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Member postings for John Baguley

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

Thread: injector problems still
14/02/2017 07:20:12

Hi Ron,

Sorry to hear that you are still having problems.

Can you borrow an injector that is known to work reliably e.g. that is taken off someone else's loco? Swap that for one of yours and see if it makes any difference. If the other injector works then it's your injectors that are the problem. If the other injector doesn't work either then there is something wrong with your pipework etc.

Your problem suggests two possible causes to me (assuming that the injectors are not at fault). Either the steam supply to the injector is restricted somehow or your clack valves may not have enough lift on the balls.

Are you using commercial valves for the steam valves? Sometimes the passages through these valves are too small, especially on the globe type valves.

Injectors often need more lift on the balls in the clack valves than those used for hand pumps and axle pumps.

What size injectors are you using? If you are using say 24oz then try an 18oz. The smaller injector will need less steam and water so may work if the supplies are not enough for a 24oz. If the 18oz does work then you need to look at the steam and water supllies.

Have you got filters in the tender for the injector supply? If not, you could be getting muck in the water supply which will stop the injectors working after a time.

Be careful not to go overboard with pickling the injectors. The acids will eventually damage the brass cones and affect performance.


Edited By John Baguley on 14/02/2017 07:21:05

Thread: Quality digital vernier calipers
12/02/2017 16:50:13

Keep a look out on Ebay for s/h Mitutoyo. etc. You can get some real bargains for a lot less than the full price.

After using the cheap Aldi ones for years (and I've been perfectly happy with them apart from the very short battery life) I've recently bought several s/h Mitutoyo calipers and micrometers quite cheaply. Some are in almost new condition but some have the odd scratch or two. Also bought a few 'faulty' ones that just needed cleaning and now work perfectly. I couldn't believe that the batteries are supposed to last for over 2 years!

As mentioned, watch out for the cheap chinese copies. You are not going to get a genuine brand new Mitutoyo for £10!


Thread: accurate measurement of steam temperature
07/02/2017 13:03:44
Posted by SillyOldDuffer on 07/02/2017 12:36:29

I wonder if anyone has ever comprehensively fitted a model loco with thermocouples? Comparing steam temperature in the boiler, super-heater, cylinder inputs, and cylinder outputs might suggest improvements.


Yes, the late Jim Ewins did it on his O-6-2T loco and measured the temperatures at many points in the boiler, flues, etc. under various load conditions. His results were written up in ME for 18th March, 1st April, and 20th May 1966.

It is interesting to note that the maximum superheat temperature measured was 378°F (192°C) giving a final steam temperature of 620°F (327°C). The maximum superheater temperature recorded was 1570°F (854°C!)


Thread: denham junior mk2
19/01/2017 01:42:21

Hello Peter,

I didn't put these pics on my website but here are a couple of the reversing gears in the gearbox - right hand side of photo:

gearbox 1.jpg

gearbox 2.jpg

This is part of the gear assembly that does the reversing - bottom right of the photo

gearbox 3.jpg

I've got a CAD drawing of the gear assembly and bronze bush that I did for someone some time ago. Funny enough, they were missing the reverse gears as well. It's not the same lathe is it by any chance?


Edited By John Baguley on 19/01/2017 01:43:13

Edited By John Baguley on 19/01/2017 01:45:00

Edited By John Baguley on 19/01/2017 01:46:40

18/01/2017 23:35:33


Check your pm box.


Thread: Stirling Single
20/12/2016 17:51:51

Hello Tony,

the Greenly drawing gives the tread diameter of the driving wheels as 4.0625". The bogie wheels are 1.96875" diameter and the trailing wheels are 2.21875. The tender wheels are the same as the bogie wheels.


20/12/2016 15:55:27

Hello Tony,

Henry Greenly did a design for the GNR 8' Single in 2.5" gauge which would probably date back to the thirties. We do have a copy of the drawing for it (L78) but it is only a single sheet general arrangemant drawing, as were a lot of HG's drawings.

If the number is original, I doubt that it would be a commercial design but it is possible that the number was added later.

The loco is well worth restoring and fortunately it seems pretty well complete apart from the safety valve cover.. Judging by the condition of the grate it has done a fair bit of running in the past.

Note that it will probably be to the older 1/2" to the foot scale rather than the more modern 17/32" to the foot.


Edited By John Baguley on 20/12/2016 15:56:16

Thread: 1/4 " Thinwalled Stainless Steel Tubing
03/11/2016 13:22:49

I get mine from Southern Temperature Sensors:

They do much thinner wall tubing (316L) than the ME suppliers in both metric and imperial sizes. They also advertise on Ebay but usually only in short lengths.

