Good evening folks,
I'm in the process of restoring some old wooden planes. One is a jointer, two are smoothing planes and one is a rabbet plane. Now the blades are in pretty bad shape and they're giving me a bit of a hard time to restore them to a point were I say I'm satisfied with them. Most of them got some real bad hollow spots on the back up to the edge.
I'm not a very experienced person when it comes to grinding nor do I own or have access to an electric grinder or belt sander, so it's my extra coarse DMT diamond stone, the irons and me against time.
While grinding the back I realized that different movement directions revealed different high/hollow patterns, which seems weird to me.
I made this picture to try to illustrate what I'm talking about. I actually started this on a coarse sand paper on glass a while back and went back to it today. The first thing I noticed was that grinding on the diamond stone revealed completely different spots than on the sand paper with glass, which seems weird to me. Was my glass plate bent? Is my stone not flat?
The green section showed high when grinding straight forward from bottom to top of the stone. The orange section was ground afterwards rotating the iron sideways and rubbing it up and down the length of the stone. Then I got curious and made a circular movement which yet revealed a different high spot. Is this just normal? What am I viewing here? Apart from still having a lot of grinding left to do this made me doubt about me failing hard on the back grinding or something like that.
Another detail here would be that my stone got a goldenish color to it after grinding these irons. The rabbet plane iron looked really old and black, could that be the reason? Now when I took the photos I realized the other irons actually got this tone to it also, which is not notable with the eye. (It sure looks awesome on the photo). Is this something to be concerned about? Should I try to clean my diamond stone or can this be ignored?