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Old 12-04-2015, 08:30 PM   #26601
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Thoughts on this technology?
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Old 12-04-2015, 08:33 PM   #26602
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I wrote about that idea for one of my college application essays. I always thought the amount of air needed was far larger than the size of a reasonable tank.
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Old 12-04-2015, 08:34 PM   #26603
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It will break, and be a pain in the ***.
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Old 12-04-2015, 08:35 PM   #26604
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Easy to air up tires.
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Old 12-04-2015, 10:51 PM   #26605
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Indeed, can i use it as a normal compressed air source?
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Old 12-04-2015, 11:05 PM   #26606
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Quote:
Originally Posted by Girz0r View Post
(complicated thing)
I didn't realize that Volvo had been purchased by MBV-Aktiengesellschaft (Mercedes-BMW-Volkswagen Auto Group.)




Does anyone want a box of prestigious journalism awards before I toss them in the bin?

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Old 12-05-2015, 01:16 PM   #26607
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Quote:
Originally Posted by Joe Perez View Post
I didn't realize that Volvo had been purchased by MBV-Aktiengesellschaft (Mercedes-BMW-Volkswagen Auto Group.)




Does anyone want a box of prestigious journalism awards before I toss them in the bin?

I could make use of those (or at least one big phallic one) at work for grins. Shipping to 85234?
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Old 12-05-2015, 02:59 PM   #26608
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Worst bit of engineering i've seen in a while. This bracket is supposed to be held on by mushrooming that bit of aluminum sticking through. But there is no way to support the other side because there is a connector in the way. And it doesn't sit well in a vice. And you can't fit a hammer in that cut out area.

This is a prop valve for a jeep wrangler.



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Old 12-05-2015, 03:13 PM   #26609
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Open vice, put connector between jaws, use a drift and hammer to mushroom aluminum.
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Old 12-05-2015, 03:21 PM   #26610
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Whats a drift?

It kept moving in the vice, and i didn't want to clamp it any harder. Stupid $100 part.

I used a hose clamp
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Old 12-05-2015, 03:48 PM   #26611
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Use a block of steel to make up the difference in height. whats the problem?

Also.


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Old 12-05-2015, 06:24 PM   #26612
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$600 diode failure which ended up smoking the other 2 on it's bank.


Here's what the inside looks like, since i had to crack it up because it welded itself to the copper. Not much going on inside.




















What an expensive day at the office.
This failure also smoked 2 SCR's and 4 fuses before it kicked the 1200a breaker. uggh.
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Old 12-06-2015, 01:14 AM   #26613
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Can it be fused better? Breakers are too slow to save silicon in my experience.
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Old 12-06-2015, 11:36 AM   #26614
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yeah, it uses fast acting fuses. Sometimes they don't always work.

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Old 12-06-2015, 12:26 PM   #26615
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Old 12-06-2015, 01:05 PM   #26616
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Quote:
Originally Posted by hi_im_sean View Post
Can it be fused better? Breakers are too slow to save silicon in my experience.
So are fuses. A silicon part will usually sacrifice itself to protect the fuse which is protecting it.

When you're designing a big, expensive system that has the potential to fail catastrophically on things like overcurrent or overvoltage, you have to take extreme measures to protect it. An active protection circuit will monitor things like load current and source voltage, and forcefully disconnect the supply (and maybe even crowbar across it) if an out-of-tolerance situation occurs.


One of the boards which used to cause me frequent grief at PR&E was a big audio DSP board which had several expensive FPGAs on it. We designed the overvoltage-protection circuit to close a sacrificial SCR between the +48 supply and GND in the event that the 1.8v or 3.3v lines went above spec. It caused the SCR to explode when it tripped, but it saved the big, pricey gate arrays.
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Old 12-07-2015, 11:15 AM   #26617
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Quote:
Originally Posted by aidandj View Post
Worst bit of engineering i've seen in a while. This bracket is supposed to be held on by mushrooming that bit of aluminum sticking through. But there is no way to support the other side because there is a connector in the way. And it doesn't sit well in a vice. And you can't fit a hammer in that cut out area.

This is a prop valve for a jeep wrangler.

option one: zip ties in x pattern

option two: drill some holes and screw it on

option three: learn what a drift is
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Old 12-07-2015, 11:18 AM   #26618
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1. I'll add more zipties for good measure.

2. Not exactly sure of the anatomy of the part underneath, don't want to ruin the $150 part.

3. Turns out I actually have a drift punch for my air hammer. Probably would have worked.
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Old 12-07-2015, 12:12 PM   #26619
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Naked SR-71





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Old 12-07-2015, 01:20 PM   #26620
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Naked SR-71
Previous me (2A7x1) cringes at the sight of that. So many fasteners to get stuck.
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