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carlossa52(at)gmail.com
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 Posted: Sun Jun 10, 2012 3:18 pm Post subject: upper bearing |
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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
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craig(at)craigandjean.com
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| Posted: Sun Jun 10, 2012 5:32 pm Post subject: upper bearing |
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Short answer: don’t’ worry
Long answer: Don’t worry for a number of reasons:
- Try and break a sample of that material. Clamp half the length in a vise, put an adjustable wrench on the other half and bend it at a 90 degree angle.
- it is a bearing, not a structural element. The side load is relatively small and spread across the thickness of the material. And the load is trying to compress or elongate the material, not split it.
- I did the same (but only for two rivets as I recall)
- I only see two bolt holes in your bearing, On the 601XL and 701 there are four. See here:
http://www.zenithair.com/zodiac/xl/data/6-b-07.pdf
This being the Internet someone will immediately disagree with me.
-- Craig
From: owner-zenith-list-server(at)matronics.com [mailto:owner-zenith-list-server(at)matronics.com] On Behalf Of Carlos Sa
Sent: Sunday, June 10, 2012 3:14 PM
To: zenith-list(at)matronics.com; zenith601-list(at)matronics.com; zenith750-list(at)matronics.com
Subject: upper bearing
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
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01234567
[quote][b]
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n801bh(at)netzero.com
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| Posted: Sun Jun 10, 2012 5:38 pm Post subject: upper bearing |
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Nice job on carving the piece out..... Altho it does like kinda fragile , that stuff is tough and properly fastened it will perform perfectly... IMHO.
do not archive
Ben Haas
N801BH
www.haaspowerair.com
--------
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larrycmcfarland(at)gmail.
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| Posted: Sun Jun 10, 2012 7:29 pm Post subject: upper bearing |
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Hi Carlos,
I had the same situation concerning fracture of the plastic which occurred at my nose gear bearings. To reduce the possibility of
Compression fracture, I added an aluminum shim that spread the compression of the fasteners that held the piece in place. It worked.
Also the holes for rivets could just as well have been a soft gasket material between the bearing and the support to take up the thickness
of the rivet heads or bottoms. If these were pulled rivets, it might be better to revert to using compression rivets to thin the impressions.
See link, www.macsmachine.com/images/gear/full/upbrg.gif
Larry McFarland 601HDS at www.macsmachine.com
From: owner-zenith-list-server(at)matronics.com [mailto:owner-zenith-list-server(at)matronics.com] On Behalf Of Carlos Sa
Sent: Sunday, June 10, 2012 5:14 PM
To: zenith-list(at)matronics.com; zenith601-list(at)matronics.com; zenith750-list(at)matronics.com
Subject: upper bearing
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: | | http://www.matronics.com/Navigator?Zenith-List |
01234567
[quote][b]
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carlossa52(at)gmail.com
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| Posted: Sun Jun 10, 2012 7:46 pm Post subject: upper bearing |
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Hello, LarryYou make good points.I like the idea of solid rivets - I could also set the (pop) rivet from inside, but getting the riveter in that tight space might be a problem. A solid rivet, installed with a squeezer, would work nicely...And once again, I owe you one! Actually, I owe you two: I just finished bending the upper longerons using your setup.I even managed to get the same wheels as the one you used. It worked beautifully!Best Carlos
On 10 June 2012 23:27, Larry McFarland <larrycmcfarland(at)gmail.com (larrycmcfarland(at)gmail.com)> wrote:
[quote]
Hi Carlos,
I had the same situation concerning fracture of the plastic which occurred at my nose gear bearings. To reduce the possibility of
Compression fracture, I added an aluminum shim that spread the compression of the fasteners that held the piece in place. It worked.
Also the holes for rivets could just as well have been a soft gasket material between the bearing and the support to take up the thickness
of the rivet heads or bottoms. If these were pulled rivets, it might be better to revert to using compression rivets to thin the impressions.
See link, www.macsmachine.com/images/gear/full/upbrg.gif
Larry McFarland 601HDS at www.macsmachine.com
From: owner-zenith-list-server(at)matronics.com (owner-zenith-list-server(at)matronics.com) [mailto:owner-zenith-list-server(at)matronics.com (owner-zenith-list-server(at)matronics.com)] On Behalf Of Carlos Sa
Sent: Sunday, June 10, 2012 5:14 PM
To: zenith-list(at)matronics.com (zenith-list(at)matronics.com); zenith601-list(at)matronics.com (zenith601-list(at)matronics.com); zenith750-list(at)matronics.com (zenith750-list(at)matronics.com)
Subject: upper bearing
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
0 12345 67
8
[b]
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zodiac601
Joined: 11 Jul 2011
Posts: 7
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| Posted: Tue Jun 12, 2012 8:15 am Post subject: Re: upper bearing |
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The round stop plate doesn't sit flat on the shelf. It seems like this is going to cause issues keeping the rudder centered.
What has everyone done to resolve this?
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psm(at)att.net
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| Posted: Tue Jun 12, 2012 8:48 am Post subject: upper bearing |
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I saw an older XL and observed the nose gear column extended several
inches above the firewall shelf. This means the stop on the end of the
column never gets near the shelf.
On mine, the round stop plate did indeed hit the shelf and this
prevented the pins from fully engaging the v-block at the bottom of the
nose gear column. I was able to fix this by adding an additional nylon
spacer between the steel tube and the aluminum stop plate. My total
addition was only about 1/8 inch.
Paul
On 6/12/2012 9:15 AM, zodiac601 wrote:
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zodiac601
Joined: 11 Jul 2011
Posts: 7
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| Posted: Tue Jun 12, 2012 10:09 am Post subject: Re: upper bearing |
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When in flight, my top stop plate will always rub on the shelf. I guess you are saying I should make spacers to provide clearance? I never thought of a spacer but that would solve the problem.
In Craig's link above, you can see the plate on page 7 of the guide.
I think many people with rudder centering issues and hard pedal force are probably experiencing what I am but don't think about the nose gear being fully extended in flight.
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bryanmmartin
Joined: 10 Jan 2006
Posts: 1018
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| Posted: Tue Jun 12, 2012 3:59 pm Post subject: upper bearing |
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The rudder cable tension will increase with no weight on the nose-wheel because of the geometry of the firewall. Set your rudder cable tension with no weight on the nose wheel. I had a fairly high rudder force until I realized that the eighth inch of compression of the nose-wheel bungee was reducing the cable tension by a 33% or so.
On Jun 12, 2012, at 1:09 PM, zodiac601 wrote:
| Quote: |
When in flight, my top stop plate will always rub on the shelf. I guess you are saying I should make spacers to provide clearance? I never thought of a spacer but that would solve the problem.
In Craig's link above, you can see the plate on page 7 of the guide.
I think many people with rudder centering issues and hard pedal force are probably experiencing what I am but don't think about the nose gear being fully extended in flight.
|
--
Bryan Martin
N61BM, CH 601 XL,
RAM Subaru, Stratus redrive.
| | - 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:
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_________________
--
Bryan Martin
N61BM, CH 601 XL, Stratus Subaru.
do not archive. |
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