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by billbedford
Sat Mar 21, 2020 4:19 pm
Forum: Chassis and Suspensions
Topic: Rigid Chassis Locos?
Replies: 62
Views: 2018

Re: Rigid Chassis Locos?

Markits have made P4 axles, whether they still stock them I'm not sure.
by billbedford
Sat Mar 21, 2020 10:42 am
Forum: Chassis and Suspensions
Topic: Rigid Chassis Locos?
Replies: 62
Views: 2018

Re: Rigid Chassis Locos?

Even with steam era track, ballast is not really very springy
by billbedford
Sat Mar 21, 2020 9:22 am
Forum: Chassis and Suspensions
Topic: Rigid Chassis Locos?
Replies: 62
Views: 2018

Re: Rigid Chassis Locos?

The late Roy Jackson wasn't a believer in 'flexible' chassis either and his locos ran on 'Retford' faultlessly. I remember him saying that he did try compensation at least once, possibly more, but he wasn't convinced by it. But then both Roy and Tony model in EM and OO which could make a difference...
by billbedford
Wed Mar 11, 2020 11:27 pm
Forum: Starting in P4
Topic: Ratio Midland Carriage bogies
Replies: 51
Views: 2985

Re: Ratio Midland Carriage bogies

According to the VCT all the surviving MR clerestory bogie coaches have Bain 8' bogies.
by billbedford
Sun Mar 08, 2020 9:41 pm
Forum: Starting in P4
Topic: Ratio Midland Carriage bogies
Replies: 51
Views: 2985

Re: Ratio Midland Carriage bogies

If I've read the drawing I have correctly, the original Midland bogies were not exactly robust. The drawing shows a channel solebar instead of the angle on the original builds. The is a photo of a carriage fitted with these bogies on page 273 of Lacey and Dow. It's interesting because all the underf...
by billbedford
Fri Mar 06, 2020 5:30 pm
Forum: Starting in P4
Topic: Ratio Midland Carriage bogies
Replies: 51
Views: 2985

Re: Ratio Midland Carriage bogies

They are new, and not yet on the web site. This one is a 9' LMS, others are in various stages of development. The plan is to have the as plug & play fitting to RTR, though the is also a bolster to be fitted on kit coach floors. They are designed for both pin pins and ballrace bearings which wil...
by billbedford
Fri Mar 06, 2020 10:54 am
Forum: Starting in P4
Topic: Ratio Midland Carriage bogies
Replies: 51
Views: 2985

Re: Ratio Midland Carriage bogies

They are new, and not yet on the web site. This one is a 9' LMS, others are in various stages of development. The plan is to have the as plug & play fitting to RTR, though the is also a bolster to be fitted on kit coach floors. They are designed for both pin pins and ballrace bearings which will...
by billbedford
Fri Mar 06, 2020 10:36 am
Forum: Coaches and NPCS
Topic: end steps
Replies: 11
Views: 1279

Re: end steps

Thanks guys. I'm pretty confident that I would never be able to cut enough individual steps consistently by hand before deciding to take up a different hobby. So I think it will be a case of drawing them up and waiting until I can put enough (different) items on one sheet to make it worthwhile havi...
by billbedford
Fri Mar 06, 2020 10:25 am
Forum: Starting in P4
Topic: Ratio Midland Carriage bogies
Replies: 51
Views: 2985

Re: Ratio Midland Carriage bogies

Of course, there are alternatives:


IMG_1451.jpg
by billbedford
Fri Feb 28, 2020 12:33 pm
Forum: Starting in P4
Topic: Ratio Midland Carriage bogies
Replies: 51
Views: 2985

bogie coaches

The brake pull rod to the bogies had to be on the centre line of the coach (think about it). So the inn v-hanger was placed on a longitudinal stringer on the opposite side of the coach to the v-hanger on the solebar. This arrangement was universal for vacuumed braked coaches. See the plan of a six-...
by billbedford
Fri Feb 28, 2020 9:08 am
Forum: Starting in P4
Topic: Ratio Midland Carriage bogies
Replies: 51
Views: 2985

Re: Ratio Midland Carriage bogies

Secondly I have some prototype questions that have not been answered by reading the Lacy/Dow Midland Railway Carriages book Vol 1. Does anyone have a drawing of the brake arrangements for these, at least as far as brake hangers are concerned as the kit has a V moulded onto the trusses/middle footbo...
by billbedford
Sat Feb 15, 2020 11:34 am
Forum: Coaches and NPCS
Topic: LNER Thompson 5 compartment brake third
Replies: 11
Views: 967

Re: LNER Thompson 5 compartment brake third

Thompson non-corridor stock were 52ft4in over headstocks and had 36' bogie centres so a Gresley 51ft underframe will need a lot of fettling to get it to work. I suggest the easiest way of making a d.361 is to remove the sides from any Hornby Thompson non-corridor and use the BCK0186S sides as sugges...
by billbedford
Wed Feb 05, 2020 12:47 pm
Forum: Guest Book
Topic: 3D printing track
Replies: 10
Views: 1001

