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| kwackers:
Funny isn't it? I've never really thought about castings before - just got on and machined them. It just seems to make sense that you need to extract the finished product 'out' of the casting so you make sure you can! Mind you a fair chunk of the machining I've done over the years is from castings so perhaps I'm just used to them. I have had a few failures though! :bugeye: |
| Bogstandard:
Kwackers, A few casting suppliers nowadays seem to be using old castings as their pattern, rather than the corrected size patterns. This means that after metal shrinkage has occurred, the castings are in fact sometimes undersized. So the first thing you must do is check that the bit you want to make will actually be able to come out of that casting. I don't know whether this is true of Stuart Turner, but a few people I know are complaining that after getting their datum points set, there is not enough metal left to put the fixings in. So then you have to resort to fiddling with dimensions, not just on the part you are making, but on the mating parts as well. That is why you should check all your castings first, and mark up your start points. Bogs |
| NickG:
That would be really annoying as the only reasons I can see for buying something made from castings is so there's less work to do i.e. less material to machine away and so it looks top notch and more representative of the real thing, but if you have to start fiddling things it defeats the point of trying to build a recognised off shelf design and could compromise the overall look. Does anybody know a supplier of really good quality casting / material kits? Nick |
| raynerd:
Just to remind you that these Stuarts look very good! it was my error!!! Chris |
| Bogstandard:
Sorry to slightly hijack, but just to answer Nick's question. My next two kits that I have already bought are from Bruce Engineering. They are very good quality and have plenty of spare meat on them. http://www.homemodelenginemachinist.com/index.php?topic=9233.0 They do some really nice out of the ordinary engines from the Anthony Mount stable. They really are outstanding engines, but not for the total beginner. You will need to download their large catalogue from here. http://www.pollymodelengineering.co.uk/sections/bruce-engineering/price-list.asp Bogs |
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