Cumbrian 4" Showman

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Re: Cumbrian 4" Showman

Post  Mick1020 on Wed 03 May 2017, 10:49 pm

Looking Fantastic John

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Re: Cumbrian 4" Showman

Post  ejparrott on Wed 03 May 2017, 11:31 pm

Under the UK Model Engineering club scheme there is no reason to have the cladding off for a steam test. Can't comment on commercial inspectors.
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Re: Cumbrian 4" Showman

Post  Robfishman on Wed 03 May 2017, 11:47 pm

I guess as ever it depends on the boiler inspectors qualifications, but I read somewhere that the 4" boiler caracity was to big for most model engineering clubs to test, so we would need a commercial test? I could be wrong though.
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Re: Cumbrian 4" Showman

Post  JayBee on Thu 04 May 2017, 7:14 am

At the moment I am still looking for an inspector as the local clubs that I have spoken to only cover Copper boilers so are not covered for the STW miniatures.

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Re: Cumbrian 4" Showman

Post  lynnr on Thu 04 May 2017, 9:19 pm

Hi


My commercial (RSA now British Engineering) inspector wanted the cleading off for first inspection as it is a new boiler to the inspector. Since then all that he wants for cold inspection is, safety valves off, sight glass opened and a rod to show clear passages, pressure gauge off to test against his calibration, fusible plug out for inspection and all plugs out for boroscope.

He did complain the first time about boroscoping the boiler. My scope is better than his.

Once the boiler is due its next hydraulic, depending on internal cold inspection will be between year 7 and 10. Then the cleading will need to be off.

"In service" test. Is visual inspection all round for steam leaks. Lift safety valves with accumulation test. Sight glass blowing routine. Demonstration of both mechanical water pump and steam injector for water gain in the boiler.
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Re: Cumbrian 4" Showman

Post  JayBee on Fri 05 May 2017, 7:42 am

Thanks that is helpful

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Re: Cumbrian 4" Showman

Post  ejparrott on Sat 06 May 2017, 8:26 am

Under the club scheme we can test boilers up to 500bar/litres. We can go to 1100 Bar/Litres if we inform our respective federation that our inspector is doing it. That's a big boiler. If you took 180psi as an operating pressure, the boiler would have to be 40 litres capacity to tip over that mark, then to go to the 1100 absolute limit it would have to be 90 litres. Raising the pressure reduces the volume allowable, lowering the pressure increases the volume allowable. To date we at Rugby haven't bothered registering ourselves as over the 500bar/litre limit.
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Re: Cumbrian 4" Showman

Post  JayBee on Sun 21 May 2017, 10:03 am

ejparrott wrote:Under the club scheme we can test boilers up to 500bar/litres.  We can go to 1100 Bar/Litres if we inform our respective federation that our inspector is doing it.  That's a big boiler.  If you took 180psi as an operating pressure, the boiler would have to be 40 litres capacity to tip over that mark, then to go to the 1100 absolute limit it would have to be 90 litres.  Raising the pressure reduces the volume allowable, lowering the pressure increases the volume allowable.  To date we at Rugby haven't bothered registering ourselves as over the 500bar/litre limit.

Thanks for the detail and sorry for the delay. Is the boiler volume based on total volume i.e. with or without the deduction for the fire tubes and stays. By my quick calculation my boiler is 507Bar Lt based on the total volume but only 430Bar Lt if I deduct the stays and fire tubes. This will be the total water volume.
This is not far from Lynn's video giving I think 10 gal to fill the boiler from scratch.

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Re: Cumbrian 4" Showman

Post  JayBee on Sun 21 May 2017, 10:23 am

Work has now moved on to the drive and to the crank assembly. The gears required little other than dressing all the sharp edges and painting for those on show.



Alignment of the shaft took a little tweaking and time to get running nice an smooth.All the mating gears tested and checked for fit and movement. Once sorted final coat applied whilst off the engine and then back into place.



Crank trial fitted and a little lapping brought everything along well.



Valve eccentrics were all numbered and kept strictly in individual sets and orientation so that they would go back exactly the same each time.



