I am in the midst of learning how to hollow grind plane irons. I tried the Lee Valley jig that clamps the object to be ground and then one slides it across the spinning stone. That did not work for me. It just seemed too cumbersome.
So I stepped into the unknown and did it just using the tool rest. It was not 5 min. and I have what I wanted on an old Stanley iron from a #5.
I had another old iron that I could not tell who made it but it was thicker and nicked up. I thought what the hell give it a go. So I marked out a free hand black line to use as a guide and went after it.
Long story short. It was right on the money at around 25d and the camber looked as it a grinding jib was used. I will mark this up to beginners luck. When one does not really care if disaster happens one is a lot less tense.
Now I need to learn how to sharpen a camber. It took the stone to the iron and went through the grits but I is still not whisker cutting sharp.
After all these years of fear of using a powered grinder and finding out the I could do it opens up new opportunities for me.
The cambered iron had the last laugh. I cannot fine a plane it will fit. It is too wide, just barley for a SB #5. I have a Miller Falls 18 which is a SB #6 and it will not fit in there either. It did give me practice though.