I have just spent about 5 minutes "polishing" the grit on my angle grinder, trying to sharpen the bits on a post hole borer, and I barely managed to remove the oxide layer on the bits.
The grinding wheel looked like a mirror. This stuff is HARD (and possibly cloggy, although the amount I removed would not have clogged much). It appears to be much harder than the TCT tips on my chainsaws, for which I use a diamond "pin-grinder" in a dremel-like device.
So. I saw one ad that said that diamond blades will do the job. But when I rang the hardware store, they had 100mm diamond blades from $7
- $70, and none said "can do tungsten". Obviously for this I would avoid the $7 ones, but does anyone have an idea about a $27 one? Or do I have to spend $70?
The bits cost $25 each and there are 7 of them, so you can see my incentive. I have lots of rock to do, so I would like the idea of the odd touch-up of the bits, as this can only help driling speed.
On the other hand, these bits _may_ be a near lifetime investment.
Thanks for any help/advice.
**************************************************** remove ns from my header address to reply via emailI went on a guided tour not long ago.The guide got us lost. He was a non-compass mentor.........sorry ........no I'm not.