My grinderette is a Bosch PWS 600. A nice machine that I have had for years. It is (nominaly) a 4.5 inch grinder.
We have a similar machine at work, and we obtain the 1mm cutting discs from the local engineering supply shop which is just around the corner. I have noticed lately that the discs seem a tighter fit than they used to be, but they still go on with a bit of wiggling.
As I had almost run out of discs at home I bought five from this shop (at £1 each) and put them in storage for later use.
Now, when in Aldi a few days ago I noticed they were selling similar discs at ten for £3.70 or there abouts; so I bought a pack and , again, added them to my stock.
Today I needed a disc, so tried to fit one of the ones from the engineering supply; it wouldn't fit over the spigot.
These discs are labeled 'Norton (Saint Gobain) Vulcan' and are made in poland.
The dimensions state 115x1.0x22,23 and also 4 1/2" x 3/64" x 7/8"
They can be pushed onto the grinder spigot, but you will have to pry the finished disc off with a screwdriver.
So I pulled out one of the Aldi discs.
They are labeled 'Workzone'
Diameter 125 mm, Thickness 1.2 mm, bore 22.33 mm.
These fit nicely on the spigot, BUT, and this is the point of this message, They are too big to fit inside the Bosch safety guard.
I almost did something very stupid.
I reasoned that , as they were only two or three mm too big, I could run without the guard until they had worn down a bit then re-fit the guard.
I even got as far as removing the guard and fitting a disc to see how it would work out.
But seeing that this slitting disc would be running at 12,500 rpm withing half an inch of my hand restored common sense.
I intend to make another guard that will accomodate the discs. At that price they are too good to pass on.
So if you buy some of these discs, and they wont fit your grinder, DO NOT REMOVE THE GUARD.
DON'T DO IT. It just isn't worth it.
Dave.