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First Loco Project help.

Prowsee

Joined: 1-01-70

Topics: 1

Replies: 2

Posted: Mon 25th Jul 2011, 11:19am
First Loco Project help.

Hi all.
As a complete newbie to the world of miniature locomotive construction I would appreciate some basic hints and tips. I am designing a ‘sit in’ 7.25” gauge model of an EMD SW-1500 and 4 flat cars with a container cargo that passengers sit in. I am in the process of drawing up a concept model of them in Google Sketch up. The following principles are being worked to so far.
• Structural framework for the body will be 25mm square stainless steel tubing. All plate metal work will be in 3mm stainless steel.
• The loco frame (what sits on the bogies) will need to be high tensile steel bars I guess. (No idea how thick).
• I have no idea what my power plant will be so far but I am thinking a small 3 or 4 cylinder petrol/diesel engine driving a generator then in turn driving a traction motor on each bogie.
• Breaking will be standard hopefully to railways like DVR and others.
• Overall dimensions of the loco are as (H x W x L) 900mm x 600mm x 2,500mm
As you can see this project is barely in its infancy and could at any time be included in TopGear’s “ambitious but rubbish” category.
See below for screen dumps of my drawing progress and some prototype shots.

SW1500 loco:
Prototype:
http://tinyurl.com/3mlmxf6

My Progress:
http://a4.sphotos.ak.fbcdn.net/hphotos-ak-snc6/262527_10150388568448709_522388708_10535085_3767874_n.jpg
As you can see I have not designed the frame yet as I think that part is hardest to sort out.

SRB Car:
Prototype:
http://tinyurl.com/4ydutxc

My Progress:
http://a6.sphotos.ak.fbcdn.net/hphotos-ak-snc6/252052_10150388568358709_522388708_10535084_7910147_n.jpg
The Flat car will only have 2 bogies compared to the 4 on the prototype so no complex articulated framing will need to be engineered.

Positive advice and pointing in the right direction would be a great help. Hopefully this thread will also provide some help for others in the same position.

Thanks in advance.

Prowsee

New member of Dimond Valley Railway.
http://www.dvr.com.au
 

Replies To This Post

Narrowgauge7.25

Joined: 1-01-94

Topics: 16

Replies: 107

Posted: Mon 25th Jul 2011, 11:42am

I would suggest having a look at a few locos already built before committing to your choice of material. Victoria our sit inside diesel has 3mm aluminium bodywork. With careful folding we kept the structural support to a minimum, the rear cab for example has the side folded in so needed no extra structure.

In terms of power if you are thinking 12/24 generators have a look at http://www.smex.net.au/Reference/AlternatorTraction01.php . Victoria has a single pahse 240 volt driving trhough pahse convertors and uses 3 phase motors for traction.

http://farm4.static.flickr.com/3500/4078748994_50abdc9f46_m.jpg

In terms of chassis Victoria used some heavy duty 3x2" and where you are thinking plate draw it and get it laser cut saves a lot of work. My email is available in the address book if you want any further info.
Best of luck Martyn 2212
 

Prowsee

Joined: 1-01-70

Topics: 1

Replies: 2

Posted: Mon 25th Jul 2011, 12:32pm

Thanks for the advice Narrogauge7.25. This is the idea to draw it up in on the computer first modifying the drawing as I learn more before I start cutting metal. I will also go and see more locos. Thanks again appreciate it.

Prowsee.
 

doncottle

Joined: 1-01-70

Topics: 1

Replies: 31

Posted: Mon 25th Jul 2011, 7:55pm

In a few weeks time you will have a good opportunity, (at the A.G.M.)to find some inspiration. (Should the locomotive numbers attending be anywhere near normal). If you intend to visit, I suggest the early or last days would be the best. People generally have more time to talk, because it can be manic at times.
 

Prowsee

Joined: 1-01-70

Topics: 1

Replies: 2

Posted: Tue 26th Jul 2011, 1:06pm

thanks for the info doncottle. Unfortunatly being in Australia will make it a little hard to get to the AGM. but I am looking at other locos at my home club as all the locos are the sit in style. And I welcome any suggestions people here have too.
 

colinedmondson

Joined: 9-08-09

Topics: 3

Replies: 82

Posted: Tue 26th Jul 2011, 9:15pm

At our railway we have two almost identical sit in battery electrics of a similar size, see http://www.cheshirerailways.co.uk/highlegh/index.htm and look for Franklin and Prince.
Main frame is 50 x 25 channel, footplating and buffer beams 6 and 10mm plate. A well runs the full length between the bogies to carry the batteries and the drivers feet, folded from 3mm sheet. The ends of the body are 3mm sheet, with no framing at all, and the sides plywood incorporating doors. The seat is from a mobility scooter and very comfortable. The two power bogies are bought in, two lengths of 150mm wide 6mm plate suspended on springs between the main frame channels are drilled for the pivot pin and the weight is carried by PTFE strips, though roller bearings would have been a better choice. The locos have been put together by the operator of the railway, Andy Higgins. With regards to engine size, a diesel is better worked hard, continuous light use leads to problems. Perhaps better to go for a smaller twin and work it harder? Or a battery electric with onboard charging system, a hybrid, where the engine works hard when in use but is not needed most of the time.
 
 
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