Author Topic: B&SR no. 8 arrives at Sheepscot  (Read 3618 times)

John McNamara

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Re: B&SR no. 8 arrives at Sheepscot
« Reply #15 on: December 16, 2019, 03:13:16 PM »
Now we know that the turntable will handle 38 tons.....once. ;)

Kevin Kierstead

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Re: B&SR no. 8 arrives at Sheepscot
« Reply #16 on: December 16, 2019, 06:58:13 PM »
what is the rated tonnage for the turntable?
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Rick Rowlands

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Re: B&SR no. 8 arrives at Sheepscot
« Reply #17 on: December 17, 2019, 05:09:51 PM »
38 tons?
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Jeff Schumaker

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Re: B&SR no. 8 arrives at Sheepscot
« Reply #18 on: December 18, 2019, 08:50:04 AM »
Didn't  WW&F #6 get turned on the original turntable at Wiscasset?

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Graham Buxton

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Re: B&SR no. 8 arrives at Sheepscot
« Reply #19 on: December 18, 2019, 09:03:03 AM »
Harold Downey drew up the plans used to construct the current WW&F turntable. Here are his comments on weight ...

Overall, this turntable bridge is a very robust structure.  The stresses in all the main elements are very low.  The primary limiting factor was deflection, which was governed by the longitudinal beams.  The truss elements function to keep the loads on the perimeter rail and wheels near zero once the locomotive is centered.  In fact if you look at some of the historical photos, there is only a partial perimeter rail. 
Finally, the bridge would still function without the truss, but it would be harder to turn.

For the stress analysis, I used the biggest WW&F locomotive as the design load --the 26 ton #6. 

It was quite fun to look at the historical photos and analyze the changes from the Portland Co. drawing.  Folks have noticed the tie rod between the queen posts so far.  There are quite a few other differences, some of them subtle.  Our turntable will be very much like the historical photos.

That quote was posted early in  the "Official Turntable Work thread" started several years ago. Here is a link to the beginning of that thread:
http://forum.wwfry.org/index.php/topic,2628.0.html
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Philip Marshall

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Re: B&SR no. 8 arrives at Sheepscot
« Reply #20 on: December 18, 2019, 01:11:28 PM »
I had assumed the 26-ton weight for No. 6 was the engine only, not counting the tender. Is this incorrect?

Benjamin Richards

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Re: B&SR no. 8 arrives at Sheepscot
« Reply #21 on: December 18, 2019, 08:35:59 PM »
No, you are correct; that figure is for the engine only. A fully-loaded tender would add roughly half as much again.