Search found 39 matches

by davebradwell
Sat Jun 15, 2019 9:33 am
Forum: Track and Turnouts
Topic: Joggled Stockrails
Replies: 53
Views: 2890

Re: Joggled Stockrails

I'm disappointed that we've failed to convince you that the joggle is unnecessary, Julian. The work of the devil, in fact. I will, though, agree that pcb trackwork, 60s style is great fun - all my visible fiddle yard is made this way. It's just nice to do something quickly for a change, although it ...
by davebradwell
Fri Jun 14, 2019 3:28 pm
Forum: Tools and Techniques
Topic: Track cleaning
Replies: 49
Views: 1184

Re: Track cleaning

This could be it, sent to me by the East of Scotland group.

DaveB
by davebradwell
Fri Jun 14, 2019 11:48 am
Forum: Tools and Techniques
Topic: laser welding
Replies: 11
Views: 449

Re: laser welding

What a great toy!

What I'm missing is how they hold the bits together before they do the welding. Clever design, I suspect.

You could do your fingernails, too - on purpose, I mean.

DaveB
by davebradwell
Wed Jun 12, 2019 8:27 am
Forum: Guest Book
Topic: REF: Rail wheel profile and "to do" list update
Replies: 24
Views: 1458

Re: REF: Rail wheel profile and "to do" list update

I suspect if you just file an angle on the gauge face of those blade tips, Julian, in line with the other correspondence, all will be much improved. Some of my early efforts weren't wonderful but they've been poked and filed until they work. Replacement would be a last, desperate measure when 00 whe...
by davebradwell
Tue Jun 11, 2019 7:17 pm
Forum: Guest Book
Topic: REF: Rail wheel profile and "to do" list update
Replies: 24
Views: 1458

Re: REF: Rail wheel profile and "to do" list update

Oh no, we're back to this stuff again. There have been a few efforts recently in the Forum and magazine to prove that a wheel will just throw itself off the track (flange climbing if you like) and that weight is a factor. Can we just agree that such conclusions are fundamentally flawed and we get de...
by davebradwell
Sat Jun 08, 2019 7:47 pm
Forum: Track and Turnouts
Topic: Joggled Stockrails
Replies: 53
Views: 2890

Re: Joggled Stockrails

You should get some of Mike Clarke's etched chairs, Julian, if you're going this way. You'll not build a stronger point and all of Bob How's complex stuff on King's Cross is done this way. Mike does point kits for PCB sleepers.

DaveB
by davebradwell
Sat Jun 08, 2019 3:49 pm
Forum: Wagons
Topic: Waisted bearings for Bedford sprung W irons?
Replies: 23
Views: 1018

Re: Waisted bearings for Bedford sprung W irons?

Now you're winning, why not buy a few more packets of the same bearings from the same batch as you have so you can use the same axleguard spacing every time and avoid going through this performance with every wagon you build. If you wish, axleguards can be narrowed with a double bend at the base lik...
by davebradwell
Fri May 31, 2019 7:36 pm
Forum: Wagons
Topic: Accurascale PCA
Replies: 8
Views: 701

Re: Accurascale PCA

Is that a definite "maybe" then?

DaveB
by davebradwell
Fri May 31, 2019 10:34 am
Forum: Wagons
Topic: Accurascale PCA
Replies: 8
Views: 701

Re: Accurascale PCA

The hoppers use a short axle (25mm) which is a nuisance although some folk don't seem bothered by the splayed axleguards when standard wheelsets are fitted. I thought this looked very odd so did a lot of hacking to fit springs and restore squareness. Not my definition of easily convertible although ...
by davebradwell
Sun May 26, 2019 9:18 am
Forum: Track and Turnouts
Topic: Joggled Stockrails
Replies: 53
Views: 2890

Re: Joggled Stockrails

Sorry, I wasn't aware that I was being pedantic, Julian and I certainly never meant to imply you were a bore. You're quite difficult to persuade, however! I think trackwork is one of those areas where shape is much more important than the last gnats of accuracy (perhaps a bit like music) as we've de...
by davebradwell
Fri May 24, 2019 10:21 pm
Forum: John Donnelly
Topic: Wagons for South Pelaw Junction
Replies: 110
Views: 16025

Re: Wagons for South Pelaw Junction

Sorry to disappoint but castings come in sets and etches come in sheets so you can't pick which bits you want unless you can find someone to take those left over. You might be able to make your own replacement bogie sides using casting resin, however, if you feel the need. Your wheels should just cl...
by davebradwell
Fri May 24, 2019 2:55 pm
Forum: Track and Turnouts
Topic: Joggled Stockrails
Replies: 53
Views: 2890

Re: Joggled Stockrails

I have to admire your tenacity and attention to detail, Julian. Hopefully, Martin has sorted out your main question but it follows from this discussion that if a point blade end is not sitting below the stock rail then it's at risk of causing a derailment. I just couldn't do filed rebates - they rem...
by davebradwell
Tue May 21, 2019 10:19 pm
Forum: Track and Turnouts
Topic: Joggled Stockrails
Replies: 53
Views: 2890

Re: Joggled Stockrails

Surely the only reason for using joggles is to better represent your favourite railway company - they are part of the atmosphere, if you like. Now, done properly they are a very subtle feature but, like Alan Ferguson, I can see no reason for using them otherwise. I use an NER drg for non-undercut he...
by davebradwell
Tue May 14, 2019 9:20 pm
Forum: DCC
Topic: DCC Bus Wire
Replies: 10
Views: 1153

