daviep
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| posted on 11/9/11 at 08:42 PM |
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quote:
Originally posted by adithorp
Look like Chinese knock offs to me. From what you can make out on the vid', the discs are pretty thick and cupped at the center like a grinding
disc. Cutting discs discs are flatter and not that thick. So if thats correct and the printing is dodgy along with dodgy quality... =counterfit?
I've had a dodgy batch of cutting discs in the past but they didn't explode, just broke up from the edge like very rapid wear.
Looks like a bog standard depressed centre 3mm cutting disc to me, the super thin 1mm or 1.6mm also come in flat centre or depressed.
EDIT: incorrect facts removed
[Edited on 11/9/11 by daviep]
“A truly great library contains something in it to offend everyone.”
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flak monkey
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| posted on 11/9/11 at 08:57 PM |
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My Norton 0.7mm discs are depressed centre, and probably the most resiliant cutting discs I have ever used.... done the whole floor in my Camaro with
one disc...
Discs/grinding wheels only break for 4 reasons:
Misuse
Incorrect mounting
Incorrect speed - usually too fast
Age - only on rubber or resin wheels though.
Sera
http://www.motosera.com
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Benzine
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| posted on 11/9/11 at 09:01 PM |
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quote:
Originally posted by flak monkey
My Norton 0.7mm discs are depressed centre, and probably the most resiliant cutting discs I have ever used.... done the whole floor in my Camaro with
one disc...
Impressive! I use decent 0.75mm discs from my local welding shop and they, too, have depressed centres. I'll look into Norton though as the ones
I use wear our rather quickly (and cost a bomb!)
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adithorp
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| posted on 11/9/11 at 09:12 PM |
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quote:
Originally posted by daviep
Looks like a bog standard depressed centre 3mm cutting disc to me, the super thin 1mm or 1.6mm only come in flat centre but 3mm discs can be flat or
depressed.
Could be, but look more like 5mm discs in the pack to me when he holds them up edge on. Yes, it says 3mm on the disc but if they are counterfiet then
that could be. Don't think I've ever noticed what look like cracks around the hub on new discs, before like those have.
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
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ReMan
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| posted on 11/9/11 at 09:26 PM |
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Mine was bought from Machine mart in the last month
www.plusnine.co.uk
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daviep
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| posted on 11/9/11 at 09:50 PM |
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quote:
Originally posted by adithorp
quote:
Originally posted by daviep
Looks like a bog standard depressed centre 3mm cutting disc to me, the super thin 1mm or 1.6mm only come in flat centre but 3mm discs can be flat or
depressed.
Could be, but look more like 5mm discs in the pack to me when he holds them up edge on. Yes, it says 3mm on the disc but if they are counterfiet then
that could be. Don't think I've ever noticed what look like cracks around the hub on new discs, before like those have.
Still think it looks exactly like what it claims to be, the cracks around the hub are 100% normal in my experience.
Davie
“A truly great library contains something in it to offend everyone.”
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flak monkey
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| posted on 12/9/11 at 07:46 PM |
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quote:
Originally posted by Benzine
quote:
Originally posted by flak monkey
My Norton 0.7mm discs are depressed centre, and probably the most resiliant cutting discs I have ever used.... done the whole floor in my Camaro with
one disc...
Impressive! I use decent 0.75mm discs from my local welding shop and they, too, have depressed centres. I'll look into Norton though as the ones
I use wear our rather quickly (and cost a bomb!)
You can get them from Screwfix, about £8.50 for 5
http://www.screwfix.com/p/flexovit-ultra-thin-metal-cutting-discs-pack-of-5/71334
Just gentle pressure, more cutting under their own weight
Sera
http://www.motosera.com
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MikeRJ
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| posted on 12/9/11 at 07:54 PM |
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quote:
Originally posted by flak monkey
Vitrified wheels dont have a shelf life and will keep indefinately. This is the sort of wheels you have on your bench grinder.
I seem to recall from my apprentice days that even vitrified grinding wheel age and have a finite shelf life, but it's quite long (10 years
maybe?).
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flak monkey
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| posted on 12/9/11 at 07:58 PM |
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I'll check tomorrow with our grinding wheel rep, but I am pretty sure vit wheels are good indefinately if stored under normal conditions.
Sera
http://www.motosera.com
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FASTdan
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| posted on 20/9/11 at 02:12 PM |
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quote:
Originally posted by adithorp
Look like Chinese knock offs to me. From what you can make out on the vid', the discs are pretty thick and cupped at the center like a grinding
disc. Cutting discs discs are flatter and not that thick. So if thats correct and the printing is dodgy along with dodgy quality... =counterfit?
I've had a dodgy batch of cutting discs in the past but they didn't explode, just broke up from the edge like very rapid wear.
I bought a pack of clarke metal cutting discs with depressed center from machine mart. They were absolutely crap, wore out within 20% of the normal
'industrial' cutting discs I've used in the past. They also made a horrendous amount of dust.
NEW danST WEBSITE NOW LIVE! Bike carbs, throttle bodies and more......
http://www.danstengineering.co.uk/
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NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
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TimC
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| posted on 20/9/11 at 03:03 PM |
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From my own experience, it is reasonably common for a manufacturer to carry out due-diligence to extend the shelf life on an item, particularly when
prompted by an impending write-off.
It could easily be a 'legitimate' change in shelf life; one would therefore hope that the manufacturer would hold documentary evidence to
prove that the materials were adequately tested and safe to use.
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