Re: Basement Floor Bulkhead Repair Aluminum Reply #25 – December 06, 2021, 09:49:58 am Quote from: dsd – December 05, 2021, 10:36:32 pmLen good looking project. I'm sure you have addressed this but be aware to properly ground in multiple locations to prevent electrolysis from getting a start, separate from your attachments? Did you use 6061? Are you going to Alodine?ScottScott, Yes, Beyond the zinc chromate primer on the mating surfaces, I'm going to use MIL-DTL-85054 Amlguard Corrosion Preventitive Compound on the entirety of it (thanks for the PM offer, but, I have similar access to those materials as well). When reinstalling my converter charger I'll do a large bonding/ground strap system than will handle the structure to structure and case grounding of that component. Quote Selected 3 Likes
Re: Basement Floor Bulkhead Repair Aluminum Reply #26 – December 06, 2021, 10:02:42 am WOW!!! impressive work Quote Selected 2 Likes
Re: Basement Floor Bulkhead Repair Aluminum Reply #27 – December 06, 2021, 10:29:18 am Idea,next time someone with skills like that builds one as good as that,ask around,maybe could build an extra for someone with the same size coach. Quote Selected 3 Likes
Re: Basement Floor Bulkhead Repair Aluminum Reply #28 – December 06, 2021, 12:14:23 pm I'm wondering about the difference in temperature expansion rates between aluminum and steel. Is it possible it might effect the glass lamination of the coach sides? Other possibilities?LinearTemperature ExpansionCoefficient- α -(10-6 m/(m °C))Aluminum 21-24Steel 10.8-12.5The cost of aluminum is going to be a lot more than steel.Welding is going to require more than a simple wire feed welder.Corrosion resistance to water with winter treatment chemicals is poor. May be partially mitigated by treatment/coating.Thermal Expansion - Linear Expansion CoefficientsI do appreciate the excellent job done in the construction. First rate!Pierce Quote Selected 1 Likes
Re: Basement Floor Bulkhead Repair Aluminum Reply #29 – December 06, 2021, 12:57:09 pm Here are some good tips and a good read about steel and aluminum protection from the EAA. Quote:Protect your freshly cleaned parts with a suitable primer to prevent further oxidation. 1. Epoxy Primers provide a durable surface that resists most chemicals and is also highly abrasion resistant. 2. Red Oxide Primer, as used in automotive circles, is excellent for use on steel components because of its fast film build, quick dry time, easy sanding, and its ready availability. 3. Zinc Chromate (specification Mil-P-8585A) is preferred by most homebuilders. My favorite corrosion preventative for both aluminum and steel is DuPont's self-etching Variprime™ because it is a good economical base for most types of paint finishes.Full article at EAA site: Rust ProtectionPierce Quote Selected 1 Likes
Re: Basement Floor Bulkhead Repair Aluminum Reply #30 – December 06, 2021, 01:04:40 pm Quote from: John44 – December 06, 2021, 10:29:18 amIdea,next time someone with skills like that builds one as good as that,ask around,maybe could build an extra for someone with the same size coach.IMO. The aluminum part is the easy part. Everything else is quite a project. Bonding the lower skin, filling with pour foam. Vacuum bagging/ bonding upper skin. Len what type of welder are you using? Great project. ScottNote approximately .008 inch difference in 5 meters of length between aluminum and steel with 122 degrees temperature change. Quote Selected 1 Likes
Re: Basement Floor Bulkhead Repair Aluminum Reply #31 – December 06, 2021, 01:09:52 pm Len,I marvel at your skill and willingness to take on this project. The first guy I recall doing it is Don (acousticart) about ten years ago. When he first posted his plan there was shock and disbelief here on the forum. "Get that rig onto a flatbed and into the Foretravel factory! It can't be done! You'll be sorry! You're over your head!" He did it in the gravel in his driveway and it turned out better than the original by far. As our erstwhile Aussie member would say, Good Onya!jor Quote Selected 3 Likes
Re: Basement Floor Bulkhead Repair Aluminum Reply #32 – December 06, 2021, 02:01:50 pm I look at doing the job, and the hardest part would be taking all the stuff out from above the bulkheads. Fuel tank and water,grey and black water tanks etc. I've readDon's write up and it was and awesome job. Quote Selected 4 Likes
Re: Basement Floor Bulkhead Repair Aluminum Reply #33 – December 06, 2021, 02:47:20 pm Quote from: dsd – December 06, 2021, 01:04:40 pmNote approximately .008 inch difference in 5 meters of length between aluminum and steel with 122 degrees temperature change. I get a .096 inch change over 20 feet with a 20 degree F increase in temperature.ResultsMaterial: Custom (α = 20)Change in Length (ΔL): 0.096Final Length (L + ΔL): 240.096Thermal Expansion Calculator | Good Calculators© 2015-2021 goodcalculators.comPierce Quote Selected
Re: Basement Floor Bulkhead Repair Aluminum Reply #34 – December 06, 2021, 04:16:28 pm So based on 5 meter long calculation and a 122F degree temperature change steel grows 3.25MM and aluminum is 5.55MM so a additional 2.3mm extra growth. I'm simply not going to worry about it. You could easily be off that in assembly or more and how could you ever measure anyway. Its also too hot or too cold to measure it . It will be fine. Quote Selected 5 Likes
