majin death

Would you make your posts a little more helpful, I'm kind of a noob at this so if you could explain to me why what I am saying is bad it would be very helpful.

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ericld

You would need a hole saw with carbide teeth, and they are expensive.

http://www.grainger.com/Grainger/hol...-ajw?op=search

Or, you could just get a dremel. All kinds of attachments and versatile.

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majin death

I've got a dremel and I just ordered 100 reinforced cutoff disks for it, but CR thinks that is a bad idea...I guess...

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ericld

Just tape off what you are going to cut with painters tape. Outline your hole with a template, and cut. You can also get a grinding stone to clean up your edges. And make sure you wear eye protection. Those disks are known to explode and the dust isnt so good in the eyes either.

If you are going for the "perfect" hole, a hole saw would be the way to go, but dont get a Bi-metal, either get highspeed steal, or carbide tip. You would only get one or two cuts with the bi-metal, then it would be dull. And cut it slowly, heat is a killer on those blades.

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Lord Xeb

OP, that will work okay but you need a hole saw with a large number of teeth.

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radodrill

Using cutoff wheels on the dremel can be a pain for cutting fan holes; if I have to use a dremel to cut circles then I prefer the Dremel circle cutter attachment combined with a spiral (sideways) bit.

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majin death

I've had several explode on me, I wear glasses.

Doesn't need to be perfect, and I didn't know that about the bi-metals.

Have you used one to cut metal with before.

Can you link me to what you are talking about it would be a great help.

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tubesaddict

Always have the right tool for the right job, and always wear safety glasses. But don't take my word for it...

majin death

Nothing like fighting a square peg into a round hole all day.

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CattleRustler

all I am saying is a holesaw is far superior for cutting fan holes as opposed to a dremel or a jigsaw.

Bi-Metal holesaws
for 120mm use 4 1/2"
for 140mm use 5 or 5 1/4"

bi-metal holesaws wont dull after 2 cuts when used correctly. Apply some tapping fluid to the teeth before you cut case metal and the saw will last a good long time. I have holesaws that I used to cut case steel, plate steel, steel bar, and tempered aluminum, and they arent dull at all. For thin metals I used tapping fluid to coat the teeth. For thicker metals I used dark cutting fluid. All of this is available at home depot / lowes / mom and pop hardware.

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