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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: Scale gauges
22/08/2019 16:19:40

The scales and gauges were standardised way back in Henry Greenly's day. Standard gauge locos in 2½" gauge were originall built to a scale of 1/2" to the foot but this later became 17/32" to the foot to give more accurate proportions. As stated, Standard 3-1/2" gauge is a scale of 3/4" to the foot and 5" gauge is 1-1/16" to the foot. The Americans etc. mostly use 4-3/4" gauge which is 1" to the foot. 5" gauge in the USA is rare.

It's often stated that the American 7-1/2" gauge came about because of a mistake by someone as they did originally use 7-1/4".


Thread: Thread sizes on flexispeed meteor lathe
22/08/2019 16:07:12

Hi Mark,

I've just dug my 1970's vintage Flexispeed out of it's box (been in it for years now!). The gib screws seem to a weird size that I can't find in my thread charts.

The pitch seems to be either 32TPI or 0.8mm and the diameter is 0.1305" or 3.32mm. Someone more knowledgeable than I may be able to help further.

Yours may be a different vintage to mine so the threads may not be the same?

I bought mine as a kit and it came with assembly instructions and a drawing but unfortunately there is no information on the threads used.


Edited By John Baguley on 22/08/2019 16:08:39

Thread: Good YouTube videos
15/08/2019 17:54:46

Look for his videos about the 'Wrong Foo' mill

Others of interest:

Geoffrey Croker, Mustie1, Abom79, BigClivedotcom, Rolingmetal, Mark Presling, MrPete222, Randy Richard, Nick C Colyer, Steve Summers, Vortecks (builds insane electric bikes!), myfordboy, outsidescrewball, ROBRENZ, James Kilroy, Winky's Workshop, Halligan142, The Backyard Machine Shop, Old Iron Lover, Everett's Workshop, BasementShopGuy, etc.

No wonder I get nothing done!


Thread: Remembering Apollo 11
17/07/2019 00:27:29

I would have been 15 at the time and watched the landing in my bedroom on an old 12" black and white TV that I had repaired. I stopped up all night to watch it as I think it was in the early hours in the UK? I think I scived off school the next day!


Edited By John Baguley on 17/07/2019 00:29:01

Thread: A little rant about Emojis and their kin
17/07/2019 00:13:10

Political correctness gone mad!


Thread: Myford Vice for Vertical Slide
13/07/2019 01:01:08

Hello Mike,

I'm not sure without looking in the workshop but on mine I think I just machined the corner square with an endmill for the reason you state.

It doesn't really get used nowadays as all my milling is done in the milling machines.


Thread: donkey pump
24/06/2019 22:07:24

Hello David,

I've just had a look at the drawings and they are not very clear at all for the pump!

To clarify for others - on the full size NZR Ab loco, the pump would have been an air pump for the brakes but on the model it is used as a boiler feed pump.

The two pipes teed together are the exhausts from the top and bottom of the steam cylinder and the exhaust pipe goes along behind the handrail and up behind the chimney.

The connection in the middle of the steam cylinder (marked 5/32" x 40 on the drawing) is the steam feed to the pump and should be connected to a valve in the cab via a displacement lubricator.

The outlet from the pump valve box marked 'to Air Tank' is the water feed from the pump and goes to the righthand clack on the boiler. I'm not sure why it says 'to air tank' unless the pipe goes through the dummy tank? I can't actually see any details for the air tank though.

The water inlet to the pump must be connected to the bottom of the valve block somehow but I can't see how from the drawing! I can only assume that there is some sort of fitting that attaches to the bottom of the valve box that is not shown.

I'll be very interested to know if you manage to get the pump to work as they are extremely fiddly to get going, especially in such a small size.


Edited By John Baguley on 24/06/2019 22:08:22

Thread: boiler parts
09/06/2019 18:32:19

To me, they like as though they could the bottom fittings of more water gauges. The larger diameter threaded stub has a flat bottom recess which would take the bottom end of the gauge glass. The long threaded stub would thread into the boiler and have a locknut to secure in position once lined up. The tufnol? headed spindles could be shut off valves.

They seem to be lefthand and righthand fittings of a matched pair.

Could be totally wrong of course!

Have you got a photo of the other side of the fittings?


Thread: Injector Testing
23/05/2019 00:28:34

Hello John,

Just a thought but have you checked to see if you are indeed getting full boiler pressure to the boiler inlet of the test unit? Maybe there is a restriction somewhere that is reducing the pressure? It sounds as though there may be a problem with the test unit.

Paul - I fitted a valve to the outpipe pipe from the test unit so that I could restrict the flow produced by the injector. If you do restrict the output then the pressure should increase. I've had an injector produce double the boiler pressure before now.


22/05/2019 00:47:08

Hello John,

I used a modified version of the Bill Carter test unit which had a simple piston fitted with an O ring. When the injector output pushed the piston against the boiler pressure side the O ring uncovered an outlet port in the bore of the test unit. It seemed simpler to make than the coned seat and coned end on the piston of the Carter design.


