Originally Posted by
HammerII
best tool for scrapping is a 4 1/2" grinder with a 6" cutting disc
Ouch!!!!
Never put a oversized disc in a angle grinder, first, the guards too small which infers you are using a oversized disc in a grinder without the guard....
The G forces on the outer edge of the disc are too high because the disc is spinning far too fast for its diameter, and the discs got a good chance of breaking apart at speed.
The internal G forces of the motor offset the G forces of the disc, if the discs G force is too high, the grinder can do some weird and unexpected movements opposite of all expectations when things go wrong.
If you use grinders a fair bit, its best to have at least 3 of them, a 9 inch, a 7 inch, a 5 inch, and or maybe a 4 1/2 inch.
Maybe a second 9 inch so you can use one for grinding discs and the other for cutoff discs only.
On the plus side, when a 9 inch disc has worn down to 7 inch dia, you can then take it off and use it on the 7 inch grinder, and so on.
Grinding disc speed is actually based on 'Meters/minute' of the discs outer edge.
Not so much the top revs that a disc can do.
I hope everyone takes notice of this.
Unfortunately every time I give out this info, within a week there's a news report of somebody having a bad accident using a angle grinder. I will post this news report here when it happens as a reminder...
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