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topic: 3251S&C Chairing diagram/descriptions
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posted: 1 Apr 2018 01:17

from:

Rob Manchester
 
Manchester - United Kingdom

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Hi Martin,

Am I dreaming or was there a page on the Companion showing chair names and positions on bullhead S&C work? BRT ( blue 1956 ed. ) pages 87 and 92 gives details but your colour diagrams are always so well drawn and much better to explain to people.

Thanks
Rob


posted: 1 Apr 2018 10:46

from:

Martin Wynne
 
West Of The Severn - United Kingdom

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Rob Manchester wrote:
Am I dreaming or was there a page on the Companion showing chair names and positions on bullhead S&C work? BRT ( blue 1956 ed. ) pages 87 and 92 gives details but your colour diagrams are always so well drawn and much better to explain to people.
Hi Rob,

I can't remember a specific page, but I have at times coloured in Len Newman's template drawings for Exactoscale, e.g.

chairing_patterns.gifchairing_patterns.gif

 topic 780 - message 4620

There has also been some discussion in Andy's 3D printing topic:

  topic 2734 - message 19837

What specific information are you looking for?

There is a PDF of the Paddington drawings of the standard REA chairs at:

 http://www.scalefour.org/downloads/gwrtracknotes/R4290A.pdf

cheers,

Martin.

posted: 1 Apr 2018 11:18

from:

Martin Wynne
 
West Of The Severn - United Kingdom

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p.s. Rob,

Back in version 214 I did start on an experimental function to add chair outlines to the templates:

2_010608_040000000.png2_010608_040000000.png

2_010608_040000001.png2_010608_040000001.png

I may pick it up again one day. It's an utter minefield because of so many prototype variations. Even on the above I can see something questionable. It could only ever be for the most bog-standard basic REA turnouts, and I just know that it would lead to endless questions and discussions. Obviously you would need to print two of everything, because the details get covered up once the timbers are fixed in place.

Martin.

posted: 1 Apr 2018 22:39

from:

Rob Manchester
 
Manchester - United Kingdom

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Hi Martin,

Thanks for the info. The reason for asking yesterday was because I saw Phil/C&L at York show and purchased some packs of common and obtuse crossing chairs for a guy who lives near me. Like these :-

C&L Common crossing chairs

and

C&L Obtuse crossing chairs

I dropped them off with him on the way home last night and two hours later he was emailing me asking what all the markings on the sprues meant :( I admit to always using cut up standard chairs on my S&C work to date so I looked around for something to placate him.

The Exactoscale template link on the topic you mentioned doesn't work ( of course ) and there are no examples on Phil's current site. I have a complete set of templates from the days before I discovered Templot but they are the more simplified C&L ones rather than Len Lewman's detailed ones.

Don't bother too much about it - I chatted to him this afternoon and I think he can sus it out now.

Rob



posted: 1 Apr 2018 22:55

from:

Martin Wynne
 
West Of The Severn - United Kingdom

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Hi Rob,

Download PDFs explaining the Exactoscale chairs and numbering here:

 http://www.finescale.org.uk/index.php?route=information/information&information_id=36

More info:

 http://www.finescale.org.uk/index.php?route=information/information&information_id=18

cheers,

Martin.

posted: 1 Apr 2018 23:02

from:

Rob Manchester
 
Manchester - United Kingdom

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Hi Martin,

Sorry, Have to hold my hand up and confess to not even looking on the C&L site :(

Thanks as always.

Rob


posted: 1 Apr 2018 23:41

from:

Andrew Barrowman
 
USA

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Not sure how C&L designate the chairs, but it might be something like this:

2983_011837_050000000.jpg2983_011837_050000000.jpg
2983_011837_050000001.jpg2983_011837_050000001.jpg


posted: 2 Apr 2018 00:15

from:

Rob Manchester
 
Manchester - United Kingdom

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Thanks Andy, That is helpful.

Rob


posted: 5 Apr 2018 08:51

from:

David R
 
Hatfield Heath - United Kingdom

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Martin Wynne wrote:
Hi Rob,

Download PDFs explaining the Exactoscale chairs and numbering here:

 http://www.finescale.org.uk/index.php?route=information/information&information_id=36

More info:

 http://www.finescale.org.uk/index.php?route=information/information&information_id=18

cheers,

Martin.
There is also some prototype information on the Off The Rails website.

Dave R

posted: 5 Apr 2018 12:16

from:

Rob Manchester
 
Manchester - United Kingdom

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David R wrote:
There is also some prototype information on the Off The Rails website.

