High Pressure Steam Table Engine

[Jo]

Time to start using up some odds and ends from the scrap bin:

The square ends off of the 5A's conrods were used for the square washer:



Separate bits for the rounded section. First undercutting well before rounding with a file:



I did consider making a form tool but decided I could do it just as well by hand. So a set of washers for the bottoms of the columns:



Now I need to do the same for the top 

Jo

[Jo]

The square sections from the top of the old castings have been bored to fit the bronze columns, leaving me with some very useful bits of Cast Iron off cuts 



The lower section has been turned up in a single piece:



Which can go on the top of the column:



Giving us 4 columns:



And that is where they are going to stay for now 

Time to look at the Table. First we need a datum and that will be the bottom so mount it as flat as possible and check with a level:



Then a a quick skim round but taking off as little as possible. This still is not enough 



Another 0.3mm and 



Ready for a bit of casting fondling 



 

Jo

[Jasonb]

Those columns would not look out of place on the Parthanon and are a good improvement over the cast ones 

[bent]

Yup, like the look of the machined columns much more than the cast ones.

[Kim]

Beautiful columns, Jo!  I couldn't agree more - so much better than the original cast ones! 

Kim

[Michael S.]

Very good Jo, this is going to be a real machine temple. Great!

Greetings Michael

[scc]

Looking good Jo.           Terry

[crueby]

Excellent!   

[Baltic]

Hi Jo,
Another build thread I have started to follow, brilliant work there mate, 

[Jo]

Thanks Guys, sorry for the slow response but the local area lost all power last night and they didn't seem to be in rush to put it back on 


I think I have a way forward with the table. It has its challenges not least one of the corners which is missing a bit of the top thin surface  And I have noted that there are lots of hard bits on this casting 

Jo

[Jo]

I have found another drawing FEATURE 

The distance between the two holes for those long side connecting rods is missing from the drawing    The connecting rod Yoke is shown as 1.86" or 47.25mm. This looked wrong on the casting......

Looking at the Piston rod crosshead it shows 2.25" or 57.15mm between the centres of the two side connecting rods...

Back to the casting  57mm seems to match up with the centre line of the slots that are already in it. I'm going with the 57.15mm and will change the Yoke to be the same



This may also account for why I read somewhere that one builder was complaining that the side rods hit the side of the exhaust where it goes round the cylinder.

Jo

[Bearcar1]

OOoohbah Doobah!! I like those columns Jo, Very nice work and vision in making them. 


Jim

[steam guy willy]

Hi Jo, this is coming together and looking great.. bar stock modelling is so much better than castings usually and it is difficult getting scale sand for the casting process ?!!!

Willy

[Jo]

bar stock modelling is so much better than castings usually 

Careful

Round here we know Castings are sexy 

Jo

[Jasonb]

Round here we know Castings are sexy 

Jo

I've heard about these sadomasochist types