Cam Haslehurst wrote:So tonight I attempted the make a center punch
In shop when I was in school all of the projects was to make a cold chissle out of a piece of rolled steel, shape and harden the cutting surface, the grade was pass or fail, when you finished our teacher would take a nail and lay it on the anvil and then use your new chisle to cut it in half, if it cut the nail without damaging the chisle edge you passed, if it made any indention in the edge you failed and started over. one fella had hardened to far up the shaft of the chisle and when the nail was cut it also broke the chistle. The reason your punch is not hardened all the way to the end is it would be like that one fellas and brake, the softer steel alows it to absorbe energy both when being hit and the equal reaction from the object being cut.
we hardened the edge by cooling it in used motor oul after heating it.
K Eilander wrote:Saw this and it seems like a useful trick.
Apparently they make welding filler rod made of high-strength tool steel!
this has been around a while, we used to take the valves out of a water pump on a water well drilling rig and build them up like this and then have them machined back down so they would seal up propperly.
they had to be hard surfaced like this because these pumps carried a lot of sandy muddy water through them and wore down if not a hard surface.
This was definantly worth letting folks know about for sure!
Anne Miller wrote:Clifford, what are your plans for those slabs?
They look very think so maybe benches? They look to think for tabletops and other things I can think of.
Or do you plan to make lots of smaller boards?
Those slabs are seriously beautiful!
Joshua States wrote:In the knife-making world, we call that a serious score. Nice heartwood walnut like that makes excellent handle material. How thick are the slabs?
Mike Haasl wrote:Hi Clifford, I don't think I hit water but I'm not sure why water was disappearing down the pipe. I tried some other spots without success so I've kinda given up on the sand point...