Dave R
Hello Dave,

Thanks for the info. I was thinking that the omission of special chairs from the C&L 7mm range was a nuisance but you will be able to fill in the gaps and save me chopping up standard chairs. I have started using the Exactoscale branded chairs rather than the C&L branded ones as the mouldings appear crisper to my eyes and they don't suffer the issue of sometimes sitting at a slight angle to the rails. Are your chairs a good match for these when painted and installed ? Does Butanone stick your chairs in the same was as the 'other' brands do to timber sleepers?

Regards
Rob


posted: 5 Apr 2018 14:09

from:

David R
 
Hatfield Heath - United Kingdom

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Rob Manchester wrote:
I have started using the Exactoscale branded chairs rather than the C&L branded ones as the mouldings appear crisper to my eyes and they don't suffer the issue of sometimes sitting at a slight angle to the rails. Are your chairs a good match for these when painted and installed ? Does Butanone stick your chairs in the same was as the 'other' brands do to timber sleepers?
The Off The Rails chairs are a good match for the Exactoscale products as we both based our designs upon the same prototypes!

Almost all Off The Rails products are 3D-printed in Shapeways' FUD material that is an acrylic which is not affected by solvents like Butanone, MEK or Mek-Pak.  I use a runny "superglue" dispensed in tiny amounts from a syringe through a 0.3mm i.d. needle to assemble these products; the miniscule amounts of glue sometimes allows for the joint to be broken if adjustments are required.  Otherwise the FUD chair breaks and either needs repair or replacement.

A picture to whet your appetites:
100_181516_560000000.jpg100_181516_560000000.jpg

...before I sort out the announcement of over 50 new switch chairs to the REA A, B C and D designs.  The A switch is available now; the others are awaiting test prints, test builds and (hopefully not too many) changes before being made available.  And then there will be instructions to write...

After which we'll start on the full range of acute crossings, obtuse crossings, diamonds and slips (the M1 chair required for the latter is available now).

Dave R
Last edited on 5 Apr 2018 14:13 by David R
posted: 5 Apr 2018 19:22

from:

Rob Manchester
 
Manchester - United Kingdom

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Hello Dave,
Thanks for posting the pic and details of the 7mm scale chairs. Is there a timescale for the introduction of common crossing sets in 1:5 or are you just doing the 1:6 for now ? Not too worried about the only switch sets being an 'A' type - the space I have available isn't the biggest and the stock I will be using is only short wheelbase.

Look out for an order from me soon.

Rob


posted: 6 Apr 2018 14:17

from:

David R
 
Hatfield Heath - United Kingdom

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Hi Rob,

The 1:6 was an initial trial which showed that:
  1. 3d-printing the keys in place made it almost impossible to assemble (everything since has had separately inserted keys).
  2. The drawing package that I was using was struggling (or maybe it was me?) so something more 3D oriented was obtained and learned.  This has (eventually) sped up the whole drawing process.
  3. Anything other than scale (i.e. ScaleSeven) representations of the chairs would require designing them from scratch rather than "just" copying the prototype.  
They can be used non-functionally as cosmetic additions for non-S7 turnouts and, as such, the 1:6 will probably be suitable for 1:5 with minimum modifications.  Just be aware that the acrylic FUD material is brittle and it is very easy the get the chairs to change from 3D-prints into 3D-jigsaws in an instant; assuming you can find all of the pieces.  Whilst a sharp scalpel can be used to pare away small amounts of excess material I would recommend a fine saw for the major cuts and files for subsequent cleaning up.
I try not to give timescales since life has a habit of getting in the way!  The 1:12 common crossing chairs will be the next to be done as they're needed for Love Lane which will be appearing at the NEC in November -- a timescale and a deadline!  These will then form the basis of the other common crossings ("just change a couple of dimensions" said one of the team!).

In reality the A switch has taken nearly 18 months and the B, C & D just 4 months so I am getting faster!

Dave R
Last edited on 6 Apr 2018 14:19 by David R
posted: 6 Apr 2018 20:03

from:

Rob Manchester
 
Manchester - United Kingdom

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Hello Dave,
Thanks for the reply re the 3-D chairs. I assume that orders placed from the UK are shipped from Holland and not the US so won't attract any import duties etc.

I will probably go with building around the 1:6 angle for the crossings and use a straight 9 foot switch rather than an 'A' ( still using your 'A' parts ) as it will ease the radius a bit.

Thanks agin.
Rob


posted: 19 Apr 2018 08:54

from:

Hayfield
 
United Kingdom

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I have a set of A switch chairs and some check rail chairs in the post at this moment, due to be delivered tomorrow.

Will up load a photo when recieved

posted: 19 Apr 2018 12:45

from:

Rob Manchester
 
Manchester - United Kingdom

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Hi John,

I have some chairs on the way from Shapeways too, due Friday. They are probably keeping yours company on the plane :D I just ordered some 1.5mm check chairs so see what the print quality is like before maybe splashing out on others.

Rob




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