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Author Topic: Chassis, cases, and stuff... Box it up!  (Read 4260 times)

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shipsupt

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Chassis, cases, and stuff... Box it up!
« on: July 25, 2013, 10:30:18 PM »

Sooner or later we need to get 'em off the bench and into a box!  This thread to discuss the trials and tribulations of case work.



I've got a new project I'm starting and I have some ideas on what I want to do with the chassis on this one. 

All of the chassis on my rack are moving towards being black cases with raw, brushed, or polished aluminum front panels.  I'm finally considering the bling in addition to function!

The new project will have several components with wood bases with aluminum tops.  I'm thinking to keep with the theme I want to try a black piano finish on the wood and then either a brushed aluminum or full bling mirror polish.   

Anyone have any experience with doing this kind of wood finish? 

I may cheat, I sent an inquiry to a local high end furniture refurbishment shop to see if they could do the finish work for me if I supplied the cut wood. 

I'll also want to paint the exposed transformer covers in a matching gloss black.  I "think" I can do this myself. 


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Yeah, well, you know, that's just, like, your opinion, man.

dBel84

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Re: Chassis, cases, and stuff... Box it up!
« Reply #1 on: July 26, 2013, 12:26:04 AM »
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n3rdling

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Re: Chassis, cases, and stuff... Box it up!
« Reply #2 on: July 26, 2013, 05:00:28 AM »
Wow that makes my Jonokuchi look like crap.
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OJneg

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Re: Chassis, cases, and stuff... Box it up!
« Reply #3 on: July 26, 2013, 05:09:45 AM »
I kinda wanna build one now
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shipsupt

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Re: Chassis, cases, and stuff... Box it up!
« Reply #4 on: July 27, 2013, 11:46:35 AM »
His blog is pretty good too, you can see more of his impressive builds.  Very inspiring.
http://www.diyaudioblog.com

Quote from: dBel84 on July 26, 2013, 12:26:04 AM
You should take a look at users HighFlyin 's builds

http://www.head-fi.org/g/a/672159/post-pics-of-your-builds/

http://www.head-fi.org/t/85561/post-pics-of-your-builds/8130#post_7664351

..dB
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Yeah, well, you know, that's just, like, your opinion, man.

dBel84

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Re: Chassis, cases, and stuff... Box it up!
« Reply #5 on: August 18, 2013, 01:39:06 AM »
didn't know where to post this but figured it was "stuff"



a linear regulated sculpture from audiocircle http://www.audiocircle.com/index.php?topic=117605.msg1252530;topicseen#new

..dB

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OJneg

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Re: Chassis, cases, and stuff... Box it up!
« Reply #6 on: September 18, 2013, 12:37:37 AM »
So I want to drill some ventilation holes into the top plate of my Hammond chassis. This is for my CKK.



Holes are 6.35mm with 10mm between centers. They'll be right above the output transistors. This look ok? Is that a good amount? Think I should put some ventilation over the Vregs as well?
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Armaegis

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Re: Chassis, cases, and stuff... Box it up!
« Reply #7 on: September 18, 2013, 01:44:57 AM »
Sometimes I wonder just how much ventilation actually helps... it's been a while since I've done the thermodynamics/heat transfer courses, but natural convection is incredibly slow. The random air movement in a room is probably stronger than anything that can develop from the heat. Putting additional holes at a cool section of the chassis may aid in developing a directional flow, but again it probably won't match the random air in the room. Now if there were a fan, things would be different.

I know in some cases a closed chassis with a heat sink would be more effective than vent holes. Just tossing ideas out.
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Do you think there may be an acoustic leak from the jack hole? ~Tyll Hertsens

Not sure if I like stuffing one hole or both holes. Tending toward one hole since both holes seems kinda ghey ~Purrin

OJneg

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Re: Chassis, cases, and stuff... Box it up!
« Reply #8 on: September 18, 2013, 02:03:55 AM »
I already have heatsinks mounted on the output transistors. Little bitty ones though. With the top plate installed the chassis gets hot. Not Asgard hot, but hot enough to make me want to try to ventilate. I can place my hand on it for however long I want. With the top plate off, the amp stays quite cool.

Never took thermodynamics myself, but I imagine the chassis will still get hot even with holes. Hot air inside chassis -> Cool air outside -> Hot air flows outside to reach equilibrium. As opposed to the chassis just getting hot and cooling itself by just radiating heat.

Either way, it could just be an aesthetic thing  :)p17
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Anaxilus.

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Re: Chassis, cases, and stuff... Box it up!
« Reply #9 on: September 18, 2013, 03:25:30 AM »
Depends.  I know Bryston ran into problems air cooling the BHA-1 w/ their original scheme versus just using the chassis as a sink.  Where does the cold/cool air come in from?  You can't have exit holes w/o intake for convection.  Well, you can do anything, but....

Might want to do the inverse on the bottom panel to stimulate airflow from bottom to top and one side to the other.  I would also make the intake holes on the bottom bigger as cooler air is more dense, and smaller holes on the exhaust might help accelerate faster moving hot air via a pseudo venturi effect.  Now this is just for airflow.  Ideally you'd want the hot components directly mounted to the chassis to optimize heat transfer so it can act as a heat sink, maybe w/ some added surface area foils somewhere the natural air flow can synergize w/ the heat sink's cycle for scavenging effects.
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