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Member postings for Stewart Hart

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

Thread: Injectors of Peter Cauley
16/09/2021 09:38:59

Just been in contact with Peter he confirms the sizes he uses for the smaller injectors for 5" G are as follows:-


I see we have some corrections in the computer articles Don’t know how they have cropped up the sizes should be for working pressure 80 to 100lbs sq ins

Steam cone inlet angle 13 degree

Outlet angle 9 degree

Throat no 56 drill 0.046" dia

Combination cone 9 Degree

Throat no 63 drill 0.037" dia

Del cone 13 Degree ( not 12 has pointed out in forum )

Throat no 68 drill 0.031" dia

Steam cone insertion 0.037" annular gap 0.0075"

Can you sort them out please:- they are the sizes I use for my small injectors


Hope this hasn't caused to much confusion


16/09/2021 07:49:41

Thanks for your heads up Bob,

It's not easy to spot your own mistakes it needs someone with the diligence to read closely, I'll revise things accordingly.

Bean in touch with Peter and he's extremely pleased that we have people prepared to give his design a go, and would like to know how you get on so please bring us up to date on your injector builds.


13/09/2021 08:44:16
This is a vertical injector I made with Peters help using his cone sizes
13/09/2021 08:39:40

Hi Bob I'm a good friend of Peters and he's seen this post and he's asked me to reply I've successfully made Peters Injectors so I'm a little confused what what drawing your using if you check your personal messages I've sent you a contact email address so that I can send you a copy of Peters drawings

Regarding Dags book you will find the bodies of Peters Injectors far simpler and easier to make and regarding the cone sizes and proportions Peters are very similar to Dags, but with all due respect to Dag some of his methods are overcomplicated Peters method of sizing the cones is simpler.


Thread: Reilang oil cans, fit for purpose?
09/06/2021 07:53:33


Hi Bryan

Her's a picture of my eagle type oil can, I've got a Reilang can and can say the eagle is just as good but in making it I did find one important thing out if you have a perfect seal the can won't work you need to let air into the top of the can to fill the space of the displaced oil as all you are doing is creating a vaccum, I also never fill it above the plunger as this is another area it can leek from, I regularly take the eagle to the track I just keep it standing up, that's why cans of this type have a nice flat base.

Take care I'll call soon


Thread: Injector LBSC type
31/05/2021 08:02:29
Posted by Speedy Builder5 on 31/05/2021 07:24:30:

I have sourced a copy of DAG Brown's book, and now thinking towards making one of those, however I need to source a 7/32 reamer which will take some time to get here in France, but won't stop me making the tapered reamers etc.

Back to LBSC's injector, the drawing shows a tapped hole of 5/32 x 40 for the water overflow.

5/32 = 0.156"

depth of thread 2 x 0.016" = 0.032

core diameter 0.124 (for the 5/32 x 40 thread)

assume 24 SWG( 0.022) for the tube gauge

0.124 - (2 x 0.022) = 0.080 max bore diameter of water overflow.

The water overflow is threaded into the injector body so that you can measure the distance between the end of the combining cone and delivery cone. I take Julian's point about the positioning of the steam cone which brings us back to "bare" dimensions !

I use a 5.5 reamer near as damit the correct size. As Julian said the critical feature is the annular gap and there is a way to get this correct, if your serious about having a go send me a PM and I'll send you the info and a drawing of a far simpler injector body than that used by Dag Brown, Dags cone proportions are spot on. Hers' a video of the vertical I made

27/05/2021 14:19:12

Don't waist your time and hair trying to build LBSC injector only with a good wind and a bucket full of luck will you get one to work. If you spend time reading LBSC build series you will see that his injectors keep changing especially the cone proportions subsequent work by others came up with far better proportions. Also his instructions on how to make them have got a lot to be desired he just says make them exactly to drawing there are some critical features that need a more detailed description on how to achieve them.

Just splash out and buy a couple from the trade.

I've made my own injectors and believe me they are not easy to make you really need some one to coach you how to do it


Thread: Clarke Tig Welding Gas Bottle/Regulator
16/05/2021 07:47:36
Posted by Dave Halford on 15/05/2021 17:52:57:

How did you check the regulator worked?

Thanks for all your help and advice chaps.

Dave:- I checked it with compressed air but read on.

The bottles are full checked them by compressing the valve with a nail.

