For some reason angle grinder discs wear out really really quickly when used to cut thru roofing material, even when theres several sheets stacked onto each other.
I guess its because of the thin sheetmetal section & each sheet wants to grab & bash the grains of grit off the disc.
Normally when grinding, the individual grits should rub against the metal, when doing that it will rip the surface of the metal, abrading it away.
As the individual grit wears, it gets blunter (imagine you pushing a big sharp gritty rock over a sheet of glass)
that causes it to heat up & the grit will expand & the blunt surface will chip away, leaving a new sharp surface to do the grinding.
The bonding material (glue) is a big factor too.
The harder the metal being worked, the smaller the grit & softer the bonding material.
Anyway, theres a certain metal disc that can be used in a skillsaw to cut thru thin roofing metal.
They work really well & don't blunten, they are very very LOUD though...
I haven't tried this yet, but I keep hearing about using a old worn out tungsten tipped blade, backwards in the skillsaw.
Keywords 'backwards' & I think a normal blade will do this too, not sure, mighta be to do with the sort of metal the disc's made from.
Wear earmuffs, you can close your eyes, but you can't close your ears......
Bookmarks