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Old Nov 08, 2001, 02:39 PM
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Which dremel bit to cut plywood?

What is the best Dremel bit to cut a shape out of a plywood sheet? I tried a cutoff wheel but it can't cut the curve I wanted, and it burns the wood while cutting. I would rather use my existing dremel and not invest in a separate power tool just to do this one time job.

I am trying to repair the wing to an old plane which requires some ply parts to be made.

Any suggestion is greatly appreciated.
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Old Nov 08, 2001, 02:53 PM
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Palmdale, CA
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It's really the wrong tool for that job.
You will need a good motor saw in the future..
look at a scroll saw or band saw for cutting plywood and hardwoods.. a 9" 3-wheel bandsaw has a lot of throat clearance..
A 15" scroll saw is about ideal for most woods, except maple.
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Old Nov 08, 2001, 03:36 PM
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Yeah I know it's not a suitable tool, but I doubt I will ever do it again, so I really want to avoid buying a new tool just for this one off job.

Anybody tried this tool?
http://www.dremel.com/productdisplay...5&Color=99CCFF
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Old Nov 08, 2001, 03:45 PM
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Westchester County, NY, USA
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I use a carbide bit similar to the one on this page, on the bottom right. I get mine at a local hobby show that comes around every Feb. I've never seen them anywhere else other than on-line.
http://www.spiceberry.com/

Or:http://www.medicool.com/nails/carbide.html top of the page.
Whatever you get it should be carbide.
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Old Nov 08, 2001, 03:50 PM
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Marietta, GA
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Go buy a small fret saw - walmart or kmart will sell one for $5 or so. Use the saw to cut it out but leave a gap. Then use a regular sanding block, and the sanding wheel attachment to shape it.
The attachment you show will NOT work well, unless you're talking 1/16th ply or thinner..
..a
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Old Nov 08, 2001, 04:05 PM
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I use a jigsaw (fine blade though)
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Old Nov 08, 2001, 05:20 PM
DNA
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NE Ohio
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Have you seen those bits they advertise on tv for cutting holes
in drywall and stuff? Sears Hardware had some called Rotozip
SpirAcut bits in 1/8" size. I picked up a pack of 5.

Man are they great. Fit right in the Dremel and will cut just
about anything including balsa, plywood, aluminum, brass, etc.
They cut sideways easier than most drills cut forwards.
I can't live without em now, I cut everything with them.
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Old Nov 08, 2001, 05:47 PM
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Wile E's Avatar
Ferndale, MI
Joined Feb 2000
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Quote:
Originally posted by DNA
Rotozip
SpirAcut bits in 1/8" size
Ditto on the Rotozip bits. I used one with a 90 degree angle attachment on my Dremel tool to enlarge a hole in a plywood bulkhead after it was installed in the fuselage. Also used the full size Rotozip tool to cut the lightening holes out of 1/8" to 1/4" ply bulkheads. Also hogged out a square hole in a piece of 3/4" ply to make a wooden wrench to remove a 6" PVC sewer drain access cover. Tool and bits are very versatile.
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Old Nov 08, 2001, 06:04 PM
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After searching around on rotozip.com, I found these Sabrecut 1/8" bits which they claim will cut general material including wood composites. Is this the samething as SpirAcut bits?

Do you also use a Dremel #565 guide attachment (in my previous post) when cutting? Or can the cuts be made fairly precise with freehand?

Thanks for all these great suggestions! I begin to feel like Tim Allen getting excited about all these tools.
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Old Nov 08, 2001, 06:22 PM
DNA
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Yep, it says Sabrecut on the package I have.

I use them freehand, but like most spinning bits they have
a tendency to go off in a direction favoring the spinning.
A guide would be better for precise cuts.
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Old Nov 08, 2001, 07:05 PM
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Yes, if you get a tight grip with two hands you can keep in pretty much under control.
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Old Nov 09, 2001, 11:01 AM
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Just an update for the record in case others run into the same question...

I went to local Home Depot and wasn't able to find any Rotozip products. But they did have the Dremel #565 attachment which comes with 2 drywall bits and 1 general cutting bits. I bought it to give it a try.

Using the general cutting bit, my 8 years old dremel was able to cut through 1/8 plywood like hot knife on butter. However, the cutout is big and not very smooth. It is difficult to keep cutting in a straight line. So I made a rough cut, and then use the sanding attachment to smooth it out. It turned out great.

I am sure a scroll saw would do much better job at this. But these cutting bits work great for one time jobs without the high cost.

Thanks again for all the suggestions.

Stephen
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Old Nov 09, 2001, 03:45 PM
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Palmdale, CA
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I use the Sears versions of the Roto-zip blades a lot.. the spiral cutter came in handy recently when hacking an opening in an installed plywood firewall.
I suppose using the router holding attachment for the Dremel would make "precision" cuts on flat wood easier than the death grip hold to keep the blade from zinging off to the side...
but a lot of wood goes away with the width of the cut.
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