attaching coupling rods

attaching coupling rods

This topic has 4 replies, 4 voices, and was last updated 22 April 2017 at 18:59 by Neil Wyatt.

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22 April 2017 at 06:28 #294454
Perko7
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@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.
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22 April 2017 at 06:28 #8672
Perko7
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@perko7
22 April 2017 at 08:43 #294465
nigel jones 5
Participant
@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.
22 April 2017 at 10:47 #294476
Clive Hartland
Participant
@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.
22 April 2017 at 18:59 #294515
Neil Wyatt
Moderator
@neilwyatt
Thread end of crankpin smaller diameter than bearing surface, fit washer, fit nut with a drop of retainer.
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