Minimum radius for 2 ft. gauge
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Topics may include: antique park gauge train restoration, preservation, and history; building new grand scale equipment from scratch; large scale miniature railway construction, maintenance, and safe operation; fallen flags; track, gauge, and equipment standards; grand scale vendor offerings; and, compiling an on-line motive power roster.
Topics may include: antique park gauge train restoration, preservation, and history; building new grand scale equipment from scratch; large scale miniature railway construction, maintenance, and safe operation; fallen flags; track, gauge, and equipment standards; grand scale vendor offerings; and, compiling an on-line motive power roster.
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Minimum radius for 2 ft. gauge
Using a set of driving wheels that are 20" in diameter and 34" center to center on the axles.
- Bill Shields
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Re: Minimum radius for 2 ft. gauge
A bit more info needed before providing meaningful response:
How many driving axles?
How many leading or trailing axles?
Side play in driving axles?
Side travel or play on leading or trailing axles?
Any blind driving axles?
How many driving axles?
How many leading or trailing axles?
Side play in driving axles?
Side travel or play on leading or trailing axles?
Any blind driving axles?
Too many things going on to bother listing them.
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Re: Minimum radius for 2 ft. gauge
Here is an informative and similar thread.
http://www.chaski.org/homemachinist/vie ... hp?t=94864
It’s a quick read as only 5 or 6 replies. The essence is, the trailing truck can disproportionately increase minimum turning radius.
Also, a quick rule of thumb mentioned is: wheelbase (W) times 20 = minimum turning radius (R)
So in your case - 34” x20 = 680”
Or, R= 56.7’.
A respectable minimum turning radius considering 20” drivers, which implies a fairly large locomotive- in the 4” (1/3 rd) scale class.
BTW, I recently acquired Ben Hammer’s complete pattern set for casting parts for his 4” scale 4-4-0 American. The drivers are 20” diameter spoked wheels. Could also be used for an Atlantic 4-4-2 in similar scale and gauge.
Glenn
http://www.chaski.org/homemachinist/vie ... hp?t=94864
It’s a quick read as only 5 or 6 replies. The essence is, the trailing truck can disproportionately increase minimum turning radius.
Also, a quick rule of thumb mentioned is: wheelbase (W) times 20 = minimum turning radius (R)
So in your case - 34” x20 = 680”
Or, R= 56.7’.
A respectable minimum turning radius considering 20” drivers, which implies a fairly large locomotive- in the 4” (1/3 rd) scale class.
BTW, I recently acquired Ben Hammer’s complete pattern set for casting parts for his 4” scale 4-4-0 American. The drivers are 20” diameter spoked wheels. Could also be used for an Atlantic 4-4-2 in similar scale and gauge.
Glenn
Moderator - Grand Scale Forum
Motive power : 1902 A.S.Campbell 4-4-0 American - 12 5/8" gauge, 1955 Ottaway 4-4-0 American 12" gauge
Ahaha, Retirement: the good life - drifting endlessly on a Sea of projects....
Motive power : 1902 A.S.Campbell 4-4-0 American - 12 5/8" gauge, 1955 Ottaway 4-4-0 American 12" gauge
Ahaha, Retirement: the good life - drifting endlessly on a Sea of projects....
Re: Minimum radius for 2 ft. gauge
Some factors to take into account:
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Re: Minimum radius for 2 ft. gauge
http://www.catskillarchive.com/rrextra/plate097.Html
This is the model we are working on. It is scaled for 2 ft. gauge.
This is the model we are working on. It is scaled for 2 ft. gauge.
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Re: Minimum radius for 2 ft. gauge
Hello Friends
A Forney type of locomotive will require a larger turning radius than even a short wheelbase 0-6-0 this is due to its greater distance from the front driver to the truck pivot . That distance will determine the minimum radius . You could make the same locomotive with a short 4 wheel tender and get close to the same appearance. If you really want a Forney type may I suggest looking into some of the Mason Locomotive works engines.. they were articulated and would go around sharper curves.. if I recall correctly I think porter advertised their 0-4-0 locomotives going around 25 foot radius curves.you have a nice project ahead of you happy building..
A Forney type of locomotive will require a larger turning radius than even a short wheelbase 0-6-0 this is due to its greater distance from the front driver to the truck pivot . That distance will determine the minimum radius . You could make the same locomotive with a short 4 wheel tender and get close to the same appearance. If you really want a Forney type may I suggest looking into some of the Mason Locomotive works engines.. they were articulated and would go around sharper curves.. if I recall correctly I think porter advertised their 0-4-0 locomotives going around 25 foot radius curves.you have a nice project ahead of you happy building..
Re: Minimum radius for 2 ft. gauge
As K. Brouwers notes the limiting factor for the minium radius on a Forney is the swing of the Trailing Truck.Springhill-RR wrote: ↑Mon Aug 30, 2021 10:19 am http://www.catskillarchive.com/rrextra/plate097.Html
This is the model we are working on. It is scaled for 2 ft. gauge.
Mr. Jack Bodenmann found a solution to alleviate this problem by getting rid of the traditional swing bolster and instead using roller bearing ( https://www.mcmaster.com/track-rollers/ ) to make a bolster that would roll side-to-side in a channel. This allowed his 3-3/4" scale 7-1/2" gage 2-4-4T #9 to negotiate much tighter radii than it would have normally been able to.
Figure out how much travel you'll be able to get on your Trailing Truck and that will tell you the minimum radius of track.
25+ Years of SolidWorks experience...now I feel old.
"You can lead a horse to water, but you can't make him drink."
"Winning an argument on the internet is like winning the Special Olympics."
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"You can lead a horse to water, but you can't make him drink."
"Winning an argument on the internet is like winning the Special Olympics."
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Re: Minimum radius for 2 ft. gauge
I plan to make the tender separate.
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Re: Minimum radius for 2 ft. gauge
James, where is that locomotive, British looking machine with an American style box car in the background pretty odd I would say. If it weren't for the background it looks a lot like the little railroad at the London Steam museum at Kew Bridge.
- Bill Shields
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Re: Minimum radius for 2 ft. gauge
Freight container is Evergreen Taiwan...which means nothing..they are everywhere
Statfold barn rwy in the UK.
Statfold barn rwy in the UK.
Too many things going on to bother listing them.
- Erskine Tramway
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Re: Minimum radius for 2 ft. gauge
My 1919ish Koppel '100% American Owned, General Catalog Number One' shows 30-foot radius on their 2-foot gauge portable track. They also had 12-foot radius switches.
So, that would probably indicate what was 'standard' at the time. Admittedly, the equipment, cars and locomotives, was probably all 4-wheeled.
Mike
So, that would probably indicate what was 'standard' at the time. Admittedly, the equipment, cars and locomotives, was probably all 4-wheeled.
Mike
Former Locomotive Engineer and Designer, Sandley Light Railway Equipment Works, Inc. and Riverside & Great Northern Railway 1962-77
BN RR Locomotive Engineer 1977-2014, Retired
BN RR Locomotive Engineer 1977-2014, Retired