One of those happy days where the post man arrives with new kit. I got my 4" zither slim four jaw chuck.
This seems like a more unusual purchase for me considering I already have two four jaw chucks, but this photo will hopefully explain the situation better than I can.

To the first on the left, and the last on the right, are my two old ones. Theres a project coming up (stuart v10) that has a lot of small castings to machine on the 4 jaw, and the largest Clarke one (7.5".) feels too heavy handed for smaller scale work, especially when there could be many change overs.
The last is the wee sherline one (Just under 2" ), again, feels too small on the opposite end of the spectrum. So zither comes to the rescue with the goldilocks chuck, which is neither a bother to change over, and just the right size for the job.
The little twist of fate is that I must use a backplate to fit it, so it wont be exactly quite as slim as just the chuck itself, or else it will never get on my lathe.
I also experimented on a few of the iron castings to see if I can stress relieve/anneal the iron castings in my muffle furnace:

So that's the door open, standing back a little distance, at over 700 degrees Celsius. I will leave it in there over night and when it's cooled off the following day I shall see if it has worked at all.
Michael W
Edited By Michael-w on 17/01/2017 19:27:32