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upper bearing

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carlossa52(at)gmail.com
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Posted: Sun Jun 10, 2012 3:18 pm Post subject: upper bearing

Hello, allI am working on the (CH601-HD) firewall, and I am doing some changes based on the XL and the 750 firewall.  The addition of the plastic upper bearing is causing me a bit of concern.In my case, the bearing interferes with rivets placed through 6F10-2 (the original CH601-HD upper bearing) and 6F8-2 (firewall stiffener).  These parts can be sen on page 11 of this document: http://www.zenithair.com/pdf-doc/601-firewall-gear-rib.pdf  I am using UHDMW (or some such mix of letters) 3/8" thick.I cut notches to clear the rivets.  What is bugging me is that I could not find any comments about this interference, so maybe I am doing something incredibly wrong (I am not content with doing anything just "credibly" wrong).  My "notched" upper bearing can be seen here: http://www.flickr.com/photos/54366879(at)N06/7359287022/  These notches might be weakening the part to a point where it will easily brake and be ineffective, reason why I am planning on a duplicate (no notches) installed on top of it.

  Comments, anyone?Carlos  CH601-HDhttp://www.zenith.aero/photo/img-6037  

  [quote][b]

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psm(at)att.net
Guest

Posted: Sun Jun 10, 2012 5:22 pm Post subject: upper bearing

Hi Carlos,

     

     I didn't look at the referenced documents, but I think I understand     what you are doing.

     

     First, I would use nylon rather than UHMWPE plastic for this     application.  Polyethylene is nice cheap plastic but it is not very     wear resistant.  This is a high wear area - it has steel rubbing on     plastic whenever the nose gear moves up or down - so some really     high tech plastic is called for.  Nylon or Nyloil (oil bearing     nylon) would be a better choice.  I don't think the oil matters in     this case because the movement is quite slow in most cases.

     

     Second, I would make sure the nose gear column has a lot of     clearance from the plastic bearing before getting it all put     together.  I would suggest at least .010 inches (.2 mm) clearance     after the nose gear column is painted.  This must be able to rotate     freely to get the silly full flying rudder to point in the right     direction when the pins are engaged by the V-blocks in the bottom     bearing.

     

     Paul

     Camas, WA

     XL in phase I flight test.

     

     On 6/10/2012 3:13 PM, Carlos Sa wrote:     [quote]Hello, all                     I am working on the (CH601-HD)         firewall, and I am doing some changes based on the XL and the         750 firewall.              The addition of the plastic upper         bearing is causing me a bit of concern.       In my case, the bearing         interferes with rivets placed through 6F10-2 (the original         CH601-HD upper bearing) and 6F8-2 (firewall stiffener).       These parts can be sen on page 11         of this document: http://www.zenithair.com/pdf-doc/601-firewall-gear-rib.pdf       I am using UHDMW (or some such         mix of letters) 3/8" thick.       I cut notches to clear the         rivets.              What is bugging me is that I         could not find any comments about this interference, so maybe I         am doing something incredibly wrong (I am not content with doing         anything just "credibly" wrong).       My "notched" upper bearing can be         seen here: http://www.flickr.com/photos/54366879(at)N06/7359287022/       These notches might be weakening         the part to a point where it will easily brake and be         ineffective, reason why I am planning on a duplicate (no         notches) installed on top of it.

              Comments, anyone?                     Carlos       CH601-HD       http://www.zenith.aero/photo/img-6037       

       

       

        	  Quote: 	
		  

	
     [b]

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