I have not forgotten or discontinued this project, only when it is cold I have to first heat up my workshop before doing any work – which wastes a lot of fuel and a lot of time. Therefore in winter I never manage to do as much work as I would like to. But I managed to do something in the last two months – like building the tumbler (that has run for five days straight by now btw. and it has made a very nice satin finish on the broken blade).
But I could not do much actual work on the knives themselves, because first I must focus on making the necessary improvements. I managed only one step in the process and one failed improvement in the next one.
The step that I have managed with success is shaping the outline of the blades. Last time I ended up with three stacks of blanks held together with screws. So I took them to the belt grinder and ground the outline of all three stacks. After that I disassembled the stacks and cleaned up any irregularities, burrs etc.
I ended up with a stack of 12 knife blanks. They are not all identical, but in three shapes – next time I will have to think a bit more about how to get reliably reproducible results. To save my self trouble when cutting the handle scales I have marked the blanks in each group on the tang with letters T, V and X. Why these letters? Because they are easily distinguishable from each other and can be scratched with just two lines.
This step was not actually very time-consuming before – just 10 minutes per blade, or 1, 55% of the whole process. Theoretically not worth improving. But I hope that having three groups of four reasonably identical handles will save me some time when shaping the handle – which took 110 minutes per handle, or 17% of the whole process.
Nevertheless, shaping four blades at once did bring some minor time-saving in itself – I have spent only 5 minutes per blade now, so I have saved 5 minutes from my process. This has confirmed that this was indeed low hanging fruit – it was a very easy improvement.
Next step is basic grind of the blade – and this is where I have my first failed attempt at improvement to share in my next post.