Today's Message Index:
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1. 04:21 PM - upper bearing (Carlos Sa)
2. 06:22 PM - Re: upper bearing (Paul Mulwitz)
Message 1
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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@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
Message 2
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| Subject: | Re: 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:
> 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@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
>
>
> *
>
>
> *
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