Here is a list of all the postings AndyA has made in our forums. Click on a thread name to jump to the thread.
|Thread: BSF fixings|
|Thread: One off castings|
When dealing with suppliers I always find I get a better response by expalaining that I'm not looking for a cheap job or something for nothing. Once they know you want a fair job for a fair price I don't have any issues.
Model engineers can be famous for knowing the price of everything and the value of nothing. I remember standing at a suppliers stand one year where someone wanted a gauge glass. The response to the asking price was "How much, I can make one for less than that...' The person was told to go away and make one then. With attitudes like that are we surprised commercial companies don't want to know?
Swan foundry cast the front and rear rolls for my steam roller. I have also used Wagstaff's at Colnbrook for castings. Both are great people to deal and will do you a quality job.
|Thread: Are Model Engineering Exhibitions The Same|
From experience building a large model needs large lumps of material and a shopping bag isn't going to cut it! I saved a fortune in postage collecting material from the shows all of it large and heavy.
Playing devils advocate, the other side of the argument is to respect someone elses personal space and not get so close their rucksack is a problem to you. Just saying...
|Thread: Draft Site G code generator|
Thanks Russell, I will investigate further.
Is there a free version of Fusion 360 still available? I thought it had gone to a free for 30days trial period.
|Thread: 'Free-Wheeling' a Steam Loco?|
Without steam it is not possible to reliably lubricate the cylinders on a steam engine as there is nothing to atomise the cylinder oil and carry it around the steam circuit. For this reason a 'dead' steam loco is generally towed without the connecting rods in place. You can remove the pistons but it is a lot more work and still leaves a bearing on the end of the Con rod with the risk of it running hot. Valves can be disconnected from the radius rod and the gear positioned so that any derived motion will not interfere. Bearings on the motion are generally wick fed so will continue feed oil without the need for steam and hence can generally be left in place.
|Thread: John Stevenson|
RIP John, rest in peace.
|Thread: FOUNDRY TECHNIQUE|
The answer may depend upon what you want to cast and its size. Working on the basis that you are competent with one of the 3D CAD packages you could go the route Neil suggests and get a pattern made in PLA and then either investment cast or burn it out as part of the process with sand casting. You need to speak to the foundry if you go the PLA route as they will have to be happy with the process and confident they will be able to get rid of any gas produced as the pattern is burnt out. The limit with this process is going to be the size of the item you want to produce and the ability to get the patten 3D printed.
You could go the ExOne route and get the sand directly printed. When I was looking to get the forks and headstock cast for my 6" scale steam roller the quotes were eye wateringly expensive.
The other method, which was the one I went for, was to use Polystyrene patterns. I emailed of an STL file and 4 weeks later collected some very big heavy castings. In this process the pattern is CNC machined from lumps of poly which are glued together to make the final item. Undercuts can be accommodated as can other features which would have traditionally needed a core box. Use one of the specialist companies as the process has its challenges and not all foundries will cast from poly patterns. Again getting rid of the gas as the pattern is burnt out can be a challenge and lead to porosity if not done properly. Finish could also be issue, if you need a good finish on as cast surfaces be prepared to put some effort in to cleaning the casting up.
|Thread: Deep Cycle 12V Batteries|
I looked at batteries recently for powering my trailer winch, the thing that struck me was the discrepancies in weight for batteries which were supposed to be of a similar capacity. The supplier eventually admitted to me that most deep cycle batteries where no more than high quality car batteries.
|Thread: Boiler Welding|
Not that unusual to have so few stays on a steel boiler in the UK Jason. My 6" engine with a firebox side plate 16" x 12" only has 16 stays.
|Thread: 3" Burrell agricultural engine|
Live Steam Models used to supply the castings and drawings for the Foster style lubricator. The more prototypical lubricator may be the Manzel lubricator and Little Samson models have drawing for those in 6" scale which you could use as a guide.
|Thread: Traction engine tyres|
If you think stick on tyres are expensive don't even bother thinking about Vulcanised tyres!
|Thread: Help with lost wax casting|
The biggest problem your going to have is with the contraction allowances. You need to find a way of allowing for both contraction in the wax and of the cast part. I would investigate replicating the part with 3D printing first and enlarging it to allow for the above contraction. From memory this is somewhere around 1.5-2%
|Thread: disappointed - feel I have been cheated|
So does that mean you need accounts with both MTM and Pocketmags?
|Thread: Lost wax casting advice needed|
For two off it may be worth the small extra cost of having them printed in wax which is then burnt out in the traditional way. There is a supplier of steam fitting who uses this method and may be able to help you with these.
|Thread: PGK's 1" Minnie|
Hi Pgk, Here is the advice I gave someone else building a boiler a few years ago. It's a tried and tested method
I start with the barrel, then solder the dome bush and front feed bushes followed by front tube plate with any attendant bushes. Soldering in this order allows me to see the reverse side of the join and check for full penetration.
|Thread: Xmas in the workshop/shed|
I've got a set of rolls which need turning and a front fork to finish.
|Thread: Model Engine Maker|
Its not working for me Jason. I get an error message reporting 'too many processes'.
|Thread: Gosh trying to line a Loco is so hard any tips|
Craftmaster Paints - http://www.craftmasterpaints.co.uk - carry a range of lining tape. Stick it on, peal off the cover, paint between the lines and then remove.
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