Easier and safer to go and buy a glass cutter (diamond or wheeled type)
from the local tool/builders merchant - unless of course its toughened
glass, and if that is the case, it will shatter when you trim it using
1.5mm is probably too fine an amount to "cut" off 4mm thick glass. On a much
smaller scale, I've used the green silicon carbide stones you can get for
grinding glass with a Dremel.
For the sort of area you're talking about though, you'd be looking at some
some sort of carbide sanding belt.
I have a vague recollection the industry use wet belt systems for grinding
glass so it may be out of DIY scope anyway? I'd check with a glass
Daft question but is it possible/easier to take 1.5mm off whatever the glass
is going in? Also consider whether it might be cheaper/easier just to
replace the glass with correct size from your glass merchant.
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