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Hadley Rear Sight (Read 29420 times)

762x51 Participating Member Offline Posts: 40 Location: Greensboro, NC Joined: Apr 8^th, 2015	Hadley Rear Sight May 9^th, 2015 at 3:51pm	Print Post
	Another board member and I were discussing the Hadley rear sight and if a reproduction could be made by reverse engineering an original. As neither of us have one patent drawings were found and I used them to try to draw the sight with an assumption that the sight base was .750" wide and the sight leaf .200" thick. Attached is an isometric view of the patent drawing and a rendering of the sight that I've drawn based on these assumptions. Does someone have an original that they are willing to make some measurements so I can make corrections to eventually make some accurate drawings? I don't want to publish the drawings I've produced until I do have accurate measurements because if I do then they will spread across the net and there will just be more inaccurate data floating around. What I do propose is that once the drawings have been made - accurate ones - then I will turn them over to the ASSRA archivist and he can sell them to support the cost of maintaining the WEB site and forum. Comments?? Regards, Orin

	"It is well that war is so terrible lest we should grow too fond of it." Gen. R.E. Lee CSA The United States Constitution (c) 1791. All Rights Reserved.
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chipmaker Senior Forum Member Offline Posts: 346 Location: san diego Joined: Sep 24^th, 2007	Re: Hadley Rear Sight Reply #1 - May 9^th, 2015 at 7:36pm	Print Post
	Orin, I think that it was Dr. Maynard who tracked down the patent information on the Hadley sight and presented it in one of the ASSRA Forums. Thank you DM. I don't own a Hadley tang sight and the dimensions below were taken from their standard tang sight, Both the patent drawings and pictures of the Hadley sight suggest that it uses the same base as the standard tang sight and that the sight staff is either the same length or very similar. This would allow the use of the Hadley sight without the need for changes to the tang hole spacing or sight spring. Hopefully an owner of a Hadley sight will add additional details and correct any differences between the Hadley and standard tang sights. Base dimensions: Width is .514" (same as tang width) Length is 1.242" Screws are 8-32 (or maybe 8-28), head is .250"X.100" and ,300" length under the head. Cut out for the staff is centered and .455"X.326" Staff screw is a 10-24 tip ,with a head 300"X.075" thick and .630" OAL Staff is .142"thick, .514" wide and 3.775" OAL. the center section is .282" wide and 2.77" long. It starts .125" from the top and the side of the staff are .115" wide. the bottom of the staff is rounded (.424" in diameter) and has a .195" hole for the retaining screw. There are two indents to retain the staff in the lowered and upright positions. Otto


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762x51 Participating Member Offline Posts: 40 Location: Greensboro, NC Joined: Apr 8^th, 2015	Re: Hadley Rear Sight Reply #2 - May 9^th, 2015 at 9:07pm	Print Post
	Hi Otto, Thanks for the dimensions and thanks to Dr. Maynard for digging up the patent drawings. Questions: 1) What's the thickness of the bottom of the base 2) Center/Center distance between base mounting holes 3) Are mounting holes countersunk? If so - depth A photo of the sight you are working from would be a great help. That's all for now - Orin

	"It is well that war is so terrible lest we should grow too fond of it." Gen. R.E. Lee CSA The United States Constitution (c) 1791. All Rights Reserved.
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chipmaker Senior Forum Member Offline Posts: 346 Location: san diego Joined: Sep 24^th, 2007	Re: Hadley Rear Sight Reply #3 - May 9^th, 2015 at 11:33pm	Print Post
	Orin, Thickness of the base bottom is .125" Center to center of mounting holes and screws is ,860" Mounting holes countersunk .100" Below are some pictures of the Maynard standard tang sight. Otto


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762x51 Participating Member Offline Posts: 40 Location: Greensboro, NC Joined: Apr 8^th, 2015	Re: Hadley Rear Sight Reply #4 - May 10^th, 2015 at 1:02am	Print Post
	Otto, Here is the updated parts based on the info I have now. Need info on the slide parts. Orin

	"It is well that war is so terrible lest we should grow too fond of it." Gen. R.E. Lee CSA The United States Constitution (c) 1791. All Rights Reserved.
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Deadeye Bly Frequent Elocutionist Offline Posts: 1074 Location: Stephens City Joined: Feb 25^th, 2011	Re: Hadley Rear Sight Reply #5 - May 10^th, 2015 at 7:50am	Print Post
	The two screws that hold the sight onto the tang are #8-30 tpi. Those are the only ones I've made for the sight.


