Original Posted By: "danoliver"
I have some good 1/16 aircraft plywood. I am in need of 1/8. Is it okay to epoxytwo 1/16 sheets together to make 1/8?--------John FrancisRead this topic online here:http://forums.matronics.com/viewtopic.p ... ___Subject: Pietenpol-List: welding 4130 hinges
Pietenpol-List: welding 4130 hinges
Original Posted By: "CatDesigns"
Has anyone had any trouble with brittle welds? I am new to all of this so don'trule out rookie error. I have spent the last couple weeks trying to fab the empennagehinges to no avail. I am using .090 4130 steel from AS&S and an oxy/acetylenewelder. My welds are easily broken and when you look at the breaks theylook crystalline. As an experiment I decided to try several methods of simplywelding two flat pieces of steel together including; preheating, postheating,reheating, over penetration, under penetration, filler rod, and no filler rod.All with the same result, I can bend them to about 30 degrees and then theysnap. The worst part is that I can grab any piece of scrap steel laying aroundmy garage, cut it in half, and weld it back together with ease. Is there somespecial procedure needed to weld 4130? Do I even need to use 4130? Bernarddoesn't call for it in the plans.Please help.--------Dan ORead this topic online here:http://forums.matronics.com/viewtopic.p ... __________
Has anyone had any trouble with brittle welds? I am new to all of this so don'trule out rookie error. I have spent the last couple weeks trying to fab the empennagehinges to no avail. I am using .090 4130 steel from AS&S and an oxy/acetylenewelder. My welds are easily broken and when you look at the breaks theylook crystalline. As an experiment I decided to try several methods of simplywelding two flat pieces of steel together including; preheating, postheating,reheating, over penetration, under penetration, filler rod, and no filler rod.All with the same result, I can bend them to about 30 degrees and then theysnap. The worst part is that I can grab any piece of scrap steel laying aroundmy garage, cut it in half, and weld it back together with ease. Is there somespecial procedure needed to weld 4130? Do I even need to use 4130? Bernarddoesn't call for it in the plans.Please help.--------Dan ORead this topic online here:http://forums.matronics.com/viewtopic.p ... __________
RE: Pietenpol-List: welding 4130 hinges
Original Posted By: owner-pietenpol-list-server(at)matronics.com
DanI'm not an expert but I have done all the welding on my Pietenpol using Oxyfuel. Typically 4130 welds easily. The only time I have gotten brittlewelds is when I over heat the weld. Questions I can think of.Are you sure you have a soft neutral flame?Are you using too small of a tip so it takes a lot of heat to start the weldpuddle thus over heating the metal or too big of a tip so it heats reallyfast and over heats the metal? What welding rod are you using?ChrisSacramento, CAWestcoastPiet.com-----Original Message-----
DanI'm not an expert but I have done all the welding on my Pietenpol using Oxyfuel. Typically 4130 welds easily. The only time I have gotten brittlewelds is when I over heat the weld. Questions I can think of.Are you sure you have a soft neutral flame?Are you using too small of a tip so it takes a lot of heat to start the weldpuddle thus over heating the metal or too big of a tip so it heats reallyfast and over heats the metal? What welding rod are you using?ChrisSacramento, CAWestcoastPiet.com-----Original Message-----
RE: Pietenpol-List: welding 4130 hinges
Original Posted By: owner-pietenpol-list-server(at)matronics.com
Also if you cool the metal to fast it will become very brittle and can brakeeasy. The metal must cool at room temp.Jerry Sky Classic Aircraft-----Original Message-----
Also if you cool the metal to fast it will become very brittle and can brakeeasy. The metal must cool at room temp.Jerry Sky Classic Aircraft-----Original Message-----
Pietenpol-List: Re: welding 4130 hinges
Original Posted By: Ray Krause
I've tried RG45 and ER70S-2 rods. Used Victor # 00, 0, and 1 tips. I even followedBingelis's advice about not letting my dog wag his tail. All with the sameresult - nice looking but easily broken welds. I'll try some more this Sundaywith your advice in mind. Thanks.--------Dan ORead this topic online here:http://forums.matronics.com/viewtopic.p ... __________
I've tried RG45 and ER70S-2 rods. Used Victor # 00, 0, and 1 tips. I even followedBingelis's advice about not letting my dog wag his tail. All with the sameresult - nice looking but easily broken welds. I'll try some more this Sundaywith your advice in mind. Thanks.--------Dan ORead this topic online here:http://forums.matronics.com/viewtopic.p ... __________
Pietenpol-List: Re: welding 4130 hinges
Original Posted By: "womenfly2"
have over a hundred hours in a Piper PA-11 with a C-90, all started by solo handprop. Easiest engine I have propped too.On 3/5/2016 4:59 PM, Douwe Blumberg wrote:>> Tom Wottreng built my C90 and is an awesome engine builder and > all-around nice guy to do business with, and now a friend. And he > really knows Piets and what engines they like.>> No reason one cant have a C90 without a starter. Just sayin>> Douwe>> No virus found in this message.> Checked by AVG - www.avg.com >-- Charles BurkholderVisit my blog @ http://missionmechfund.blogspot.ca/____ ... ___Subject: Pietenpol-List: Re: welding 4130 hinges
have over a hundred hours in a Piper PA-11 with a C-90, all started by solo handprop. Easiest engine I have propped too.On 3/5/2016 4:59 PM, Douwe Blumberg wrote:>> Tom Wottreng built my C90 and is an awesome engine builder and > all-around nice guy to do business with, and now a friend. And he > really knows Piets and what engines they like.>> No reason one cant have a C90 without a starter. Just sayin>> Douwe>> No virus found in this message.> Checked by AVG - www.avg.com >-- Charles BurkholderVisit my blog @ http://missionmechfund.blogspot.ca/____ ... ___Subject: Pietenpol-List: Re: welding 4130 hinges
