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Member postings for Dave Smith 14

Here is a list of all the postings Dave Smith 14 has made in our forums. Click on a thread name to jump to the thread.

Thread: Multi-dimensioned Drawings
07/04/2021 09:59:04

Nigel

I agree with your comments above. The drawing in the opening post is one of the most diabolical pieces of rubbish I have seen. Ignoring any standards, they are to a certain extent irrelevant, the purpose of a drawing is to provide with clarity and without any ambiguity all the information required to manufacture or assemble an item. Initiative has never been a requirement for reading drawings. Another Interesting point, having spent 40 years working as a Design Engineer ending up as Chief Designer in industry, I had never come across the term 'bare' until I looked at the drawings for my Aspinall. I had to Google it to make sure I understood the context!

Dave

Thread: Using two torches
06/04/2021 09:36:04

I use a single regulator with a y piece (with taps) so I can use either my sievert or oxy/propane kit. Have not tried running both together though.

Thread: Hi from Hampshire U.K
26/03/2021 13:20:40

Greetings from Waterlooville.

Dave

Thread: Anyone done any Nickel or Chrome plating of mild steel parts at home?
25/03/2021 12:49:30
Posted by John Smith 47 on 25/03/2021 01:49:37:

We are hoping to use some grade of ferromagnetic stainless steel (nobody thus for can tell me which!), but if that fails to have enough magnetic pull, we may be compelled to a mild steel which we would then plate to make it corrosion resistant.

John

Austenitic stainless steel is non magnetic and is what most people recognise as rust proof Stainless Steel ( althouigh some grades can rust stain). Martensitic Stainless Steel does have magnetic properties, how ever it is at best a corrosion resisting steel and will rust in the correct conditions.

Thread: Making hexagon nuts on a rotary table & mill.
15/03/2021 15:36:55

Forget rotary tables a Hex Stevenson Collect,Chuck is what you want. ARC do them. Just made a load of ferrule nuts with mine. The square one is equally good and gets used more.

Dave

Thread: SIF bronzing a crack in cast iron.
13/03/2021 23:53:37

Andrew

What about Oxy/Propane. You already have the necessary kit you just need oxygen bottles. I use hobby weld ones. One off charge then I think about £33 for a refill. They are not as big as a portapack bottle (about 500 mm tall) but I use mine about two or three times a week and the oxygen seems to last me about 10 to 12 months. If you were doing a boiler you may need a refill.

Dave

Thread: Design of boilers
05/03/2021 13:49:26

SOD

Nice off the wall list. But what about the aerodynamic part of the equation. A long tall boiler will compromise the drag compared to a short thin on. Whilst drag is proportional to the square of velocity even a low speeds it will have an effect and it would be an interesting trade study to what wins out.

Dave

Thread: Brazing silver steel: any caveats/recommendations?
04/03/2021 13:02:36

I regularly make up extended drills, I normally silver solder them. I also do the same with sockets also reducing the diameter of them. For these I normally silicon braze as its cheaper.

Dave

Thread: Kingscale 5" models
22/02/2021 15:36:43

Whilst it is probably not what some people would want to hear. You are buying a product not the design, that is is Kingscales IP. It is the same for any commercial product, you would not expect to get all the drawings for a car or a toaster. What I would expect however is a set of maintenance instructions and a full spare parts list with exploded diagrams.

Dave

Thread: Class 22 Diesel (next project)
21/02/2021 13:47:11

Ron

Sorry if this is teaching you to suck eggs then disregard, but with weathering make sure you use a photograph of the prototype as a guide. It is the only way to get realistic weathering.

Dave

Thread: Have You considered getting a 3D printer
21/02/2021 10:46:47

Jason

Some finished parts which are not tooling, although I do use my printers for tooling.