Re: Basement Floor Bulkhead Repair Aluminum Reply #35 – December 06, 2021, 10:39:33 pm Quote from: dsd – December 06, 2021, 04:16:28 pmSo based on 5 meter long calculation and a 122F degree temperature change steel grows 3.25MM and aluminum is 5.55MM so a additional 2.3mm extra growth. I'm simply not going to worry about it. You could easily be off that in assembly or more and how could you ever measure anyway. Its also too hot or too cold to measure it . It will be fine. Scott,Yep, just not enough to matter. Many associate the increased speed of heat transfer (and relative movement) to mean that the movement/expansion to continue at that rate..and it just doesn't. Aluminum transfers heat (and moves) more quickly, but (in this application) not significantly more.. Quote Selected 2 Likes
Re: Basement Floor Bulkhead Repair Aluminum Reply #36 – December 06, 2021, 10:46:08 pm Quote from: jor – December 06, 2021, 01:09:52 pm When he first posted his plan there was shock and disbelief here on the forum. "Get that rig onto a flatbed and into the Foretravel factory! It can't be done! You'll be sorry! You're over your head!" He did it in the gravel in his driveway and it turned out better than the original by far. jorIt was no mistake that I waited until after I had the new structure built before I posted it here; I've blazed enough vehicle project trails to know that whenever you go your own way, you are going to be challenged. Then everyone looks at it again, and again, and then someone else decides "he might be on to something"...then next thing you know it's routine.. Quote Selected 15 Likes
Re: Basement Floor Bulkhead Repair Aluminum Reply #37 – December 07, 2021, 12:32:57 pm I've also been installing 3M barrier tape as I access upper basement pa els to prevent fuel or water getting into places I don't want a chance of it happening. Photo is it on my slide till I replace bladder seal on order P/n 8663DLScott3M™ Polyurethane Protective Tape 8663DL Transparent Dual Liner, 12 in x 3 yd... Quote Selected 2 Likes
Re: Basement Floor Bulkhead Repair Aluminum Reply #38 – December 07, 2021, 01:25:10 pm Quote from: dsd – December 07, 2021, 12:32:57 pmI've also been installing 3M barrier tape as I access upper basement pa els to prevent fuel or water getting into places I don't want a chance of it happening. Photo is it on my slide till I replace bladder seal on order P/n 8663DLScott3M™ Polyurethane Protective Tape 8663DL Transparent Dual Liner, 12 in x 3 yd...We use the (very similar) 8681 erosion tape on the leading edges of our rudders on the LCAC Hovercraft.. Quote Selected 1 Likes
Re: Basement Floor Bulkhead Repair Aluminum Reply #39 – December 07, 2021, 01:50:25 pm Lol i have a roll of that also. Timed out of course but still good in my world Quote Selected 2 Likes
Re: Basement Floor Bulkhead Repair Aluminum Reply #40 – December 18, 2021, 06:42:48 pm Put a little more time on it this weekend. Quote Selected 20 Likes
Re: Basement Floor Bulkhead Repair Aluminum Reply #41 – December 18, 2021, 06:47:03 pm Beautiful work ! Quote Selected 2 Likes
Re: Basement Floor Bulkhead Repair Aluminum Reply #42 – December 18, 2021, 07:58:58 pm Looks great. Please keep the updates coming. Quote Selected 1 Likes
Re: Basement Floor Bulkhead Repair Aluminum Reply #43 – December 18, 2021, 08:03:07 pm Looking great. Quote Selected 1 Likes
Re: Basement Floor Bulkhead Repair Aluminum Reply #44 – December 18, 2021, 11:00:35 pm Nice job! 👍👍👍 Quote Selected 1 Likes
Re: Basement Floor Bulkhead Repair Aluminum Reply #45 – December 19, 2021, 05:08:22 pm Quote from: len.barron – December 18, 2021, 06:42:48 pmPut a little more time on it this weekend.What is the material held in place with the clecos?ThxTim Quote Selected
Re: Basement Floor Bulkhead Repair Aluminum Reply #46 – December 20, 2021, 06:58:13 pm Quote from: TGordon – December 19, 2021, 05:08:22 pmWhat is the material held in place with the clecos?ThxTimFiberglass Reinforced Plastic (FRP) Panels Quote Selected 5 Likes
Re: Basement Floor Bulkhead Repair Aluminum Reply #47 – December 20, 2021, 08:27:53 pm Love the workmanship. Did you tig or mig weld? Also why aren't you reusing the original skin? I'll have to take care of this job at some point. Quote Selected 1 Likes
Re: Basement Floor Bulkhead Repair Aluminum Reply #48 – December 21, 2021, 09:09:32 am Looks great! I think I would of layed my FRP panels smooth side up, easier cleaning and will not hold in the dirt. Quote Selected 1 Likes
Re: Basement Floor Bulkhead Repair Aluminum Reply #49 – December 21, 2021, 10:55:12 am Quote from: Hammer2100 – December 20, 2021, 08:27:53 pmLove the workmanship. Did you tig or mig weld? Also why aren't you reusing the original skin? I'll have to take care of this job at some point.I just MIG'd them, no need to put in the extra time for TIG in this application, if I was building a fluid system component(or something cosmetic) I'd definitely have TIG'd it . Original skin would have required a lot of hours to clean, and it had some damage from both battery acid and some small impact damage (road debris) so new material was just easier.. Quote Selected 3 Likes
Topic: Basement Floor Bulkhead Repair Aluminum