Something I've noticed while looking at 2 axle bogie options for NZR diesels is something that should have been screamingly obvious to me all the time.
Now we all know that the bogies under the De, Ew and D/Dm/D sets are (to all intents and purposes) the same. The scale bogie wheelbase is 20.2mm (2438mm) and the wheel diameter 7.7mm (927mm).
Next, lets have a look at other shunters measurements.
The wheel size is identical for all 4 locos 7.8mm or 940mm, and I'd defy any reader to pick the difference between 7.7mm and 7.8mm under a loco. The bogie wheelbase is 20mm (well, apart from the Dh at 17.3mm which is close to the Gp series bogies at 16mm), which is basically identical to the English electric bogies above.
What about (most of) the rest.
Here we have a variation of 20mm to 20.8mm (again, try picking that under a loco from 2'). The wheel variation is a bit wider (9.2mm to 7.2mm).
The only other loco not on these pages is the Dj. 18.4mm with a wheel dia of 7.8mm.
So, apart from 2, the rest of these loco's could be made from 1 bogie drive system with just a variety of wheel sizes.
3 comments:
So, if wheelsets and appropriate gears can be sourced, one design of 3-D printed chassis would be suitable for all of them?
Phew that means I don't have to re-do these bogies :D
Yes to both. Atlas/Kato do all the intermediate gears and worms, and Kato SD70 wheels are 7mm diameter, but as far as I know the largest in their US range (though the Kato Japanese Bo-Co-Co-Bo is 8mm).
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