andypugh

I recently (ish) bought 7kg of white metal for £130 from: http://www.jhrichards.co.uk/

But I imagine you were doing this in the era of detachable wheels and pneumatic tyres? I wouldn't want to bet that a double solid-tyred wheel weighs more than a modern truck wheel (I can imagine that those are very heavy) but the game here is sliding the wheel onto the bearing without damaging the bearing. And they are certainly quite heavy enough in the case of a Sankey disc wheel. :-)

That's a cunning plan.

I wonder if building up on the inside with metal-spray would be any help? Ben?

It does, doesn't it? I imagine the Goslings are already looking at Barn-U-Like catalogues to create the space.

One recent/soon 100th (tested 27th January, delivered April 6th) is Jezebel, the 1916 Dennis which has infected quite a number of impressionable young students with the "bug" over the years. https://union.ic.ac.uk/rcc/rcsmotor/

But, quite bizarrely, it is something that Estate Agents never seem to mention.

The Trailmobile Co name is still in use, and their web site has some history of the original. http://www.trailmobile.com/site/epage/43942_638.htm

From the drawing it looks like ballast tanks in the back of the truck might be a solution for Ben. Or, just make the truck a little shorter than original. I doubt that anyone would every guess. It isn't like you will ever park next to another one.

Just let the tyres down a bit :-)

I don't think that it would need to be carbide. I have used ordinary HSS Rotabroach cutters for birds-mouthing thick-walled tubes, so I am pretty sure that one woud have worked here. With that job to do I would have relished the opportunity to realise a long-held ambition to own a mag-base drill. But, failing that, with the guide plate I am sure that a Rotabroach cutter held in a normal drill would have worked. http://www.ebay.co.uk/itm/Rotabroach-Type-Mag-Base-Cutter-Hole-Cutters-Annular-1-50mm-LOC-/262241740348 If there is any likelyhood that you will be wanting to drill in-situ holes in chassis frames on an ongoing basis then I would strongly suggest keeping an eye out for a nice little mag-base drill.

The hardening of aluminium is caused either by work hardening (dislocations in the crystal structure start interfering with each other) or precipitation hardening (https://en.wikipedia.org/wiki/Precipitation_hardening) Softening a precipitaion hardening alloy requires quite complex heat-treatment, and it seems fair to assume that this isn't what we are doing with soap and a blowlamp. Instead the heat allows the atoms to move enough to "repair" dislocations and/or for tangled dislocations to combine into less-tangled ones. At least this is my understanding, I confess that whilst I am a metallurgist, I am a ferrous metallurgist :-)

I don't think that it is "quenching" in the traditional sense of the term in the case of aluminium or copper alloys. There is no phase change, so you can cool in water or not as the mood takes you. The part will stay hot longer and might end up slightly softer if left to cool naturally, but you can handle the workpiece and get on with the job quicker if you cool it.

I don't know how the pricing is derived, but simple parts with no core seem to be about £25 and then it costs more if he has to make a core, and as more iron is used (and more fuel is used to melt the iron). As a guide, the parts here: https://picasaweb.google.com/108164504656404380542/Holbrook#6230479127730875154 Were priced at £10 each for the rectangular strips, £150 for the big hollow box, £100 for the smaller hollow box, £25 for the chain covers (which did have a core) and £20 for the toolpost boss. Not shown is a simple flat plate that was £10.

With aluminium, if you can see a colour, it has already melted. What has worked for me is to scribble over it with marker pen, then heat until the ink loses its colour. This is rather the same idea as the soap, but easier. I don't know if it matters, but I used green pen. First picture here: http://bodgesoc.blogspot.co.uk/search/label/Neracar11%20The%20Eyes%20Have%20It

Once you find a helpful foundry, castings can be moderately easy and rather less expensive than you might guess. I recently spent £350 on 8 cast iron castings weighing about 80kg total. (To patterns I supplied)

When broken down into individual steps it is possible to see how a miraculous result can be achieved from a number of merely impressive sub-steps. Apart from: I can't imagine the skill it takes to file those radii correctly without accidentally gouging other parts. And I consider myself pretty handy with a file.

I suspect that is is one of those things you get when you keep multiplying numbers together 8 per inch x 30 inches of tube x 4 tubes deep x 15 tubes wide x 3 radiators = 43,000... So, I must have over-estimated some numbers, but it's easy to get there.

I can imagine that it would be possible to make a press-punch to make these yourself with a hand press. I also imagine that after the first few thousand £30/1000 would start to look very cheap indeed.

Wow! I had never previously considered the idea of putting myself up for adoption :-)

Oh how I wish that the LFB hadn't specified brass radiators for fire engines....

It might be better to leave it as an "honest repair" with just the steel frame not disguised by aluminium (which is unlikely to be particularly structural, even if welded on)

I assume the plan isn't to pop-rivet the gearbox and braces together, so what is the plan?

I think the place to start is that you always want some tiny float even in the worst case scenario. So work out how far differential thermal expansion could make things go wrong at the melting point of brass, and you need no more than that. I would guess we are talking about 50 thou.

Just tell everyone that it is special Ebonite tape and it is meant to look like that :-)