Just screwed on the regulator without the pipe connection and it worked screwed the pipe connector on and it didn't repeated the checked and it worked/failed each time. The pipe connector is one of those where you push the plastic pipe in and it self locks checked connector with compressed air and it was ok. The only thing I can think that is happening is that the hole in the connector is too small (Less than 1mm) so the back pressure is stopping the regulator doing its job.

From all the comments these regulator are a source of trouble so I've just ordered another type of regulator.

Thanks for all you help


15/05/2021 14:47:27

I've been pulling my hair out trying to tig weld some stainless steel with my new tig welder I've used the welder successfully stick weld and this is the first time I've tried using Tig. I've coupled up with a flow meter and checked there is no leeks in the connector. I've screwed the regulator into the bottle opened the valve and the flow meter and there is no gas flowing the instruction on the bottle says " If the gas does not flow when the regulator is opened unscrew the regulator and screw down again until the gas flows. I've trued this countless times I've even bought a new bottle and this is the same.

I've checked the regulator and the flow meter and they are working correctly so the fault must be from the bottle.

What am I doing wrong or is there a fault with the bottle has any one else experienced this problem


Thread: Stewart Hart's Vertical Mill Engine
29/04/2021 16:41:50

Hi David

I'm sneakily watching coolas Jim said just send me a PM with your email address


Thread: Helping dad vertical engine
20/02/2021 08:01:44

Well done Dullnote

Runs nice and smooth and it will get better with use just requires a nice paint job. I hope you enjoyed the build.


Thread: Vertical Injectors from America
11/01/2021 07:46:21

Hi John

Thanks for the post I'll see if I can dig out that ME magazine I've not done any work on the injectors for quite a few months this might rekindle my interest.


Thread: Draft Site change of status and program down load not working
17/11/2020 11:13:29

I've been using draft site free 2D CAD for quite a number of years for those of you who follow my articles in ME and ME Workshop will be familiar with my drawings which were all done using draft site.

Draft Site caught up with me when my free licence expired No Problem I thought I'll just have to part with some cash for the basic licence at £100/year including fat its not as expensive as other drawing packages and I'm familiar with it.

Not wanting to part with my cash too soon I decided to try the 30day free trial down loaded the program fine, loaded one of my drawings up to try it out and non of the drawing features would work I didn't even have a cross hair cursor

After messing about for I bit I registered for the online chat room this didn't work either it wouldn't recognise my user name or password I tried resetting my password but I've had nothing back from them.

I deleted the programme and tried reloading it but this time I've got nothing.

I've contacted the help desk but so far nothing.

I'm afraid I'm quickly loosing confidence in the system

As any one else had similar problems


Thread: Lathe Tool Grinding
03/11/2020 07:51:11

The best and most accurate way to produce the formers is with an end mill of the desired size. Mount the former in a spin indexer or other similar device on the Mill and with the end mill of the requires size simple advance the end mill into the former and at the same time slowly rotate the indexer keep advancing the end mill until you've got the required depth you'll end up with a perfect radius of the correct size in the former. No messing about grinding forming tools


Thread: Virtual Meet Ups
02/11/2020 18:43:22

Yes please count me in


14/10/2020 16:09:50


Thread: Diamond Honing Wheel Setup on ML10
21/09/2020 07:15:26

Sorry about not getting the video loaded I'd forgotten how to do it. all sorted now after third attempt



20/09/2020 20:07:42
This my take on the same theme

Edited By Stewart Hart on 20/09/2020 20:13:54

Edited By Stewart Hart on 20/09/2020 20:15:32

Edited By Stewart Hart on 21/09/2020 06:52:32

Thread: Vertical Injectors from America
19/09/2020 17:40:47

Along with a friend we've been experimenting with vertical injectors with mixed success, we can get them to work but the problem is they are a bit bulky we want to get to a neater design..

There is a company in America that markets vertical injectors called eccentric engineering this is a different company than the UK company of the same name. From a sectioned photograph of one of these injectors you can see that they have sliding washer around the combination cone that closes when the vacuum starts. Full size injector use a similar system

My question is has anyone got any experience of using these injectors on 5" or 71/4" G locomotives in the UK


Thread: Potty:- Helping Dad Grasshopper Engine
28/08/2020 10:16:21

Hi Jason

They have the drawing on file and I’ve given them the okay to use it



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