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4012 Big Boy

Postby JoeMalinchak » Tue May 09, 2017 5:07 am

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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Re: 4012 Big Boy

Postby Switcher102 » Sat Jul 15, 2017 10:24 am

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
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Re: 4012 Big Boy

Postby Switcher102 » Sat Jul 15, 2017 12:57 pm

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Re: 4012 Big Boy

Postby MMBUFBerlin » Wed Nov 14, 2018 11:58 pm

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
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Re: 4012 Big Boy

Postby MMBUFBerlin » Thu Nov 15, 2018 10:09 am

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
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Re: 4012 Big Boy

Postby rail450 » Thu Nov 15, 2018 10:28 am

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
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Re: 4012 Big Boy

Postby MMBUFBerlin » Thu Nov 15, 2018 12:19 pm

[MODERATOR EDIT]Comment removed [?MODERATOR EDIT]

Pictures:
MALLARD_CurrentPickUp.jpg
MALLARD Current Pick Up
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CurrentPickUp.jpg
Current Pick Up
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Re: 4012 Big Boy

Postby rail450 » Thu Nov 15, 2018 4:38 pm

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
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Re: 4012 Big Boy

Postby MMBUFBerlin » Thu Nov 15, 2018 5:19 pm

{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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Re: 4012 Big Boy

Postby dkightley » Thu Nov 15, 2018 6:08 pm

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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