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Member postings for David Taylor

Here is a list of all the postings David Taylor has made in our forums. Click on a thread name to jump to the thread.

Thread: Inclined smoke tubes
02/01/2018 23:32:45

It will be interesting to see what happens with my boiler - when we soldered the tubes into the firebox they had a big 'upward' slope on them and when I fitted them to the smokebox tubeplate yesterday I had to bend them down something like 3/4"! So they have a very noticable bend in them back towards the firebox.

I assume the draft will still pull the hot gas through. But I'd rather the tubes had stayed straight. Too late to do anything about it now so I have to hope for the best.

Thread: 3 1/2 inch small boilered TICH
02/01/2018 23:07:04

You're doing a great job!

Using a ratcheting/one-way bearing would make building the lubricator a lot easier than the old gear ratchet mechanism.


Thread: Centre Finder Query
02/01/2018 22:40:56

I'm glad someone asked that, I have one and had no idea what to do with that part! dont know

I usually do what Paul said, just line up the centre pop with a drill point or pointed rod.


Thread: The Workshop Progress Thread (2017)
07/11/2017 07:27:30

I'm plugging away on a 5" gauge NSW 24 class mogul. I got it running on air earlier this year so have been working on the boiler. I decided to get the smokebox to the point it can be used to help level the boiler barrel.

A friend tack welded the wrapper on for me.

Regards, David.




Thread: Right hand threads
31/10/2017 03:47:18
Posted by Mick B1 on 29/10/2017 22:29:04:

They were following the sun, which appears to rotate clockwise through the sky. Hence anticlockwise or left hand threads are 'widdershins' - against the sun.

That threw me for a second... I'm in the southern hemisphere!

Thread: Are you offended when the media poke fun at your hobby?
27/10/2017 00:22:05

This seems to be mostly a British preoccupation. Yanks are proud of their hobbies. Us skips don't worry about it. I don't see much media coverage of my hobbies but in the local paper it's always positive. The parents who bring their families to our monthly running days are nothing but positive and always give admiring comments about the locos.

I'm not going to get offended by what some latte slurper or progressive twat thinks until I've seen what they've produced.

Thread: How to cover a wooden bench top with a steel sheet
31/08/2017 10:50:40

I used masonite as a sacrificial top on mine, just screwed on. Seems to work well and was pretty cheap.

Thread: Flared Tender Sides
31/08/2017 10:24:17

When I made my 6 wheel tender with flared top I used a steel bar with the desired radius welded to a flat plate of steel as the former. To do this you'd sit the bar and the plate on a flat surface and weld them such that the plate was sort of tangential to the bar.

The brass was sat upon this, situated so the start of the bend was where the bar joined the plate.

Another flat sheet laid on top of the brass, and everything clamp together. A bit like Julian's solution.

I did anneal the brass. I think I did that when it was already clamped between the two sheets of steel.

Then just tap the brass over the former. Luckily it worked well - I would have been upset after drilling all the rivet holes if I messed up!

The join at the rear corners was tricky, I just kept filing until I had a reasonable fit. I did mess up the rear plate of the tender and had to make another.

Sorry I don't have a photo of it, I borrowed the steel bits off a club member.

13/05/2017 02:07:31
Posted by john carruthers on 11/05/2017 08:32:38:

How does one break the vacuum in the bottles while filling the glass ?

That was my immediate question too. I'm not an engineer and even I could wonder at that.

Thread: Machinery's handbook
26/03/2017 23:21:10

The steampunk crowd would love it, I'm guessing that was the motivation.

Thread: Making single-point Threading easier on a Mini-Lathe
26/03/2017 23:14:25

Great project!

Given you're controlling the carriage movement you could do multiple start threads by cutting one thread completely and then making an adjustment to the carriage start position to cut the next part of the thread.

Thread: What Did You Do Today (2017)
18/03/2017 21:42:40

I made the oil pots for the tops of the slidebars of the loco I'm building. Was a nice easy job once I had a system worked out.


Thread: minature hydraulics and pneumatics
16/03/2017 21:00:53

Very interesting info on the fluidic logic, thanks!

Thread: injector problems still
05/03/2017 22:43:49
Posted by Ron Hancock on 05/03/2017 12:11:32:

Hi Dave thought i would share some shots of my friend Colin and Nancy Cambel from Melbourne Australia such nice wonderful couple with a 2 1\2 mile track in his back garden and runs every weekend.

Hi Ron,

A very impressive setup! Those are very big locos.

My father-in-law goes to a place in Qld where the bloke even makes scale bricks to make the buildings with, scale signals, etc.

05/03/2017 22:33:10
Posted by julian atkins on 05/03/2017 21:14:47:

Dave's comments are of interest because an ordinary injector will not work if the feed water temperature is over 46 degrees C. The maths and science behind this is in DAG (Derek) Brown's excellent book on miniature injectors, and concurrs with the explanation in my second edition of Pullen's book dated 1900.

If I am running on a very hot day in the UK (very rare) I leave the injector water valves open all the time. The tender or tanks need replenishing far more often, but if a mains supply it will keep the feed water temperature down to well below 46 degrees C.

