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(CH701) problems measuring 7H3-3SP

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john.marzulli(at)gmail.co
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Posted: Sat Jul 29, 2006 12:11 pm Post subject: (CH701) problems measuring 7H3-3SP

Has anyone had the following problem?



I'm starting my elevator/stab hinges and noticed a difference between the builder's manual, the plans and the manufactured piece supplied by Zenith concerning the Center Hinge Bracket ( 7H3-3SP ). 



Using the plans I measured 50mm into the flange to make a mark to draw the perpendicular line. This line was off center with the bracket tip by about 2mm. The builders manual states that the line should be centered with the tip. 



When tried to figure out why this was and I realized that the flange was 109mm in length, not 107mm as stated in the plans.



Since these measurments are enclosed by boxes on the plans, I assume they are critical, especially since being off will cause problems with the elevator's movement. 



Is it better to use the tip center to determine the line knowing that one side of the piece was manufactured 2mm to long, possibly grinding down that side? ( my guess )



Or would it be better to use the line drawn 50mm in? ( seems like that would weaken the hinge ) 



Thanks,



-- 

John Marzulli

http://701Builder.blogspot.com/

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Geoff Heap

Joined: 12 Jan 2006
Posts: 266
Location: Lindenwold, New Jersey

Posted: Sun Jul 30, 2006 2:53 pm Post subject: Re: (CH701) problems measuring 7H3-3SP

John. The dimension is critical as you suspect but the answer is not as simple as you imagined. The 50mm is for the hole location. The design intent is that the hole ends up 50mm from the upper flange of the spar. However, you should stop right here and study the plans a little so that you can see why this hole location is important. You will probably find that the answer is not quite either of the possibilities you mentioned but there is a "fudge" factor involved here.

Take a look at the stabiliser exploded view on 7-H-0. You will see your part 7H3-3SP at the top left as a stand alone part but it is in the assy view also. Look in the center rear of the assy. It sticks out of the rear and is not identified. It is in between the two 7H4 parts but on the rear of the spar. Now look to port and starboard from your part and you will see part 7H3-1. one at each end. You can see the holes in them. These three holes all need to line up nicely for your elevator to swivel freely.Because your part is 2mm oversize I suggest you put your hole in the middle of the radius and then trim some of the 2mm excess to achieve 50mm. If it's the other way around and you end up with 48mm by centering the hole within the rad, thats ok. Remember, the 50mm is the position needed from the top flange of the spar, not from the top of the part itself. You should drill the hole undersize by the way. You can get some adjustment out of it later if you drill it 1/8" only for now. You should also glance at page 7H4 lower left. Then go back to the page that has your part on it. I don't know what your blueprint reading skills are but there is a wealth of information in the 4 part views spread up and down the left side of the page. Look at the vertical line running through your hole. It shows the relationship with parts 7H3-1 that I mentioned out at the stabiliser ends. Sorry John nothings simple. If you make all your parts blindly to the print a lot of them wouldn't fit together. Hope this helps..........Geoff

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john.marzulli(at)gmail.co
Guest

Posted: Sun Jul 30, 2006 4:38 pm Post subject: (CH701) problems measuring 7H3-3SP

Thanks to everyone for their responses. I think the best thing for me to do is contact Zenith and get a replacement part.



After studying the plans for longer and reviewing everyone's responses I suspect that



   1) It's cut wrong

  2) The flange is bent in the wrong direction!



There is a photo of the piece on my blog.



Thanks,

John in Seattle



On 7/29/06,  John Marzulli <john.marzulli(at)gmail.com (john.marzulli(at)gmail.com)> wrote: 	  Quote: 	
		   Has anyone had the following problem?



I'm starting my elevator/stab hinges and noticed a difference between the builder's manual, the plans and the manufactured piece supplied by Zenith concerning the Center Hinge Bracket ( 7H3-3SP ). 



Using the plans I measured 50mm into the flange to make a mark to draw the perpendicular line. This line was off center with the bracket tip by about 2mm. The builders manual states that the line should be centered with the tip. 



When tried to figure out why this was and I realized that the flange was 109mm in length, not 107mm as stated in the plans.



Since these measurments are enclosed by boxes on the plans, I assume they are critical, especially since being off will cause problems with the elevator's movement. 



Is it better to use the tip center to determine the line knowing that one side of the piece was manufactured 2mm to long, possibly grinding down that side? ( my guess )



Or would it be better to use the line drawn 50mm in? ( seems like that would weaken the hinge ) 



Thanks,

-- 

John Marzulli

http://701Builder.blogspot.com/   

	


-- 

John Marzulli

http://701Builder.blogspot.com/

- The Matronics Zenith-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Zenith-List

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