Oi worked out that i was paying 50 cents in 9 inch cutting disc per fridge compressor
& i was using the new disc to cut one end of the Copper loops off to get the wire out of the Iron stator.
Its most efficient if once the 9 inch disc is worn down to 7 inch, or plus just a tiny bit, to put that disc into a 7 inch grinder.
Its all to do with the M/minute at the outer edge of the disc.
NEVER put a oversized disc into a grinder, OR use a grinder without its guard.
Make sure you have the correct mounting flanges for your disc, flat or a cupped centre, and internal dia, mostly 7/8ths (22mm)
You can use a worn disc in a smaller grinder as long as the disc is no bigger in dia than what the grinders ment to use.
So a 9 inch disc worn down to 7 inch will go into a 7 inch grinder.
Worn down to 5 inch, will go into a 5 inch grinder
Worn down to 4 1/2 will go into a 4 1/2 grinder.
A 7 inch disc in a 9 inch grinder is inefficient because the surface speed of the outside dia, cutting face, is travelling too slow & it will break the grit off.
The grit should grind the metal away, once the individual grit has got dull, it heats up & expands & that bit chips off as dust, exposing new sharp grit to do the grinding again.
Too slow a mm/M and the grit wont get hot enough to expand & the whole bit of grit breaks off & you get a brown dust instead of fine grit/steel finings.
And dont grind anywhere near cars or window glass, the sparks will melt into or attach to glass, ruining it immediately.
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Originally Posted by hills
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