Author Topic: Southworth Engines Boiler Feed Pump  (Read 54025 times)

Offline arnoldb

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Re: Southworth Engines Boiler Feed Pump
« Reply #25 on: April 19, 2011, 03:59:53 PM »
Good going Stew  :thumbup: - great job so far!

I see you finally got around to 2mm or smaller screws  :lol:

 :beer:, Arnold

Offline madjackghengis

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Re: Southworth Engines Boiler Feed Pump
« Reply #26 on: April 19, 2011, 08:44:57 PM »
Hi Stew, I haven't been able to follow this thread for a couple of days, and you've done some very fine work.  Your attention to detail is apparent in every little bit you make.  I'm getting a real education on this build log.  I've long wanted to see the inside of one of those pumps, and you show it off very well.  It is gorgeous looking as you build it.   :beer:  Cheers, Jack

Offline sbwhart

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Re: Southworth Engines Boiler Feed Pump
« Reply #27 on: April 20, 2011, 01:55:50 PM »
Thanks a lot Lads

Little more today

Made the spool valve, from 4mm stainless steel you make it like a dumbell the middle bit is only 1/16 dia so it need some suport from a centre, I made it over length for the centre and faced the centre out to get the correct length.






And how it fits in the engine the inlet valve is activated by the valve rod the exhaust valve from the back pressure in the cylinder moving the spool valve.



Just the clack valves in the pump to finish off and a final assembly then we can see if she will pump water.

Stew
A little bit of clearance never got in the road
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Location:- Crewe Cheshire

Offline Bogstandard

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Re: Southworth Engines Boiler Feed Pump
« Reply #28 on: April 20, 2011, 04:36:42 PM »
I got to get my grubby gorilla fingers on this beauty this afternoon, when Stew called in for a gum beating session.

If it runs as well as Stew has made it, it will be a stunner.

Stew makes light of the machining part of this project. It is in fact a very precise machining exercise, like a steam powered swiss watch.

Very well engineered Stew, a real credit to your skills.


John
If you don't try it, you will never know if you can do it.

Location - Crewe, Cheshire

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Offline sbwhart

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Re: Southworth Engines Boiler Feed Pump
« Reply #29 on: April 22, 2011, 01:19:02 AM »
Thank you very much John much appreciated.

Well I lost round one at getting to work, took me ages to get my head round how to set the timing at last I figured out that due to the rod stops and the configuration of the steam way that it work back to front to a more conventional slide valve set up, when I eventually got it sorted and subjected it to air found that I'd got a huge air leak from the bottom steam chest cover. At that point decided I needed a cuppa and a bit of cogitation time.

Round two start this morning

Stew
A little bit of clearance never got in the road
 :wave:

Location:- Crewe Cheshire

Offline Stilldrillin

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Re: Southworth Engines Boiler Feed Pump
« Reply #30 on: April 22, 2011, 01:43:43 AM »

Round two start this morning

Stew

Today's the day......   :smart:

Good luck Mate!  :thumbup:

David D
David.

Still drilling holes... Sometimes, in the right place!

Still modifying bits of metal... Occasionally, making an improvement!

Offline sbwhart

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Re: Southworth Engines Boiler Feed Pump
« Reply #31 on: April 22, 2011, 04:30:55 AM »
Got it running  :D :D :D :D

Bigest problem getting a seal arround the steam chest.

I'll run it for an hour before trying the pump, I'll post a vid with the pump running (fingers crossed)

 :thumbup:


Stew
A little bit of clearance never got in the road
 :wave:

Location:- Crewe Cheshire

Offline sbwhart

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Re: Southworth Engines Boiler Feed Pump
« Reply #32 on: April 22, 2011, 08:30:00 AM »
Her we go



 :D :D :D :D


Stew
A little bit of clearance never got in the road
 :wave:

Location:- Crewe Cheshire

Offline Bogstandard

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Re: Southworth Engines Boiler Feed Pump
« Reply #33 on: April 22, 2011, 08:34:44 AM »
Stew,

Great.

N'uff said.


