Join Date: May 2006
Ferry, you most definitely do not need a grinder of any type.
You can rough out with a hacksaw and a big file, and then you can cut the contours with a scraper (skrap). To do the rough contour work a big scraper that is use by motor mechanics that you can buy from a hardware shop is OK, but for the detail work you must make your own scrapers by grinding a radius onto the end of a small three sided file. You then sharpen this on a whetstone.
The cold chisels you need you do not buy from a shop, you need to make these. Old round files are the best material. You forge the point and then re-heat treat.
You need a lot of scrapers and cold chisels, because they get blunt pretty quick, and the more you have, the less you need to interrupt your work to sharpen them.
The cold chisel you use to cut the outline of the sogokan need only be between 3 and 5 mili across the cutting edge.
The grinders used by current top makers are die grinders, as well as the usual flex shafts, dremels and angle grinders, but even with a die grinder you cannot get the correct contour for a sogokan. If you are highly skilled you can get it close, but you still need to do the final shaping and finishing by hand.