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5" Britannia - Jame Perrier drawings

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Bill Cooper18/12/2010 12:05:47
4 forum posts
Hi
 
I am building the loco using Blackgates castings.  I cannot for the life of me see how the Brake cylinder water valve (on sheet 7) fits onto the brake cylinder.  One end of the water valve has a  ¼" x 40 threaded hole  with a countersunk  (to presumably match a pipe and olive), and the other connection is a ¼ " x 40 threded hole.  The brake cylinder has a ¼" x 40 threaded hole at the top.  I cannot find any connector on any of the sheets - to connect the cylinder and valve..
 
Is anyone making this loco (or has made one)? and can put me in the right direction?
 
Bill Cooper
 
Penryn - Cornwall
david w04/03/2011 22:49:16
2 forum posts
hello bill i am also constructing britannia from spinks/perrier drawings my chassis was already started when i aquired it ,i too have been working on the braking system,i have made the cylinder and piston but i have not made the valve you mention yet i have a book on loco construction which shows a brake cylinder with this type of valve attached to top of cylinder to drain water when brake is of ,i think that missing of the drawings is a threaded coupler from cylinder to valve and the end with the seat for the cone must connect by pipe to the operating valve,with this valve with ball sat on top of cylinder ,this is how i see it? i posted a querry in beginners questions regarding gaurd iron thickness as it shows on plan 7/32 which to me is miles too thick? i think the plans are lacking in a lot of ways ,i am a newcomer to model engineering live in sheffield and have been to spinks house when he was alive for some castings ,as he lived in chesterfield.hope any of this is any help to you regards david white
Bill Cooper05/03/2011 17:17:35
4 forum posts
David
 
Thanks for that - I have made the bogie, and on my plans the guard iron (on sheet 5) are 3/32", and that seems OK.
 
My father used to live in Chesterfield, and many years ago on a visit to his parents (I am ashamed to say about 30) he went to Norman's house and bought my plans (I think they cost £25!!!).
 
As I was a poor teacher (pause for violins please) the plans sat in the cupboard for years, and now I have retired I have started in earnest. Hope to finish before I pop my clogs!!!!
 
I agree with your comment about a coupler - that would make sense. I spoke to a chap at Ally Pally exhibition who had a 5" Brit on display - and he has simply drilled down through the piston - bored a seat - placed a ball bearning in the seat and then installed a small rod across the top. He said that as the top of the cylinder filled with water, the ball "floated" and the water drained out.
 
Please get in touch if you think I can be of any help - I have just started the cylinders - Oh how I HATE cast iron.
 
Bill
Douglas MILLS 122/03/2014 14:57:58
1 forum posts

Hi Bill/David

Started building mine many years ago (late 70`s) reached the frames assembled (main) - Tender frames cut then after moving to Cornwall they were attacked by rust - so they were stripped down and treated. Now the Good News have moved back to East Sussex and am looking to get started again - so it`s time to create another workshop and look to getting on with building again - will keep a weather eye out for you both and back to studying JP`s plans. I wish you both well and every success - I remember from the late 70s when studying them how some assemblies/part(s) were spread over many sheets.

Doug

Rick Kirkland 122/03/2014 17:28:31
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175 forum posts

Hello Bill and David. I'm in the same position with the Brit. I live in Chesterfield and got all of my bits from Norm but the plans do leave a lot to be desired. I posted a thread last year asking if any builder had a listing of the plan errors to save me dropping down a black hole and the best advice was to do as some other great model engineer did and check them all with CAD. Brilliant when you have the equipment and the ability but I do not. I've not machined my gunmetal cylinders yet but having looked at them recently I get a horrible feeling that the steam port cores were misplaced when the moulding boxes were rammed. This is going to cause large holes to appear at each end of the cylinders when they are bored. Oh dear! Might have to overbore and fit liners cos I've seen the current price of these items. Knowing Norm he would turn in his grave. My greatest fear was rivetting together assemblies and then finding I have to strip something down cos I should have done section Y before fitting section M and then trying to get part Z in place, if you see what I mean. However, I'm also a believer in learning by mistakes and these are some of the lessons which I dont forget. If anyone offers to share advice with me I shall then share it with you and that way we may get a few Britannias under steam before we croak! Just remember that working this stuff out stops your brain setting like concrete and that you're not alone in this, the King of hobbies!

Regards

Rick

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