John
If you don't try it, you will never know if you can do it.

Location - Crewe, Cheshire

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Rob.Wilson

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Re: Southworth Engines Boiler Feed Pump
« Reply #34 on: April 22, 2011, 09:46:50 AM »
 :clap: :clap: :clap: :clap: :clap: nicely done Stew  :bow: :bow: :bow:

Interesting project


Rob 

Offline Stilldrillin

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Re: Southworth Engines Boiler Feed Pump
« Reply #35 on: April 22, 2011, 12:00:51 PM »
Big smile time again.....  :ddb: :ddb:

Very well done Stew!  :clap: :clap:

David D
David.

Still drilling holes... Sometimes, in the right place!

Still modifying bits of metal... Occasionally, making an improvement!

Offline arnoldb

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Re: Southworth Engines Boiler Feed Pump
« Reply #36 on: April 22, 2011, 03:41:44 PM »
 :clap: :clap: Good going Stew  :thumbup:

 :beer:, Arnold

Offline saw

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Re: Southworth Engines Boiler Feed Pump
« Reply #37 on: April 22, 2011, 04:34:15 PM »
Nice I just love it  :clap: :clap: :clap:
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Offline ozzie46

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Re: Southworth Engines Boiler Feed Pump
« Reply #38 on: April 22, 2011, 06:01:44 PM »

   Great job Stew.  :bow: :bow:  :beer: :beer:

   Isn't that Colorado Rockies cup a bit far from home.   :scratch: :scratch:  :) :) :)


  Ron
 
  Pueblo Colorado, USA

Offline sbwhart

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Re: Southworth Engines Boiler Feed Pump
« Reply #39 on: April 23, 2011, 12:47:50 AM »

   Great job Stew.  :bow: :bow:  :beer: :beer:

   Isn't that Colorado Rockies cup a bit far from home.   :scratch: :scratch:  :) :) :)


  Ron
  
  Pueblo Colorado, USA


Yes, it is, visited my wives cousin who's a Minister at a Denver Church a few years ago, our Daughter saved the cups from a baseball game we went to, I now use them in my shed for the odd wet jobs.

Thanks for your comments Chaps

Stew

A little bit of clearance never got in the road
 :wave:

Location:- Crewe Cheshire

Offline Bogstandard

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Re: Southworth Engines Boiler Feed Pump
« Reply #40 on: April 23, 2011, 01:43:49 AM »
A gang of us (3 actually) gathered in my little shop last night and put this little baby thru it's paces.

First off, I personally couldn't believe how little pressure it required to run. We had it choked down to what we summised as about 2 PSI and it gently nodded away doing it's own thing.

Restarting, even from this very low pressure, it didn't miss one beat, stop it, put tiny pressure to it again, and away it went, just as though it had never stopped.

One of our mottley crew then brought up the question.

This is basically a single cylinder double acting engine, and when used in the context of powering a model as an engine, single cylinder engines are usually shyed away from, purely because once stopped, they are very fickle as to whether they can restart again just by applying pressure. The valving arrangement on this engine seems to have solved this age old problem. That definitely requires a good dose looking at. As far as I can see only one problem exists, you would have no control which way the crank would turn as you restarted.

But anyway, back to this pump.

General consensus all round. A fantastic little unit that does what it was intended to do absolutely perfectly.

Very nicely made Stew. :bow: :bow: :clap: :clap:


Bogs
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Location - Crewe, Cheshire

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lordedmond

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Re: Southworth Engines Boiler Feed Pump
« Reply #41 on: April 23, 2011, 02:39:28 AM »
Stew

Whats it like when its working against a head ,after all that what it is a boiler feed pump

as you know it should be able to pump to a higher pressure that that it is fed with



Stuart

Offline sbwhart

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Re: Southworth Engines Boiler Feed Pump
« Reply #42 on: April 23, 2011, 04:19:30 AM »
The gang of three did shake out one small fault:- an air leak arround the steam chest, Johns leak detector (cigaret) traced a number of leak that we fixed by shortening screws that were bottoming out, a bit of Hylomar fixed others but one persisted, that was eventually traced to the little o ring arround the valve rod, the pocket cut into the steam chest for it, was way too small for the ring which was holding off the bottom cover, so this morning I cut the pocket bigger, and made some PTfE gaskets from material that John gave me, this seems to have solved the problem, its now running even better and the pump also seems to be bedding in nicely.

