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Thread: Cutting 120mm blowhole? :)

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    Cutting 120mm blowhole? :)

    Ok guys, i want to, well actually i want to get my dad - to cut a hole for 120mm fan, what size hole saw will i need? not 1200m i guess as thats the overall size?

    also any tips on cutting, dont wanna get it wrong :X - lian li pc-75 case ( alu ) - cutting through the bottom of it.

    Thanks for any help

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    Bonnet mounted gunsight megah0's Avatar
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    114mm or 117 i think

    take your time and remember masking tape is your friend, use it liberally to protect that precious aluminium
    Last edited by megah0; 10-10-2003 at 11:06 PM.
    Recycling consultant

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    Re: Cutting 120mm blowhole? :)

    Originally posted by Gr44
    .....not 1200m i guess as thats the overall size?
    Just how big is your case?? LOL

    You building your own wind farm?? (j/k)


    I'd go along with the advice that mgh0 gave... or try for further info from here
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    What mgh0 says and take your time ffs

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    Yeah, don't do what I did and rush a blowhole on my 1st time ever with a Dremel...
    The "hole" came out egg shaped, and I had to open out the hole to the next sized fan cos the original was so bad.... OUCH!!

    Measure twice, cut once, and all that....??
    ...and use masking tape if you need to protect your case
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    masking tape? does that just cover where your going to cut?

    thanks for the replys

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    ...and the surrounding area, to avoid scratches
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    I know people here have said take it slow ...

    BUT - If you can I'd use a hole saw and use a very fine blade at high speed as it gives a much smoother cut ... if you've got some spare metal lying around, try it on that first as it'll give you practice on something that you aint gonna be devastated to lose!

    What are you using to cut it ... hole saw, dremmel, jig?

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    Senior Member RoGuE|SaBeR's Avatar
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    TIP - A CD is about the same size as a 120mm fan. Use that to mark out the hole and cut INSIDE the marked out line.

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    Use a 114mm holesaw, they give by far the best finish and take no time at all to cut.

    You can get the tools here: http://www.engineeringsupplies.com/

    Very good prices!!! & very helpfully, someone ought to add that url to the sticky.

    Here is one i drilled earlier, nice n neat.

    Last edited by Event Horizon; 21-10-2003 at 11:50 PM.

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    I cut two 120 MM blowholes on the side of my steel case. I used dremel. The effects were very nice. I didnt want to buy a hole saw just for this purpose. I invested in a dremel that can do almost anything - I hope my GF doesnt see that

    You need your cut to be a perfect circle. The edges do not need to be as fine because you should put a moulding around it anyways..... Do not use the small red cutting wheel - it shutters like crazy - goggles are a must !!! I suggest using the fiber reinforced black large cutting wheel.

    ..... a s for the marking - find a center and use beam-compass
    to mark the desired diameter :>
    Last edited by p0lish; 22-10-2003 at 09:54 AM.
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    a query for Event Horizon

    maybe I'm blind but

    as far as www.engineeringsupplies.com are concerned
    where is the 114 holesaws ?

    All I can see are 100mm carbide suckers for £86-150!!!

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    you may well be better off using a dremel/jigsaw/hacksaw or something and then manually file it out to the right size - make sure you cut inside the line though.

    Nox

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    114MM HSS BI METAL HOLE SAW BLADE - Draper £11.19

    Product Code
    56414


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    cheers dude

    also that's exc VAT

    I must say that I'm unimpressed with the site.
    The shops search seems a little defective.
    I'm sure that looking in the shop index under H for Holesaws lists only the carbide and not draper units.

    A search for "draper arbor" comes up empty too,
    BUT after a 16page (out of 22) search through all "draper" products I think I found the arbor I'd need for the above unit.

    hmmm. decisions decisions - the (strangely) cheaper quick-release and lock unit

    Item # 52983
    7/16" HEXAGONAL HOLESAW ARBOR WITH QUICK RELEASE FOR DRAPER HS HOLESAWS 32MM - 150MM
    or

    Item # 52992
    QUICK RELEASE SDS+ SHANK ARBOR FOR USE WITH DRAPER HS HOLESAWS 32MM - 150MM

    even after adding vat that does (from memory) appear to be cheaper than the equivalent from screwfix.

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    The site is hard to search if your not in the industry as the terminology changes, it could certainly be better. They are the best in the UK for price, of that i have no doubts. Delivery is also reliable and prompt. The quick release arbour is good quality, certainly good enough for what you want.

    Good luck

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