Southworth Steam Pump- first parts
by John
A couple of days in the workshop, and the large castings are almost fully machined. Straightforward machining. Made a couple of mistakes, but none fatal. Changing BA fasteners to metric.
The steam cylinders block in the mill vise. Almost complete water cylinders block sitting behind for the photo.
Steam cylinders on right, water cylinders on left. The temporary steel pins are to ensure accurate alignment of the 2 blocks. Water and steam passages come later.
This is the first model machining which I have done since April. It should be second nature, but I admit to a bit of hesitation, nervousness, initially. Especially starting on an irregular, slightly complicated shape like these. But it is all coming back now. And I am really enjoying it.
johnsmachines 
Nice work John.
Is there a table I can reference when switching from BA to metric? I will soon be embarking on a project that had plans all in imperial. All my tsps and dies and lathe threading capability are metric, it would save me a bit of time.
Glad you are back to building instead of repairing your machines.
Jenny
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Thanks Jenny, Yes, there is a table which I will send you. And post here, because others might be interested. Of course for most BA sizes you have to go slightly bigger or smaller to get to the closest metric. BA8 for example is 2.38mm. I chose M2. M2.5 would have been closer, but I am a bit low on M2.5 taps. Stainless fasteners in metric are cheap and readily available on ebay from China, as I am sure you know. John
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Hi John
Looking forward to the boiler feed pump build. What size is your pump.
You will give me ideas on how I will do my kit later.
Cheers
John
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Hello John, it is the 6″ duplex Southworth. Regards John
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Thanks
I am building the 8″ duplex later
Cheers
John
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John, do you have a copy of the Bertinat articles? They are about the 8″. I can send them if you wish JV
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Hi John
Would appreciate any information I can get.
Cheers John
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Hi John,
Greetings from Montrose, Scotland. I have enjoyed your posts about the Southworth duplex pump as I am currently making one (8″ version). I notice that you refer to the Bertinat articles – are these the ones from Model Engineer Vols 170 – 172? I’ve been trying to track these down for some time, without success. Are you able to help please?
Regards,
Dave Edwards,
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Hi Dave, I have a pdf of the articles. I can send them but I will need an email address. John
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John I have a 6 inch southworth duplex pump that needs some work to get it to run properly are you able to assist with drawings, articles?
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hi, where did you get the soft jaw blanks from to fit the 125, as i have been looking for my own boxford 125 and cant find them? thanks and rgds Graeme
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Hi Graeme, I can’t remember exactly, but they were remnant stock, and I got their last 2 sets. Sorry. John
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