Stuart

I tried elevating the out pipe this morning to give it a head to work against it managed a 10" head no problem, that was the length of the pipe, putting my finger over the pipe, stopped the flow but there was a considerable pressure their, the pump kept on working, and the coupling joints started to leak.

Hope this helps

Stew
A little bit of clearance never got in the road
 :wave:

Location:- Crewe Cheshire

lordedmond

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Re: Southworth Engines Boiler Feed Pump
« Reply #43 on: April 23, 2011, 05:15:56 AM »
Stew

thanks for the info

with 80 psi steam it should do at least 95psi on the water side

I have seen the LBSC type running ( the one with the two rockers on top ) they do chuff well when under load

they sound nice in the station with the exhaust up the lum under load


Stuart

Offline sbwhart

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Re: Southworth Engines Boiler Feed Pump
« Reply #44 on: April 23, 2011, 05:42:50 AM »

I have seen the LBSC type running ( the one with the two rockers on top ) they do chuff well when under load

they sound nice in the station with the exhaust up the lum under load


Stuart

Just dug out my copy of "shop, shed and road" is that the pump LBSC calls Duplex Double Acting Feed Pump ?. Looks a very interesting design, you can't help but admire the man.

Stew
A little bit of clearance never got in the road
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Location:- Crewe Cheshire

Offline NickG

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Re: Southworth Engines Boiler Feed Pump
« Reply #45 on: April 23, 2011, 09:44:20 AM »
Wow, very nice work Stew. Yourself and Bogs have recently made machining castings correctly look easy but I know otherwise!  :thumbup:
Location: County Durham (North East England)

Offline sbwhart

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Re: Southworth Engines Boiler Feed Pump
« Reply #46 on: April 23, 2011, 10:12:36 AM »
Thanks Nick

I was begining to wonder where you were having not heard from you for some time. I bet that four letter word "work" as kept you away.   :D

Stew

A little bit of clearance never got in the road
 :wave:

Location:- Crewe Cheshire

lordedmond

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Re: Southworth Engines Boiler Feed Pump
« Reply #47 on: April 23, 2011, 10:42:04 AM »
yes that the one Stew

you can not help but admire the man/woman  but that another story , but a brilliant engineer ,he did a lot to get us where we are today , I wonder what he would have made of the current CNC setups


very good work with the pump BTW

Offline NickG

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Re: Southworth Engines Boiler Feed Pump
« Reply #48 on: April 23, 2011, 01:53:54 PM »
Stew,

Kind of, been away a few nights which messes up your whole routines! Then I've been doing some bits and pieces tidying the car up. I'm off for a week now so am hoping to get back in the workshop and finish that 2nd poppin. Got the electric loco to finish then I was going to do an i.c. engine, but I've changed my mind, I either want to do a boiler for mabel or do sweet pea-  I have a professional boiler for that and I think I bought most of the fittings. Decisions decisions!

Nick
Location: County Durham (North East England)

Offline sbwhart

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Re: Southworth Engines Boiler Feed Pump
« Reply #49 on: April 24, 2011, 01:34:34 AM »
Blimey Nick


 
Quote
I'm off for a week now so am hoping to get back in the workshop and finish that 2nd poppin. Got the electric loco to finish then I was going to do an i.c. engine, but I've changed my mind, I either want to do a boiler for mabel or do sweet pea-  I have a professional boiler for that and I think I bought most of the fittings. Decisions decisions!


Sounds like you've got a dose of  :proj:

Sweet pea sounds interesting I've got a project planned for some time in the future that would use a Sweet pea boiler, but first I've got to finish off my own Mabel first.

Have fun  :D

Stew




Stew
A little bit of clearance never got in the road
 :wave:

Location:- Crewe Cheshire