Usual disclaimer.


Thread: Salvage Hauls
24/10/2016 20:55:29


I'm sure that the bearings on the ch pumps are water lubricated which is why they are not sealed from the liquid. I doubt if they will last long being run dry. As Jason suggests, they can be used for pond pumps but are not self priming. I've never found them to last very long in that application though.


Thread: Tools I would like to have
24/10/2016 20:43:45

Check out Adam Booth (abom79) on Youtube. He uses 'metallisation' all the time for building up worn shafts. The equipment he uses looks like an oxy acetylene torch which is fed with metal powder that melts in the flame and is sprayed onto the worn metal. Looks quite simple to do and very effective.


Thread: Water pump problem
22/10/2016 16:44:47

The inlet ball valve of the pump may be leaking under pressure and allowing some of the water to go back into the tanks instead of into the boiler. It's also possible that the pump is simply not big enough to maintain the water level.


Thread: Little LEC 2016 Video
15/08/2016 20:14:30

Nice turnout from the 2½" gauge lads as well smiley Thanks for the video Stew.


Thread: Bassett-Lowke 2 1/2 inch flying scotsman
20/07/2016 01:13:04

Hi Derek,

Have sent you a pm regarding drawings.

So far as I am aware, the BL Scotsman was designed by E W Twining and had nothing to do with Henry Greenly.

HG did produce some excellent coal fired 2½" gauge designs for Bonds of Euston road which are quite capable of pulling a person or two. It was just Bassett Lowke that seemed to not want to progress beyond simple spirit fired boilers.


Thread: PTFE piston rings
19/06/2016 02:22:36

I've used them on several 2½" gauge locos with excellent results. Also used PTFE on piston valve heads with equally good results. With these smaller bores though I haven't used backing O rings and just relied on the plain PTFE rings on their own. I fit two thin rings side by side with the gaps 180° apart to prevent leakage. It is essential to allow clearance for expansion when the rings get hot.

I haven't done it yet but I've thought of using graphite filled PTFE for the rings as this material is harder and springier than virgin PTFE and may not need the backing O rings in the larger sizes.


Thread: 2 1/2" Gauge Dyak
07/06/2016 01:03:54


the drawings show the safety valve bushes as threaded 3/8" x 26.


Thread: Brittania superheater
08/05/2016 19:25:22

Hi Bri,

I would think that the 4mm bore to feed the regulator is far too small for a 5" loco. I use larger than that for a 2½" gauge!

Is your problem with silver soldering the leak on the foundation ring simply due to a lack of heat? You're going to need a hell of a lot of heat to get it hot enough. Are you using a propane torch or do you have oxy acetylene or similar?


Edited By John Baguley on 08/05/2016 19:26:39

Thread: Boiler Paint nightmare
27/04/2016 11:01:36

HI fizzy,

Have you tried Halfords high temperature enamel? I used it on my Helen Long smokebox and it's still good after 8 years. They do matt, satin, and gloss versions.


Thread: denham junior mk2
25/02/2016 13:45:20

Hello Peter,

Yes, it's got 8 divisions. You might be able to get a suitable gear ready made or perhaps adapt a complete unit from a lathe with the same size leadscrew (4tpi) if there is one.

Will send you a pm with regard to the manual.


25/02/2016 12:12:28

Hello Peter,

This is the dial fitted to mine:

screw cutting dial 1.jpg

I don't think it's an original part though as it looks homemade. I've had a look at the manual and there is no mention of a screw cutting dial so possibly the lathes didn't have one when originally built. I would expect one fitted at the factory would have had a cast body.

It looks pretty easy to make one. Couple of bits of bar soldered or welded together, with a spindle, dial, and gear wheel.


Just had another look at the manual and there should be a leadscrew guard that bolts onto the end of the apron where mine has the dial. That was obviously taken off and lost when the dial was fitted.

Edited By John Baguley on 25/02/2016 12:14:42

Edited By John Baguley on 25/02/2016 12:23:41

Thread: Wet Belt
16/02/2016 16:04:39

My Triumph T160 with Norman Hyde 1000cc kit has a Norman Hyde toothed belt conversion to replace the old Triplex? primary chain. Hasn't been on the road for a few years now (must get it rebuilt!) but never gave any trouble when it was running. The belt's not rubber though. Can't remember what material it is offhand but some type of plastic (polyurethane?) I think.


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