Southern valve gear - Revision history

Dnevil: /* External Links */

2014-10-22T17:43:16Z

External Links

← Older revision		Revision as of 11:43, 22 October 2014
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	* [http://home.fuse.net/jasdot/southernVG/southernVG.html "Southern Valve Gear as Applied to an Allen Models 4-6-0", <i>Jim Keith</i>]		* [http://home.fuse.net/jasdot/southernVG/southernVG.html "Southern Valve Gear as Applied to an Allen Models 4-6-0", <i>Jim Keith</i>]
	* [http://www.steamlocomotive.com/appliances/valvegear.php Animated Valve Gear, <i>SteamLocomotive.com</i>]		* [http://www.steamlocomotive.com/appliances/valvegear.php Animated Valve Gear, <i>SteamLocomotive.com</i>]
			* [http://www.chaski.org/homemachinist/viewtopic.php?f=8&t=99992&sid=c1ebc2eaee684d1bd8dcc473626786c3 "Expansion Link Materials", <i>Chaski.org</i>]

Dnevil: /* External Links */

2014-08-12T03:02:39Z

External Links

← Older revision		Revision as of 21:02, 11 August 2014
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	* [http://en.wikipedia.org/wiki/Southern_valve_gear "Southern valve gear", <i>Wikipedia</i>]		* [http://en.wikipedia.org/wiki/Southern_valve_gear "Southern valve gear", <i>Wikipedia</i>]
	* [http://home.fuse.net/jasdot/southernVG/southernVG.html "Southern Valve Gear as Applied to an Allen Models 4-6-0", <i>Jim Keith</i>]		* [http://home.fuse.net/jasdot/southernVG/southernVG.html "Southern Valve Gear as Applied to an Allen Models 4-6-0", <i>Jim Keith</i>]
			* [http://www.steamlocomotive.com/appliances/valvegear.php Animated Valve Gear, <i>SteamLocomotive.com</i>]

Dnevil: /* External Links */

2014-08-12T02:51:19Z

External Links

← Older revision		Revision as of 20:51, 11 August 2014
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	* [http://en.wikipedia.org/wiki/Southern_valve_gear "Southern valve gear", <i>Wikipedia</i>]		* [http://en.wikipedia.org/wiki/Southern_valve_gear "Southern valve gear", <i>Wikipedia</i>]
			* [http://home.fuse.net/jasdot/southernVG/southernVG.html "Southern Valve Gear as Applied to an Allen Models 4-6-0", <i>Jim Keith</i>]

Dnevil: /* Southern Valve Gear */

2014-07-03T18:09:55Z

Southern Valve Gear

← Older revision		Revision as of 12:09, 3 July 2014
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	[[File:CarlPurinton HarryDixon 1954.jpg\|thumb\|right\|300px\|Carl Purinton and Harry Dixon.]]		[[File:CarlPurinton HarryDixon 1954.jpg\|thumb\|right\|300px\|Carl Purinton and Harry Dixon.]]

	The question about the [http://en.wikipedia.org/wiki/Southern_valve_gear Southern valve gear] by G. B. Thomas in [[The Miniature Locomotive]] for September-October 1954 brings up a matter that is hard to explain. Almost everyone has his own pet reference book on the various valve gears and the ~~mthods~~ of how to lay them out. I do not profess to be an authority of any kind on valve gears, but I agree 100% with one of the best locomotive ~~desigvners~~ of all time. He was once asked about what was a good reliable book to get. His reply was to the effect that they all had one outstanding feature; they were all notorious for What They Did Not Tell!		The question about the [http://en.wikipedia.org/wiki/Southern_valve_gear Southern valve gear] by G. B. Thomas in [[The Miniature Locomotive]] for September-October 1954 brings up a matter that is hard to explain. Almost everyone has his own pet reference book on the various valve gears and the methods of how to lay them out. I do not profess to be an authority of any kind on valve gears, but I agree 100% with one of the best locomotive designers of all time. He was once asked about what was a good reliable book to get. His reply was to the effect that they all had one outstanding feature; they were all notorious for What They Did Not Tell!

