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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: Myford paint colour
08/04/2017 15:21:56

A bit like when you dash upstairs for something and forget why!

John

Thread: Table 2 Query : The Missing 98%, ME4558
08/04/2017 15:19:42

Hi Dave,

Row 5 should read 'Heat transferred in firetubes'.

Jim's original articles appeared in ME 1966, March 18th, April 1st, and the table in 20th May.

John

 

Edited By John Baguley on 08/04/2017 15:25:20

Thread: Myford paint colour
08/04/2017 13:16:21

1973 - Red

Thread: Rivet and Bolt cropping
06/04/2017 21:45:04

I drill a clearance hole through a suitable thickness piece of steel, push the bolt,screw/rivet through, hold in place with a file handle or similar, and then cut off the surplus with a fine tooth saw. A rub over the end with a fine file gets rid of any burrs. If you have a lot to do it would be better to harden the steel so it doesn't get worn down by the saw so easily.

I tend to buy the longer length bolts as they are not much more expensive than short ones and it saves keeping a large stock of different sizes.

Mike Boddy in Australia designed and had made a cutting tool very similar to the crimping pliers but specifically for bolt shortening. I've got one of his prototype sets in the workshop and they work very well. I think they cover BA and metric sizes. He was looking to find someone to import them for him to keep down the cost but I don't know what the situation is at the moment.

John

Thread: What Did You Do Today (2017)
15/03/2017 19:35:01

Hopefully there will be a shear pin somewhere in the drive train to the leadscrew. If so, that will probably have gone.

John

Thread: Local mirror silvering services ?
16/02/2017 17:15:45

Those books were my bible as well and I still have them, although I gave up astronomy many years ago now.

John

14/02/2017 07:31:32

I used to send mine off to be aluminised and overcoated. Can't remember where now but I presume such firms still exist?

I did silver a 12" mirror myself once which wasn't particularly difficult. The problem nowadays would be getting hold of the chemicals - IIRC silver nitrate, concentrated nitric acid (for cleaning the glass), ammonia, sodium hydroxide, and dextrose. I got my chemicals from the local chemist but those days have long gone unfortunately.

Silvering can be a bit nerve racking as you can get silver fulminate formed during the process if you don't mix the chemicals properly!

John

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.

John

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!

John

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.

Dave

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!)

John

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?

John

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

Paul,

Check your pm box.

John

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.

John

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.

John

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:

http://www.southerntemp.co.uk/

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.

John

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

Frances,

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.

John

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.

John

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.

John

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.

John

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.

John

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