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Old 10-08-2017, 06:28 PM   #1
abby
 
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Default a 5" gauge GWR Castle class loco

It has been well over a year since I started this project to supply castings for the title engine, done a lot of other things too , in-between , but I have just finished the bogie support frame casting,




this is the large casting that sits below the inside slide bar frame , as shown in the cad assembly drawing.



Although a large casting weighing half a kilo the walls , at 3/32" , are quite thin and getting usable wax patterns
from the rubber mould proved tricky.
After several attempts and much re-working of the mould I was eventually successful.








Just noticeable in the cad assembly drawing is the centre pivot bearing , coloured blue ,
this bearing , as it says , allows the required pivoting movement of the bogie,

I cast it in phosphor bronze as there is a lot of weight and movement on this part , which actually runs in a pair of steel liners







All in all a very satisfying job !


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Old 10-08-2017, 09:52 PM   #2
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