Someones bin the Manchester Musium of Science and Industry, hope you enjoyed it Dave, did you catch them running the engines, I've bin a few times and only seen them running once, and thats when they were getting ready for a visit from "toby jug ears Charlie".
Made a start on the Standards, the drawing calls for 20mm square brass, I failed to find a supplier to sell me the small qty I wanted, most had a miniumum order qty of 500 kg, Macmoddels had 7/8" in stock and as its close I had a run out to collect it and save the postage.

Cut to length with a hack saw the bar end with the chamfer looked as though it might not clean up.

Then with a self centering four jaw and a back stop, face them all off to the same length.


The chamfer didn't clean off

but it looks like it just might be fit for use after milling to size.
Using a fly cutter mill to 20mm square, to do this I first roughed two side to give a square of about 20.8, then set the mill to take a cut down to size, locked everything and at this setting skimmed the remaining sides to get all to the same size, I like to work on the + side so the sizee I have is 20.2.

The chamfer just left a slight witness this can be my keaper.
Next some hole drilling, First thing I did was scribble up a crib sheet, so that I don't get mixed up. Then using an edge fider first centred the mill up on the centre line of the bar, then again with the edge fnder found the end of the bar, and moved the table onto the 4mm hole position, and made this my datum position so everything was zeroed up.

First hole centre then drill undersize to leave a wisker for a 4mm hand reamer.
Now for the steam ports, this is just a mater of chasing arround the datum + and - on the cordinates first with a centre drill then a 2.2mm drill.


Then x and y back on zero and off set to bring you to the bearing coordinate.
Centre drill then roughing then 1/2" drill.

And finaly finish off with a 13mm hand reamer:- I'd tried this drill combination out first on a bit of scrap brass to make shure i got a good fit on the bearing.

Just a trial fit of the few parts to see how it looks.

I've got the rest to do now but that a job for tomorrow
Stew