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chipmaker Senior Forum Member Offline Posts: 346 Location: san diego Joined: Sep 24^th, 2007	Re: Hadley Rear Sight Reply #6 - May 10^th, 2015 at 9:45pm	Print Post
	Orin, Here are the photos of the inside parts. In rereading Layman's book and looking through the old Maynard catalogs, there appears to be an"Eyecup" ($.75) for the standard tang sight. Maybe one of the forum members can provide additional information on this accessory.


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chipmaker Senior Forum Member Offline Posts: 346 Location: san diego Joined: Sep 24^th, 2007	Re: Hadley Rear Sight Reply #7 - May 10^th, 2015 at 9:46pm	Print Post
	Here are the rest of the photos.


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chipmaker Senior Forum Member Offline Posts: 346 Location: san diego Joined: Sep 24^th, 2007	Re: Hadley Rear Sight Reply #8 - May 10^th, 2015 at 10:04pm	Print Post
	Orin, Here are the dimensions that go with the preceding photos. The two screws are .093" in diameter and an odd ball #3-? thread. 3-56 is close. The long piece on the muzzle side is 1" long X.510" wide and .025" thick. The raised area is .453" long X .285" wide and .092" thick. The holes are on .221" centers and the center of the top hole is .1" from the top edge. The piece with the sight hole is .515" long X .394" wide and .048" thick. The hole itself is about .030" and is counterbored .100" diameter X .025"-.03" deep. The windage slot is .308" long X .096" wide. It is centered and .200" from the bottom edge. The T-nut piece is .512"wide and .450" long the top portion is .116" thick and the bottom portion is .069" thick. The top hole is .096" and counterbored for the 3-56 screw and the bottom hole is taped for the 3-56 screw. As the preceding dimensions go into your model, it should be easy to pick up any mistakes. Otto


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762x51 Participating Member Offline Posts: 40 Location: Greensboro, NC Joined: Apr 8^th, 2015	Re: Hadley Rear Sight Reply #9 - May 10^th, 2015 at 10:17pm	Print Post
	Hi Otto, Thanks for the photos and measurements. I'll work on this tomorrow evening and should have the model finished before bedtime here on the east coast. Once finished, I'll post the rendering of the sight assembly. After the 2D drawings are completed I'll send the PDF file to Laurie Gapko for him to add to the items he has to offer through the ASSRA Archives. Orin

	"It is well that war is so terrible lest we should grow too fond of it." Gen. R.E. Lee CSA The United States Constitution (c) 1791. All Rights Reserved.
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Chuckster Frequent Elocutionist Offline Posts: 2240 Location: Colorado Joined: May 15^th, 2008	Re: Hadley Rear Sight Reply #10 - May 10^th, 2015 at 10:50pm	Print Post
	Excellent renderings and appreciate what you are doing, but don't see the detent and spring to hold the sight vertical. Think the detent is shown on the original. Maybe just don't understand what I am seeing. Chuck


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762x51 Participating Member Offline Posts: 40 Location: Greensboro, NC Joined: Apr 8^th, 2015	Re: Hadley Rear Sight Reply #11 - May 10^th, 2015 at 10:59pm	Print Post
	Chuck, I haven't gotten the measurements for the detents from Otto yet and when I do I'll add them. Orin

	"It is well that war is so terrible lest we should grow too fond of it." Gen. R.E. Lee CSA The United States Constitution (c) 1791. All Rights Reserved.
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Chuckster Frequent Elocutionist Offline Posts: 2240 Location: Colorado Joined: May 15^th, 2008	Re: Hadley Rear Sight Reply #12 - May 10^th, 2015 at 11:25pm	Print Post
	Thanks. Like what you are doing. Chuck


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762x51 Participating Member Offline Posts: 40 Location: Greensboro, NC Joined: Apr 8^th, 2015	Re: Hadley Rear Sight Reply #13 - May 10^th, 2015 at 11:28pm	Print Post
	Thanks Chuck, I rotated a drawing that Otto sent me 1.8 degrees and everything fell into place or at least I *think* it did. I'll wait until I hear from Otto before I modify the model. Orin
	« Last Edit: May 10^th, 2015 at 11:52pm by 762x51 »
	"It is well that war is so terrible lest we should grow too fond of it." Gen. R.E. Lee CSA The United States Constitution (c) 1791. All Rights Reserved.
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ron Oldtimer Offline Posts: 576 Location: Augusta Maine Joined: Nov 15^th, 2009	Re: Hadley Rear Sight Reply #14 - May 11^th, 2015 at 6:57am	Print Post
	Great work on your part. THANKS ron


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