Pietenpol-List: Re: welding 4130 hinges
Original Posted By: "DaveG601XL"
Thanks Terry. Those were pretty interesting links, and looked to be from same timeperiod. I guess there were probably hundreds of those type books published,and many in small batches. I guess I may never find out exactly what I have.--------Jon JonesIronton, MORead this topic online here:http://forums.matronics.com/viewtopic.p ... ___Subject: Pietenpol-List: Re: welding 4130 hinges
Thanks Terry. Those were pretty interesting links, and looked to be from same timeperiod. I guess there were probably hundreds of those type books published,and many in small batches. I guess I may never find out exactly what I have.--------Jon JonesIronton, MORead this topic online here:http://forums.matronics.com/viewtopic.p ... ___Subject: Pietenpol-List: Re: welding 4130 hinges
Original Posted By: "Ralph"
Dan,I am glad Russ M. was able to help you out. Have you met with John M. yet? Bothare good welders. Bring some of your most recent test pieces to the next chaptermeeting and we will give them a look over. Russ and I would like to cometo your shop sometime and check out your progress over the summer.Good luck,--------David GallagherZodiac 601 XL-B: flying, 280+ hours nowNext project under construction: Finish my father's AircamperRead this topic online here:http://forums.matronics.com/viewtopic.p ... __________
Dan,I am glad Russ M. was able to help you out. Have you met with John M. yet? Bothare good welders. Bring some of your most recent test pieces to the next chaptermeeting and we will give them a look over. Russ and I would like to cometo your shop sometime and check out your progress over the summer.Good luck,--------David GallagherZodiac 601 XL-B: flying, 280+ hours nowNext project under construction: Finish my father's AircamperRead this topic online here:http://forums.matronics.com/viewtopic.p ... __________
Pietenpol-List: Re: welding 4130 hinges
Original Posted By: "Bill Church"
Subject: Re: Pietenpol-List: turnbucklesYour turnbuckle may be old German. 32 tpi is 0.8 mm pitch, which is thethread pitch for metric 5 screw. I also have a couple of those turnbucklesfrom an old Fokker biplane. I also have one larger, metric 6 with 1.0 mmpitch. They don't mix with AN hardware.Hope this answers your question.Semih=8BOn Thu, Apr 7, 2016 at 11:23 PM, Jack wrote:> Ralph I did the same thing. I've heard some of the older sets threads> varied. It was important to keep them together as matched sets...>> Sent from my iPad> Jack Textor>> On Apr 7, 2016, at 2:53 PM, Ralph wrote:>> Early on in my Piet build I bought a large number of used turnbuckles at> Oshkosh. A couple years ago I took one of the end forks with me to Oshkosh> to be sure and get the correct size pins for the fork end. Now that I am> assembling the tail pieces I find I have misplaced the fork end to one of> the turnbuckles. I located a supple of used turnbuckles locally but can=99t> find one of the same thread pitch. I found one of the same diameter but> only about 4 threads will fit into the barrel. Under a microscope I count> 30 threads per inch on the type fork I need to replace. The used one I> found has 32 threads per inch as does the forks available from Aircraft> Spruce. Is it possible the used turnbuckles I got years ago at Oshkosh are> a military spec which is different than the thread spec currently used on> civilian aircraft? I will be able to replace the entire turnbuckle unit> but I am curious about the 2 threads per inch difference in the forks.> Anybody have any explanation?>> Ralph in SD>>-- Semih Oksay________________________________________________________________________________Subject: Pietenpol-List: Re: welding 4130 hinges
Subject: Re: Pietenpol-List: turnbucklesYour turnbuckle may be old German. 32 tpi is 0.8 mm pitch, which is thethread pitch for metric 5 screw. I also have a couple of those turnbucklesfrom an old Fokker biplane. I also have one larger, metric 6 with 1.0 mmpitch. They don't mix with AN hardware.Hope this answers your question.Semih=8BOn Thu, Apr 7, 2016 at 11:23 PM, Jack wrote:> Ralph I did the same thing. I've heard some of the older sets threads> varied. It was important to keep them together as matched sets...>> Sent from my iPad> Jack Textor>> On Apr 7, 2016, at 2:53 PM, Ralph wrote:>> Early on in my Piet build I bought a large number of used turnbuckles at> Oshkosh. A couple years ago I took one of the end forks with me to Oshkosh> to be sure and get the correct size pins for the fork end. Now that I am> assembling the tail pieces I find I have misplaced the fork end to one of> the turnbuckles. I located a supple of used turnbuckles locally but can=99t> find one of the same thread pitch. I found one of the same diameter but> only about 4 threads will fit into the barrel. Under a microscope I count> 30 threads per inch on the type fork I need to replace. The used one I> found has 32 threads per inch as does the forks available from Aircraft> Spruce. Is it possible the used turnbuckles I got years ago at Oshkosh are> a military spec which is different than the thread spec currently used on> civilian aircraft? I will be able to replace the entire turnbuckle unit> but I am curious about the 2 threads per inch difference in the forks.> Anybody have any explanation?>> Ralph in SD>>-- Semih Oksay________________________________________________________________________________Subject: Pietenpol-List: Re: welding 4130 hinges