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Farish 0-6-0 conversion to power bogie- centre axle only powered?





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#1 scaro

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Posted 14 September 2018 - 08:06

Farish GP tank chassis Poole.jpg Hi 

 

Ancient Poole Farish 0-6-0 GP tank (?) chassis, which in theory might make a good power bogie for a C-C 3mm scale loco (10.5mm gauge.)  Wheelbase (31.75mm), and wheel diameter (8.9mm) just right.  Sturdy looking, with metal worm and gear on centre axle.

 

Problem -  need to remove the drive rods, which power the inboard and outboard axles. Once you do that, chassis is only powered on the centre axle, which would be pulling one axle and pushing the other.  Doesn't sound ideal. 

 

Looks hard to modify, without a lot of surgery plus a new motor with new shafts, and I'd have to harvest another geared axle from another loco. I also wonder whether the worm is a special design as it is inclined,  as you can see motor and shaft are tilted down at an angle. Maybe someone out there has done it?

 

Wondering if anyone's ever tried to use a pair of them as power trucks as they are, and how they performed? Two axles powered on a C-C loco is not unknown in older N scale. But usually that would be powered front & centre axles on one truck, with the other free truck rolling. 

 

In this case there would be two swivelling trucks with centre axle powered on each. Loco would not be expected to move faster than a scale 40mph or pull more than ten bogie wagons. 

 

Hmmm, work or not work ? 

 

Ben 


Edited by scaro, 14 September 2018 - 09:35 .




#2 34theletterbetweenB&D

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Posted 14 September 2018 - 11:31

Not work well!

 

What you are looking at is two thirds of the model's weight on unpowered wheelsets with wiper pick ups to add drag. Unless prepared to put traction tyres on the two driven wheelsets, there's a high probability that it would barely move itself. That's before dealing with any matching issues between the two mechanisms, and the general flakiness of GF products of the period. (The worm is absolutely standard, may lie at any angle, so long as it is tangent to the pinion it engages.)

 

Since you are looking at extending axles anyway, why not new 10.5mm gauged wheelsets transplanted into the drive of current Farish class 40 or 45: should offer about the right bogie wheelbase, significantly superior single motor and shafts to an all gear coupled drive train? Only you know whether the bogie centres woud be usable for your planned prototype...



#3 DavidCBroad

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Posted 14 September 2018 - 20:21

Centre axle drive on a 2-2-2 with pickups on the outer axles, not a question of whether t will pull 10 wagons more a question of will it move itself.   Its a nice 0-6-0 chassis, too long for a rod drive C-C but ideal for a small 0-6-0 deisel shunter.   There are plenty of more suitable C-C and B-B chassis available without ruining this chassis.


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#4 kevinlms

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Posted 15 September 2018 - 09:24

Centre axle drive on a 2-2-2 with pickups on the outer axles, not a question of whether t will pull 10 wagons more a question of will it move itself.   Its a nice 0-6-0 chassis, too long for a rod drive C-C but ideal for a small 0-6-0 deisel shunter.   There are plenty of more suitable C-C and B-B chassis available without ruining this chassis.

Maybe its for a model of 'Hurricane'?



#5 scaro

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Posted 16 September 2018 - 11:51

Not work well!

 

 

Since you are looking at extending axles anyway, why not new 10.5mm gauged wheelsets transplanted into the drive of current Farish class 40 or 45: should offer about the right bogie wheelbase, significantly superior single motor and shafts to an all gear coupled drive train? Only you know whether the bogie centres woud be usable for your planned prototype...

 That's something else I'd considerered. What is the wheelbase of the Farish 40 or 45 - between the powered axles ? 


Edited by scaro, 16 September 2018 - 12:08 .


#6 34theletterbetweenB&D

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Posted 16 September 2018 - 17:38

Here is a UK D+E traction wheelbase table, that is a very handy thing indeed for these kind of questions.

http://www.clag.org.uk/wheelbase.html

Happily most current RTR conforms closely to prototype in respect of wheelbase.


Edited by 34theletterbetweenB&D, 16 September 2018 - 17:39 .


#7 scaro

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Posted 17 September 2018 - 08:19

Know that site well. 

 

The likelihood of a model conforming to that site's data is better than it used to be.  

 

But still the only way to know is to have a caliper measurement of an actual model.