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Sizes for drawbar couplers ??

BasilFawlty

Joined: 17-09-18

Topics: 2

Replies: 2

Posted: Fri 21st Sep 2018, 4:41pm
Sizes for drawbar couplers ??

Can someone give me the recommended sizes for a solid bar-type coupler on the back of a scale loco in 7.25"gauge ??..
 

Replies To This Post

Richard S.

Joined: 1-01-91

Topics: 9

Replies: 17

Posted: Fri 21st Sep 2018, 11:28pm

I would use either 8mm if you plan to haul a couple of coaches or 10mm if you plan to haul heavy loads.
 

BasilFawlty

Joined: 17-09-18

Topics: 2

Replies: 2

Posted: Sat 22nd Sep 2018, 12:25am

Thanks for replying Richard..........what I meant was can someone give me the length x width x thickness plus diameter of holes (That would be your 8 or 10mm I think ? ) --- plus the pitch between them..
 

Mick

Joined: 1-01-89

Topics: 9

Replies: 163

Posted: Sat 22nd Sep 2018, 8:27am

Much depends on the carriage size, is it scale or a large sit astride carriage for example? A flat mild steel bar 20mm x 6mm x 150mm with 8.5mm hole for 8mm diameter clevis pins with R clips for security is adequate unless you are into heavy passenger haulage. If the coupling pockets are not level with each other it's imperative to crank the coupling bar so that both ends lie horizontal and parallel to each other. It's useful to mark a line across the flat head of the pin to show where the R clip hole goes through the pin, this makes inserting it easier! I hope that helps.
 

BasilFawlty

Joined: 17-09-18

Topics: 2

Replies: 2

Posted: Sat 22nd Sep 2018, 10:00am

Thanks Mick-------given the relative small size of the GWR 1366 loco I don't anticipate hauling much more than one or two passenger vehicles.....I thought I might fit one of those multi- height option coupling brackets to the driving truck to cater for that height situation that you mentioned----- but a cranked coupler or two in the travelling tool box wouldn't go amiss in any event.........I like the idea of marking the head to show where the hole is....
 

Richard S.

Joined: 1-01-91

Topics: 9

Replies: 17

Posted: Sat 22nd Sep 2018, 9:20pm

sorry late night post! Should have said 8mm or 10mm clevis pin and fork end, easily sourced on Ebay for example.

https://www.ebay.co.uk/itm/Clevis-Pin-And-Fork-End-Long-Joint-M4-M5-M6-M8-M10-RH-Zinc-Plated-Steel-x1/323370901228?var=512439347354&hash=item4b4a685eec:m:m435exBBgGr69KPBOVCOJYw

I usually use the 10mm and fit a compression spring either side of buffer beam (approx 3/4" long with about 1/2" hole in centre (We use a suitable one from Parkside Railways. Use 8mm thick steel coupling bar minimum 25mm wide. Ensure end of bar is radiused to allow it to pivot in hole.
 
 
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