Member postings for Dave Smith 14

Benedict

Tube and plate thickness is established using the working pressure and tabulated data, no calculation required for any of it. Stays size/pitch etc are also tabulated although there are formula for you to use if you need to go off-piste.

Dave

I have their 0-25mm and 25-50mm versions, had no problems with them.

Dave

One of the best sources of small metric fasteners, not cheap though.

GWH

I think Jason uses them as well.

Dave

Very Sadly Eileens Emporium have gone into administration. This was posted on a number of modelling associated websites on December 11th.

I am very sorry to have to tell you that Russan Limited, trading as Eileens Emporium has ceased trading and appointed liquidators.We have done our best to send out all the stock we have for pre-paid orders. I am sorry that we were not able to complete all of them.

Any clains against the business should be sent to:

Christine Vaines, Begbies Traynor, Suite C 11 Kingsmead Square, Bath, BA1 2AB | T: 01225 316 040 | Email [email protected]

m2.5 studding is available at many sources on the internet just google it.

Robin

The part deflects along the axial plane. So the red maximum deflection zones bend backwards towards the headstock.

Robin

Generic FEA of the part you are trying to machine. First picture shows the model with jaw forces applied. Second and third pictures both show the way the parts deflects, Values are not important it is the indicative pattern we are interested in. Blue is small, red is large relatively.

Regards

Dave

Ian

I think we are talking at cross purposes. Yes you can edit the imported solid works file same as you can edit a step file, it does not matter what mode it is in. But you cannot edit it by the history. So for instance you want to remove a hole. With history you just delete it. As a dumb solid you will have to fill it in. Not normally a problem, but it gets more complex where compound surfaces are involved.

I am not an expert on SE (I use Catia V5), only using it occasionally. However I have just imported a Solid Works file straight in the SE. However it appears to be a dumb solid so no history

Birchwood Casey Aluminium Black if you do not want to spend very much

Aluminium Black - Ebay

Nigel

Any 3D CAD system can create a hollow cylinder like you asked. Here is an example with flanges added at both ends as well. All done with a single 2D sketch which you can see in the picture.

Ask the same question on RMweb you are more likely to get more response.

RMweb

Dave

Luker

Similar to you I used FEA on ME boilers. First photo a section cut through the FEA on a steel version of the Highlander Boiler. I did this as a favour for a member of this forum and wrote a full report which used 3 justifications, first principles hand calculation, a comparison with the Aussie code and the FEA. This was done before not long before I retired and I had my Chief Stress Engineer do the a peer review on the FEA methodology and results as a check. The FEA showed up some issues with design as presented to me and allowed me to easily modify the design to eliminate the problems.

I am also building a Don Young Aspinall. I have modified the boiler to remove the crown girder stays of the original design and replace them with crown rod stays. The boiler design was checked to see if it complied with and then modified in accordance with the Aussie code, how ever I also carried FEA on the boiler as designed and modified to for rod stays. The FEA results were quite interesting. The crown girders are very benign with reasonably low stress. However the some of the crown rod stays when designed in accordance with the Aussie code guidelines were marginal and needed to be increased in diameter to get the levels to a point where I was happy with them. The change to stays has been cleared with our BI's to the Aussie code but they are aware that the FEA has initiated further modification and fully endorse it. Little steps, but I am lucky in that one our BI's is a retied professional engineer like myself. Second picture is from the Aspinall FEA.

Over on MECH, this thread details painting a Stirling.

Stirling Single

Duralac is the yellow conformal coating used to protect interfaying surfaces in a lot of Aerospace applications. The permanent joints on my tender and loco chassis are using it.

4 Years into my Aspinall class 27 build, I have a complete tender, chassis running on air, smoke box and all plate finished and a most of the boiler parts made but not assembled. Nothing is final painted yet. So what is my advice at this point. Do your research and built what you want to, which is what I did. A 4-6-2 Pacific is no more difficult to build than my Aspinall just a few more parts to make. Laser cut anything you can, you can break complex parts into layers which can be silver soldered together. Only use castings where you have too, for a lot of items it is easier, quicker and a lot cheaper to hog from bar. I bought a complete set of casting (in a sale) but the quality was very poor and the tender axle box castings were not fit for purpose and binned. Boiler, your choice I am making mine. Oh and enjoy the process it can be very frustrating at times but ultimately very stimulating.

Nigel

To echo Jason's comments, if you go for a low end machine you could be running into trouble as you get more proficient and model sizes increase. CAD systems are very memory hungry and need high end graphics cards and lots of RAM to run properly. My laptop is now 4 years old and has a quad core i7 processor and 8 Gb of ram. The graphics card is an INVIDIA GTX1050 Ti. I find this only just copes with the full 3D model of my Aspinall Class 27. I am considering changing my laptop as I have a damaged case, one screen hinge has broken and the battery is knackered and I will go for 16Gb ram this time and upgrade the graphics. I expect to pay at least £1K for a new machine to give me the power I need. I could probably get it cheaper using a tower system, but the laptop suits how I use the machine. I use a firm called Novatech for all my machines, they are a local independent manufacturer to me based in Porchester Hampshire.

In summary go for the most powerful system you can afford/are prepared to pay for.

Owl castings.

Metal Casting | Owl Castings | England

Steve

Get a copy of the Australian Boiler Code, AMBSC. Part 1 cover copper boilers. If you work to that in conjunction with your Boiler Inspectors, you should not have a problem. If you want a copy of the code PM me with an email address.

Yes.