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A lot of This is Incomplete

   

The Finished Casting

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I got the casting back from the foundry yesterday,I am well pleased with it. I just have to machine it now, eeeeek.

The really annoying thing is I beefed up the casting where it doesn't need it and left some parts rather thin...

I asked to see a pattern with a core and it's all pretty simple. So I will remake the pattern and use a couple of cores, that way it will be possible to make it with uniform wall thickness and will require less machining.

The finished casting is almost 7 kg, I am going to have to machine .150" out of the bore and 11 mm off the height, this was intentional - one of the foundries told me to make a large allowance for machining.

 

Looking at the quality of the casting I could have got away with leaving 50 thou to clean out of the bore and a similar amount off each face. I don't have a milling machine yet, I almost went and bought one yesterday, so all the machining is going to be done in the lathe, the only bit that's a problem is the starter pad, I have left an awful lot of material to bore out of it, I am wondering whether a boring tool in a drill is feasible, probably not. So I will have to hold the adapter on the cross slide and bore the boss out, could do with a large angle plate. Wonder about knocking up a milling spindle to go on the toolpost ?

Must go and buy a mill....................

Not a lot more to say about it, I will put a finished picture when it's machined.

 

If you now of a mill cheap or being scrapped let me know, I could do with a new lathe as well;-) While I am on the scrounge, tooling and material is always welcome as is measuring tackle.

I didn't quite get my new acquisition in the picture a Chesterman 24" vernier lovely bit'o' kit..

So should I have spent £300 and bought a Dudleigh Engineering adapter? silly question really.

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  Cobbled together on the 31 January 2003
by
Richard

{last modified 31 January 2003}