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PostPosted: 08 Mar 2011, 21:23 
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Joined: 14 Feb 2011, 02:23
Posts: 34
Location: Vancouver Canada
I am at the point where I am going to be drilling some vents in my chassis. Its a hammond 1444 aluminum chassis 12 x 8 x 3. I have the drilling planned for the top already. Most of the holes are planned for right over the heat sink fins, and in and around the LM3886 boards, but I think I should also put some venting in the bottom and possibly the sides. Just wondering how you guys approach this. I want to make sure I get decent air flow into the chassis to help cool things down a bit.

Thanks in advance!


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PostPosted: 09 Mar 2011, 13:12 
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Joined: 28 May 2008, 21:53
Posts: 4592
Location: Winnipeg, CANADA
Heat will rise, so the top holes will exhaust and air will be drawn in from the sides or bottom. Either the sides or bottom or both is fine. If you use the bottom, you will need feet to give some clearance from the surface the amp will rest on. Note that bottom holes may not work too effective on a carpet.

If you have the clearance at the bottom, I would place the ventilation holes pretty much in line with the heatsink fins and top ventilation. But the side is fine too. Really it comes down to clearance at the bottom and aesthetics.

Cheers

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PostPosted: 09 Mar 2011, 17:42 
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Joined: 14 Feb 2011, 02:23
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Location: Vancouver Canada
Thanks Gio! I'll line up the top and bottom then, and put some feet. I would like to keep vents off the sides for aesthetics. Should be fine. Got a lot of drilling to do! I have tried using my Dremel to cut venting before, but I have to admit it looks ugly. I am not too pro with that yet.


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PostPosted: 10 Mar 2011, 10:52 
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Joined: 14 Feb 2011, 02:23
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Location: Vancouver Canada
Well, I just drilled about 300 small holes in the top. I am going to change my plan for the bottom a bit. Make the holes bigger and do less of them. I only have a hand drill, so its difficult work. I think next time I'll use a jigsaw to cut out blocks and cover the inside with wire mesh or something. Looks alright though, except for the few places where the drill got away from me.


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PostPosted: 10 Mar 2011, 10:59 
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Joined: 28 May 2008, 21:53
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Location: Winnipeg, CANADA
Yes, go bigger - remember Area = pi x r^2, so it is more efficient and less work.

The hand drill is not bad. It may be more physical effort, but it is easier to control. There is nothing worse than a power drill that slips and ruins a chassis. OK ok, I guess a power drill that slips and does a number on ones hand would be worse.

Cheers

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[ DIY Mains AC Power Cable Cord ] - [ Gobo LM1875 Amp Kit ] - [ Tang Band D4-1 Horn Speaker Kit ] - [ Monoblock Push-Pull KT88 Tube Amp Kit ]


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PostPosted: 10 Mar 2011, 20:21 
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Joined: 14 Feb 2011, 02:23
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Location: Vancouver Canada
Sorry, I meant power drill. I wish I had a drill press, or even an actual hand drill! My power drill got away from me plenty of times. I am hoping that painting it will make my mistakes less noticeable. I did countersink each one a little bit on the inside. I was thinking about keeping them small would help keep dust out, but next time, I am going bigger for sure. Luckily no hand injuries, so that's a bonus. Things are going well so far. Just waiting on parts. I like these 1444 chassis's. They look great, and are pretty easy to work with. Want to try one with the wood panels next.

How do you go about laying out parts in your chassis? I have just been using microsoft word to lay everything out, but I would love to get a program that's a little more useful.


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PostPosted: 12 Mar 2011, 15:58 
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Joined: 03 Jan 2009, 10:44
Posts: 121
Check this thread for layout software (DIY Layout Creator). I'm still loving it.


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PostPosted: 22 Mar 2011, 11:44 
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Joined: 14 Feb 2011, 02:23
Posts: 34
Location: Vancouver Canada
connemaraguitars wrote:
Check this thread for layout software (DIY Layout Creator). I'm still loving it.

Thanks! I'll check that out.


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PostPosted: 22 Mar 2011, 12:04 
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Joined: 05 Nov 2010, 21:07
Posts: 706
Location: South East US - Tennessee
You need to use a center punch or, better yet, these self piloting drill bits;
http://www.micro-machine-shop.com/drill ... t_tips.jpg
However, for larger bit sizes, it's still a good idea to start with a center punch.

A drill press would make the job a whole lot easier.

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The key to a successful build is to keep the smoke IN the circuit.
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We cannot solve our problems with the same thinking we used when we created them. - Albert Einstien
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LM380 Bridged Guitar Amp, Oatley K301 Phono Pre-amp, Oatley K272 Headphone Amp, Tube proto-board


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