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Grinder stone types

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Nick_G	24/04/2014 21:19:12
1808 forum posts 744 photos	Just been to a friend of mine to use his bench grinder. (one was on my shopping list) Anyway. He had a nice spare 6" one and has kindly donated it to 'the cause'.! What are the type of stones I need for sharpening lathe tools, and are they different types for HSS and tungsten.? Cheers, Nick
WALLACE	25/04/2014 09:50:55
304 forum posts 17 photos	Hi Nick. Aluminium oxide ( 'grey' ) for HSS and silicon carbide ( 'green') for tungsten carbide. Arc Euro Trade do a variety of sizes and grades. I would seriously recomend making some kind of tool rest ( Harold Hall details one on his website ). Off hand grinding is difficult to get the right angles and wastes valuable tool steel in the attempt ! W .'
Nobby	25/04/2014 23:06:29
587 forum posts 113 photos	Hi Nick As W says Grey for HHS Green for Tungsten . Please note before fitting any grinding wheel New or second hand Give it a tap to see if it rings. If it dont it will be cracked . also the fitted washer should not be a tiny one it may have been said before on a off hand grinder dont leave a large gap between the wheel & the rest . But you already know that !!!! Nobby
Ian S C	26/04/2014 10:28:05
7468 forum posts 230 photos	Hold the wheel with your finger through the hole, and tap it lightly with a bit of wood, screw driver, hammer handle, or what ever. THERE MUST BE soft paper discs on each side, under the clamping discs, I have noted that one large retailer in NZ sells grinder wheels without the paper washers, any complaints that I have made have been shrugged off. Not the place I would be buying from. The clamping washers should be about 1/3 the wheel diameter, a lot of them are just pressed out of 3 mm steel, and usually a bit on the small size. Ian S C

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