Sagitta Rule - Revision history

Dnevil: /* Construction */

2021-11-15T17:38:18Z

Construction

← Older revision		Revision as of 12:38, 15 November 2021
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	Note: Paul Havasi pointed out that it is quite easy to set one's printer at a slightly different scale to make things fit, then forget to reset it. You can easily verify that the sagitta rule below prints to the correct scale by measuring the distance for 120' (feet) and validating it is 1.25 inches.		Note: Paul Havasi pointed out that it is quite easy to set one's printer at a slightly different scale to make things fit, then forget to reset it. You can easily verify that the sagitta rule below prints to the correct scale by measuring the distance for 120' (feet) and validating it is 1.25 inches.

	~~Paul Havasi~~

	* [http://ibls.org/files/2020/CharlesField_TrackPanelJig/150_Sagitta_Rule_for_10_Foot_Rail.pdf Sagitta Rule for 10 Foot Rail (PDF)]		* [http://ibls.org/files/2020/CharlesField_TrackPanelJig/150_Sagitta_Rule_for_10_Foot_Rail.pdf Sagitta Rule for 10 Foot Rail (PDF)]

2021-11-15T17:37:20Z

← Older revision		Revision as of 12:37, 15 November 2021
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	In Live Steam a [[Sagitta Rule]] is used to directly measure the radius of a curved section of track.		In Live Steam a [[Sagitta Rule]] is used to directly measure the radius of a curved section of track.

			See also [[Rail bender]].

	== Calculating ==		== Calculating ==

2021-08-30T17:21:53Z

Construction

← Older revision		Revision as of 12:21, 30 August 2021
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	It is easy to construct a [[Sagitta Rule]]. Obtain a large paint stir stick (for 5 gallon buckets of paint) from a big box store or where paint is sold. Print the following paper rule. Cut out and tape or glue to the end of the paint stir stick.		It is easy to construct a [[Sagitta Rule]]. Obtain a large paint stir stick (for 5 gallon buckets of paint) from a big box store or where paint is sold. Print the following paper rule. Cut out and tape or glue to the end of the paint stir stick.

			Note: Paul Havasi pointed out that it is quite easy to set one's printer at a slightly different scale to make things fit, then forget to reset it. You can easily verify that the sagitta rule below prints to the correct scale by measuring the distance for 120' (feet) and validating it is 1.25 inches.

			Paul Havasi

	* [http://ibls.org/files/2020/CharlesField_TrackPanelJig/150_Sagitta_Rule_for_10_Foot_Rail.pdf Sagitta Rule for 10 Foot Rail (PDF)]		* [http://ibls.org/files/2020/CharlesField_TrackPanelJig/150_Sagitta_Rule_for_10_Foot_Rail.pdf Sagitta Rule for 10 Foot Rail (PDF)]

2020-12-03T22:14:05Z

← Older revision		Revision as of 17:14, 3 December 2020
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	[[Category:Definitions]]		[[Category:Definitions]]
	[[File:Sagitta.svg\|thumb\|right\|300px\|Visualization of the sagitta. The red line marked with <i>s</i> is the sagitta of the arc.]]		[[File:Sagitta.svg\|thumb\|right\|300px\|Visualization of the sagitta. The red line marked with <i>s</i> is the sagitta of the arc.]]
			by [[Daris A Nevil]]

	[https://en.wikipedia.org/wiki/Sagitta_(geometry) From <i>Wikipedia</i>]:		[https://en.wikipedia.org/wiki/Sagitta_(geometry) From <i>Wikipedia</i>]:

2020-12-03T22:13:01Z

Use

← Older revision		Revision as of 17:13, 3 December 2020
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	== Use ==		== Use ==

			Using a [[Sagitta Rule]] is as simple as following these steps.

			<gallery widths=300px heights=300px perrow=2>
			File:2020-12-03 10.42.26.jpg\|Step 1: Place the ends of the rail against a wall or other straight edge. Place the Sagitta Rule at the midpoint of the rail, where the distance from the wall is greatest.
			File:2020-12-03 10.42.41.jpg\|Step 2: Read the radius of the rail from the Sagitta Rule. In this photo the rail has a curve approximating a 50 foot radius.
			</gallery>

2020-12-02T21:24:26Z

Calculating

2020-12-02T21:09:59Z

Calculating

← Older revision		Revision as of 16:09, 2 December 2020
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	The following spreadsheet is provided to calculate the ''sagitta'' value for different radius curves for 10 foot and 20 foot rail lengths.		The following spreadsheet is provided to calculate the ''sagitta'' value for different radius curves for 10 foot and 20 foot rail lengths.

	* [http://ibls.org/files/2020/CharlesField_TrackPanelJig/~~Length_of_Curved_Rail_20201115~~.xlsx Sagitta calculator spreadsheet (XLSX)]		* [http://ibls.org/files/2020/CharlesField_TrackPanelJig/Length_of_Curved_Rail_20201202.xlsx Sagitta calculator spreadsheet (XLSX)]

	Here are the values provided by the spreadsheet above.		Here are the values provided by the spreadsheet above.

2020-12-02T21:09:08Z

Calculating

← Older revision		Revision as of 16:09, 2 December 2020
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	* [http://ibls.org/files/2020/CharlesField_TrackPanelJig/Length_of_Curved_Rail_20201115.xlsx Sagitta calculator spreadsheet (XLSX)]		* [http://ibls.org/files/2020/CharlesField_TrackPanelJig/Length_of_Curved_Rail_20201115.xlsx Sagitta calculator spreadsheet (XLSX)]

			Here are the values provided by the spreadsheet above.

	== Construction ==		== Construction ==

2020-12-02T19:32:38Z

← Older revision		Revision as of 14:32, 2 December 2020
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	== Calculating ==		== Calculating ==

			The following spreadsheet is provided to calculate the ''sagitta'' value for different radius curves for 10 foot and 20 foot rail lengths.

			* [http://ibls.org/files/2020/CharlesField_TrackPanelJig/Length_of_Curved_Rail_20201115.xlsx Sagitta calculator spreadsheet (XLSX)]

	== Construction ==		== Construction ==

2020-12-02T04:49:09Z

Construction

← Older revision		Revision as of 23:49, 1 December 2020
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	In Live Steam a [[Sagitta Rule]] is used to directly measure the radius of a curved section of track.		In Live Steam a [[Sagitta Rule]] is used to directly measure the radius of a curved section of track.

			== Calculating ==

	== Construction ==		== Construction ==