on the spindle nut and can crack when tightened up, throw it away.

Ian S C09/03/2017 10:44:11
7468 forum posts
230 photos

A while bach I was at the local stainless steel fabrication shop to get some TIG welding done. While my job was being done, the apprentice was given the job of cutting a piece out of some stainless sheet, so in with the angle grinder--BANG shattered the disc, replace disc, off he goes again--Bang, gone done it again, boss comes out to see whats going on, I got out of the road while a bit of a lecture went on about remember what you were taught about grinding, one of those situations where you know someone is approaching the job in the wrong way, but it's not your place to intervene. The weld on my job failed too.

Ian S C

Thor 🇳🇴09/03/2017 10:50:46
1602 forum posts
45 photos

Well Neil, I guess the two of you were lucky. As mentioned by others I always wear a face shield when using the angle grinder (and hearing protection of course). I don't want to end up like the guy in Bill's link.


larry Phelan09/03/2017 11:12:13
544 forum posts
17 photos

I always regard angle grinders and their discs as I do mothers-in-laws,with great respect,since both are quite likely to explode when least expected,and for no obvious reason.

I do use grinders,but I am always wary of those thin cut off discs,one is tempted to use them to grind off that little of junk,rather than change the disc [we,ve all done it ]

You were lucky,dont push it ! no body looks well with a disc sticking out of their head,well,very few anyway.

Neil Wyatt09/03/2017 11:52:29
18992 forum posts
734 photos
80 articles
Posted by clogs on 08/03/2017 18:25:30:

the deep side with the step is for the thick grinding disc's and the reverse ie flat side is for yjr thin cutting disc's.....

Only one way to mount the disc on thii one, it isn't a standard angle grinder. The split never came closer than 5mm to the securing disc.


Tony Pratt 109/03/2017 12:23:13
1930 forum posts
12 photos

I'm always amazed by the builders/block pavers who use angle grinders without any form of protection, stupid is not really a strong enough word.


vintagengineer09/03/2017 14:07:57
468 forum posts
6 photos

They are builders, not the brightest of tradesmen.

Posted by Tony Pratt 1 on 09/03/2017 12:23:13:

I'm always amazed by the builders/block pavers who use angle grinders without any form of protection, stupid is not really a strong enough word.


Andy Ash09/03/2017 14:11:56
136 forum posts
33 photos
Posted by vintagengineer on 09/03/2017 14:07:57:

They are builders, not the brightest of tradesmen.

Posted by Tony Pratt 1 on 09/03/2017 12:23:13:

I'm always amazed by the builders/block pavers who use angle grinders without any form of protection, stupid is not really a strong enough word.


I think most of them use diamond discs for ceramics.

The threat is slightly different with diamond cutting discs I'd say.

That they're using diamond probably shows they're smarter than most!

Martin Connelly09/03/2017 15:01:07
2123 forum posts
222 photos

The diamond disks still produce dust, grit and larger pieces that can rebound off surfaces. You need a dust mask, goggles and hearing protection when using them.


Zebethyal10/03/2017 09:27:55
198 forum posts

I was once using one of those segmented diamond cutting disks in my 6" angle grinder to cut a tile or something similar, for whatever reason, the disk caught on something and shattered throwing one of the segments directly at my fingers, fortunately I was wearing my welding gloves and it simply bounced off, it still gave my fingers one hell of a belt though, without the gloves I would almost certainly have lost some fingers.

I was also wearing goggles, hearing protection and a respirator style dust mask, I am seriously contemplating a face shield for future use though.

not done it yet10/03/2017 09:47:10
6736 forum posts
20 photos

They don't have designated trained changers of abrasive wheels for no good reason?

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