Coronado Scale models in Phoenix have the Eames diaphragm brake cylinder in their range of O scale brass castings, as well as the round cylindrical style on vacuum brake cylinder used on some Maine Two Foot lines such as the Bridgton.

Terry2foot

Quote from: Jim Banner on June 26, 2008, 06:30:24 PM
[

0-gauge is 1.250" which should make 0-scale 56.5/1.250 =  1:45.2.  British 0-scale is usually 1:45 while American 0-scale is usually 1:48.  One is a little large while the other is a bit small.  Then we get into 0n30 where the ratio is 30/.65 = 1:46.2, which is neither of the 0-scales.  Arghh!

Jim,

British O scale is 7mm to the foot or 1/43.5 scale.

US On30 actually scales out as a 31 and a bit track gauge because the scale is 1/48th or quarter inch to the foot.

Terry2foot

Quote from: Jim Banner on June 12, 2008, 11:01:29 AMI agree about brass being mostly copper and zinc with other elements added, but bronze is another kettle of fish.

Jim,

you actually have the answer which is that bronze without any qualification is a copper based alloy with a deliberate addition of tin.

Any other sort of bronze normally has additional words added such as phospor bronze, aluminium bronze, manganese bronze, silicon bronze, aluminium nickel silicon bronze which specify the addition(s) (not necessarily metals) which give that bronze its particular characteristics and properties. And these other bronzes need not necessarily contain tin. 

My understanding is that the reason the Liberty Bell cracked was more to do with the inner mould characteristics than the material composition,


Terry2foot
 

Quote from: Jim Banner on June 09, 2008, 08:50:53 PM
Perhaps the best definition comes from the University of Windsor Dept. of Engineering and viewable at this site:
http://staff.washington.edu/ryanlee/Engine/UofWindsorManual/Bearings.htm

Take care, whilst this document contains useful information it also contains fundamental mistakes, such as "bronze is an alloy of copper and zinc", and over simplifies others, note that most bearings of any sort rely on an oil film to separate components and ultimately reduce friction and wear.

Brass is an alloy of copper and zinc as major constituents, bronze is an alloy of copper and tin as major constituents. 

Anti-friction is the historic generic name for what are now commonly called rolling element bearings, to distinguish them from what were then called friction bearings.


Terry2foot 

Another "anachronistic" layout is the Roland Emmett inspired "Far Twittering and Oysterperch" at;-

http://www.warley-mrc.org.uk/far_twittering.htm

Enjoy!

Terry2foot

The Stonehenge layout is shown at;-

http://www.oldcopper.co.uk/railroads.htm

Terry2foot

Remember that Kens number are for a three foot railway, and that the closest prototype to the Forney's were two foot lines.

Two foot cars are a lot lighter. Published data gives the weight of two foot flat cars as 10100 pounds to 11000 pounds for lengths of 26 foot to 34 foot and one figure of 14100 pounds for boxcars of the same lengths.

Scott's posting is a better guide for the Two Footers

Terry2foot

Clover House make both PCB and wood ties in a range of sizes.

The PCB ties come with wood strips to make them the same height as the wood ties.

I find the "S" scale standard gauge ties suitable for the handlaid track on my On2 layout. They have to be cut to length, but I don't find that a problem. You might find that these also work for On30.

I use the PCB ties at intervals for turnout/switch construction, and at the end of sections on plain track, and fill in with full height wood ties elsewhere.   


Terry2foot

Scot,

be careful about "Forneys in reverse".

Note that the original configuration of Ariel and Puck on the B&B, ie 4 wheel truck forward, cylinders and smokebox at the rear is the basis of the Forney patent.

The SR&RL rebuild with cylinders and smokebox forward and 4 wheel truck at the rear means they are operating in reverse (to the patent).

What complicates this issue is that the locomotives were still designed by Forney so perhaps the correct designation for the SR&RL locomotives is designed by Forney, but not conforming to the Forney patent.

Terry2foot.

The patent can be viewed on line, there was a reference to it at http://groups.yahoo.com/group/MaineOn2/message/3447,  for others Matthias Forney's original patent (number 52406) can be viewed on the US Patent Agency's website (Google "us patent" to find the site).


 

Scot,

it was simply a length of "overlapping" track approached by both gauges from different ends to give both access to the coal shed. The arrangement did not need dual gauge turnouts.

It is shown in Trevor's schematics of track layouts recently posted on the Maine On2 board files, so you don't need to buy any books


Terry2foot

Scot,

there was a short length of 2 foot gauge and standard gauge "dual gauge" track next to the coal shed at Bridgton Junction on the B&SR/B&H.


Terry2foot

Tom,

russ simpson is currently offering track gauges on eBay, search for item 200129444521 and you will find him.


Terry2foot
 

To get back to the original question posted by Tom, the answer may be to try Russ Simpson.

Russ used to build custom trackwork, and one of his adverts featured a dual gauge (possibly US O/On3) stub turnout threaded by a near 90 degree crossing (also dual gauge). A very impressive statement of capability.

I do not have a website reference for Russ, but he is active on selling pointwork through eBay. Take a look under O scale and you might find him,


Terry2foot
 

I don't know whether the Bachmann Forney will work on code 55 rail, but I do know that code 55 rail is very difficult to work with compared to codes 70 or 83.

Also the "prototype" engine that is the closest to the Bachmann Forney had a higher weight on the drivers (30000 pounds total) than was permitted by the prototype rail which equates to code 55;-

Model          Prototype
Code       Weight/yard       Axle load (tons)

40       12          2
55       25          5½
70       35          9
83       55          16½
100       85          36   
 
But's it your choice,

Terry2foot

Getting back to Chris R's original question, it seems that nobody has yet  stated that there must be a complete circuit for electricity to flow, and that the resistors are connected across the traction motors at both ends.

And that what happens in dynamic braking is that the kinetic energy of the train is converted firstly into electrical energy in the traction motors and this energy is then converted into heat energy in the resistors and dissipated into the atmosphere, as a result of which the train slows down.

In mechanical  braking, the action of the brake shoes on the wheels again produces heat which is again dissipated into the atmosphere, but this time wear (brake shoes and wheels) also occurs.


Terry2foot