CARP negative rake scraper
CARP negative rake scraper
This negative rake scraper has a quarter round ground tip. This type of scraper is often used to finish the inside and outside of bowls. Because the chisel is ground at a negative angle, the chance of catches is significantly reduced. Moreover, the 2 bevels are ground in such a way that the tool can be used in both left and right directions. The tool is heavy, 9 mm thick and 25 mm wide. The handle is 32 cm long.
Handle
A handle for a woodturning tool is sometimes long and sometimes short. Depending on the function of the tool. A bowlgouge or roughing gouge needs a long handle, a spindlegouge needs to be manoeuvrable, so a short handle is handy. Furthermore, it is useful to easily recognise the handles when they are hanging in the rack.
CARP tools
Carp gauges are made of hardened HSS M2 steel. They are forged and/or milled, then hardened to 63-64 HRC, then ground and polished.
Harden
How good a woodturning tool is depends largely on the hardness and toughness of the steel. So a lot of attention is given to hardening chisels. This is a lengthy process. It starts with heating the steel. This is done in absolute vacuum. Then the chisels are hardened in 3 steps, before undergoing another process of heating and cooling. Here, temperatures of up to -185 degrees are reached (in liquid nitrogen). Quality is strictly monitored. Between 5 and 10% of each batch of chisels is tested for hardness and toughness.