I have started machining some UPT castings that I picked up recently for a ridiculously low price.

So far I have machined the 2 basic arms, base casting and the column with the recommended keyway for registration.

So far so good.

Moving on to the table, I machined the spigot to 0.75" and mounted in a 5C collet chuck to machine the table face, this is where things started to fall apart.

The casting has a significant amount of flaws. Having skimmed the face off about 10 thou, I still have evidence of blow holes.

Consulting the Workshop Techniques book, I cannot find any dimension for the thickness of the major part of the table, the outer web, inner web and relief on the outer web are dim'd but the table thickness appears to be missing.

Can anyone who has built this give any advice.

Thanks in advance

Graeme

Hi Michael,

Thanks, Already been there, lots of useful info but not what I am looking for. Not really looking to by 'additional plans' as the GHT book 'Workshop Techniques' pretty much covers everything that is in those plans and I am aware of their existance.

What I am really looking for is info from someone who has already built one of these. I am sure there are many out there who will give useful info

G

Hi M.W.

I had thought of that as an option but the flaws are realistically too small and close together to warrant that kind of treatment.

One option I had considered, and has got me out of a hole before (PUN intended!) was to grind out the imperfections and then CI weld over the area and re-machine. In order to retain as much materiel as possible I think this may be the best option. Once heat treated and stress relieved, this would most likely give the best resolution.

G

Versaboss, many thanks, that is exactly the info I was looking for, looks like I can take another 25 thou off the thickness which should get me under the flaws and still leave the table a bit thicker than yours

regards

G