Search found 623 matches

by billbedford
Sun Jun 03, 2018 8:22 am
Forum: Starting in P4
Topic: Making a Start - The Peak District Midland / Monsal Dale pre 1903
Replies: 1141
Views: 185229

Re: Making a Start - The Peak District Midland / Monsal Dale pre 1903

How do you open out the axel boxes when using BB sprung W irons to allow the waisted bearings to move up and down freely. Assuming the axleboxes are firmly fixed to the w-irons. Use a 1.8 ball cutter in a dremel/micro-motor. Before starting the motor, place the cutter into the slot in the w-iron wi...
by billbedford
Sat Jun 02, 2018 10:33 am
Forum: East Midlands Area Group
Topic: NAG Meeting 24th May 2018
Replies: 21
Views: 4756

Re: NAG Meeting 24th May 2018

You could also use a hot air paint stripper to unsolder, and solder for that matter.
by billbedford
Sat Jun 02, 2018 10:05 am
Forum: Product Information
Topic: Ultrascale Updates
Replies: 55
Views: 11214

Re: Ultrascale now closed to new orders

Someone mentioned 3d printing of wheels earlier. I assumed that this was for the centres and not the tyres. I was vaguely wondering if you could 3d print a master from which a mould could be made? Of course it depends on whether the main expense lies in the production of the master or the mould ......
by billbedford
Tue May 22, 2018 8:45 am
Forum: Hardwicke
Topic: 14XX
Replies: 23
Views: 4590

Re: 14XX

Check that bearings on the non-driven axle are aligned properly. Otherwise something is fouling that axle and/or the wheels.
by billbedford
Sun Apr 08, 2018 10:01 am
Forum: Newport and Gwent (NAGNAG)
Topic: NAGNAG Open Day Sunday 29th July 2018
Replies: 30
Views: 14035

Re: NAGNAG Open Day Sunday 4th March 2018

Terry Bendall wrote:
newport_rod wrote:The Newport MRS / NAGNAG Open Day has been re-aranged for Sunday 29th July


Well at least you should not get cancelled by snow. :) I hope it goes well.


Anyone checked the tide tables?
by billbedford
Wed Apr 04, 2018 8:44 am
Forum: Craig Warton
Topic: wagon building progress.
Replies: 111
Views: 35527

Re: wagon building progress.

Philip Hall wrote:Craig,

An important part of keeping such a long vehicle on the deck is the weight, so I always bring a brake van up to about 70 grams or so.


So you increase the weight so that the plastic distorts and equalises the weight on each wheel and so keeps the wheels on the track?
by billbedford
Mon Mar 26, 2018 10:37 am
Forum: Layouts and Operations
Topic: Construction of a Test Track
Replies: 611
Views: 108854

Re: Track Construction for a Test Track

Allan Goodwillie wrote:Colin, super magnets

look like these, come in several sizes, really powerful difficult to separate!

DSC02905.JPG


Owww magnetic buffers?
by billbedford
Thu Mar 01, 2018 10:22 am
Forum: Tools and Techniques
Topic: Rolling brass roofs
Replies: 8
Views: 2165

Re: Rolling brass roofs

The roof need to be cut from the sheet after it has been rolled. The reason for this is that it is impossible to get purchase from rollers on outer edge of the brass, so the outermost edge will always be a straight tangent to the curve the roller produces. This is not so much of a problem when makin...
by billbedford
Mon Feb 26, 2018 9:10 am
Forum: Wagons
Topic: Dave Bradwell Springing units
Replies: 18
Views: 6367

Re: Dave Bradwell Springing units

50gm per wagon is a figure plucked from the air via some very dubious north American logic. The NMRA Recommended Practice for car weight is actually 1oz (28gms) plus 1/2oz (14gms) per inch of car length (for HO gauge), so somewhere between 50 to 70 gms would be derived values, without adjustment fo...
by billbedford
Thu Jan 25, 2018 11:04 am
Forum: Layouts and Operations
Topic: Brimsdown-The last grand project.
Replies: 381
Views: 65071

Re: Brimsdown-The last grand project.

Paul Townsend wrote:I remain a fan of soldered Brook-Smith track.
Can you please show us a dimensioned sketch of your slide chairs, they look better than anything I have done?


You can buy them from Eileen's - Point and Slide Chairs
by billbedford
Mon Jan 22, 2018 6:40 pm
Forum: Guest Book
Topic: Flexi Chassis an Appreciation
Replies: 467
Views: 77194

Re: Flexi Chassis an Appreciation

For an analogy, in the real world we have unicycles, bicycles, tricycles and quadricycles. Each added support wheel gives an extra dimension in which the cycle is stable, and need not be actively balanced. For the legendary "Little old lady of Pasadena", 4 wheels require the least skill i...
by billbedford
Mon Jan 22, 2018 12:38 pm
Forum: Track and Turnouts
Topic: 3D Printed Turnouts - Promising Progress
Replies: 25
Views: 6171

Re: 3D Printed Turnouts - Promising Progress

Le Corbusier wrote:How good, how strong and how expensive is metal 3d printing? Might the capping be printed as well as a component?


It would a lot cheaper to have a batch of capping drawn from wire, or even milled than 3D printed.
by billbedford
Mon Jan 22, 2018 11:24 am
Forum: Track and Turnouts
Topic: 3D Printed Turnouts - Promising Progress
Replies: 25
Views: 6171

Re: 3D Printed Turnouts - Promising Progress

jim s-w wrote:Can you mix materials in 1 3d print? Why can’t you print resin and metal?


