This one. Cotronic fins before sanding. On Thu, Nov 29, 2012 at 11:46 PM, James Dougherty <jafrado@xxxxxxxxx> wrote: > I really like this shot. The Jager meister is a nice touch. > > > On Thu, Nov 29, 2012 at 11:44 PM, James Dougherty <jafrado@xxxxxxxxx>wrote: > >> LOL, yeah, me too. But CF is a real mess! Not sure I would want the >> splinters! >> >> I just think if you're gonna go through all that effort, why put G10 on >> it, >> otherwise use solid aluminum or G10 fins :-) >> >> So, sounds like you're having fun with it... >> >> Maybe try it with some plywood then, it won't be so heavy but would be a >> really >> strong and fun to finish! >> >> Here's a picture of the M150 under vacuum, then peeled before sanding. >> >> I'm doing my M165 this year the same way, maybe you should camp out and >> we will do a few "peel sessions" :-) >> >> >> >> On Thu, Nov 29, 2012 at 10:38 PM, R Dierking >> <applerocketry@xxxxxxxxxxx>wrote: >> >>> If I worked at at place like Dragonplate, I would need a really big >>> lunch box - you know, for those scrap pieces ;-) >>> Oh well, I'm using a sheet of 1/8" thick aluminum I bought at a scrap >>> yard at $5.25 per pound, and left over G-10. Not that I'm cheap (insert >>> joke here); just want to see if I can build something with this stuff. I'm >>> not even sure if it will save weight. >>> I will get the itching kit to see how it works. >>> >>> I would be interested in the vacuum set-up. Would you please post some >>> photos? >>> Richard >>> >>> Sent from my iPad >>> >>> On Nov 29, 2012, at 9:50 PM, "James Dougherty" <jafrado@xxxxxxxxx> >>> wrote: >>> >>> I think I would break down and buy the whole sheet :-) >>> http://dragonplate.com/ecart/categories.asp?cID=65 >>> >>> >>> On Thu, Nov 29, 2012 at 8:49 PM, James Dougherty <jafrado@xxxxxxxxx>wrote: >>> >>>> Sorry, 1/32" thick G-10 Garolite >>>> >>>> http://dragonplate.com/ecart/product.asp?pID=3925&cID=93 >>>> >>>> Ouch, pricy, I know ... >>>> >>>> But If you could design the fins to fit those sheets... man oh man. >>>> >>>> >>>> On Thu, Nov 29, 2012 at 8:46 PM, James Dougherty <jafrado@xxxxxxxxx>wrote: >>>> >>>>> Richard, >>>>> What laminates are you using? >>>>> I have a vacuum setup I am not using if you want to borrow it. >>>>> -james >>>>> >>>>> >>>>> On Thu, Nov 29, 2012 at 8:36 PM, James Dougherty <jafrado@xxxxxxxxx>wrote: >>>>> >>>>>> Actually, Richard, disregard, Cotronics is not what you need for this >>>>>> - I see what you are doing. >>>>>> >>>>>> http://www.jamestowndistributors.com/userportal/show_product.do?pid=12214 >>>>>> >>>>>> It's an acid wash which chemically alters the surface as you've >>>>>> described. >>>>>> >>>>>> Very cool! Can you send us a full report? >>>>>> >>>>>> >>>>>> On Thu, Nov 29, 2012 at 8:30 PM, James Dougherty >>>>>> <jafrado@xxxxxxxxx>wrote: >>>>>> >>>>>>> That's exactly what it is, like an etching primer you use for metal. >>>>>>> >>>>>>> Get some Cotronics 4540 Machinable aluminum or 4525. I have some >>>>>>> I can give you one at the next launch if you need like pre-kitted 2 >>>>>>> oz batches ;-) >>>>>>> >>>>>>> >>>>>>> On Thu, Nov 29, 2012 at 6:09 PM, R Dierking < >>>>>>> applerocketry@xxxxxxxxxxx> wrote: >>>>>>> >>>>>>>> I'm thinking it's acid based to chemically etch the material and >>>>>>>> also a film so the aluminum will not oxidize immediately when exposed >>>>>>>> again >>>>>>>> to the air. Some people use wet sanding of the aluminum to prevent the >>>>>>>> oxidation layer that prevents good bonding. For this technique, slow >>>>>>>> cure >>>>>>>> epoxy (30 minute) is used and the aluminum surface is wet sanded with >>>>>>>> the >>>>>>>> epoxy. I know, it sounds like a big mess, but it works! >>>>>>>> >>>>>>>> For my application, I'm looking to bond 1/8" thick aluminum between >>>>>>>> sheets of 1/32" thick G-10 Garolite for fins. The attached photo >>>>>>>> shows the >>>>>>>> aluminum test peice. >>>>>>>> >>>>>>>> Anyway, I'm probably going to try the West Systems Aluminum Etch on >>>>>>>> some test pieces and see if I can pull the layers apart. >>>>>>>> >>>>>>>> Richard Dierking >>>>>>>> ------------------------------ >>>>>>>> Subject: [tccrockets] Re: Bonding Aluminum to Fiberglass >>>>>>>> From: bandman444@xxxxxxxxx >>>>>>>> Date: Thu, 29 Nov 2012 17:31:47 -0800 >>>>>>>> To: tccrockets@xxxxxxxxxxxxx >>>>>>>> >>>>>>>> >>>>>>>> I don't, when we bonded the aluminum fins to our N5800 rocket we >>>>>>>> used LOCtite Hysol 9430 and used a sanding while epoxy on approach. It >>>>>>>> held >>>>>>>> to Mach 3 so I guess it was ok. >>>>>>>> >>>>>>>> The West Systems kit looks interesting. >>>>>>>> >>>>>>>> Bryce Chanes >>>>>>>> >>>>>>>> Sent from my iPhone >>>>>>>> >>>>>>>> On Nov 29, 2012, at 4:51 PM, R Dierking <applerocketry@xxxxxxxxxxx> >>>>>>>> wrote: >>>>>>>> >>>>>>>> Does anyone have experience using the West Systems 860-8 aluminum >>>>>>>> etch kit for bonding aluminum to fiberglass? >>>>>>>> >>>>>>>> Richard Dierking >>>>>>>> >>>>>>>> >>>>>>> >>>>>> >>>>> >>>> >>> >> >
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