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                                       Slab and Bracket Construction
     
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1st message | this message only posted: 9 Jan 2018 22:23
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from:
Andrew Barrowman
USA

 

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Are there as many bracket castings as there are crossing angles, or is the bracket and the bolt perpendicular to the wing rail with the holes in the slab drilled to suit a common bracket casting?

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2nd message | this message only posted: 9 Jan 2018 22:38
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from:
Martin Wynne
West Of The Severn, United Kingdom



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Andrew Barrowman wrote: Are there as many bracket castings as there are crossing anglesHi Andy,

Yes, there is a left and right bracket casting for each crossing angle.

I'm just scanning a drawing, will post later.

cheers,

Martin.

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3rd message | this message only posted: 9 Jan 2018 23:15
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from:
Martin Wynne
West Of The Severn, United Kingdom



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Hi Andy,

Here are the scans.

1. REA. Sorry it's scanned from a poor photocopy.

Built-Up "A" Chairs,  C.I. (cast iron) Brackets:



Here's the link for the full-size scan:

 http://85a.co.uk/forum/gallery/2/original/2_091756_280000000.png



2. GWR:



Full-size scan:

 http://85a.co.uk/forum/gallery/2/original/2_091811_010000000.png

I'm sure I have a drawing of the REA slab somewhere but it's not to hand.

It's 1.3/4" thick (the slab, not the drawing). REA.

Or 1.7/8" thick. GWR, as shown on drawing. M.S. = mild steel.

regards,

Martin.

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4th message | this message only posted: 10 Jan 2018 00:31
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from:
Andrew Barrowman
USA

 

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Great! Looks like the bolts are always perpendicular to the center-line of the crossing.

Thanks Martin.

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5th message | this message only posted: 10 Jan 2018 13:27
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from:
David R
Hatfield Heath, United Kingdom



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7mm scale BC7 slab and brackets are available from Off The Rails:

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6th message | this message only posted: 10 Jan 2018 15:52
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from:
Andrew Barrowman
USA

 

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The bolts are perpendicular to the wing rails on that version. Interesting!
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7th message | this message only posted: 10 Jan 2018 16:09
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from:
Martin Wynne
West Of The Severn, United Kingdom



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Andrew Barrowman wrote: The bolts are perpendicular to the wing rails on that version. Interesting!Hi Andy,

???

There is a single through bolt, with spacers between the wing rails and the vee nose (not shown in David's drawing).

So unless you have invented a bolt with a bend in the middle, it can't be square to the rails. :?

Martin.

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8th message | this message only posted: 10 Jan 2018 17:34
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from:
Andrew Barrowman
USA

 

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Bendabolts? :)

Yes, I see what you mean. Looking at David's rendering again it does look as if the bolts are on the same axis. Another clue is that only one end has a nut!

Cheers!
Andy

Martin Wynne wrote: Andrew Barrowman wrote: The bolts are perpendicular to the wing rails on that version. Interesting!Hi Andy,

???

There is a single through bolt, with spacers between the wing rails and the vee nose (not shown in David's drawing).

So unless you have invented a bolt with a bend in the middle, it can't be square to the rails. :?

Martin.


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9th message | this message only posted: 10 Jan 2018 18:22
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from:
Phil O
Plymouth, United Kingdom



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In the share and show part of this forum near the beginning is a series on GW special chairs, each of the topics with a common crossing has a photo of the slab and bracket for that crossing.

Sorry no link as I am currently having internet problems and I can't use my pc and I don't know how to do it on my tablet.

Phil.
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10th message | this message only posted: 10 Jan 2018 18:32
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from:
Martin Wynne
West Of The Severn, United Kingdom



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Phil O wrote: In the share and show part of this forum near the beginning is a series on GW special chairs, each of the topics with a common crossing has a photo of the slab and bracket for that crossing.

Sorry no link as I am currently having internet problems and I can't use my pc and I don't know how to do it on my tablet.
Thanks Phil.

Link to pages here:

 http://85a.co.uk/forum/view_forum.php?id=12&sort_by=&page=5

Martin.

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11th message | this message only posted: 10 Jan 2018 20:34
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from:
Andrew Barrowman
USA

 

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Many thanks Phil and Martin.
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12th message | this message only posted: 10 Jan 2018 20:56
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from:
Andrew Barrowman
USA

 

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Almost done! CCL next.




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13th message | this message only posted: 11 Jan 2018 13:47
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from:
richard_t
Nr. Spalding, South Holland, United Kingdom



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Probably a bit late to the party, but here's a photo of a slab an bracket chair, taken at Crewe Gresty Lane, during a DRS open day.

I hope it helps.


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14th message | this message only posted: 11 Jan 2018 14:37
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from:
Martin Wynne
West Of The Severn, United Kingdom



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Thanks Richard.

Andy, that's an LMS slab & bracket (REA design).

Phil's photo was of a GWR slab & bracket.

Martin.

