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N15class

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I decided to continue with the well tank chassis. Before I came to Brazil I had got some nice castings from Laurie Griffin, Springs, crossheads etc.

 

The kit has turned brass cylinders, which are very nice but need a lot of work to get LG's slides bars fitted. So I fabricated some using the turned ones for size.

 

Well that was just the start of my problems. The slidebars fitted nicely, but to get the piston rod lined up with the centre of the driving wheels everything sits too high. Site the assembly so the footplate fits the cylinders are too low. Also the centre of the front wheel is above the axle box, badly or very badly depending where the cylinders are.

 

My first thoughts are my cylinders are wrong, in which case I feel the front spring and slide bars by LG will be wrong (which I do not believe as I have never had problems from his range before), as they look right to the present cylinders. I have go a drawing but it is a copy of a copy and the scale bar only has feet and quarters on it. So only of use for reference.

 

At the moment I am having to give it some serious thought of how to progress.

 

First picture are the new cylinders.

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The second show the cylinders sat down to fit the footplate.

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The third the cylinders sat up so the centres line up. As you can see in these two the front axle bearing not behind the axle box.

blogentry-13601-0-72987400-1368132011_thumb.jpg

 

The forth shows the cylinders in the correct place to the footplate but too low for the wheel centres.

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Just to show the cylinders new against the kit one.

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And an over view of the project so far.

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If anyone has a good drawing of one of these I could beg borrow or buy I would be gratefull.

 

I feel I will be rebuilding the front end again. Just do not like doing things twice.

Edited by N15class
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The more I look at the problems with the cylinder/crosshead assembly the more I think it is a problem with the slide bars which because I think are too high over all, this then makes the slightly over large cylinders look correct. I have scale from photos and the rather poor drawings I have, it seems to me the crosshead neads the top and bottom flanges reducing at least by half thier hieghts. Then because the slide bars will be closer together the cylinder diameter can be reduced also. This will lift the axle box by about a millimeter and a half. Which in my reckoning is just about enough. I have not found a clear enough side on photo, to scale the cylinder cover diameter. I am guessing that a sixteen inch cylinder will have about two inches of casting around it, making it two feet in diameter. This is of coarse all assumtion and guess work. I should really try and find a decent and accurate drawing. The two have, have completly different front ends on them.

If any knows of a good drawing I would be gratefull.

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