Here is a list of all the postings Luker has made in our forums. Click on a thread name to jump to the thread.
|Thread: Ballaarat construction series|
Hi Guys, no pain happy to help!
I've never bought from the ME trade (other than two gauges) so I'm afraid I can't help with the fittings, I make all of mine including the injectors.
The sight glass I use comes from the chemical industry and is 5mm OD, I think with a 0.9mm wall thickness. I buy it in 1m lengths and costs next to nothing.
The blow down is easy to make.
A 10Oz injector will work nicely, and yes I have fitted one on the RHS.
The water tank is in my drive-on tender. There is a tank under the footplate but this is filled with lead to improve the weight distribution of the loco.
With the crosshead pump and injector you won't need a hand pump. Most boiler codes require two methods of feeding the boiler.
I would buy the pressure gauges, unless you want to make your own, which would be far more accurate...
|Thread: Fire Queen construction series|
Yep, it’s modelled in 5g (spot on... 1.25" to the foot or 9.6 scale factor). It’s a small loco, smaller than the Ballaarat, but with similar design tractive effort. The model is very close to the original, and the designer of the prototype was decades ahead of everyone else in many respects. The sub-frames are a boxed construction and incredibly strong even when scaled down for the model. There are a few cheats to improve strength for our track but not many…
One common theme in the series is how I dealt with tolerance stack up, both on the machining and assembling side of the build. With the sub-frames, slanted cylinders etc. small deviations ended up compounding very quickly!
Hi fellow builders; here’s a sneak peak of my next construction series. It’s a complicated build; so the series does not focus on the detail but more on the interesting bits like the use of some ‘new’ alloys and machining techniques. The series also looks at some of the myths surrounding this exceptional loco. Just so that the old hands don’t feel left out, one technique (used to plate the expansion link) was in common practice before this loco was first steamed. I hope you guys enjoy the write-up! When the series get going I’ll add the odd photo etc. to the forum…
|Thread: Ballaarat construction series|
For the guys following the Ballaarat series in ME; a fellow reader and builder is going to contribute to the series and broaden the design. I don't want to spoil the surprise, but I'm looking forward to seeing it in print (I've just seen the drawings, so it will be new for me too).
On a somewhat related topic, I was doing some tests on my Ballaarat and needed a little extra weight. A friend of mine joined in the fun. I weigh a good 75Kg, my friend 90Kg. There was no shortage of power or steam, but there is a section with a rather challenging gradient. My William (3.5g tender 2-6-2 with very similar boiler size and weighs about the same) slips on this section with two adults. I’m reasonably sure the Ballaarat would take another person before slipping; next time…
|Thread: NEW CONTACT EMAIL FOR MEW EDITOR|
I really do feel for the editors of these magazines, it’s an unforgiving job juggling everyone’s ‘wants’ while walking the financial tightrope! I think authors that are innovative, can do their own designs and still string words together coherently are very rare. Then of course they need to have the time to do all the drawings etc. for very little money. I wonder how many pages (in a magazine) can be filled with articles from this dying breed of writers! I personally enjoy reading the ME magazine; it has a nice balance of journalistic articles and technical articles.
|Thread: Ballaarat construction series|
Hi Tom, here is an exported JPEG of the boiler GA, I’ve added two views that should give you all the dimensions you were looking for. If I’ve missed anything please let me know and I’ll update the drawings and post them on the forum. I did have a look at the design and I do need to point out that this design was specific for stainless, and although not difficult, would require some re-work to make it suitable for copper. Items like the lower gauge glass position and steam volume are specific to the top of the crown and for copper this is where changes will be needed. If not done correctly it will affect the performance of the loco.
The water space between the wrappers also needs to be checked for copper to make sure you won’t get steam jacketing especially with nominal calcification. Counter intuitively the stainless boilers outperform copper boilers due to this and other factors.
Hi Tom, other builders may also need these drawings. Let me see what I can do, hopefully I can upload something to this thread...
Hi Tom, ok I see what you're looking for. There are multiple sheets for the boiler in my drawings, but I condensed them for the articles. All these dimensions are on the detailed sections.
Can one of the admins help me with uploading pdf's?
Hi Tom, this should do it. You shouldn’t have any issues converting the boiler design for copper. Just check the stress in the crown area if you remove the crown stay for rod stays (Aus boiler code). I’ve found the code is a little light in this area… (see: Modern boiler construction methods for the model engineer)
|Thread: Material for wheels|
One more option... You could laser cut the inners (blind river and/or solder) and shrink fit a tire on (hollow bar). The spokes are square anyway...
|Thread: Modern boiler construction methods for the model engineer|
Steel boilers tend to solve nicely in FEA, they don’t have the non-linear material properties typical with copper. Your simulations look good, and it’s good to know that other model engineers are using modern techniques to move the hobby forward!
It’s interesting that you also found the (crown) rod stays in the Aussie code to be marginal. For the Stirling mentioned in the article (my avatar loco) I built the boiler to that code using crown stays and I also found the code to be marginal (in fact there’s a few aspects of that code that can be improved upon). I also had to do a little redesign in this area. The crown stays are stronger and all my later boiler designs use this configuration.
I think the problem with crown stays comes from the old days where the silver solder came loose with subsequent heating, but with welding this is not a problem. I’ve also seem two boilers recently where the cross strut was left out, and the comment was that little plate does nothing. Took a little explaining as to why that little plate is so important for the crown stay!
For the record, I don’t want to create the impression that all boilers need to be verified with FEA. If the design is published, or proven and built to the drawings then no calculations are needed and you have to assume the designer has done his bit. The only reason I have had to use FEA in my designs is because they use materials and manufacturing techniques not commonly used in ME.
Thanks Jon, aren't we all!
The recent articles in ME on my methods of boiler construction using 'modern' techniques and materials hinted to the FEA simulations I do on all my boiler designs to check that they are safe. Here's a short video of two very different boilers I have built, one a Martin Evans copper boiler and the other the Wahya. Both simulations evaluated the stresses for the pressure test and the running conditions of the loco when in service. The failure modes for the pressure tests for the two different materials are similar but for running the design considerations are different. I hope you guys find the videos interesting... Something different in ME...
|Thread: Backyard Foundry - oil burning furnace - moulding and casting a spider|
I really am spoilt with the 3D printer, if I need a pattern I just draw it up and print it overnight. Next day I can normally cast the component. Not like my first loco where all the patterns were from wood. That alone took a few months!
For the fellow foundry-men...
These are astonishingly beautiful! That rose would work really well in a nice jewellery box for my misses...
|Thread: Micro rivets|
If they not structural pins work. Just use retaining compound instead of peening the back ends.
|Thread: The RSME spring live steam meet|
Hi Guys, a fun video of our Sir George (club loco). I took the film yesterday during our steam meet...
|Thread: Engineering tuition recommendations|
Zoom or something similar is a really good idea! The young builders at our club often send pictures and videos to each other on private groups for advice and guidance. We have experienced builders on the groups that normally help with pictures or a voice-note. The rule is you need to be upfront if you actually haven't performed the task yourself.
|Thread: Rear section of boiler wrap holding in place|
Hi Michael, I used rolled angles to keep the cladding in place, then you don't need to fix it to the cab. The outer angle is fixed to the cladding but just rests on the front cab plate. The inner angles are fixed to the cab and not the cladding. My boiler can expand without any rigid fixing to the back cab. My cladding also doesn't go between the frames and boiler, and the back strap is not functional. Hope this helps...
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