Portable Engine Model Engineer Article by Tony Webster

PS Any unsigned posts by me will be replies from Tony Webster.

Edited By David Clark 1 on 07/03/2012 14:00:39

Edited By David Clark 1 on 07/03/2012 11:47:51

Edited By David Clark 1 on 07/03/2012 11:48:07

In typesetting my hand written dimensions for publication, in the end section to the right of the drawing on page 364, the 11/16in. dimension to the first row of stays should be from the top of the foundation ring as shown in the door plate drawing to the left. Also the 1/4in. should be for the foundation ring only and not include the firebox wrapper plate.

The front to back location of the water gauge bush and manifold will be detailed in a further instalment of the series. There is no harm in having a static connection to the water gauge, ie a pressure gauge where there is no movement of steam or water through the manifold. I agree that there must not be a connection to the blower or injector etc. from the water gauge. This would have a misleading effect on the water level in the water gauge.

Thanks David good to try and keep all these things in one place.

A few more questions regarding the boiler drawing in 4425.

1. Depth of flanges to inner firebox and throat plate

2. How far does inner firebox protrude below foundation ring

3. Drawing says 2off regulator bush, where does the second one fit

4. Should there be any thickening pad inside the boiler to mount the crankshaft bearings

5. Should there be blind bushes to mount the firedoor Hinge

6 Confirmation of an available thickness for copper in substitution for the 3/32" and 1/8" thicknesses shown on drawing.

Thanks, Jason

Edited By JasonB on 07/03/2012 13:15:54

Cylinder drawing issue 4426.

1. No setting out positions for the 10No valve chest stud holes or will they be detailed with the valve chest.

2. Text says machine valve face back to lines 1 & 2 but drawing shows it at least 1/32 away from them.

3.Length of cylinder and protrusion of end faces not shown on drawing but can be found in text.

4. No depth for steam port slots

5. Brass tube, I'll wait to see what teh text says before commenting.

From the comments in about the last issue I got the impression there was going to be another boiler drawing has this been missed or is it to follow out of sequence? In 4426 it would seem the boiler is "complete " and tested yet the details mentioned two posts above have not been covered??

J

Errors & Ommisions 4427

1. Width of Valve chest given as 3/8" but should be more like 1.5"

2. No length given for piston rod

3. Crosshead, no thickness given, probaly 5/16" to suite the slidebars but the 3/8" spigot is not shown to suit that.

David there are now three issues worth of queries, any chance of some answers?? as you did say this thread would be for corrections!!

Jason

more 4427

1. No depth for piston ring groove

2. No length of 1/4x40 thread on piston rod

3. No depth for cut out in cross head, looks about 1/2"

Hi There

Tony Webster has been away.

I will chase him up Monday but I don't know when he is back.

regards David

Hi all

Any chance of a few more pictures of finished components or close ups of the finished model, to make it easier to understand some of the text and diagrams.

Hi There

I have a few photos to publish but most are pretty poor quality.

regards David

David if they are a bit too poor for actual printing what about just adding to this thread so those that need the reference have access to them.

Another thing that would help would be to try and syncronise the drawings with the text for example the description of the cylinder covers in the latest issue is very hard to follow but I'm sure once the drawings appear hopefully in the following issue the text will make a lot more sense.

J

Hi There

We don't have rights to put unpublished photos on the websites.

Rear cylinder cover drawing is in 4428, front cover in 4429.

regards David

Why can't it be done like the Darjeeling ref photos, none of them have been published, You would only need to Ask Tony if it was OK.

Failing that if I see it at another exhibition I could take a load of photos and stick them in an album

J

Hi Jason

I took the Darjeeling photos.

They are my copyright. That is why they are on here.

regards David

Fair enough.

This wil take anyone interested to the only pic I have of the engine, there is another one on the net that I will dig out the link for when I have a bit more time

Edited By JasonB on 02/04/2012 13:04:00

Hi There

I do have some photos that I took at exhibitions.

I will dig them out.

regards David

Hi, I have put a photo that I took of Tony's engine when on display at Sandown, in my album named Portatable Engine, if anyone is interested in viewing it.

It is similar to JasonB's link, but at a slightly different angle.

Regards Nick

Edited By Nicholas Farr on 02/04/2012 20:55:43

Is there a full set of drawinging available to go with this series that will have all corrections included.

Sorry could not resist.

It would be nice if a lot of the newer models being published in the mag could be added to the MHS range of plans but somehow I don't see it happening, though most people contemplating a build in the future would likely track down the back issues anyway which would have the drawings in so why pay twice unless they had all revisions.

J