Re: 3D printing track

Document printing has evolved ... but it took its own sweet time about it. My research group got its first laser printer in 1987, at great cost. 32 years later, I finally managed to buy a home printer that's both affordable and works well, all my previous home printers having been expensive, or ski...
by billbedford
Wed Feb 05, 2020 12:44 am
Forum: Starting in P4
Topic: Another newcomer's question re wagon suspension
Replies: 54
Views: 2671

Re: Another newcomer's question re wagon suspension

And the elephant in the room is: A 26mm axle can't be fitted into blind holes in a 24mm wide shallow channel without distorting the legs of the channel*. Note that in all other applications of pinpoint bearings at least one of the bearings is adjustable, usually on a screw thread. * the limit for th...
by billbedford
Tue Feb 04, 2020 11:26 am
Forum: Starting in P4
Topic: Another newcomer's question re wagon suspension
Replies: 54
Views: 2671

Re: Another newcomer's question re wagon suspension

Yes, this part of the design should certainly become an explicit part of the P4 standard ... but do we know what tolerances to put on the parts? What's the acceptable range for end-float in a pin-point bearing? Yes maybe, but it's a bit of an indeterminate quantity as it depends on a/ the w-iron be...
by billbedford
Fri Jan 31, 2020 9:36 am
Forum: Starting in P4
Topic: Another newcomer's question re wagon suspension
Replies: 54
Views: 2671

Re: Another newcomer's question re wagon suspension

The back to back on the society W Irons is 21.81mm, not the 24mm Tim recommends??? I would check that your verniers are correctly zeroed. there is no wear on etching tools so there can't be 'rogue' etches. I dont posess a degree in what ever. Surely if the spec for axles is 26mm axle length then th...
by billbedford
Sat Jan 18, 2020 9:34 am
Forum: Coaches and NPCS
Topic: Bill Bedford Coach Bogies
Replies: 17
Views: 1021

Re: Bill Bedford Coach Bogies

This can clearly be seen in the top picture on page 4 of the article. On my etch all four brake units are the same length and as a result the inside ones, when correctly positioned, are well short of the wheel. And thirdly the corner tabs on the Mk.1 kt appear to have holes for the spring wire whil...
by billbedford
Sun Jan 12, 2020 12:11 pm
Forum: Coaches and NPCS
Topic: G.N.R. 32ft Luggage Brake
Replies: 7
Views: 1056

Re: G.N.R. 32ft Luggage Brake

I could sell you a more expensive kit so that the price of the transfers looks more reasonable :?
by billbedford
Tue Nov 12, 2019 1:56 pm
Forum: Coaches and NPCS
Topic: Thompson BZ 6 wheel van
Replies: 19
Views: 3091

Re: Thompson BZ 6 wheel van

There was some discussion relating to 6 wheel clayton coaches on my thread a while back. This post by Mark Tatlow might be relevant ? https://www.scalefour.org/forum/viewtopic.php?p=61333#p61333 Yes, but going round by China to get to Clapham. If you have a GW wheel press, and if you build locos an...
by billbedford
Sun Nov 03, 2019 7:40 pm
Forum: Guest Book
Topic: RE: Chassis Speed Building
Replies: 20
Views: 3492

Re: RE: Chassis Speed Building

Even the GER inset the rear frames so that the pony truck would stay on the track.
by billbedford
Tue Oct 29, 2019 9:15 am
Forum: Vehicle dynamics and trackholding
Topic: Better Running
Replies: 16
Views: 1685

Re: Better Running

Philip Hall wrote:Tim, essentially it involves using a lathe to (where necessary) skim the wheel centres and gluing the tyre back on with epoxy.

Philip


If you are skimming the centres, how do to ensure the rims are going on concentrically?
by billbedford
Mon Oct 28, 2019 10:20 am
Forum: Steam Locomotives
Topic: GWR 44xx Kits
Replies: 20
Views: 1993

Re: GWR 44xx Kits

Was it the artwork? Even if the original drawn artwork (or CAD files) goes missing, the etch tooling probably still exists at the etchers so the kit could be produced. I doubt that David Geen needed direct access to both, juts the authorisation to order the etches, unless that was done by Pete Wate...
by billbedford
Sun Oct 27, 2019 8:21 am
Forum: Vehicle dynamics and trackholding
Topic: Better Running
Replies: 16
Views: 1685

Better Running

I keep getting told that some stock will run 'better' than others, and I have to admit that I have been sceptical. Then I found this: image.png Which begs the question; 'Just what can I measure to prove that the way the stock runs has been improved?' Let's keep it simple and say that I am working on...
by billbedford
Thu Oct 24, 2019 8:03 am
Forum: Wagons
Topic: Wagon W-iron types
Replies: 5
Views: 970

Re: Wagon W-iron types

From memory the obvious difference is actually on the solebar. 1907 had a semi circular plate. 1923 had 3 bolts. These differences were in the nature of the solebars. Wagons with the semi-circular crown plate had plain wooden solebars, while those with just bolts had a steel flitch(strengthening) p...
by billbedford
Fri Oct 04, 2019 4:10 pm
Forum: Steam Locomotives
Topic: H Class Wheels
Replies: 9
Views: 1651

Re: H Class Wheels

They could be, if I could work out what the geometry should be.

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