I've recently taken up woodturning and have now done enough to blunt my tools. I managed to sharpen one roughing gouge but at the price of 4 knackered DMT folding stones. Is it best to sharpen on my bench grinder or is a gentler method preferable. Yes I know the Tormek sharpener is beloved in the world of woodwork but I don't want to lash out than kind of money.