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Gear fitting dimension

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John Bolding

Joined: 23 May 2006
Posts: 281

Posted: Thu May 13, 2010 3:01 am Post subject: Gear fitting dimension

In the middle of developing a glass gear for the 701 have hit a semi-snag.



I've discovered what I believe to be a discrepancy in the plans and real 

life parts.  I know that's hard to believe but I think it's true.



I need a dimension from actual PARTS so that I can get past the mold/plug 

stage and into the drop test/ prototype stage.



The two centering pins welded to the main gear fitting is the offending 

part, I need the distance CLEAR between them.



As many that can measure and send to me will improve the outcome as I'm 

making the mold fit the worst case senario.



Short background,

Gear engineered by former Scaled Composites lead engineer, he plays a 

composite aero engineer in real life for money.

Gear is strong enough to meet FAR23 loads criteria. No more bending the gear 

on botched landing.

      (Something else will bend first, maybe that's good, maybe not, I just 

decided I wanted a gear up to specs)

Will save 6-7 #

Same track and camber as original.

MAYBE internal brake lines, we'll see.



Thanks to all, you can respond off list if you wish, 

jnbolding1(at)teleshare.net



Kevin,  is that YOUR windshield??    Exactly my thoughts on how it should be 

done.



LO&SLO



John

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rvickski(at)yahoo.com
Guest

Posted: Thu May 13, 2010 7:30 am Post subject: Gear fitting dimension

Hi John,



I built the gear mounts, and yes either there is a discrepancy with  

the drawing or my  interpretation.



The gear leg calls for 3 1/4 material and then to file the bolt  

reliefs which locates the gear transversely. I used 3 inch material  

and still had to file the gear.



Is it not recommended to file the composite gear? If not, perhaps your  

gear could be 3.250 between the mounts and say 2.875 on the legs  

outboard of the mounts? side shift would then not be an issue.



What I've noticed in operation is that most of the gear flex happens  

between the mounts and I would bet money that even the factory gear  

mounts are 'as built'.

On May 13, 2010, at 7:01 AM, John Bolding wrote:



 	  Quote: 	
		   

 >



 In the middle of developing a glass gear for the 701 have hit a semi- 

 snag.



 I've discovered what I believe to be a discrepancy in the plans and  

 real life parts.  I know that's hard to believe but I think it's true.



 I need a dimension from actual PARTS so that I can get past the mold/ 

 plug stage and into the drop test/ prototype stage.



 The two centering pins welded to the main gear fitting is the  

 offending part, I need the distance CLEAR between them.



 As many that can measure and send to me will improve the outcome as  

 I'm making the mold fit the worst case senario.



 Short background,

 Gear engineered by former Scaled Composites lead engineer, he plays  

 a composite aero engineer in real life for money.

 Gear is strong enough to meet FAR23 loads criteria. No more bending  

 the gear on botched landing.

     (Something else will bend first, maybe that's good, maybe not, I  

 just decided I wanted a gear up to specs)

 Will save 6-7 #

 Same track and camber as original.

 MAYBE internal brake lines, we'll see.



 Thanks to all, you can respond off list if you wish, jnbolding1(at)teleshare.net



 Kevin,  is that YOUR windshield??    Exactly my thoughts on how it  

 should be done.



 LO&SLO



 John




	


Roy Szarafinski

roysgarage.com

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JohnDRead(at)aol.com
Guest

Posted: Thu May 13, 2010 2:24 pm Post subject: Gear fitting dimension

Hi John;

             I  took a look at my drawing set and the actual Gear Mounts. On sheet 7-L-2 item 1J  shows the gear legs to be 82 mm wide with the notches be 76 mm apart. The Gear  Mount on sheet 7-F-17 item 1SP shows the mounting threaded pins to be 77 mm  apart. I measured mine and the pins were 76 mm between them. The notches provide  the lateral positioning of the gear so they need to be there even with a  composite part, I think that if they were made 75 mm apart that should be OK.  The Gear Mounts are a substantial part and are probably welded in a fixture so I  suspect they are pretty consistent. The factory may be able to help with  inspection data.

  

 Regards,  John



CH701 - Colorado - Jabiru 3300



Cell: 719-494-4567

Home:  303-648-3261   

  In a message dated 5/13/2010 5:01:53 A.M. Mountain Daylight Time,  jnbolding1(at)teleshare.net writes:

  	  Quote: 	
		  -->    Zenith701801-List message posted by: "John Bolding"    <jnbolding1(at)teleshare.net>



In the middle of developing a glass    gear for the 701 have hit a semi-snag.



I've discovered what I believe    to be a discrepancy in the plans and real 

life parts.  I know that's    hard to believe but I think it's true.



I need a dimension from actual    PARTS so that I can get past the mold/plug 

stage and into the drop test/    prototype stage.



The two centering pins welded to the main gear fitting    is the offending 

part, I need the distance CLEAR between them.



As    many that can measure and send to me will improve the outcome as I'm    

making the mold fit the worst case senario.



Short    background,

Gear engineered by former Scaled Composites lead engineer, he    plays a 

composite aero engineer in real life for money.

