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Do you know if he properly heat treated it? I had a box of window weights to use as munition for a trebuchet built many years ago, every one of them was easily broken into smaller pieces except one....

Actually cuts pretty well with the minigrinder, had to toss a few wheels due to fractures but if I had been more careful I could have done it with just one. If anyone else is going to do it...

That's a good tip, I'll keep that in mind if I ever need a longer one

Thanks for your detailed reply!
From my research prior to breaking it apart it seems there is a mix of grey and ductile manhole covers. This particular one was from some abandoned WWII...

Will probably try out the hammer method in-between machining stages, thinking I'm going to machine out the inclusion as well as other sections along the SE to decrease weight and increase moment of...

First time posting here, doing a lathe rebuild and finding the need for a dovetail straight edge. Funds being that of a college student i have ethically sourced a manhole cover. I possibly have...