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'Bachmann' Porter 'B.P.R.C.' Conversion - On30
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 Posted: Sun Feb 14th, 2021 09:27 pm
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bobquincy
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I tried to make this simple, I really did. 
It was not to be.


Most of my battery powered conversions use a low voltage motor,
I don't like to use step-up converters to drive motors,
since we are throwing away 20% of our battery power to begin with. 


The Porter uses a N20 motor, easy to find in various voltage ratings. 
I found some 3 Volt N20 motors for about $2 each, score! 

The motor shaft is 1.0 mm, ever see a 1 mm gear puller? 
Ok, so that's tool #1 I have to make with some 0.9 mm shaft,
and an adapter for my gear puller. 

The motors never arrived (from China) so I sent an email to the seller,
and they promptly sent two more, good customer service. 

The new motors are "kind of" N20, about 0.5 mm longer than the original. 
I was able to file/sand the original bracket, and take off enough to fit the motor.

The worm was held on the shaft with Loctite 641, a good gear/shaft adhesive.

The new motor has really strong magnets, usually a good thing,
but the motor also cogged excessively, not good... 

Worse, the motor drew much more current than the original,
more than the radio receiver (Deltang Rx41, 400 mA rating) could provide.
 

This project needed another motor.

I bought a Maxon 10 mm 3 Volt motor to use in the Porter,
but fitting it looked difficult.
 

I had some 8 mm 3 Volt Faulhaber motors so maybe one of those would fit. 
They came installed in a gearbox and the pinion gear was spot welded onto the motor shaft! 

Crushing the pinion (steel, don't use your good wire cutters)
and carefully filing the shaft welds, allowed me to remove the remnants of the gear.















Fix the worm onto the motor shaft (more Loctite 641)
and now I need a new motor bracket to fit. 

I could have used a big glob of silicone, but that is not what I do,
it needs a real motor bracket. 

A few hours with a piece of ABS in my mill, and we have a bracket. 
Except the Porter frame also needs a small cut, which I really tried to avoid. 

Clamp the Porter frame onto the mill,
and take a small cut to clear the motor, then clean out the chips.
Now we're getting somewhere! 

Cut down a pair of M 1.6 screws to mount the motor bracket and it all fits,
gears mesh, and runs nice and quietly on a power supply.


A Deltang Rx60 fits easily where the DCC board used to go. 
Wire it up, bind to the transmitter, a little programming, and we are good to go. 





I have not figured out what battery to use and where it will go yet,
so for now it is just placed in the cab.


Thanks Tom, for providing this neat little locomotive!  :)

https://youtu.be/mvTyvyLa3uk




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 Posted: Mon Feb 15th, 2021 02:25 am
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Michael M
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Bob,

Very nice job!

I also strive for keeping things simple; hardly ever works.



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 Posted: Tue Feb 16th, 2021 08:08 am
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fallen
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Hi Bob

Perseverance paid off, it looks a good job.

Can you put the battery and/or the electronics up in the roof of the cab?
It will be out of sight there unless you pick the loco up and turn it over.

Frank


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 Posted: Fri Feb 19th, 2021 05:56 pm
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Bob R
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Just tuning in so may be late in offering ideas.

I converted a Porter 0-4-2 a while back,
which of course has a bit more room with the rear fuel bunker. 

The battery can certainly be mounted under the cab roof though and not be visible. 

I used DelTang with a Pololu 9 Volt step up regulator and a 250mAh Li-Po battery. 
I used a reed switch and installed a charge jack on the frame.

I found there is room over the motor for the receiver,
and along side the firebox for the regulator. 

The pad on left is a solder pad to facilitate battery and charge jack wiring.







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 Posted: Fri Feb 19th, 2021 06:00 pm
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Bob R
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The charge jack is visible on bottom of the frame just behind the step.







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 Posted: Fri Feb 19th, 2021 06:04 pm
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Bob R
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As stated the battery is installed in the fuel bunker. 

It is a nice running little engine with about an hour of run time. 

Time would be about two hours with a two cell battery,
or with a 5 Volt regulator and a low voltage motor.







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 Posted: Fri Feb 19th, 2021 07:47 pm
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bobquincy
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Nicely done!

You didn't remove the original motor,
which may mean you are smarter than me,
or at least less inclined to go looking for trouble.

;)

boB




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 Posted: Sat Feb 20th, 2021 07:16 am
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fallen
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That looks a nice installation Bob.

Very neatly done.

Frank


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 Posted: Fri Feb 26th, 2021 02:05 pm
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Si.
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Hi boB  :wave:


You do realise that those On30 'Bachmann' Porters ...

... require a whopping great 100% more rail ...

... than you're used to !!  :shocked:  :P  :shocked:


:java: ;)


Si.




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 Posted: Fri Mar 5th, 2021 01:18 am
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bobquincy
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Metal rails (two of 'em), metal wheels, complicated turnouts...

This is a whole new world!

boB




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