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Thread: anybody ever use a Rotozip Spiral saw to make cuts in Fiberglass

  1. #1
    Senior Member wbnemo1's Avatar
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    anybody ever use a Rotozip Spiral saw to make cuts in Fiberglass

    As the title says, can a rotozip spiral saw cut through fiberglass say 1/4" thick??
    William

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    Senior Member TwilightZ's Avatar
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    Re: anybody ever use a Rotozip Spiral saw to make cuts in Fiberglass

    have seen it done.you will need the correct bit.

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    Re: anybody ever use a Rotozip Spiral saw to make cuts in Fiberglass

    angel grinder and cut off disc, fastest way to cut fiberglass

  4. #4

    Re: anybody ever use a Rotozip Spiral saw to make cuts in Fiberglass

    Yes, a rotozip will cut it. I also have a $29 air body saw from Harbor Freight that works great for cutting fiberglass.

    Don't forget, any time you are cutting fiberglass, always round all the corners. If you make square corners, stress cracks will form almost every time coming straight from the corner. Round holes good... square holes bad....

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    Senior Member swoodard23's Avatar
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    Re: anybody ever use a Rotozip Spiral saw to make cuts in Fiberglass

    I actually use this cheap hf cutout tool http://www.harborfreight.com/cpi/cta...emnumber=42831 with spiral cutting bits. Works like a charm in tight spaces where a cutoff wheel is impractical. Careful though, it will run away from you and if you take the shield off like I do you will get the occassional blade wobble.

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    Senior Member murcie-me's Avatar
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    Re: anybody ever use a Rotozip Spiral saw to make cuts in Fiberglass

    Jig saw with a coarse cutting metal blade is best, or even a sawzall. Tobygaff is right, ALWAYS round the corners!
    Without talent experience is worthless

  7. #7
    Senior Member wbnemo1's Avatar
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    Re: anybody ever use a Rotozip Spiral saw to make cuts in Fiberglass

    Hello,
    This is what I need to cut...I have to create the area for my correct style engine cover to rest in. The old one was too far back toward the rear and missing hinging tabs. I have to make a cut across the roof toward the rear and cut tabs for the engine cover(shown). I was hoping a rotozip spiral saw would do the trick...I knew opening this thread I would get various answers, but this is why I opened it. All replies are welcome.
    Cheers,
    William




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    Senior Member murcie-me's Avatar
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    Re: anybody ever use a Rotozip Spiral saw to make cuts in Fiberglass

    If you're going to do this, cut in this line also. It will prevent you from getting cracks at point A and B. Just flange it together on the inside. The cut you are going to do can de done with several different tools. The Rotozip will work, but you will go through alot of bits, and its hard to get a straight line unless you have a guide. I still say jigsaw. You can cut slow, precise lines, and the blades are relatively cheap.
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    Without talent experience is worthless

  9. #9
    Senior Member wbnemo1's Avatar
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    Re: anybody ever use a Rotozip Spiral saw to make cuts in Fiberglass

    I wanted to add that groove using my dremel then smoothing with files, you think I should actually cut it?

    Also, I don't want to cut too deep as the roof is solid yet has a upper and lower laminate, it's about a 1/4" thick on the top surface, then hollow for about a 1/2", then another 1/4" thick for the bottom. I'd like to be able to cut the top part but not the lower to leave a flange, if this makes any sense...
    William

  10. #10

    Re: anybody ever use a Rotozip Spiral saw to make cuts in Fiberglass

    I have a Rotozip and have used it to cut fiberglass. In the future, I will not use it for very much. For fiberglass, I like the $9 4" Harbor freight cut off tool and the Dremel for precision. The Rotozip is crazy loud and I would not consider this to be a precision tool. More like a cross between a Dremel and a Saws-all. I loved the Rotozip when I first got it, but it fell out of favor as time went on. Most of the people I know who use it, use it for sheet rock. For sheet rock, I just use a dullish sheet rock saw. Must less noise and mess. Oh, and the mess is huge. It will make fine powder that goes everywhere. One more thing. The advice you see above about rounded edges and where to cut are not something we are making up. I can only talk for myself here, but the advice above has been learned the hard way.

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