I am trying to plan for a roundhouse/turntable on my condo layout. I am looking at the walthers 90ft and the matching roundhouse. How much space is there between the Turntable and the roundhouse. My calculations show about a foot between, but that seems extreme. How much space should I plan for?
JJF
Prototypically modeling the Great Northern in Minnesota with just a hint of freelancing.
Yesterday is History.
Tomorrow is a Mystery.
But today is a Gift, that is why it is called the Present.
I don't know if this matters, but it will only be 3 stalls.
It is 15cm.
I printed off this template from the Walthers website and made up a paper RH/TT template and glued it to a piece of cardboard so I could move it around to find the best fit.
Brent
"All of the world's problems are the result of the difference between how we think and how the world works."
BATMAN It is 15cm. I printed off this template from the Walthers website and made up a paper RH/TT template and glued it to a piece of cardboard so I could move it around to find the best fit.
Thanks. I'll plan for 6 inch's (15cm).
I have the same turntable (90') and the same roundhouse, although I bought 2 RH to give me 6 stalls. Using a metal straightedge after I put the roundhouse halves together, I found that the lines centered thru all 6 bays converged at a point in the center of the turntable that left me with 6" between the edge of the turntable and the front edge of the roundhouse.
Andy
--------------------------------------------------------------------------------------------
Milwaukee native modeling the Milwaukee Road in 1950's Milwaukee.
https://www.flickr.com/photos/196857529@N03/
LastspikemikeThe resulting distance has nothing to do with the size of the turntable.
Yes it does.
JDawgI am trying to plan for a roundhouse/turntable on my condo layout. I am looking at the walthers 90ft and the matching roundhouse.
It was either Ed or Byron that had an excellent graphic showing the distance from the different turntables to the doors on the Walthers Modern Roundhouse, which I believe is 15 degrees between stalls.
I thought I had captured the image, but I guess I didn't.
Hopefully one of them can chime in with the right answer.
-Kevin
Living the dream.
Lastspikemike The resulting distance has nothing to do with the size of the turntable. ...
The resulting distance has nothing to do with the size of the turntable.
...
Think this through. Suppose you have everything as you envision it should be, but instead of a turntable you have a walnut where the bay rails converge. Would the walnut's comparatively smaller size than our 90'er make the bay extensions to the edge of the walnut shell longer or about the same?
SeeYou190It was either Ed or Byron that had an excellent graphic showing the distance from the different turntables to the doors on the Walthers Modern Roundhouse
Yes, I do:
Pit_to_doorRH by Edmund, on Flickr
130 foot turntable.
However, I believe, as often happens, the replies are getting muddied by misunderstandings.
I believe Alyth Yard is refering to the TT center point, not so much the distance from the pit wall to the front roundhouse wall.
Laser_RRtt by Edmund, on Flickr
My former roundhouse at this location was the old Heljan kit. The front WALL of the roundhouse is set back from the pit wall a bit farther. This only results in a greater distance between the door openings.
Roundhouse4 by Edmund, on Flickr
Both the Heljan and the Walthers Modern used 10° stall centers*.
*(± .0005°)
History:
http://cs.trains.com/mrr/f/11/t/271752.aspx
Good Luck, Ed
So, with the 90 foot table what should I figure for? the walthers site lists 11 and 15/16, which seems like a lot. 6in seems reasonable, but now I'm not sure.
I have 30cm from RH wall to the centre of the 90' pit.
I lined up the RH floor and TT and then built the rest of the RH. I made it movable so I could work at the desk and it would be easy to pack up as a unit if I move.
I would move it back and forth.
When I was finally finished, I left it in place and taped up the cracks and put down the ground cover.
The 11 15/16 dimension is from the center of the turntable to the doors, not from the edge of the turntable.
Mark P.
Website: http://www.thecbandqinwyoming.comVideos: https://www.youtube.com/user/mabrunton
Pruitt The 11 15/16 dimension is from the center of the turntable to the doors, not from the edge of the turntable.
That makes much more sense! Thanks You! Now I feel sort of silly for not thinking of that.
JDawg Pruitt The 11 15/16 dimension is from the center of the turntable to the doors, not from the edge of the turntable. That makes much more sense! Thanks You! Now I feel sort of silly for not thinking of that.
The 90 foot turntable bridge will be about 13" long, or 6 1/2" to center.
That should give you about 5 1/2" of track between the turntable and the roundhouse (if my math is OK).
I only got a B+ in Math 12 and high school is as far as I got. If I can get things lined up properly anyone can.
The biggest surprise from this electronically challenged person was when I wired it up and plugged it in for the first time, it worked perfectly.
JDawgHow much space should I plan for?
Overmodanother is that the centerline of the leads lines up with the centerline of the stalls
If your leads line up with a stall you can straight shot a loco that is too big for the TT straight across the TT into a stall like I do here with engine 2004.
