Rich
I could make you a CAD drawing if you Post or send me the stall width measured at the doors.
EDIT:
Include the stall depth too.
Mel
My Model Railroad
http://melvineperry.blogspot.com/
Bakersfield, California
I’m beginning to realize that aging is not for
Keep in mind that a turntable and roundhouse kit from the same manufacturer may be set up so the edge of the turntable pit and the apron of the roundhouse come together without needing to do any calculations to line up the roundhouse tracks and the turntable. Not sure about Walthers, but I know that’s how the Atlas RH/TT set up works.
If you’re willing to curve the tracks, then the distance can vary. There have been railroads (such as the V&T) that used square “roundhouses” and curved the tracks coming off the turntable.
Paul
This has been a very interesting thread. A similar thread:
http://cs.trains.com/mrr/f/88/t/114871.aspx
Here is one quote from the above thread :
“I sent the 2 7/8 measurment to Walthers and I just got an email saying that is correct.”
Simon
ALL? Right.
Anyway:
((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
This is what I came up with digging around using Walthers Roundhouse.
Click to enlarge
The drawing should be pretty close. The Walthers info is pretty vague .
Mel
My Model Railroad
http://melvineperry.blogspot.com/
Bakersfield, California
I’m beginning to realize that aging is not for wimps.
I believe that the distance to the pit in the above drawing (2.5986) should be 2.7966. Assuming all the other dimensions are accurate.
Ed
You could be correct Ed. I could post my drawing on my Google drive so it can be downloaded. All the measurements are from the program not me and a calculator. I didn’t do any rounding and used what Walthers Footprint dimensions I could find with Google Search. The stall door opening dimension came from the program using the 17.75” depth which I missed at 17.7892” and didn’t correct it.
https://drive.google.com/file/d/1K8IayX-jTAzACGUfpXTph48Tb6Q8bsl5/view?usp=sharing
Mel
My Model Railroad
http://melvineperry.blogspot.com/
Bakersfield, California
I’ve got a Korber roundhouse, with five stalls, and the Walthers 90’ turntable. The front wall of the roundhouse is 9" from the inner edge of the turntable pit for the two outermost stalls, and about 9.125" for the three inner stalls.
The roundhouse isn’t yet permanently installed, but the positions of the house tracks at the turntable can be easily adjusted.
I’ve motorised the turntable using the motor and gearbox from a scanner, and am running it with a surplus SCR throttle, powered by a 9VAC wall-wart.
Indexing is “by-eye”, so any variations in the positioning of the house tracks at the pit shouldn’t be an issue…
Wayne
Wayne, the Korber roundhouse is a very nice kit and was very easy to extend to accommodate my long articulateds. I bought a second 104 kit and chopped up the walls to extend the depth from 15” to 19”. The added end wall sections had to have slightly smaller windows from the slopping roof.
I’m still working on the automated doors I have one installed and working using a SG90 servo. This is the second door.
It’s a slow task installing the doors, I can’t crawl because of bad knees so it has to be done laying on my back for hours at a time.
I have only lined up one roundhouse with a turntable in all my layout building experience. It was in N scale for a friend’s N&W layout.
First we figured out where the turntable center would be.
The roundhouse stalls were 12 degrees I believe. We drew a bunch of lines at 12 degree seperations from the turntable center.
Then we mounted the turntable in the correct spot using yellow string to get the center correct. This was before lasers for homeowners.
Then we mounted the roundhouse so all the track center lines were on the lines we drew previously.
We had 100% success with no math.
-Kevin
I had 100% success WITH math.
And it only took about 3 minutes. For one person. Without a roundhouse or turntable.
Ed
Your photo of the Korber roundhouse looks great, Mel!
I could have sent you some wall sections for lengthening the stalls, as I shortened four of mine by 1 1/2 panels, and shortened the other one down to just two panels. The longest loco using the roundhouse is a Bachmann USRA Light Mountain, which fits easily in the longer stalls, while I have some Moguls and Ten Wheelers that can use the short stall…
I put the roundhouse together using Weldbond epoxy, in conjuction with machine screws. as some of the walls were badly warped (the kit had been sitting, unbuilt, for several years)…
I’ll add trusses to the top of the posts shown in the overhead view, but make them part of a one-piece removeable roof. I’ve ordered some Grandt Line doors, but they won’t be operated remotely, as the roundhouse is almost at the edge of the upper level of my layout.
I also used some parts, left-over from a Walthers kit, to add a small annex to the rear of the building…
Wayne
I appreciate the offer Wayne but I built my Korber kit 18 years ago back when it cost $40. It’s been through three overhauls and it’s on it’s second turntable.
My LHS had it in stock or I probably would never have bought it, I hadn’t heard of Korber back then.
Mel
My Model Railroad
http://melvineperry.blogspot.com/
Bakersfield, California
I’m beginning to realize that aging is not for wimps.
</
Ok I think I got it correct this time.
The dimensions should be correct providing the roundhouse wall is 17.75” (128’ 10”) and the turntable is 17.9104” (130’)
Mel
My Model Railroad
http://melvineperry.blogspot.com/
Bakersfield, California
I’m beginning to realize that aging is not for wimps.
&n
The stall width is exactly 2" front, and 5" rear. The stall length is 17 5/8".
For what it is worth, the overall diameter of the turntable is 19 1/8", and the diameter of the pit is 18 1/4".
Rich
Well, yes, for ALL. At this point, it would only be of passing interest to me since I have found the right distance thanks to the replies to this thread. But, the mathematical calculation will benefit ALL of the members and guests who may be following this thread.
Rich
That sounds about right.
Rich
Based upon that formula, and my calculations, the distance between my roundhouse and turntable should be 2.625 inches. That is a little less than the 2.875 inches that I have determined without the formula, so I will place the roundhouse at this mathematical distance as a trial.
Rich
I used two pieces of flex track. I made them as straight as possible and put them into the outer engine stalls. I centered them inside the stalls and where they intersected became the center of the pit. Everything worked out fine.
In this picture, some of the tracks don’t line up correctly. The track was not attached to the base and I knocked them out of whack trying to get the engines on the tracks. Anyone with arthritis in their hands will understand.