Gear is strong    enough to meet FAR23 loads criteria. No more bending the gear 

on botched    landing.

      (Something else will bend first, maybe that's    good, maybe not, I just 

decided I wanted a gear up to specs)

Will save    6-7 #

Same track and camber as original.

MAYBE internal brake lines,    we'll see.



Thanks to all, you can respond off list if you wish,    

jnbolding1(at)teleshare.net



Kevin,  is that YOUR    windshield??    Exactly my thoughts on how it should be    

done.



LO&SLO



John  ========================= Use   utilities  Day  ================================================               - MATRONICS WEB FORUMS  ================================================             - List Contribution Web Site  sp;                             ===================================================

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John Bolding

Joined: 23 May 2006
Posts: 281

Posted: Fri May 14, 2010 4:32 am Post subject: Gear fitting dimension

I understand that lateral positioning needs to be addressed, if you make  the gear from alum, composites, marshmallows or unobtanium it's gotta be  held in place, side to side , fore and aft, and restricted against  rotation..

  

 They are NOT consistent, that's why I'm asking, I've had almost a 1/4"  difference so far on factory parts and slightly less on builder constructed  pieces.

  

 You absolutely don't , under any circumstances, want to score the uni  fibers in the gear, Composites 101.

 Thanks for your measurements.

  

 John

 [quote]   



   Hi John;

   The notches provide the lateral positioning of the gear so they need to    be there even with a composite part, I think that if they were made 75 mm    apart that should be OK. The Gear Mounts are a substantial part and are    probably welded in a fixture so I suspect they are pretty consistent. Regards,    John



CH701 - Colorado - Jabiru 3300

         In a message dated 5/13/2010 5:01:53 A.M. Mountain Daylight Time,    jnbolding1(at)teleshare.net writes:

    	  Quote: 	
		  -->      Zenith701801-List message posted by: "John Bolding"      <jnbolding1(at)teleshare.net>



In the middle of developing a glass      gear for the 701 have hit a semi-snag.



I've discovered what I believe      to be a discrepancy in the plans and real 

life parts.  I know      that's hard to believe but I think it's    true.

	




 	  Quote: 	
		    --> http://www.matronics.com/c

	
[b]

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JohnDRead(at)aol.com
Guest

Posted: Fri May 14, 2010 7:36 am Post subject: Gear fitting dimension

Hi John;

             I  understand the need to keep from nicking composite structures. One dimension  that may have a big variable is the lateral distance between the notches.  Perhaps a grommet or O ring of hard urethane over the pins would fix the  potential contact problem too. If the distance between the notches is not  to variable perhaps a step with a curve to the in side would work then the width  of the gear outboard of the clamps could be 75 mm or so and the section under  the fuselage remain at 82 mm.

  

 Regards,  John



CH701 - Colorado - Jabiru 3300



Cell: 719-494-4567

Home:  303-648-3261   

  In a message dated 5/14/2010 6:33:09 A.M. Mountain Daylight Time,  jnbolding1(at)teleshare.net writes:

  	  Quote: 	
		     I understand that lateral positioning needs to be addressed, if you make    the gear from alum, composites, marshmallows or unobtanium it's gotta be    held in place, side to side , fore and aft, and restricted against    rotation..

    

   They are NOT consistent, that's why I'm asking, I've had almost    a 1/4" difference so far on factory parts and slightly less on    builder constructed pieces.

    

   You absolutely don't , under any circumstances, want to score the uni    fibers in the gear, Composites 101.

   Thanks for your measurements.

    

   John

    	  Quote: 	
		       



     Hi John;

     The notches provide the lateral positioning of the gear so they need to      be there even with a composite part, I think that if they were made 75 mm      apart that should be OK. The Gear Mounts are a substantial part and are      probably welded in a fixture so I suspect they are pretty consistent. Regards,      John



CH701 - Colorado - Jabiru 3300

               In a message dated 5/13/2010 5:01:53 A.M. Mountain Daylight Time,      jnbolding1(at)teleshare.net writes:

      	  Quote: 	
		  --> Zenith701801-List message posted by: "John Bolding"        <jnbolding1(at)teleshare.net>



In the middle of developing a        glass gear for the 701 have hit a semi-snag.



I've discovered what I        believe to be a discrepancy in the plans and real 

life parts.  I        know that's hard to believe but I think it's      true.

	




 	  Quote: 	
		    --> http://www.matronics.com/c

	




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kmccune

Joined: 22 Sep 2007
Posts: 577
Location: Wisconsin, USA

Posted: Tue May 18, 2010 5:50 pm Post subject: Re: Gear fitting dimension

Hi John, 

Is this addressed to me? And to what are you referring? I posted some pics of Champs top a few days ago. Let me know because I do not have a wind shield yet and do not want to miss lead anyone.



Thanks



Kevin



STILL working on wings... graduation and fixing the kids cars will be over soon! I hope.



do not archive

RE:



 	  John Bolding wrote: 	
		  In the middle of developing a glass gear for the 701 have hit a semi-snag.



Kevin,  is that YOUR windshield??    Exactly my thoughts on how it should be 

done.



LO&SLO



John

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