Exploding Cutting Disc

[chevy2]

Sorry! Can't let that pass. It is all about tip speeds and by the time the 9" disc is worn down enough to fit in a smaller grinder, the reduced diameter has a similar, or lower tip speed than the 9" grinder, so quite safe. Been using them for over 30yrs without a prob. It is all about centrifugal loads, which go up by a square of the RPM.

Fair comment, i realise its about surface speed travelled for a particular diameter,
imagine a scenario "if" a 9" disc thats now a small diameter disc was to explode in a 4.5" grinder and the health & safety guys investigate it would be classed as negligence for fitting a disc that is "marked" for use in a lower rpm machine,
They'll simply photogragh the machine and rpm and also the disc and max rpm = guilty.

 

[brightspark]

Fair comment, i realise its about surface speed travelled for a particular diameter,
imagine a scenario "if" a 9" disc thats now a small diameter disc was to explode in a 4.5" grinder and the health & safety guys investigate it would be classed as negligence for fitting a disc that is "marked" for use in a lower rpm machine,
They'll simply photogragh the machine and rpm and also the disc and max rpm = guilty.

yes in industry and employees using them along with public liability insurance etc etc but for private workshop use by ones self along with the rest of your machinery hse does not enter in to it. common sense and care still does

 

[KemppiFrog]

Fair comment, i realise its about surface speed travelled for a particular diameter,
imagine a scenario "if" a 9" disc thats now a small diameter disc was to explode in a 4.5" grinder and the health & safety guys investigate it would be classed as negligence for fitting a disc that is "marked" for use in a lower rpm machine,
They'll simply photogragh the machine and rpm and also the disc and max rpm = guilty.

Also fair comment.
HS&E (which I don't see much of) would naturally take the view that suited them. BUT, if it was critical in court, likely the technical answer would win.

Edit: Missed BS's post.