I doubt our water gets that hot, but our injectors stop working anyway. None of them are lifting injectors, they're all horizontal ones below the footplate so they're also below the level of the tender tank bottom.

We do the same thing leaving the water flowing through the injector the whole time.

Apparently we have a maker of reliable, high quality injectors here in Aus, two of which I have waiting for my NSW mogul. I don't want to try them on my current loco in case they get contaminated somehow!

05/03/2017 00:38:52
Posted by Ron Hancock on 03/03/2017 12:24:52:

Hi David where down under do you come from and yes never thought about how they perform down under in the heat their. Whilst visiting my Daughter in Melbourne we went to Cambel toen railway he has a lovely set up 2 1\2 mile track round his garden 3 steam two deisel and runs every weekend giving rides. He was after some injectors for his 7 1\4 he is not on the internet so not sure how he got on.

Hi Ron,

I'm about 4 hours west of Sydney. It has been one of the hottest summers anyone can remember getting up to 40deg C. Even water in tenders gets too hot for the injectors to work reliably. We didn't use ice on the Jan running day and had lots of problems. I was putting my loco back together after a major overhaul leading up to the running day and couldn't get the injectors to work until I fired it up early in the morning before the day heated up, and put fire bricks between the frames and injector bodies. Then they worked okay. I didn't bother putting water in the side tanks of my loco because it's well known that doesn't work well with injectors. I filled them with sand for weight.

During winter it goes from about -4dec C at night to 8-12deg C during the day. Maybe not as cold as the UK, but cold enough! Quite a temperature range around here.

I read a good web page someone wrote about the process he went through making and testing his own injectors, but I don't have his persistence so I'm not sure I'd make a go of it. But he had a means of testing them off the loco which seemed a good idea to eliminate the many parts on the loco which can be at fault.

As far as I can tell they work well until one of a million things upsets them and then you have the joy of cleaning them, checking the pipes, valves, taps, filters, clacks, sacrificing chooks, and who knows what else.

03/03/2017 00:00:38

I find them frustrating too. The problem is there is so much that can be wrong - the pipe work, water valves, clack valves, cones - positioning or gunked up, water temperature, pressure range, the list just goes on. It's a wonder the damned things ever work. During the summer months down under its even worse and sometimes if you don't put ice in your tender you're out of luck. Then of course they all have different threads for the connections! I have a pair from somewhere and even the bloke in the club who made a living building and fixing locos didn't have a tap or die they'd match.

My club really frowns upon axle pumps so we all run two injectors. I get the feeling on many locos only one of them works reliably and gets used all the time with the other one only used in emergencies when the 'good' one decides to play up. Way too much of my driving time is spent watching the injector overflow and fiddling with water and steam valves trying to keep water in the boiler.

I can't say I'd blame anyone for fitting either an axle pump or an electric pump as a way of getting water in their boiler, especially with a bypass so you could have a chance at setting it to keep a decent water level most of the time.

It might be a good project to have a testing setup of some sort with a boiler, water tank, and just enough pipe work to test the rotten things.

It seems unless you can make them yourself you'll probably fall foul of them at some point.

Thread: Brass cylinder block correction question
27/02/2017 23:13:41

Martins solution looks pretty good in this case. You're replacing the whole wall between the two ports. I hope I remember the idea if I ever have the same problem. I very nearly did on my current loco - you can see where the drill went into the port wall but I was lucky enough that it didn't go through.

Thread: Arduinos and Microcontrollers ref: Rotary Table Mew 249
22/02/2017 01:11:39
Posted by Muzzer on 05/12/2016 12:58:21:

Like most of our generation, I've been messing with micros for much of my career but the upcoming generation has been born into this wave of technology, which is so much more powerful, cost effective and user friendly than what we were used to. It's fascinating to think where this is leading...

I taught myself to program back in the early 80s, have always been interested in the lowest level operation of computers, and always worked as a programmer.

And yet not one of my 4 children has shown the slightest inclination to look beyond watching youtube or playing games.

I think their saturation in computers has the opposite effect - to me as a teenager they were new and interesting and thought-provoking. To today's kids they're like a washing machine, VCR, or DVR. There is no real wonder to it.

There will always be people interested in them but I don't think we're ever going to raise a generation who consider coding a normal skill any more than we ever had a generation who could all do plumbing, or design rockets.

I kind of disagree with the user-friendly part too. Writing programs on a BBC micro or Commodore 64 was a lot easier than all the hoops you have to jump through today, whether it be installing an IDE, running a python interpreter or whatever.

There is more info about though, and its a lot easier to get it.

Thread: Phosphoric acid ok pickle for copper and brass?
21/02/2017 03:52:15


I was using phosphoric acid as a pickle for silver soldered steel parts and also to get the mill scale off laser and water jet cut parts. It works really well.

So I have been using it to clean up the inlet and exhaust plumbing for my loco during construction and it seems to clean them up well but I am wondering if anyone knows whether it will harm these metals?

I could get another plastic garbage bin and fill it with citric acid but if I can just use one thing it's easier.

Regards, David.

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