For what its worth I have a HO scale Korber Roundhouse and a CMR 135’ Turntable. I modified/kitbashed the roundhouse so it would hold my long Southern Pacific Articulateds.The roundhouse was 7½° stall spacing from Korber, I moved the rear sections back 4½” making the tracks about 7â…œ°.Mel My Model Railroad http://melvineperry.blogspot.com/ Bakersfield, California I'm beginning to realize that aging is not for wimps.
We had a discussion of this issue a couple of years ago regarding the placement of my Walthers Cornerstone Modern Roundhouse relative to the Walthers Cornerstone 130' turntable. Ed (7j43k) posted a formula in that thread which proved to be totally accurate. Here is that formula:
richhotrain Ed, any chance you can publish that formula for all of us to reference. Rich ((b X c) / (a - b)) - d a = one half of width of rear wall of one stall b = one half of width of front wall of one stall c = distance from rear wall to front wall (NOT length of roundhouse wall) d = radius of pit Ed
Ed, any chance you can publish that formula for all of us to reference.
Rich
((b X c) / (a - b)) - d
a = one half of width of rear wall of one stall
b = one half of width of front wall of one stall
c = distance from rear wall to front wall (NOT length of roundhouse wall)
d = radius of pit
Ed
Edit Notes: The stall width is exactly 2" front, and 5" rear. The stall length is 17 5/8". The diameter of the pit is 13 3/16".
Alton Junction
richhotrainWe had a discussion of this issue a couple of years ago regarding the placement of my Walthers Cornerstone Modern Roundhouse relative to the Walthers Cornerstone 130' turntable.
I put a link to that discussion in my above reply. It is up to the reader to click the link and access the valuable information.
Regards, Ed
gmpullman richhotrain We had a discussion of this issue a couple of years ago regarding the placement of my Walthers Cornerstone Modern Roundhouse relative to the Walthers Cornerstone 130' turntable. I put a link to that discussion in my above reply. It is up to the reader to click the link and access the valuable information. Regards, Ed
richhotrain We had a discussion of this issue a couple of years ago regarding the placement of my Walthers Cornerstone Modern Roundhouse relative to the Walthers Cornerstone 130' turntable.
gmpullman It is up to the reader to click the link and access the valuable information.
It is very valuable information.
I saved it this time!
Well, this is a lot of discussion for something so simple. The instructions I read were if you were using a **** size turntable install RH tracks so they stick out **** inches from the front edge of the roundhouse floor. That is what I did and the fit was perfect.
BATMAN Well, this is a lot of discussion for something so simple. The instructions I read were if you were using a **** size turntable install RH tracks so they stick out **** inches from the front edge of the roundhouse floor. That is what I did and the fit was perfect.
Edit Note: I dug up my instruction sheet and the turntable template. There is no mention of the distance.
Lastspikemike The resulting distance has nothing to do with the size of the turntable. The smaller the turntable the longer the tracks will be.
The smaller the turntable the longer the tracks will be.
I am pretty sure it was the RH instructions that gave that but I no longer have them. I could be wrong and it may have been somewhere else I read it other than the instructions, but I don't think so.
BATMAN I am pretty sure it was the RH instructions that gave that but I no longer have them. I could be wrong and it may have been somewhere else I read it other than the instructions, but I don't think so.
richhotrainThat would surprise me if the roundhouse instructions specified the distance because the radius of the turntable is part of the forumula, so the rounhouse specs would have to account for different size turntables such as 130', 110', 90', etc. Rich
As I said in my first post.
BATMAN richhotrain That would surprise me if the roundhouse instructions specified the distance because the radius of the turntable is part of the forumula, so the rounhouse specs would have to account for different size turntables such as 130', 110', 90', etc. As I said in my first post. BATMAN Well, this is a lot of discussion for something so simple. The instructions I read were if you were using a **** size turntable install RH tracks so they stick out **** inches from the front edge of the roundhouse floor. That is what I did and the fit was perfect.
richhotrain That would surprise me if the roundhouse instructions specified the distance because the radius of the turntable is part of the forumula, so the rounhouse specs would have to account for different size turntables such as 130', 110', 90', etc.
You can't find the instructions that you read and you don't know where to find them. I looked at my instructions and template and there is no reference to distance specs.
So, apparently, it is not so simple.
But it doesn't matter because once I printed Ed's formula from my older thread, an exact distance was finally provided to the OP.
Now to muddy the waters.If the distance from the roundhouse to the turntable is long enough, you will get the tracks overlapping and there will be frogs in the approach tracks. Ashland, WI on the NP was one example of such, and there are others.
Disclaimer: This post may contain humor, sarcasm, and/or flatulence.
Michael Mornard
Bringing the North Woods to South Dakota!