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15th message | this message only posted: 13 Jan 2018 12:35
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rodney_hills
United Kingdom

 

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Hello,
Some info here:
http://www.westernthunder.co.uk/index.php?threads/gwr-switch-crossing-never-too-old-to-learn.5750/

"C&L slab and bracket alternative is too modern for a 19th century BLT."

Some more here:
https://www.scalefour.org/forum/viewtopic.php?t=1488#p10885

[highlight= rgb(255, 255, 238);]"Heres another shot of an E S R retimbering job which shows G W R slab and bracket components being used in a slip environment, note this is held down with the A S chair screws I mentioned earlier."

And finally: 
(referenced before in other topics):
http://www.norgrove.me.uk/permanent_way_notes.htm
Permanent Way Notes,  Civil Engineer's Office, Paddington

especially 2298, 2299 and 1736

Regards,
Rodney Hills






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16th message | this message only posted: 13 Jan 2018 22:55
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from:
Andrew Barrowman
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Thanks very much Rodney.
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17th message | this message only posted: 14 Jan 2018 10:08
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from:
Phil O
Plymouth, United Kingdom



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Here is a link to my GW special chairs,

http://85a.co.uk/forum/view_topic.php?id=187&forum_id=12

 which includes the Z chair mentioned here http://www.westernthunder.co.uk/index.php?threads/gwr-switch-crossing-never-too-old-to-learn.5750/

The dxf file has the plan view for the chairs drawn at full size.

http://85a.co.uk/forum/view_forum.php?id=12&sort_by=&page=5

On this page are similar for all the various forms of S & C on the ESR, in the same format with the chair footprint drawing at full size plus a photo of each type of chair.


Phil

EDIT: I forgot the links

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18th message | this message only posted: 15 Jan 2018 18:30
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from:
Andrew Barrowman
USA

 

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Thanks for that Phil.

A minor defugalty has arisen:



This is part of a 7.5 4-SF single slip. As you can see the first P chair is clonking into the L1 chair.

How might this be handled on the real thing?

I could;

1) Ignore it and hope nobody notices (it would print as shown.)

2) Shorten the P chair

3) Bolt on a half chair instead of the L1

4) Other ideas??

BTW, only the inner faces of the rails are shown on the template. All the chair components are referenced to that edge of the rail.

Don't be alarmed by the apparent lack of space in the jaws to accommodate the rail. When the rail is positioned in the model it automatically merges together with the chair models. In fact the position of the chairs is not very critical. The most important thing is to ensure that the rail model follows the rail in the template imported from Templot.

Turbocad has a "sweep" function that creates the rail model by sweeping a profile along the line on the template with a single click of the mouse. Thereafter the precise position of the rail is determined purely by the accuracy of the 3D printing process. No more messing about trying to adjust the rail position :D

Andy

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19th message | this message only posted: 15 Jan 2018 19:20
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from:
Martin Wynne
West Of The Severn, United Kingdom



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Andrew Barrowman wrote:As you can see the first P chair is clonking into the L1 chair.

How might this be handled on the real thing?
Hi Andy,

It depends which specific prototype you are modelling? Finding one matching 16.2mm gauge is a bit of a challenge. :)

On the GWR it is an angled bolted half chair instead of the L1. Here's Phil's pic of one:




The REA design uses an M1 chair instead of the L1, and an SP chair instead of P.

M1 is a smaller version of L1 -- 8.3/4" long instead of 10.1/2". Do you want a scan?

Sorry I don't have a drawing of SP, still looking. It's obviously shorter than a P.

cheers,

Martin.   


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20th message | this message only posted: 15 Jan 2018 19:43
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from:
Andrew Barrowman
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Thanks Martin.

I have the M1 dimensions. Just need to create the model. I'll need it in other places anyway. I would imagine the SP is just a bit shorter. That wouldn't be difficult.

The prototype is slightly uncertain :) Probably BR Scottish Region. The three hole S1's probably exclude the GWR.

Regards,

Andy
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21st message | this message only posted: 16 Jan 2018 05:42
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from:
Andrew Barrowman
USA

 

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Another one :)

Because of the overscale flangeways, the load bearing "vee's" in the K-crossings (is that the correct term?) in my single slip are barely supported on timbers. I could re-position the timbers to support the vee's properly, but the timber pitch will probably be out of spec and it's going to look a bit weird.

I suspect this is where we have to use a bit of modelers license and fudge the vee support, but I'm open to suggestions.
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from:
Martin Wynne
West Of The Severn, United Kingdom



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Andrew Barrowman wrote: Because of the overscale flangeways, the load bearing "vee's" in the K-crossings (is that the correct term?) in my single slip are barely supported on timbers. I could re-position the timbers to support the vee's properly, but the timber pitch will probably be out of spec and it's going to look a bit weird.Hi Andy,

You mean the K-crossing point rails.

There is already an option in Templot for that:





regards,

Martin.

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Andrew Barrowman
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Great! Thanks Martin.

Andy
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