Charlie Q1

[Mike WainwrightParticipant @mikewainwright87512]

I have all the issues of the build series saved but I cannot find the drawing of the Steam Chest. Please can somebody let me know what issue it is in.

I am drawing it in Solidworks and cannot find the drawing

[Mike WainwrightParticipant @mikewainwright87512]

[John PurdyParticipant @johnpurdy78347]

Mike

The drawings for the steam chest and cover are in issue #4373, 12 March 2010.

John Purdy

[Mike WainwrightParticipant @mikewainwright87512]

Thank you John. i must have missed the page when I scanned the pages. I will go back through my magazines and find it.

Regards

Mike

[Mike WainwrightParticipant @mikewainwright87512]

I cannot find that Magazine at the moment. Please could some body give me the dimension between the boss and the offset of the bosses

[John PurdyParticipant @johnpurdy78347]

Mike

I'm not quite sure which dimensions you need, but the bosses are 10 mm dia. centred on the long edge ( back face) of the steam chest at 28 mm centres. The outside dia. of the boss is flush with one edge and the centre of the boss is 7.5 mm from the other edge. The bosses are 12 mm long. The overall outside dimensions of the steam chest are 72 x 55 mm, and 12.5 mm thick. Inside dimensions are 42 x 59 mm ( the 59 dimension is a guess as it is not shown on the drawing but is assuming that the walls are all of the same width). I hope this is clear!  If you need any other dimensions I have all the mags here by me.

John Purdy

 

Edited By John Purdy on 20/03/2016 20:07:36

Edited By John Purdy on 20/03/2016 20:08:32

[Mike WainwrightParticipant @mikewainwright87512]

John

Thanks again. That has saved me looking through all my mags to get the right issue. I have 114 pages saved for this project but I guess I missed that page when I scanned them

Mike

Edited By Mike Wainwright on 21/03/2016 07:21:51

[John PurdyParticipant @johnpurdy78347]

Mike

Mike

I forgot the a few dimensions of the steam chest and cover in my last. The bosses are drilled 4 mm dia and threaded internally 1/4 – 40, 10 mm deep for the valve rods. The cover is 72 x 55 mm outside by 3 mm brass. It has 17 mounting hole around the periphery drilled 3.4 mm, spaced 3 mm in from each edge at the corners and spaced out 11 mm along the long edge and 16.5 mm along the short edge. As well there are two bosses threaded 5/16 – 32 with a 5 mm bore for the steam pipes. They are placed 12 mm from each edge in the corners of one of the long edges. The bosses extend 8 mm above the surface of the cover. There is also a 9.6 mm hole centred on the long dimension and 25 mm from the edge where the steam pipes are situated. This is for the exhaust pipe connection to the blast nozzle. The drawing also shows two through holes tapped 5 BA centred in the short edges of the steam chest. I'm not sure what these are for as there is no mention of them in the text and they aren't shown on the cover, jacking screws maybe?? A dimension I didn't see in my last is it shows the wall thickness of the short side of the steam chest as 6 mm which would make the one I assumed was 59 mm actually 60mm.

John Purdy

[alan-lloydParticipant @alan-lloyd]

The two through holes on the short sides are to hold the steam chest in position so you can set the valve timing

[Mike WainwrightParticipant @mikewainwright87512]

Thanks again for your help. I have it drawn in Solidworks and it looks ok.

[nick feastParticipant @nickfeast85472]

Just noticed this thread, the steam chest casting used on the first build was from the Derby 4F/ Clayton wagon. I have since made a couple of fabricated ones using 1/2" square brass bar and round, silver soldered and milled to size. The two 5BA holes were indeed intended as jacking screw holes as they don't match any threaded holes on the block.

I intend showing the loco built during the series at the Bristol show in August. It has a few differences from the original drawings such as hydrostatic oiler and multiple jet blast pipe. The tender was glued together using polyurethane compound as used in automotive bodies. Only a few small leaks so far, the joint technique needs perfecting!

Nick Feast

[Author]

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