Does anyone know measurements for 120mm case fans?

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Elf_Knight

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I am making a custom acrylic side panel for a DIY case I'm making and I am measuring holes to cut out of the acrylic with a dremel. The only problem is that I don't know what drill bit to use for the screw holes. I can measure them using tracing and stuff but don't know what kind of drill to use. I am making an acrylic lid for a wooden PC case but I was planning to have two fans (one exhaust and one intake) for the lid cause I want it to be see-through. Any thoughts?
 
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Math Geek

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i'd get the fans first and then make mark where and what size to drill. they way you know it is right. they seem rather standard so you could likely use any old 120mm fan as a template. but i'd personally rather thave the fan i'm gonna install in my hand when i start cutting n drillin
 
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Elf_Knight

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I already have the fans though. They are two 120mm Fractal Design case fans from old cases I had. I used a pen to trace around the edges of the fan and marked 4 holes for the screws. Hopefully I can find a drill bit that works. Unfortunately I have to wait until Monday to borrow a dremel and drill from engineering :(
 
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Math Geek

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ok i see what you're asking now. took a second to reread it.

can you try a couple bits on the holes from old case? see which one fits the hole the best. smaller is better since you can always make it bigger but not smaller again once drilled.
 
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Elf_Knight

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Sadly i don't have an old case at the minute since I am at my uni accommodation. All I have is the custom case which is basically an open air test bench right now. The PC is laid out flat using a riser cable for the GPU and right angle brackets for the hard drive and SSD. The motherboard is mounted via brass standoffs hand drilled with a screwdriver into a wooden board attached to the bottom of the case. The case is a repurposed wooden box with a lid basically like a wooden briefcase. I drilled a hole for the power button and carved a hole for the power cable to exit the case. I installed a handle and latch for the lid and got a window hinge so the lid stands upright. The screen is a 21 inch 1080p monitor vesa mounted to the inside of the lid. The graphics card has a custom wooden bracket that it is screwed into and the cables are cable tied to each other kind of. It is basically like those briefcase computers but made from wood instead. I have been regularly monitoring the temperatures and it is working fine so far. I'm using a power spliter and converter so the monitor draws power from the PSU. I just need to make the interior lid now since it is open air and install some fans for good air flow. I may drill some holes for the PSU vent and GPU/CPU cooler vents as well. Any thoughts?
 
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USAFRet

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No, not battery...hand rotated.
No matter how 'careful' you are, acrylic is quite temperamental when drilling.
 
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Math Geek

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yah it is VERY easy to crack it, especially at the moment the bit passes through the back side of the window. breaking through the back side should be done very slowly and carefully so you don't do this.

that's why a hand cranked drill is a good idea for just about anyone trying to do this. a nice sharp and new bit is also a good idea so you are not putting a bunch of pressure on the acrylic in an effort to help the bit along.
 
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Elf_Knight

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I went to the engineering department today and they didn't have any tools I could borrow since I am not insured so I may have to wait until I go home for the Christmas break sadly. However, I was wondering if a 120mm hole drill would work? They have some kits on ebay with hole drill bits for 120mm and I could borrow a drill from my own department since we have some DIY stuff. Would that work?
 
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