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The original was rectangular. Couldn't think of any other tool that can do it easier. I called this the wood eraser. Trace the area to cut, and got it done in about 15 min. Will buy another for backup.It does kick back a little, but you get used to it and use a little more strength to stabilize it. I ran this against the edge of the wall to remove excess plywood, and it was a breeze. I couldn't do that with a jigsaw because it was right against wall in the corner.I also had to cut a circle for a hood vent.
I also used the dust extractor adapter - What a charm ABSOLUTELY NO DUST. My house is 1955 with plaster/mortar walls. If you have a Rotozip and a dust problem you need the dust extractor. I used this to route a trough up my wall to conceal speak wire to my home theater speakers. It worked like a charm.
Perhaps the folks who don't like this bit should retry it in a router. I doubt using this bit in a lower powered roto zip could've produced the same results. I bought this bit at home depot for $8 and used it to cut 4 sheets of hardebacker board into a circle for an outdoor mosaic table substrate, using a 3 1/4 hp router and trammel arm. The bit worked quite well, athough I noticed I had to get the RPMs up on the variable speed router to get it to cut easily.
(Of course, the tool will need a 1/4" collet).- Carbide cutters last much longer than tool steel.- Works quite well on soft materials, such as most wood, plastics, and drywall. E.g., porcelain or other hard tiles, concrete products such as blocks, bricks, concrete stucco (in spite of their sales pitch), glass, steel, etc. It's still possible to snap one, but you have to use much more force.
I.e., instead of a drill, try them in a router or high-speed rotary cutter.Cons:- As with any such bit, when the material gets harder, it becomes less effective -- to useless. They work pretty well on some tile backer-boards, but this wears them out faster.Other:Cutting some materials, such as drywall, creates lots of dust. E.g., using it on hard products will dull the bit in a hurry.
RotoZip DC1 Duracut BitPros:- 1/4" bits have significantly greater resistance to breaking than 1/8" bits. They work best at very high speed. I use a respirator.
If you are frustrated with how easy it is to snap 1/8" bits, and your application will be OK with a 1/4" bit, try one of these. Has an excellent life if used only on softer materials.
I was just praying not to hit one of the drywall nails. It's a DUSTY job, but the bit did it without a problem. For the home user, the tool is great and serves its purpose. I have a 1940's home and bought this bit to cut the top of my living room wall's perimeter, just below the curve at the coved cieling because the walls are shot and need to be redone. My walls consist of 1/2 inch drywall with 1/4 + inch mortar, and 1/16 plaster and about 10 coats of paint.
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