Number of entries: 21 Number of pages: 3
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Name: David Elwyn
From: Bedford
E-mail: Contact

The unknown gentleman behind the plant talking to Peter Squibb and Brian Clarke on the Dawn till Dusk page is Ivan Smith, of Southwark Bridge Models.

Added: 25 February 2010, 01:00:32

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Name: Barry Parks
From: Britain
E-mail: Contact

Cambrian SR 25-ton brake van article: further to the box-out referring to alterations, the underframe mould is now in the process of having surgery. Namely:
the solebar and headstock "depth" will be corrected;
the w-iron height will be reduced and axlehole repositioned;
the axleboxes will be moulded separately, with both SR & RCH types;
if possible, a more positive location for the floor will be provided.

The way the mould is being altered will allow shallower solebars & headstocks for the 15ton van to be made. This will be kit C95, out later this year.

Barry Parks,
Cambrian Models

Added: 23 January 2010, 19:58:47

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Name: Russ Elliott
From: London

Many thanks Mattman - you're right! I'd got my 'L' and 'a' rather confused - diagram now corrected.

Added: 8 October 2009, 18:04:43

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Name: Mattman944
From: Florida, USA
E-mail: Contact

The picture referenced for the equations for "Overhanging load on beam constrained by two simple supports" appears to be incorrect. If a = 0, the deflection will be zero which can't be correct. I believe "L" should be the distance between the supports and "a" should be the overhang.

Added: 8 October 2009, 03:06:50

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Name: Ted
From: Clag
E-mail: Contact

Re:tram drives

Andrew, the axle-hung drive on the front page of The Site was developed with this problem in mind, but for 4mm scale. There are a lot of ifs, buts and maybes, which this comment page is not really suitable for. Please email the 'contact us' link, and I'll happily get back to you with lots more detail.

Added: 1 June 2009, 14:13:15

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Name: Russ Elliott
From: London
E-mail: Contact

Andrew - if you look at, for example, the Pendlenton drive bogies page, there are examples there where outer or inner axles of drive bogies are driven. If driving on outer axles, the cardan will have to pass through the yaw axis (the pivot point) of the bogie, which will therefore require some extra ingenuity. Minimum deflections of the cardan axis will take place if the UJ pivot point is coincident with the bogie pivot axis. Such a UJ pivot axis will also be very close to where optimum bogie pitch and roll axes should be. For these reasons, driving on the outer axle via a cardan can provoke too many compromises on other suspension aspects - it really depends on how much longitudinal space one has and what kind of angular deflections of the cardan pieces you can tolerate. For 1:48 scale tram applications, axle-hung motors are likely to be a more attractive starting proposition, but since the driven axles are not mechanically linked (as they are with a central cardan arrangement), you will need to consider how best to connect (series or parallel) the motors electrically, and consider what effect a predominantly pulsed or predominantly non-pulsed electrical supply will have on the characteristics of those independent axle-hung motors.

Added: 22 May 2009, 15:39:47

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Name: Russ Elliott
From: London
E-mail: Contact

Rob - I've added Ted's description of the way the buffers are sprung to the 'Kadees for Mk1 Coaches' page.

Added: 22 May 2009, 15:10:17

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Name: Ted
From: Clag
E-mail: Contact

SPRUNG BUFFERS ON Mk1s

Rob, the heads of the original buffers were cut off, and drilled to take 1mm styrene rod. Pushed right through and left overnight to dry, then finished on the face after. This rod was then sleeved to just inside the housing with plated brass tube, 1mm bore x 1.5mm od. This plating is not readily available now, but Finney and Smith do a tube of the same dimensions in stainless steel. Or you may be able to find the same in nickel silver.

The existing housings were drilled 1.5mm sliding fit, and then capped behind the buffer beam with scrap styrene. Once dry (next day), a hole was started with a 1.5mm bit to centre the hole, then drilled through 1.0mm so as to retain the spring, a spare from Kaydee. These give a soft return.

The anti-rotation guides were made up from scrap styrene, using a broach to make an adjustable interference fit between the rod and the anti-rotation peg.

Added: 21 May 2009, 18:01:20

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Name: Andrew B. Middleton
From: Australia
E-mail: Contact

The articles that have really caught my eye are those about the use of axle-hung & underfloor drive units using those micromotors!! I have (up to 1994) modelled trams in 1:48 scale, and am now doing some heavy "armchair modelling" regarding those drive units. Where one axle is driven on each bogie, I was told to power the outer axles, and have the drive shaft pivot under/over the bogie pivot point for best results. Any comments?

Added: 9 May 2009, 10:23:35

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Name: Robert Bishop
E-mail: Contact

Hello,

On the page labled 'Kadees for Mk1 Coaches', could you please explain how the sprung oval buffers were constructed and what parts were used? I also intend to use Kadee buckeyes between coaches, but I want a dropped buckeye with hook and sprung buffers for coupling to locos.

Thanks,

Rob Bishop

Added: 7 May 2009, 11:42:46

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