attaching coupling rods

[Perko7Participant @perko7]

I'm at the stage of making crankpins for my 5inch gauge loco and i am unsure as to how the coupling rods are retained on the crankpins. I've searched through my available ME magazines from the 50's and 60's but every reference I've found usually dismisses this detail as having been 'described many times previously".

Can someone please tell me how it is normally done? I don't want to have to remove and remake crankpins after they've been pressed home.

The original drawings for the full-size loco shows threaded ends on the crankpins with special shaped nuts which are also pinned once fitted, but this seems a bit fiddly for a miniature version.

All suggestions gratefully received.

Geoff P.

[Perko7Participant @perko7]

[nigel jones 5Participant @nigeljones5]

If your not bothered about copying the original the simple options are to use a captive nut as you describe or put a retaining collar on held in place by a taper pin.

[Clive HartlandParticipant @clivehartland94829]

The connecting rods on my 9F are held in location with a thin washer and a c/s screw into the pin. The edges of the washer are bevelled at 45 deg.

[Neil WyattModerator @neilwyatt]

Thread end of crankpin smaller diameter than bearing surface, fit washer, fit nut with a drop of retainer.

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