Help with loco build please

This topic has 3 replies, 2 voices, and was last updated 1 November 2019 at 16:18 by mark61.

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1 November 2019 at 11:52 #1878
mark61
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@mark61
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1 November 2019 at 11:52 #435507
mark61
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@mark61
I am building a 5" gauge 0-6-0 "Jinty" whih has inside cylinders and as a result the centre driving axle takes the form of a crankshaft.

The next job is to fit the wheels to the axles. I understand the principles of quartering and have made a jig for this purpose.

My question is, does the crankpin on the centre wheel have to be aligned with a precise point on the crank axle or can I fit it at any random point, just ensuring that the crankpin on the opposing wheel is offset by 90 degrees?

I hope I've explained my problem clearly,

Thank you,

Mark.
1 November 2019 at 16:08 #435533
Nigel Bennett
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@nigelbennett69913
It would be usual to position the outside crankpins at 180 degrees from the adjacent big end. This is for balancing, as the coupling rod assists in balancing out the connecting rod. Not something you can do with an outside-cylinder engine! You may also find that the balance weights on the driving and coupled wheels are very differently positioned to each other. See photos of the full-sized locos.
1 November 2019 at 16:18 #435536
mark61
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@mark61
Thanks for that Nigel, I appreciate you taking the time to help me out. Your answer makes a lot of sense so thats what I'll do.

Cheers,

Mark.
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Help with loco build please

Help with loco build please

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