Matronics Email Lists :: View topic - A Few Questions for Scratchbuilders

Matronics Email Lists
Web Forum Interface to the Matronics Email Lists

Get Email Distribution Too! FAQ Search Memberlist Usergroups Register

Profile Log in to check your private messages Log in

A Few Questions for Scratchbuilders

Matronics Email Lists Forum Index -> Zenith-List

View previous topic :: View next topic

Author Message

dfmoeller

Joined: 19 Jun 2006
Posts: 60
Location: Austin, TX

Posted: Wed Feb 07, 2007 3:55 pm Post subject: A Few Questions for Scratchbuilders

Thank God for this forum!



I have two questions for the scratch-builders out there.



The First:



I am not clear on the meaning of one of the diagrams on the 601 XL rear wing 

rib drawing 6W6.  My question is this:



The detail diagram of the edge of the forming block on the spar side, says 

to "file the top of the block 90 degrees to spar flange on 25 mm".  A length 

dimension of 214.9 mm is shown as the spar face length of the forming 

blocks.  The distance from X=0, Yu=147 to X=33.8, Yl=66.5 (as shown in the 

curve point table) is 216.16 mm, implying that 1.2 to 1.3 mm should be 

removed by the filing operation.  Note:  this is not the joggle, since the 

joggle is clearly stated, in the blank forming diagram, to apply to both top 

and bottom flanges.  The filing is only done (per drawing) to the top 

forming block edge.



Am I correct in executing the following steps in this order?



1.  Sand edges of forming block to the curve table points.



2.  Sand 1.2 mm off in the region shown perpendicular to the spar side edge 

(should leave a spar side edge 214.9 mm long, but it leaves a flat top 

surface far longer than 25 mm).



3.  Apply 1/8" radius to forming block edge all around.



4.  Sand 10 degree springback all around forming block (except rear channel 

side which should be 13 degrees).



This will result in a forming block with a straight section abutting the 

curve points.



The reason I'm being fussy about this 1.2 mm is that, this is exactly the 

region in which the tolerance should be held to a mouse whisker.



Can some of you who've been through this step tell me if I'm interpreting 

this correctly?



Second Issue:



The rear panel for the lockers is shown on the drawing as 498 mm length with 

sides of 225 and 218 mm.  What isn't shown clearly are the angles in which 

these sides meet.  I'm guessing that the top side is perpendicular to the 

225 and 218 sides, but it could also be the case that this piece is cut 

trapezoidally, or even the perpendicular side could be the bottom????.



Maybe I'm overlooking an obvious clue here; in case I am, please bear with 

me.



Someone who has installed the lockers please clue me in on the correct way 

to cut this piece.



I do appreciate the help in this forum!



Doug

- 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

p.mulwitz(at)worldnet.att
Guest

Posted: Wed Feb 07, 2007 5:23 pm Post subject: A Few Questions for Scratchbuilders

The locker panel is almost rectangular, but actually a trapezoid 

(almost?).  This is because the wing tapers a little bit at that 

point.  I suggest you start with it cut as a rectangle and adjust the 

few mm needed as you fit it in place.  If you build it according to 

the photo guide, the bottom skin will already be riveted in place, 

and I suggest you fit the angle that meets the top skin before trying 

to drill pilot holes in the rear panel.



One issue to watch here is the orientation of the flanges on the rear 

ribs surrounding the locker.  The drawings are a little vague 

(wrong?) on this point.  The proper way is to have the flanges on the 

rear ribs on both sides of the locker facing away from the 

locker.  This gives you a smooth side wall on both the inboard and 

outboard side of the locker.  If you get this wrong, the rear panel 

for the locker will need to be a considerably different size.



Good luck,



Paul

XL fuselage

At 03:52 PM 2/7/2007, you wrote:

 	  Quote: 	
		  The rear panel for the lockers is shown on the drawing as 498 mm 

length with sides of 225 and 218 mm.  What isn't shown clearly are 

the angles in which these sides meet.  I'm guessing that the top 

side is perpendicular to the 225 and 218 sides, but it could also be 

the case that this piece is cut trapezoidally, or even the 

perpendicular side could be the bottom????.



Maybe I'm overlooking an obvious clue here; in case I am, please bear with me.



Someone who has installed the lockers please clue me in on the 

correct way to cut this piece.

- 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

Display posts from previous:

	Matronics Email Lists Forum Index -> Zenith-List	All times are GMT - 8 Hours
Page 1 of 1

Jump to:

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum