The forged screwdriver was the most challenging project for me, specifically the grinding portion. The screwdriver tip had to be grinded down manually, it needed to be symmetrical, smooth, and have flat continuous faces on both sides. Because of this, when it comes down to grinding the screwdriver tip it is important to be very cautious about which grinder you choose. Some grinders in the EMEC remove material more aggressively than others, so if you're close to meeting tolerances, it's best to choose a grinder this less aggressive. A helpful tip is to wrap a piece of painter's tape around the shank to ensure you're hitting the same spot every time, it will make it easier to get a smooth consistent face. 

For knurling, making sure the piece is squared properly and that both the knurling wheels engage at the same time so that the knurls are consistent. Be mindful of the brush hairs when you are applying oil during the knurling, they can get embedded in the piece if you don't remove them.