Building a 31/2" Gauge Locomotive Engine

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Bernd:
Sure looks like a tight fit with all those parts in there.

Would like to see that in motion. Nice work Stew. :thumbup:

Bernd

sbwhart:
Well this has been a good and bad day

Made the gaskets for the cylinders using the gasket material John gave me:- thanks John

This is the gasket for one of the cylinder covers

Then spent some time fixing the studding to hold the valve chest in place but ran out of 6BA studding :bang: Ok so I've got to go to Macmoddels today to get some along with some other bits a pieces. When I told the Boss I was planning on going to Macclesfield she said:- " ho ther's a good furniture shop in Macclesfield I'll come with you and we can look for new sofa and chairs"

££££££££££££ Translation $$$$$$$$$$$

Dam Dam Dam,

Any way assembled all the linkage sorting out the pins etc, quite happy with the results and fairly confident that it will work.

As you can't see it very well when its inbetween the frames this is it.

Then desaster I placed it up against the cylinder to see how it lined up with the valve rods.

Spot the deliberate mistake:-

I've off set the arms 1/8" too much. :bang: :bang: :bang: :bang: don't know how I did this probably measured from the wrong point.

So option for putting it right 1:- Re bend them 2:- Re make.

I think I go for option 2 it wont take too long and I was not too happy with result from bending the crank method, I think I'll fabricate them up using a different method.

My scrap collection is growing

Still having fun

Stew

bogstandard:
What's the fun in having everything fitting perfectly every time Stew?

It is little things like that which remind us all that we are only human.

John

28ten:
I'v just read right through this, really good stuff. I like the way you have made the crossheads, I think it would translate to a smaller scale, so if i get some milling capability I will try it.
I am intrigued at the way you fitted the hornblocks and them made the rods to fit. In small scale the accepted method is to make the rods first and to use them as a jig for setting the hornblocks.
Anyway good stuff, I wish i had the ability to do something similar myself

sbwhart:

--- Quote from: 28ten on August 03, 2009, 02:08:00 PM ---
I am intrigued at the way you fitted the hornblocks and them made the rods to fit. In small scale the accepted method is to make the rods first and to use them as a jig for setting the hornblocks.

--- End quote ---

Thanks for your encouragement Chaps

Hi 28ten

By rods I take it you mean bearing blocks.

I just followed the recommended way from books for fitting the hornblocks and bearings for this scale, the critical feature is getting everything square and in line, in smaller scales this must be as equally important, but I guess the smaller size allows you to use different methods.

I was really pleased how that method for making the cross head worked out, everything fitted together without any fettling, I just thought it would be a better method to those recommended in books so I tried it: a lot of the literature on building locos dates from the 1960 - 70, so I think it was written around what kit was available in the average workshop then, we've moved on since then.

Thanks again for you input

Have fun

Stew

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