4012 Big Boy

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JoeMalinchak
Posts: 118
Joined: Thu Jun 04, 2015 8:35 am
Location: Greenfield TWP, Pennsylvania (Near Scranton)

4012 Big Boy

Post by JoeMalinchak »

I started working on my Big Boy. I am very fortunate to have a real Big Boy # 4012 at the Steam Town museum that is around a 40 minute drive from my home. I went and took lots of photos for reference, and I know that I will be taking many more. It will be a very challenging, but fun model to design. I made a four wheel chassis to test, and see how it runs. I only used one bogie for power pick up, so it is running sporadically right now. I am going to test it with the tender I am making for my new 4-6-2 locomotive. I am hoping it will run on the 120mm radius track.

Joe.
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Switcher102
Posts: 37
Joined: Sat Aug 13, 2016 8:25 am

Re: 4012 Big Boy

Post by Switcher102 »

Good luck with this Joe. It would be great to see a T gauge Big Boy. There is someone on the T gauge Facebook page who has done the outside wheel motion for a Big Boy. Don't know what has happened about that, it's sometime since I looked at it, and this forum actually.

Rich

Switcher102
Posts: 37
Joined: Sat Aug 13, 2016 8:25 am

Re: 4012 Big Boy

Post by Switcher102 »


MMBUFBerlin
Posts: 100
Joined: Wed Nov 14, 2018 5:43 pm
Location: Berlin/Germany

Re: 4012 Big Boy

Post by MMBUFBerlin »

Hello Joe,
how is the state of work with your Big Boy? 8 steam wheels cope with the 120mm radius, so much I can tell you.
Kind regards
Uwe

MMBUFBerlin
Posts: 100
Joined: Wed Nov 14, 2018 5:43 pm
Location: Berlin/Germany

Re: 4012 Big Boy

Post by MMBUFBerlin »

Addendum to the power pick up: why do you not lead the current over the steam wheels? They are magnetic, so that steel wires must only to be slightly spring-mounted. They do not even have to have mechanical pressure as they are attracted to the wheels by the magnetic force. Applying power through non-driven wheels only causes additional friction or unreasonable distance between the locomotive and the tender.

Kind regards
Uwe

rail450
Posts: 103
Joined: Thu Oct 27, 2016 7:05 pm

Re: 4012 Big Boy

Post by rail450 »

Hi Joe,

to get current you are contacting the tracks via your bogie over a lenght of approx. 5mm.

You Big Boy will not pass over a point.

Getting current via bogie and via tender will be great and will work perfect!

BR,

Siegfried

MMBUFBerlin
Posts: 100
Joined: Wed Nov 14, 2018 5:43 pm
Location: Berlin/Germany

Re: 4012 Big Boy

Post by MMBUFBerlin »

[MODERATOR EDIT]Comment removed [?MODERATOR EDIT]

Pictures:
MALLARD Current Pick Up
MALLARD Current Pick Up
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Current Pick Up
Current Pick Up
CurrentPickUp.jpg (77.31 KiB) Viewed 3949 times

rail450
Posts: 103
Joined: Thu Oct 27, 2016 7:05 pm

Re: 4012 Big Boy

Post by rail450 »

Hi Joe,

regarding pass over electrical points, pls notice these facts:

> the distance of isolated tracks in the middle of the electrial ponit is about 18mm

> the overall distance between Big Boy´s 4 axles is about 3 X 5,26mm = 15,78mm

If your 4 driving wheels are contacted only, your Big Boy will not pass over electrilcal ponits.

BR,

Siegfried

MMBUFBerlin
Posts: 100
Joined: Wed Nov 14, 2018 5:43 pm
Location: Berlin/Germany

Re: 4012 Big Boy

Post by MMBUFBerlin »

{MODEERATOR EDIT]Comment removed [/MODERATOR EDIT]

in Joe's Steamtown there are no isolated tracks!

[MODERATOR EDIT]COmment removed[/MODERATOR EDIT]

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dkightley
Posts: 1224
Joined: Wed Nov 13, 2013 9:43 pm
Location: Nottingham, UK

Re: 4012 Big Boy

Post by dkightley »

Gentlemen

I've removed couple of unfriendly comments in this thread...and I intend not taking any further action.

This is a family-friendly forum where everyone is expected to be polite and friendly to everybody else. Please don't persuade me to place anyone on moderated posting.
Doug Kightley
Webmaster here and volunteer at the National Tramway Museum http://www.tramway.co.uk

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