Don't think so. Metals are usually sintered from powder which puts the working temperature above the melting point of most plastics.
by billbedford
Sun Jan 21, 2018 10:23 am
Forum: Coaches and NPCS
Topic: NER Coaches and NPCS
Replies: 47
Views: 16002

Re: NER Coaches and NPCS

Couple of points here.... I doubt very much that this coach would have had a 'teak' livery. It would be either NER lake until sometime in the 20s and then LNER coach brown afterward. The brakes would have been either Westinghouse before c1930 or vacuum after that date. It would be very unlikely to h...
by billbedford
Wed Jan 17, 2018 10:46 am
Forum: Starting in P4
Topic: Making a Start - The Peak District Midland / Monsal Dale pre 1903
Replies: 1141
Views: 185229

Re: Making a Start - The Peak District Midland / Monsal Dale pre 1903

There is a drawing of a Bain bogie on page 228 of Lacey and Dow (vol2). This includes a section that shows the brake rigging arrangement. The rigging for a six wheeler would be similar but attached to the frame members. Note there were no brakes on the centre axle. Luckily all this stuff will be hid...
by billbedford
Fri Jan 12, 2018 9:21 pm
Forum: Guest Book
Topic: Flexi Chassis an Appreciation
Replies: 467
Views: 77194

Re: Flexi Chassis an Appreciation

Oh dear, more road vehicle stuff. No wonder you are confused. The problem with this stuff is that railways, in general, keep any bumps in the track to a minimum. So we can ignore ignore most of what he said, apart from one thing that he implied, but didn't say explicitly. This was that if the wheels...
by billbedford
Thu Jan 11, 2018 9:38 am
Forum: Guest Book
Topic: Flexi Chassis an Appreciation
Replies: 467
Views: 77194

Re: Flexi Chassis an Appreciation

See my immediately previous answer to Bill. Whether for an individual wheel, or the whole loco, the spring rate you end up with is the one that statically balances the weight for the support spacing, not necessarily the one that could/should have been chosen to give the best dynamic smoothing of bu...
by billbedford
Thu Dec 21, 2017 10:21 am
Forum: Guest Book
Topic: Engineering, Injuneering and Knitting
Replies: 49
Views: 7890

Re: Engineering, Injuneering and Knitting

Just to state the obvious: new High Speed lines have been mostly laid on ballast. Except in more challenging areas, tunnels being the obvious example as in your link. I think I read of a hybrid system of concrete track on ballast on some new ICE track in Germany. No model track it 'laid in ballast'...
by billbedford
Thu Dec 21, 2017 10:12 am
Forum: Guest Book
Topic: Engineering, Injuneering and Knitting
Replies: 49
Views: 7890

Re: Engineering, Injuneering and Knitting

[Oh dear. I have had the impression from the Forum and this Society for some time that it is fashionable to sneer at Rice and Sharman. I wouldn't be in this hobby were it not for their writings. Which doesn't mean that I think everything Iain says is true, nor that all railway truth is contained in...
by billbedford
Wed Dec 20, 2017 12:27 pm
Forum: Guest Book
Topic: Flexi Chassis an Appreciation
Replies: 467
Views: 77194

Re: Flexi Chassis an Appreciation

Actually I was trying to get Bill to understand the basics of there being an independently controllable dynamic spring deflecting rate by picking the spring length and dia. in co-ordination, as opposed to just achieving static balance with the spring length that happens to fit easily in the chassis...
by billbedford
Wed Dec 20, 2017 11:13 am
Forum: Guest Book
Topic: Engineering, Injuneering and Knitting
Replies: 49
Views: 7890

Re: Engineering, Injuneering and Knitting

It is obvious the the Crossrail engineers haven't read any of Iain Rice or Mike Sharman's excellent advice since 80% of the track in the new Elizabeth Line tunnels is mounted on solid cast concrete bases.

http://www.crossrail.co.uk/construction/railway-systems/
by billbedford
Mon Dec 18, 2017 8:05 pm
Forum: Guest Book
Topic: Flexi Chassis an Appreciation
Replies: 467
Views: 77194

Re: Flexi Chassis an Appreciation

However, what doesn't seem to be mentioned much on the forum is that merely fitting springs to wheel bearings does not itself provide a springing motion unless the spring rate is low compared to the weight of the vehicle supported by that wheel. . For those using horizontal wires, what seems to be ...
by billbedford
Mon Dec 18, 2017 7:59 pm
Forum: Guest Book
Topic: Engineering, Injuneering and Knitting
Replies: 49
Views: 7890

Re: Engineering, Injuneering and Knitting

https://m.youtube.com/watch?v=Q3JINX9Gnv0 The rail seems somewhat loose here? ...and the sleepers would appear to have split. Are you saying that the movement is actually the rail with sleeper attached floating up and down on the ballast .... I am not sure I buy that as the pictures from my period ...
by billbedford
Mon Dec 18, 2017 5:36 pm
Forum: Guest Book
Topic: Engineering, Injuneering and Knitting
Replies: 49
Views: 7890

Re: Engineering, Injuneering and Knitting

a thing I have always been curious about chez Rice is to do with suspension. Iain suggests (I think in his track work book but could be the chassis one) that on the real thing the track itself sinks in to the ballast as the train rolls over providing a degree of 'suspension'. This as I recall went ...
by billbedford
Mon Dec 18, 2017 5:21 pm
Forum: Guest Book
Topic: Flexi Chassis an Appreciation
Replies: 467
Views: 77194

Re: Flexi Chassis an Appreciation

Will L wrote:3. The CSB spread sheets came about because of the need to work out where the fixed fulcrum points must go.


We need a spreadsheet because the deflections on a beam with more that two supports is mathematically indeterminate. ie there aren't enough equations to be able to solve the problem.

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