boji

Re: DIY API 1604 inspired mixer (16x8x2)
« Reply #40 on: March 25, 2020, 02:46:11 AM »
Small update--  After mixed results using a brake for backplane brackets, going to instead try the brazing route.  Picts to follow after stuff arrives and I've got acquainted with the process.



Some bent fine, some didn't. Didn't feel like doing cutting and measuring each piece only to gamble on the bend not turning into this:


Edit: In retrospect, preheating the bend would have probably produced the results wanted, but the next method will hopefully look better and make for stronger brackets.
« Last Edit: March 25, 2020, 07:47:20 PM by boji »


Gold

Re: DIY API 1604 inspired mixer (16x8x2)
« Reply #41 on: March 25, 2020, 11:43:36 AM »
, going to instead try the brazing route.  Picts to follow after stuff arrives and I've got acquainted with the process.


I’m interested to see that.

fazer

Re: DIY API 1604 inspired mixer (16x8x2)
« Reply #42 on: March 26, 2020, 11:12:14 PM »
Quote
I’m interested to see that.

+1

boji

Re: DIY API 1604 inspired mixer (16x8x2)
« Reply #43 on: March 26, 2020, 11:41:59 PM »
Ok...first try was...bad. Learned proper aluminum temp is sneaky tricky!  The way to determine proper temp is as follows: Absent direct torch heat, If dragging the rod across the metal seam to be brazed makes the rod melt, you've got the aluminum at the right temp.

Alloy rods melt at 700°F.   Aluminum melts at roughly 1200°F.  Aluminum oxide melts at much higher temp (3,762°F!)  so with thicker gauges, you can have a piece hold its shape in spongy fashion, but inside, beneath the oxide, it's liquifying!



After few failures, poor application on test pieces, first success pic below, prior to cleanup.



Ok after cleanup, this looks decent... not bad for a 'dry' application.  All about creating a 'V' divot in the joint, making sure seam is oxide free and acetone cleaned before laying-in filler:


Finished test pair.  They'd  work fine going in the console, but they are kinda ugly, and I'd prefer to wait for attempts with flux. 


I'm guessing flux will make joints look nicer with less post cleanup, and wick better for more strength.


« Last Edit: March 27, 2020, 04:10:59 PM by boji »

Gold

Re: DIY API 1604 inspired mixer (16x8x2)
« Reply #44 on: March 27, 2020, 12:18:34 PM »
What are you using to heat the metal??

Squeaky

Re: DIY API 1604 inspired mixer (16x8x2)
« Reply #45 on: March 27, 2020, 03:31:41 PM »
Taking it to the next level Boji. You have my admiration.

boji

Re: DIY API 1604 inspired mixer (16x8x2)
« Reply #46 on: March 28, 2020, 01:59:12 AM »
Quote
What are you using to heat the metal??
Standard propane torch.  MAP-Pro gas produces a hotter flame,  but 4x the price per bottle.


Ceramic tiles reduce heat absorption into the vice somewhat.


So, flux does help a little if dropped into seam at the right point and temperature. But it also comes with its own set of problems, as it can pull bead out and create a thin braze. It can also be overused and create a hard shell which requires chisling, sanding and use of a grinder to produce a clean finish.

When it's all dialed in, you get a fairly solder-like finish:


Quote
Taking it to the next level Boji
Thanks squeaky, trying my best to not cut corners, inside and out.

scott2000

Re: DIY API 1604 inspired mixer (16x8x2)
« Reply #47 on: March 28, 2020, 02:10:34 AM »
Thanks for sharing all this!

boji

Re: DIY API 1604 inspired mixer (16x8x2)
« Reply #48 on: March 30, 2020, 05:37:31 AM »
Quote
Thanks for sharing all this!
You're quite welcome, least I can do.

So...feels like cheating to powdercoat over uglier brazes, but will add a sense of consistency...should anyone EVER decide to peer into 500 slot bay to look at support metalwork.  ::) ::)





fazer

Re: DIY API 1604 inspired mixer (16x8x2)
« Reply #49 on: March 30, 2020, 12:23:01 PM »
Finished looks good.

My brother is a welder and talks about how a 100 amp welder is needed for aluminum because of its dissipative quality’s .   It takes an amazing amount of heat wherever the weld is. 


boji

Re: DIY API 1604 inspired mixer (16x8x2)
« Reply #50 on: March 30, 2020, 03:45:20 PM »
Quote
It takes an amazing amount of heat

Aint kidding.  Also  turns out the flux localizes the heat fast, so if temps are not just right, the flux pits the aluminum while I'm trying to add filler rod.  Real pain/art to it.

ruffrecords

Re: DIY API 1604 inspired mixer (16x8x2)
« Reply #51 on: March 30, 2020, 06:02:16 PM »
Aint kidding.  Also  turns out the flux localizes the heat fast, so if temps are not just right, the flux pits the aluminum while I'm trying to add filler rod.  Real pain/art to it.

Aluminium is possibly the worst material to braze or weld. I take my hat off to you. Have you thought about using brass?

Cheers

Ian
www.customtubeconsoles.com
https://mark3vtm.blogspot.co.uk/
www.eztubemixer.blogspot.co.uk


'The only people not making mistakes are the people doing nothing'


 

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