	Now, we all know that the backset of the eccentric rod pin hole in the tail of a Walschaert's link is put there to correct for the angularities in the rods and that the backset is necessary to obtain an equal swing of the link. This is one of the most critical points in the design of the whole gear and yet almost all books skip lightly over this and one is still left out in the dark after studying them. The best method that I ever recall seeing was given by our always dependable instructor, [[LBSC]], in [[A Suggestion for Setting Out Walschaerts Gear\|The Model Engineer of July 4, 1935]].		Now, we all know that the backset of the eccentric rod pin hole in the tail of a [[Walschaert valve gear\|Walschaert's link]] is put there to correct for the angularities in the rods and that the backset is necessary to obtain an equal swing of the link. This is one of the most critical points in the design of the whole gear and yet almost all books skip lightly over this and one is still left out in the dark after studying them. The best method that I ever recall seeing was given by our always dependable instructor, [[LBSC]], in [[A Suggestion for Setting Out Walschaerts Gear\|The Model Engineer of July 4, 1935]].

	The same situation exists with the [http://en.wikipedia.org/wiki/Southern_valve_gear Southern valve gear], only in this case it is the angle of the two arms of the bellcrank. The included angle of the two arms is somewhere between 70 and 75 degrees. none of the books or articles that I have seen gives the angle nor do they tell how to figure it. If one puts a protractor on the various drawings, the angle comes out as stated above. My idea is that the angle here is essential for correcting angularity. The best dope on the Southern gear that I know of is in the book, [[The Locomotive Up to Date]] by McShane, the revised edition of 1920. With this book and [[LBSC]]'s axiom that the eccentric crank pin circle should be two-thirds of the piston ~~troke~~, the necessary features are well covered.		The same situation exists with the [http://en.wikipedia.org/wiki/Southern_valve_gear Southern valve gear], only in this case it is the angle of the two arms of the bellcrank. The included angle of the two arms is somewhere between 70 and 75 degrees. none of the books or articles that I have seen gives the angle nor do they tell how to figure it. If one puts a protractor on the various drawings, the angle comes out as stated above. My idea is that the angle here is essential for correcting angularity. The best dope on the Southern gear that I know of is in the book, [[The Locomotive Up to Date]] by McShane, the revised edition of 1920. With this book and [[LBSC]]'s axiom that the eccentric crank pin circle should be two-thirds of the piston stroke, the necessary features are well covered.

	== External Links ==		== External Links ==

	* [http://en.wikipedia.org/wiki/Southern_valve_gear "Southern valve gear", <i>Wikipedia</i>]		* [http://en.wikipedia.org/wiki/Southern_valve_gear "Southern valve gear", <i>Wikipedia</i>]

Dnevil at 02:21, 30 June 2014

2014-06-30T02:21:07Z

@@ Line 2: / Line 2: @@
 [[Southern valve gear]] was briefly popular on steam locomotives in the United States. It combines elements of the [[Walschaert valve gear|Walschaerts]] and [[Baker valve gear|Baker]] patterns.
 == External Links ==
 * [http://en.wikipedia.org/wiki/Southern_valve_gear "Southern valve gear", <i>Wikipedia</i>]

Dnevil at 02:50, 28 June 2014

2014-06-28T02:50:26Z

← Older revision		Revision as of 20:50, 27 June 2014
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	[[Category:Steam Locomotive Parts]]		[[Category:Steam Locomotive Parts]]

	[[Southern valve gear]] was briefly popular on steam locomotives in the United States. It combines elements of the [[~~Walschaerts~~ valve gear\|Walschaerts]] and [[Baker valve gear\|Baker]] patterns.		[[Southern valve gear]] was briefly popular on steam locomotives in the United States. It combines elements of the [[Walschaert valve gear\|Walschaerts]] and [[Baker valve gear\|Baker]] patterns.

	== External Links ==		== External Links ==

	* [http://en.wikipedia.org/wiki/Southern_valve_gear "Southern valve gear", <i>Wikipedia</i>]		* [http://en.wikipedia.org/wiki/Southern_valve_gear "Southern valve gear", <i>Wikipedia</i>]

Dnevil: Created page with "Category:Steam Locomotive Parts Southern valve gear was briefly popular on steam locomotives in the United States. It combines elements of the [[Walschaerts valve gea..."

2014-06-28T02:49:48Z

Created page with "Category:Steam Locomotive Parts Southern valve gear was briefly popular on steam locomotives in the United States. It combines elements of the [[Walschaerts valve gea..."

New page

[[Category:Steam Locomotive Parts]]

[[Southern valve gear]] was briefly popular on steam locomotives in the United States. It combines elements of the [[Walschaerts valve gear|Walschaerts]] and [[Baker valve gear|Baker]] patterns.

== External Links ==

* [http://en.wikipedia.org/wiki/Southern_valve_gear "Southern valve gear", <i>Wikipedia</i>]