And a few happy hours later everything is smooth when tested off the engine. There may be further work once everything is in alignment on the engine. These would look fantastic all polished up but I am giong for a painted finish to be closer to Ex Mayor's scheme.



Four little oil pots.



And the the final look to see things so far. I will have to wait to fit the eccentric linkage.


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Re: Cumbrian 4" Showman

Post  lynnr on Sun 21 May 2017, 6:03 pm

Looking excellent!

The water measurements I did was with a 2pt jug so should be very close. I only went to above the top nut so a few pints more needed to get to total boiler volume.
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Re: Cumbrian 4" Showman

Post  ejparrott on Mon 05 Jun 2017, 11:18 pm

JayBee wrote:
ejparrott wrote:Under the club scheme we can test boilers up to 500bar/litres.  We can go to 1100 Bar/Litres if we inform our respective federation that our inspector is doing it.  That's a big boiler.  If you took 180psi as an operating pressure, the boiler would have to be 40 litres capacity to tip over that mark, then to go to the 1100 absolute limit it would have to be 90 litres.  Raising the pressure reduces the volume allowable, lowering the pressure increases the volume allowable.  To date we at Rugby haven't bothered registering ourselves as over the 500bar/litre limit.

Thanks for the detail and sorry for the delay. Is the boiler volume based on total volume i.e. with or without the deduction for the fire tubes and stays. By my quick calculation my boiler is 507Bar Lt based on the total volume but only 430Bar Lt if I deduct the stays and fire tubes. This will be the total water volume.
This is not far from Lynn's video giving I think 10 gal to fill the boiler from scratch.

Completely full of water, no air, as if presenting for hydraulic test
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Re: Cumbrian 4" Showman

Post  JayBee on Sun 11 Jun 2017, 8:22 pm

The build is getting to the limit of my hydraulic table now, so time to put her on the wheels.



Because the table won't go low enough I am going to have take the weight of the engine to get the trolley out. Front perch bracket is on an axle stand with the strop acting as extra security.



I doubled up at the back end as well. timber across the tow strap, jack in the middle and axle stands to make sure that it doesn't slip or tilt sideways.



A little bit at a time and she is down. Phew!


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Re: Cumbrian 4" Showman

Post  JayBee on Sun 11 Jun 2017, 8:40 pm

More Nikel plating for the steering rod. I wasn't sure how to get the whole shaft into the plating solution until someone suggested a plastic gutter.


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Re: Cumbrian 4" Showman

Post  JayBee on Wed 28 Jun 2017, 8:22 pm

A little while since my last update but things haven't been idle.

At my last post I had been busy on some of the motion work, progress has been made in getting everything lined up properly and they are really starting to come together but still a little more to do yet to complete.
I have also finished most of the work on the belly tank and the steering. Not yet sure about the steering chains though. On full lock it looks as though the chain on the tight side will rub on the inside of the front wheel. Having looked at some full size engines I have noticed that one or two have an additional chain across the engine linking the two chains as if to hold them together and off the front wheels when on lock. I'm not sure if anyone else has experienced this.



Also still deciding whether to use wood or fibre for the lagging although these pieces in the photo are just to get the spacing for the cleading rings. The belly tank will have to come off to finalise the cladding.

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Re: Cumbrian 4" Showman

Post  JayBee on Wed 28 Jun 2017, 8:34 pm

Link chain on full size engine. I have just realised I think that this is to limit the steering lock not to hold the chains in. Embarassed


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Re: Cumbrian 4" Showman

Post  lynnr on Wed 28 Jun 2017, 8:51 pm

Hi

The lock chains as supplied need adjusting so that when the steering chain is close to the rim when on full lock. It will not cause a problem. Mine are set so the steering chain just touches the rim.
The cross chain on your second picture is in place of the chains to the belly tank as performs the same function.


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Re: Cumbrian 4" Showman

Post  JayBee on Wed 28 Jun 2017, 9:11 pm

Thanks Lynn, so they can be close but not quite touching. I will have a go.

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