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I use a 400 grit 6" flat diamond lapidary disk on a cheap 6" bench grinder. I've been on the same one for 2 years now with no sign of wear. Mine is made of steel and doesn't require a backing plate. I chuck the tungsten in a cordless drill to spin it while I sharpen. You can have a look at them on ebay http://www.ebay.com/itm/US-150mm-6-D...item1c3fae3165 320 grit should work also.
The link is for example... I don't know the seller.
Last edited by zoama; 06-02-2015 at 05:39 AM.
Links to my welding projects > : Spray Arc with the 250p : Coldsaw Stand : Welding Cart : Heavy Duty Rolling Shelf : Taller Bandsaw
2013 250EX : SSC Pedal : I-MIG 250P 20' Profax gun : Power Plasma 60 p80 torch : 3M Speedglas 9100XX : Evolution Rage 3 DB cold saw
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