What size hole saw for an 80mm fan.

[Torghn]

This may sound like a dumb question at first (maybe it is) but on an 80mm case fan, what is actually 80mm? Is it the casing the fan is in or is it the hole it moves the air though? Basically what size diamitor should the hole you put in your case be? The full 80mm or just a bit smaller? I currently have access high quality 72mm hole saw. Would the 8mm of over hang cause noise problems?

 

[amdskip]

Not sure on the exact size but that overhang wouldn't help your purpose out there too much.

 

[Blain]

3"

 

[Torghn]

3" comes out to be 76.2mm. So is the 80mm the casing size or does the tiny bit of overhang not make a difference?

 

[Blain]

3" hole saws are common. You can get any size you want by using a jig saw or dremel.

 

[BigEdMuustaffa]

We're talking METAL saws right? I used the metal cutting wheel bit on my dremel to cut through the metal, but if there is a circular saw for metal, I'd rather use that. I'm only familar with the circular "wood" blades for cutting keyholes in wooden doors. The dremel metal cutting wheels don't cut the entire circle at once, you have to make the circle yourself. So far I only cut out the fan holes on the case, so I could get better airflow with a grille. 😕

 

[Blain]

Bi-Metal hole saws...

"Features: Optimized tooth design for superior performance while cutting metal
M3 steel provides faster cuts and longer life than the M2 steel of the industry standard product
Thick, hardened backing plates prevent warping at holes and increases cycle
Versatility of deep-cut style allows users to cut either wood or metal"

 

[BigEdMuustaffa]

Blain, u da man......🙂

 

[Boobers]

A hole saw is not a very accurate cutting tool. For example, if you cut a hole with a 3" hole saw the final opening will be slightly larger than 3", probably 3 1/16" - 3 1/8". The saw itself is not perfectly round and is not perfectly centered... I've used hole saws to cut through 1/4" plate steel to make exhaust system flanges and have had much experience with them. Remember, when cutting through steel with a hole saw, use a SLOW speed drill and some type of light oil for a lubricant while cutting. This will keep you from burning up the saw on your first cut. The best way to do it is to mount the saw in a drill press (if you can)...