When testing an injector I always found that the indicated output pressure was higher than the boiler pressure, sometimes considerably so. I would have expected the Carter unit to give similar results. I am not sure why your, or rather your friends unit should indicate such low output pressures?


Edited By John Baguley on 22/05/2019 00:48:58

Thread: What DRO to get?
17/04/2019 23:40:41

Hi Ken,

Yes, I went down the direct from China route as the cheapest option. I bought a Sinpo 2 axis for my Chester Eagle 25 mill as Sinpo seem to get good reviews.. My logic was that most of the ones that you can buy in the UK come from China anyway.

I paid £264 which included the postage and had to pay another £20 VAT when it went through customs. Took a couple of weeks to arrive but have been very pleased with it. Best thing that I have ever bought. The DRO and fitting a VFD drive to get rid of the tedious belt changing have made the mill a pleasure to use..

dro 1 small.jpg

It's been fitted for nearly a year now and is in constant use with no problems. There were a couple of plastic end caps for the covers missing but that was no big deal.


Edited By John Baguley on 17/04/2019 23:42:58

Thread: 4ba one-size-smaller half nuts
26/03/2019 11:19:31

Alternatively, buy 5BA and retap them 4BA.


Thread: Denham Junior Mk2 Drawbar
12/03/2019 17:28:22

Mine's 3MT. Just been and checked smiley


Thread: Thick walled copper tube
11/02/2019 23:44:06

Hi Keith,

I finished off a couple of Tich boilers for someone some years back and had the same problem. I just used ordinary thin wall copper tube and silver soldered bronze ferrules on the ends. One was threaded to screw into the blower valve and the other threaded 1/4 x 40 to screw into the bush in the front tube plate. You could also just silver solder the tube into the blower valve. I did that on my Helen Long boiler.


Not a good photo but you can see the blower stay at the bottom. You don't need the double threaded fitting on the smokebox end. The end of the ferrule is countersunk and the blower pipe just fits straight onto that.


Edited By John Baguley on 11/02/2019 23:44:55

Thread: 3.5" Locomtive
29/11/2018 00:53:00

Yes, definitely a Fayette but whoever built it deviated from the drawings a bit and used some Bonds castings for the trailing frame and the rear truck (the drawings call for built up items for these). The frame stretcher behind the cylinders is also a Bonds casting. Fayette is a nice loco and runs well. Hope you manage to complete it.


Thread: Ayesha 2 and bigger chaps
02/11/2018 18:42:54

I'm probably a bit biased but I get to drive LBSC's Ayesha whenever I want. It's well worn now but has no problem pulling me and heavier drivers.

LBSC was always extolling Ayesha's passenger hauling capabilities and said that he often pulled more than two passengers as well as himself. I'm sure that the old girl would still pull a couple of people given a suitable truck and some decent steel rail for adhesion.

I think of more importance than the power of the loco is having a very free running driving truck. Quite a few of us have changed to the David Hudson design with the self steering axles. These are very free running indeed, especially around curves and take very little tractive effort to pull along.


Thread: What have i got here?????
09/10/2018 12:13:45

Hi John,

I can't find anyone who sells the drawings for Green Arrow but I can let you have a copy of the articles if that would help? All the drawings are in the articles so you don't really need the full size ones anyway.

It looks like you have most of the castings and anything missing could be fabricated.

Model Engineers Laser do some parts for Green Arrow including laser cut tender bits.

You should be able to get drawings etc. for the Project from the G1 Society. I think they do a booklet for it.


08/10/2018 21:38:06

Just had a look at the articles. The chassis and probably the castings are for Green Arrow but unfortunately the boiler is not. Green Arrow has a wide firebox coal fired boiler whereas yours is a shorter narrow firebox boiler either gas or spirit fired. Possibly meant for something like the Gauge 1 Project?


08/10/2018 21:27:07

I would say that it is the Gauge 1 2-6-2 Green Arrow by Martin Evans described in ME starting In October 1971. Not sure if anyone still does castings for it.


Thread: Convex buffer face
21/09/2018 00:35:56
Posted by Mick B1 on 20/09/2018 21:46:16:

I've never actually done this, but an experienced turner showed me a method using a pointy rod the length of the required radius located in deep dot-punches below spindle centreline on headstock and crossslide chuckside face.

You use the saddle handwheel to keep the radius rod in contact both ends, whilst traversing a tool across the workface. The saddle moves away from the chuck to generate the radius. You arrange the tool so that it reaches centre when the radius rod's parallel to the bedways.

It's fiddly, but it's simple, accurate and I've seen it work.

Edited By Mick B1 on 20/09/2018 21:49:23

That's how I do mine:


The method was described by Tim Coles in ME Issue 4277.


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