Toothbrush holder, not reprinted in white and at 0.1 mm layer

img_2556.jpg

Boiler for LNWR crane tank in 4mm scale

img_1332.jpg

Replacement nose for rocket on Grandsons toy

borh2173.jpg

Bin liner containers for my sons 4mm scale layout

img_2047.jpg

Various tests for 5" gauge loco lamps (my own design)

img_2153.jpg

Edited By SillyOldDuffer on 21/02/2021 10:51:03

Thread: Covid test
14/02/2021 22:24:13

Wife and I both 65 had the Astrazenica jab last Friday at our local surgery 10 mins walk down the road. In and out in 5 mins, because if you walk you do not need to rest for 15 mins. Wife had no reaction at all. My arm is a little sore, but had stomach cramps for about an hour Friday night. If you read the data sheet that you get given with the jab, this is a potential side effect. The whole thing was well organised and very efficient.

Dave

Thread: Ultra sonic cleaning
11/02/2021 21:58:37

I use Allendale general ultra sonic cleaning solution in my 2L heated version. All my machined and small soldered parts go into his machine no matter the material. For delicate stuff, watches, jewellery, 4mm scale loco chassis and bodies I have a small unheated one I put warm water and washing up liquid in.

Dave

Thread: crane uprate - where would you add some metal ?
11/02/2021 09:07:54
Posted by Martin Kyte on 11/02/2021 08:41:26:

The weight of the load is at the hook but the mass is where it was. The force moves not the mass.

Martyn

Nice point which many people are unaware of and hence it gets misused, that mass is different to weight.

Mass = Density x Volume

Weight = Mass x gravity

Essentially on Earth Mass = Weight. However on the moon the mass of an object remains the same but its weight is much lower due to the lower gravity.

Dave

Thread: Engineering / Modelling Books for Winter Evenings?
10/02/2021 10:01:45

Slide Rule by Neville Shute. His biography of his Engineering activities, an excellent read.

Vulcan 607 by Roland White. The story of the first Vulcan raid on Port Stanley during the Falklands. You will not be able to put it down although you know the story.

Handbook for Railway Steam Locomotive Enginemen. This is the bible given to engine crew by BR.

book.jpg

If you search the internet you will find it as a pdf file. If you have problems message me and I will send you a copy.

Testing Years by Roland Beaumont. He had long career flying in the war then as Chief Test pilot for English Electric. He was the pilot who did aerobatics with a Canberra at Farnbrough.

Wings On My Sleeve by Eric 'Winkle' Brown. He holds the record for the most types of aircraft flown (487) including the Messerschmitt ME163 Komet! He also holds the world record for the most carrier landings.

Some to go on with.

Dave

Thread: New Start on LBSC's 3.5" Petrolea
08/02/2021 19:45:16

Dave

I have a full 3D model of the Don Young Aspinall I am building and I work from that not Dons drawings, only using them to tick off what parts are finished.

However for someone who has no access to CAD I think you have got it about right. The only thing I would add is that the critical parts can be easily checked as an assembly on a drawing board. You do not need to fully detail each part or all parts only the bits that interact with each other. After all this was how the loco would have been designed and how things were done before CAD. I reckon with a full set of drawing available you can do it in 3 or 4 days tops.

Dave

Thread: Class 22 Diesel (next project)
07/02/2021 15:10:01

Ron

That really is looking good. Are you going to detail the bogies and underframes, it would be shame not to?

Dave

Thread: Design of boilers
05/02/2021 18:41:33
Posted by Andrew Johnston on 05/02/2021 16:23:31:
Posted by Dave Smith 14 on 05/02/2021 16:14:58:

.......By the way he uses the Stefan Boltzman equation.

The difference vis-a-vis another poster is that Martin understands it. smile

Andrew

yes

Dave

05/02/2021 16:14:58

If it is the article I remember, Martin's article is about predicting the performance of a boiler from first principles. The calculations take the form of an excel spread sheet. Martin was quite happy for people to have a copy of his excel file and you get a paper he wrote explaining all calculation method involved. By the way he uses the Stefan Boltzman equation. I have a full copy of all of it, however the copyright is Martins and so cannot let you have a copy. If you talk nicely to Jason or Neil they may be able to help with contact details or someone else who has access to a paper copy, which I don't. The articles are in the flash player digital copies which I can no longer read.

Dave

Thread: 5" Maid of Kent Build Log
04/02/2021 19:47:48

William

Agreed with using MECH for your queries, you will find good advice. I mainly post there as I am building a DY L & Y Aspinall class 27 which is a 5" gauge loco.

Dave

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