Re: DCC Bus Wire

In my working days, signal wiring was never in a loop in order to minimise pick-up of interference - or radiation of it. Volt drop was dealt with by using an appropriate gauge of wire in power circuits which also avoided loops. Now, the better DCC systems are very good at rejecting interference so i...
by davebradwell
Mon May 13, 2019 7:47 pm
Forum: Chassis and Suspensions
Topic: Chassis Speed Building - Records and Methods
Replies: 17
Views: 895

Re: Chassis Speed Building - Records and Methods

It takes a long time to build a decent chassis, mainly because of all the obscure stuff you have to check - are all the wheels the same size, for example? I can assemble one of my own kit chassis pretty quickly but by the time I've done all the checks and measurements the time just passes. Going bac...
by davebradwell
Fri May 10, 2019 9:34 am
Forum: Chassis and Suspensions
Topic: Singles and suspension
Replies: 14
Views: 593

Re: Singles and suspension

Can't see how hanging the tender on the back will help adhesion as it only increases weight on trailing axle. You'd need a strange cantilever to reach the centre. You want loco as heavy as poss so motor goes in tender with thin wire shaft across cab floor. Spring loco like full size with wire leaf s...
by davebradwell
Thu May 09, 2019 8:22 am
Forum: DCC
Topic: DCC Bus Wire
Replies: 10
Views: 1153

Re: DCC Bus Wire

If it's good practice to avoid a loop, then surely this is the thing to do, especially as it doesn't cost anything. It isn't quite the same as a ring main in a house as that wasn't designed to carry data although they sometimes do now, of course, and at a higher frequency. Whatever, why not do it co...
by davebradwell
Tue Apr 30, 2019 4:56 pm
Forum: Starting in P4
Topic: Problem Arising From My First Morgan GWR Underframe
Replies: 13
Views: 1185

Re: Problem Arising From My First Morgan GWR Underframe

Don't I even get 1 out of 10 for trying? You need to be careful with your method as you are measuring to the non-functional side of the flange. It's the back of the flange that bears against the axleguard and the critical depth dimension given by Russ Elliot in his article is correctly taken from he...
by davebradwell
Sun Apr 28, 2019 4:18 pm
Forum: Starting in P4
Topic: Problem Arising From My First Morgan GWR Underframe
Replies: 13
Views: 1185

Re: Problem Arising From My First Morgan GWR Underframe

OOps, sorry, I've found a photo elsewhere and see both are removable on one side. Apologies.

DaveB
by davebradwell
Sun Apr 28, 2019 4:10 pm
Forum: Starting in P4
Topic: Problem Arising From My First Morgan GWR Underframe
Replies: 13
Views: 1185

Re: Problem Arising From My First Morgan GWR Underframe

Why not just measure over the outside of the rigid axleguards with axle and bearings in place and work backwards from there. You don't really want to know how deep the cones are, just how wide to set the axleguards and this will get you there much more accurately. Remember waisted bearings are usual...
by davebradwell
Wed Apr 24, 2019 9:04 pm
Forum: Track and Turnouts
Topic: rail/wheel profile - prototype has problems too
Replies: 22
Views: 1631

Re: rail/wheel profile - prototype has problems too

Now my maths is rather rusty and my serious maths forgotten but if I take Will's Nadel formula L/V (lateral and vertical forces) where vertical must be twice lateral and replace lateral by mv^2/r (tension in string when whirling a rock) we find that the tendency for the flange to climb is independen...
by davebradwell
Fri Apr 12, 2019 2:15 pm
Forum: Starting in P4
Topic: P4 wagon Compensation(springing)
Replies: 31
Views: 2095

Re: P4 wagon Compensation(springing)

Gordon Bennett! As there appears to be a stone wall preventing resolution of the bearing/axleguard compatibility issues, I'll go back to my main point which was to use the plastic axleguards, slotted, in order to save a lot of work replacing them and adding castings. What's wrong with that then? DaveB
by davebradwell
Thu Apr 11, 2019 8:32 pm
Forum: Starting in P4
Topic: P4 wagon Compensation(springing)
Replies: 31
Views: 2095

Re: P4 wagon Compensation(springing)

I'm not interested in the variables - I'm telling you how to avoid them. Take charge of your supplies and put the solebars in the correct place for the components you have, then do it every time. All my axleguards are the same distance apart, it's just quicker than messing about trying to find an od...
by davebradwell
Thu Apr 11, 2019 6:08 pm
Forum: Starting in P4
Topic: P4 wagon Compensation(springing)
Replies: 31
Views: 2095

Re: P4 wagon Compensation(springing)

I bought some bearings from Markits last year and I'm due to order some more. Why should he suddenly make them a different depth? When the Exacto ones come back on the market I expect them to be to the society drg just as before. I'm sure Colin Seymour does his best to give a consistent product thes...
by davebradwell
Thu Apr 11, 2019 2:42 pm
Forum: Starting in P4
Topic: P4 wagon Compensation(springing)
Replies: 31
Views: 2095

Re: P4 wagon Compensation(springing)

Cone depth is very consistent if you stick with one supplier so don't just chuck them all in the same bag. Further, that supplier's waisted bearings are shallower than their normal ones in line with the society drawings published in Scalefour News a little while ago. Someone - probably Russ - listed...

Go to advanced search