Loco mounting jig

[Garry Coles]

Hello everyone.

I’m currently building Doug Hewsons BR Std Class 4 2-6-4 Tank loco in 5 in gauge.

I’ve got the whole chassis mounted at each end on the buffer beams centrally through the draw hook holes with 5 mm bolts and with spigots going into the buffer mounting recess’s also using 5 mm bolts. The whole loco is then supported by a swivelling rig so that I can work on the top and the bottom just by turning it over. My question is, do you think those mounting bolts will be strong enough (in shear) to take the weight as I’m constructing it. Or do I need to add some extra mounting fixtures. The finished boiler alone weighs 40lbs.

I don’t seem to be able to find the weight of the finished model on the internet.

Any suggestons please.

Garry in sunny Jersey

[chris vine]

Hi Garry,

Looking at the table, first one I found, eurocodeapplied.com/design/en1993/bolt-design-properties
the design shear strength for a 5mm bolt using the lowest strength in the table is over 2 kN. Or 200 kg

At a complete guess I would think that the finished engine might be of the order of 100kg.
So, if you have got the load spread between 6 bolts, then you have a factor of safety of something like 12.

However, other calculations are available!!

Chris.

[GWR 101]

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