---------------------------------------------------------- Zenith701801-List Digest Archive --- Total Messages Posted Fri 07/10/09: 7 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 01:46 AM - Re: 701 fuel system design (jetboy) 2. 08:50 AM - Re: bending MLG spring with heat (bryanekholm) 3. 11:06 AM - Re: bending MLG spring with heat (Tom P) 4. 12:52 PM - Re: Re: bending MLG spring with heat (Roy Szarafinski) 5. 02:01 PM - Re: bending MLG spring with heat (Tom P) 6. 06:48 PM - Re: bending MLG spring with heat (d.shrader) 7. 06:49 PM - Re: 701 fuel system design (d.shrader) ________________________________ Message 1 _____________________________________ Time: 01:46:36 AM PST US Subject: Zenith701801-List: Re: 701 fuel system design From: "jetboy" I added some photos of my plumbing here: http://www.zenith.aero/profile/RalphSanson?xg_source=profiles_memberList Ralph -------- Ralph - CH701 / 2200a Read this topic online here: http://forums.matronics.com/viewtopic.php?p=252410#252410 ________________________________ Message 2 _____________________________________ Time: 08:50:05 AM PST US Subject: Zenith701801-List: Re: bending MLG spring with heat From: "bryanekholm" I will be bending my 701 main gear in the near future also, so this post interests me. Any tips or suggestions from those who have already been through the process would be greatly appreciated. One question I have is: Do you add or subtract degrees for spring-back when the gear is bent while heated as opposed to it being bent cold? Bryan Ekholm -------- Bryan Ekholm Read this topic online here: http://forums.matronics.com/viewtopic.php?p=252440#252440 ________________________________ Message 3 _____________________________________ Time: 11:06:29 AM PST US Subject: Zenith701801-List: Re: bending MLG spring with heat From: "Tom P" 6061 aluminum comes in different heat treated conditions. The first is 6061-0 which is easiest to bend then the solution heat treated 6061-T4 and then the aged after T4 to T6 condition which is the hardest and strongest conditions. By heating the aluminum you may be altering the T6 condition either back to 0 condition or something between that. I would suggest calling your local heat treat shop and have it re-heat treated back to T6 condition because you don't want stress differences by having different tempers in your spring gear. My 801 gear is T651 which is T4 stress relieved and then straightened and then aged to T6. I personally wouldn't take any chances on landing gear not being the right T6 temper at minimum and preferably T651. Typically heat treating aluminum takes several hours at about 950F or higher and then it is water/brine quenched giving it the T4 condition and still somewhat workable. Followed by another aging process at around 500F for a few hours. After the aging it is in T6 condition and ready to be your spring. It is also important to make sure of the grade of your aluminum so the heat treater can use the proper processing temperatures. Then again maybe Zenith just heats the spot up to bend and thats the end of that?????? If anyone knows what Zenith does please jump in. -------- Tom CH801 Dynon D180 Lycoming IO-360 From Teledyne Mattituck http://home.cogeco.ca/~tomp Read this topic online here: http://forums.matronics.com/viewtopic.php?p=252451#252451 ________________________________ Message 4 _____________________________________ Time: 12:52:48 PM PST US From: Roy Szarafinski Subject: Re: Zenith701801-List: Re: bending MLG spring with heat T-6 etc, all true. Zac bends the 701 gear cold, I asked a couple years ago at Osh. I bent mine cold, figured it out after a couple of test pieces. Roy ----- Original Message ---- From: Tom P Sent: Friday, July 10, 2009 2:06:00 PM Subject: Zenith701801-List: Re: bending MLG spring with heat 6061 aluminum comes in different heat treated conditions. The first is 6061-0 which is easiest to bend then the solution heat treated 6061-T4 and then the aged after T4 to T6 condition which is the hardest and strongest conditions. By heating the aluminum you may be altering the T6 condition either back to 0 condition or something between that. I would suggest calling your local heat treat shop and have it re-heat treated back to T6 condition because you don't want stress differences by having different tempers in your spring gear. My 801 gear is T651 which is T4 stress relieved and then straightened and then aged to T6. I personally wouldn't take any chances on landing gear not being the right T6 temper at minimum and preferably T651. Typically heat treating aluminum takes several hours at about 950F or higher and then it is water/brine quenched giving it the T4 condition and still somewhat workable. Followed by another aging process at around 500F for a few hours. After the aging it is in T6 condition and ready to be your spring. It is also important to make sure of the grade of your aluminum so the heat treater can use the proper processing temperatures. Then again maybe Zenith just heats the spot up to bend and thats the end of that?????? If anyone knows what Zenith does please jump in. -------- Tom CH801 Dynon D180 Lycoming IO-360 From Teledyne Mattituck http://home.cogeco.ca/~tomp Read this topic online here: http://forums.matronics.com/viewtopic.php?p=252451#252451 ________________________________ Message 5 _____________________________________ Time: 02:01:59 PM PST US Subject: Zenith701801-List: Re: bending MLG spring with heat From: "Tom P" Here is some extra information regarding heating the aluminum! http://en.allexperts.com/q/Metallurgy-2280/6061-T6-Aluminum-lose.htm -------- Tom CH801 Dynon D180 Lycoming IO-360 From Teledyne Mattituck http://home.cogeco.ca/~tomp Read this topic online here: http://forums.matronics.com/viewtopic.php?p=252480#252480 ________________________________ Message 6 _____________________________________ Time: 06:48:28 PM PST US Subject: Zenith701801-List: Re: bending MLG spring with heat From: "d.shrader" rvickski(at)yahoo.com wrote: > T-6 etc, all true. Zac bends the 701 gear cold, I asked a couple years ago at Osh. I bent mine cold, figured it out after a couple of test pieces. > Roy > > --- Roy can you give some information on your method of bending? I need all the help i can get on bending up such a thick chunk of material. thanks Dave Read this topic online here: http://forums.matronics.com/viewtopic.php?p=252517#252517 ________________________________ Message 7 _____________________________________ Time: 06:49:19 PM PST US Subject: Zenith701801-List: Re: 701 fuel system design From: "d.shrader" jetboy wrote: > I added some photos of my plumbing here: > > http://www.zenith.aero/profile/RalphSanson?xg_source=profiles_memberList > > > Ralph Ralph thankyou for your help dave Read this topic online here: http://forums.matronics.com/viewtopic.php?p=252518#252518 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message zenith701801-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Zenith701801-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/zenith701801-list Browse Digests http://www.matronics.com/digest/zenith701801-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.