LMS Patriot Project -The National Memorial Locomotive

[Deleted]

Hello ROSS--------grab your night-time Horlicks, relax in your comfy armchair and have a look at these >>>>>>>>>>>>>>>>>>>> en.wikipedia.org/wiki/Sand_casting -------- en.wikipedia.org/wiki/Molding_sand -------------

[suctionhose]

Aug 28, 2014 22:20:45 GMT @4930hagley said:

Hello ROSS--------grab your night-time Horlicks, relax in your comfy armchair and have a look at these >>>>>>>>>>>>>>>>>>>> en.wikipedia.org/wiki/Sand_casting -------- en.wikipedia.org/wiki/Molding_sand -------------

Thank you Alan. That's the basics that every house husband should know!!? I'm talking about moulding the passages really. Say for example the connecting passage from steam chest to bore.

Traditionally these would be formed with cores made separately in core boxes. The cores would be set with resin or something so they would be quite firm and not break off when being handled.

I was wondering in the case of using a poly pattern whether ordinary foundry sand could be rammed up to form long, slim sections or whether a different sand / resin was needed for the passages or whether a combination of materials would be used for different features of the mould.

A was going to post a picture of a core and core box for a traction engine cylinder but I can't get your favourite Tiny Pics to work today.... I'll try later

[suctionhose]

Actually rather than hijack here see new thread "poly patterns"

[jordanleeds]

It is a normal black foundry sand that they used with the passages packed in place, as it is not a traditional mould the pattern is left in place to be burnt out by the pour

[suctionhose]

Thank you for commenting...

[jordanleeds]

Does that give you the information you where looking for? or do i need to seek further clarification for you from those who did the design work?

[suctionhose]

Well, I'm probably reading more into it than it deserves. It's ok - I do that sometimes, knowing full well that what happens at the coal face is rarely as straight forward as the discussion in the office!
I would love to be hands on with a job like that to really get the feel of what is required. As that is unlikely I will have to be satisfied with the pictures and the odd question.
Good job for putting the thread up - these new builds are really inspiring!