LMS Patriot Project Updates

Excellent news again! This project really is coming on in huge leaps and bounds, I must see if I can increase my monthly standing order amout. It may be a drop in the ocean, but every little counts, to coin a phrase...

Richard.

 

In that case how are such galleries machined into the pattern? Are they machined as "cut and cover" sections?

 

Ah, thanks.

I assume it's there to project fragile (it is, after all, just foam) corners, etc? Or does it have some other role as well?

Noel

 

Although i'm not 100% on this, I am fairly sure that upon placing the poly pattern in the core box, the sand-resin is added and then vibrated, so as to fill every space (acting in effect as cores) then the sand-resin is cured to become solid, the metal can then be poured and takes the place of the poly.
Hope this helps
Andy

 

Richard Roper that would be fantastic if you could! Every little does indeed add up, to actually quite a large amount!. Thankyou

And as Andalfi1 says! haha

Just had a nice meeting with Privateer brewerys who start our ale next week!! So look out to see if this will be at a Pub near you!

Just to remind anyone who is at Either Severn valley (kiddy station) or Crewe Hc as were at both these events this weekend.

kind regards Gavin

 

For a grey iron casting that is essentially correct.

 

If you watch 'Family Guy' you will see that the Pawtucket Brewery already produces 'Patriot' ale !

Bob.

 

A post like that is almost asking for a follow-up... (In this case, along two axes!)

Noel

 

b.oldford said: ↑

For a grey iron casting that is essentially correct.​

It does indeed. However I fear in depth discussions here might be a diversion from the real thrust of this thread . That being the progress of 45550.

Any in depth discussion on the casting process should in reality be generic because it may be applicable to all manner of components; not just locos. If such a discussion were to be appropriate on this particular forum I would suggest a better place might be the MIC area.

 

Agreed.......but another aspect occurred to me as well...with it being machined on a CNC machine you can easily compensate for the cooling casting contraction when producing the pattern.....none of the expansion ruler business like my late dad used.....he was a pattern maker.....I still have his rulers.....

 

If only contraction was as uniform as theory would suggest. The bigger the item the less uniform it gets. See http://rasalmon.co.uk/bluebell/download/locos/TheBluebellStandard16a.pdf for a f'rinstance.

Even more for an MIC maybe.

 

Absolutely, as I have seen with large machine tool castings and resultant distortion....

 

What I think you're getting at here is not how the mould is made (which has been amply answered) but how the pattern itself is made. There's an excellent series of photos of the inside cylinder pattern showing CAD model to pattern segments to assembled pattern: http://lms-patriot.org.uk/news/2013-03-28/cylinder-appeal-launched-‘-unknown-warrior’
It's essentially "cut and cover".

 

.... which sort of makes me wonder how it is possible to be sure that the moulding sand has entered all these crevices satisfactorily. I'm not stirring or being awkward, just curious!

 

I am sure that someone with detailed knowledge will be along to confirm the actual process. I have seen processes where a complex sacrificial pattern was dipped in a ceramic type liquid which covered all surfaces, this was backed up with a type of resin sand slurry which supported the thin ceramic layer, once the mould had set and dried the metal was poured in the normal way vaporising the poly pattern. This was on complex engine cylinder blocks.

 

Hi Gav, having just read the spoof April fool on Facebook, I would be interested to know if a high sided Fowler tender has ever been considered for 5551 ? I haven't seen anything on the site, or the forum to indicate if it has, but for main line use, with the extra capacity, I would be surprised if it hadn't, could you clarify please ?
Thanks
Andy

 

Hi Andy. I know it has been discussed in the past, but to what extent i dont know. I do know that some of the directors dont like the look of the fowler high sided tender. And i also know that it was mentioned that there isnt actually much extra capacity in comparison to the normal fowler tender (although i cant confirm, hopefully someone on here can help with info on the tenders)

I personally dont mind either tender and would be happy with which ever is best for use. Maybe we could build a second tender once complete and then build a fowler 2P to go infront eventually (that is a joke, unless someone has a cheque)

Obviously i cant comment on behalf of the project but the response from the facebook page was actually quite good! Maybe if enough members were interested and sent emails it could become a topic of conversation for a board meeting.

Gav

 

Thanks for that, only my opinion, but for the sake of running on the modern network, we should forsake the aesthetics and go for the larger tank with modified coal space and increased water capacity, even if for just making life easier planning railtours (or should I start saving my 2p's for a 2P and a REG ?)
Andy

 

From memory, the high sided tenders (which were ugly buggers!) had the same 3,500 gallon water capacity but could take seven tons of coal against 5 1/2 for the standard type.