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Author: Subject: Are all grinding wheels the same?
v8kid

posted on 21/10/16 at 05:03 PM Reply With Quote
Are all grinding wheels the same?

Just bought a new 200mm grinder from screwfix and the vibration is hellish.
Fiddles about with the grinding wheels and got it a little better but still bad.
The blessed wheels are neither concentric or running true - they wobble both axially and radially.
So are there better replacement wheels to buy?

Any "names" to go for?

Cheers





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dave_424

posted on 21/10/16 at 05:25 PM Reply With Quote
Keith Fenner did a good set of videos on an issue like this - granted he is a machinist with all the tools. It could just be dodgy nuts or spacers that are sending the wheels out of true.


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rusty nuts

posted on 21/10/16 at 05:26 PM Reply With Quote
I have a 6" bench grinder with a Machine Mart wheel which is wearing very quickly with loads of dust, I won't be buying another from them .
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David Jenkins

posted on 21/10/16 at 05:34 PM Reply With Quote
My bench grinder came with a crummy wheel when I bought it (probably from Machine Mart, but not sure). The difference when I replaced it with a brand-name wheel from a reputable supplier was simply astonishing. The replacement was much heavier, smoother (even though it was nominally the same grit) and felt more solid. It ran smoothly as soon as I started it up.

The reason I changed it was because my then employer had recently shown us a film about what happens when a bench grinder wheel explodes, although they were talking about why you shouldn't abuse a wheel, not because of buying a second-rate one.



[Edited on 21/10/16 by David Jenkins]






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matt5964

posted on 21/10/16 at 06:23 PM Reply With Quote
We sell lots of different types but the branded is what makes a difference to quality and longeverty, you really do get what you pay for

https://www.cromwell.co.uk/shop?query=Grinding

3m and Siam abrasives or norton are very popular in industry's





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rgb247

posted on 21/10/16 at 06:37 PM Reply With Quote
Agree with the above, 3M discs are probably the best. Try the Cubitron 2 wheels, best i've tried.
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gremlin1234

posted on 21/10/16 at 08:19 PM Reply With Quote
grinding wheels can be 'dressed' which helps with balance, but I agree good quality ones are better


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owelly

posted on 21/10/16 at 09:20 PM Reply With Quote
And don't forget, wheels come in different materials, hardnesses, textures and grit (roughness). There isn't a 'one wheel for all'.





http://www.ppcmag.co.uk

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matt5964

posted on 21/10/16 at 10:30 PM Reply With Quote
quote:
Originally posted by rgb247
Agree with the above, 3M discs are probably the best. Try the Cubitron 2 wheels, best i've tried.


3m have cubitron 3 now 😎





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skydivepaul

posted on 21/10/16 at 11:58 PM Reply With Quote
I have a cheap pro tools grinder which I can stop dead if i put too much pressure on it.
Other then that it will grind down mild steel ok, stainless just puts a groove in the wheel





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liam.mccaffrey

posted on 22/10/16 at 10:24 AM Reply With Quote
Don't rule out the spindle i bought a brand new screwfix one to convert to cup wheels. The wheels wobbled around like crazy and i suspected the machining i'd done on the bush.......turns out the spindle was bent!! Put a dti on the spindle





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nick205

posted on 22/10/16 at 10:26 AM Reply With Quote
My Bosch angle grinder and Bosch discs work fine. I've tried cheap ones before and found them lacking. Buying some well branded discs will probably help, Norton are used at work and receive no complaints.






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Myke 2463

posted on 22/10/16 at 04:27 PM Reply With Quote
Just take it back, not fit for purpose. sale of good act.





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David Jenkins

posted on 22/10/16 at 05:27 PM Reply With Quote
quote:
Originally posted by Myke 2463
Just take it back, not fit for purpose. sale of good act.


Actually... you're right - if it's vibrating so badly that it's unusable then it's not fit for purpose.






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computid

posted on 22/10/16 at 08:44 PM Reply With Quote
Had this issue recently with a £30 Chinese eBay jobby.

Turns out the washers holding the left hand grinding wheel on were about as bent as a 9 bob note! Quickly turned up a couple of replacements on the lathe and it was right as rain






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