Thread: Grinding countersink shank and a bit on tools.

https://www.youtube.com/watch?v=0a7hm9ffA1o&t=3s

Hello from the old bloke again.
This tool was made way off center and I was lucky to repair it. What steel gives off sparks like this.
Regards
BC

It seemed like grinding the shaft was giving off nice long sparks with a final little "firework explosion",
which I think is Tungsten or Moly' steel?


What I found interesting is that cutting the face didn't seem to have any branching in the sparks.
Could have been the video,
but using a different steel and brazing or friction welding would be a VERY unusual cutter !!!

Originally Posted by nigelpearson

It seemed like grinding the shaft was giving off nice long sparks with a final little "firework explosion",
which I think is Tungsten or Moly' steel?


What I found interesting is that cutting the face didn't seem to have any branching in the sparks.
Could have been the video,
but using a different steel and brazing or friction welding would be a VERY unusual cutter !!!

Why would it be a very unusual cutter? It is a common method of reducing costs on materials.

Originally Posted by Techo1

Why would it be a very unusual cutter? It is a common method of reducing costs on materials.

True.

For something like this countersink, with a large diameter head (relative to shaft diameter), I would think the force/stress from the cutting faces would make the weld/fusing/brazing too weak.


It might explain the runout from shaft to head centre, though !

Hello again.
The countersink looked to be 1 piece although it is hard to detect if tools are fabricated. I thought the shaft gave off sparks like manganese steel, ground engaging tools. You could induction harden the head and not the shaft so the 2 parts would grind different. Pity the brand name was damaged on the shaft.
Regards
BC