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This process is not hard, but it does require taking certain steps. This is a highly accurate file format that is usually generated by a 2D CAD program. Although most laser cutters can use raster files think pixel-based picture files such as a GIF , this type of format is poorly suited for our purposes. Vector images, on the other hand, use mathematical calculations to produce scalable drawings that can be enlarged or shrunk without producing jagged lines. This file type makes for accurate cuts.

You will need to find a suitable CAD program to generate your vector drawing. The process is straightforward, and you only need to learn a few basic concepts for working in CAD.

There are many choices of programs, including some free options. The one that I prefer to use is called devCad, which is specifically geared toward modelers. Regardless, any 2D-capable CAD program can be used by following basic steps. First, you will need to convert the parts drawn on the plans into the aforementioned vectored CAD format. If you are starting with paper plans, it will be necessary to scan it into an image usually a GIF or JPG but can also be PDF format file at a local copy company that does large formats.

If you are lucky, the plans might already exist in electronic format, making you one step closer to laser goodness. Next, import that raster image into the CAD program, then trace over the image. By manually drawing over the image, you create a vectored version of the plans. Unfortunately, there is no automated way to convert the raster image into a vectored format with any consistency or accuracy. With the plans set as a background image, you will need to set the correct scaling in your CAD program.

Some plans have a scale somewhere on the sheet for reference. If not, you can just measure a component of known size with calipers to use as a reference. The software included with many laser cutters uses metric units, so unless you are certain that the cutter can be switched to English units, it is best to measure and draw everything as metric. Each CAD program has its own way of doing this. Now, draw over the parts you want to cut.

If you are new to CAD, try tracing over simple parts first. After a while, you will get the hang of how to connect lines, plot out curves, and manipulate line breaks for stringer cutouts, etc. If you get stuck, there is probably an online video that will help you along. One of the great features of devCad is the ability to "snap" to background graphics. This means that the program detects the lines of the background image and attempts to self-align with them.

Although you still have to manually trace over the image, devCad helps tracing by "snapping" the cursor to lines on the image when you start or end a new line or intersection. It works surprisingly well. Another time-saver is that if you need to make several duplicate parts, such as constant chord wing ribs, you only need to draw one part then copy and paste the rest to clone them.

Be sure to arrange all of the parts that are to be cut into an area no larger than the wood sheet size you will be using. Another advantage of the CAD program is its ability to select and drag parts around to arrange them neatly for cutting. The process is generally simple: Import your CAD file, set the power level, and press start. Laser cutters are rated in watts.

Most good cutters are at least 40 watts and tend to use sealed CO2 tubes as the laser emitter. These can cut balsa and plywood in pretty much any thickness that is typically used by modelers although thicker plywood might need multiple passes and start at a few hundred dollars. Avoid the inexpensive, solid-state, laser-diode-type cutters because they are only a few watts of power and are reserved for engraving or cutting extremely thin balsa.

Remember that these laser cutters can harm your eyes, so always treat the machines with respect and follow recommended safety guidelines. There you have it. The ability to scratch-build long-out-of-production aircraft, make your own custom designs, or even repair damaged airplanes easily and accurately, is a great utility.

At worst, you will learn something. Indiana Warbird By Brittany Goldwyn. Brittany Goldwyn has designed this DIY cat tree that's more than just fun for your cat, it also looks like a piece of natural art you can place anywhere in your home. Using real tree branches, plywood, stones, rope, and faux greenery, your indoor kitty will love their new cat tower. There's a supplies list, building instructions, and color photos to help you build this beginning woodworking project. The Experimental Home.

Pickle Perfect has a more elaborate cat tree plan that includes multiple perches, a hiding spot, a hammock, and all sorts of places to scratch and play with toys. Included in this free plan is a list of materials, written instructions, and color photos. This free cat tower plan at Imgur stands 6 feet tall with 2 platforms - one at the top and one a few feet from the base, as well as an empty, carpeted inside for the cat to move up and down through.

There are several images in this plan as well as specific instructions on what to do to build the whole thing. Cat Tower Plan from Imgur. This is another cat tree that should be very simple to build.

It's made up of 5 platforms with 4 supporting beams. The second half of this guide at wikiHow shows how to make a different cat tree by using an old wooden ladder. Ana White. This free cat tree plan explains how to build 3 platforms with ramps to access them.

There are a total of 10 steps in this guide, plus a tools and shopping list and several real pictures you can refer to as you move through them. A PDF version of this plan is also available. Kitty Tree from Ana White. Including the bottom piece, this cat condo is comprised of four platforms and three support beams.

Kitty Condo Plan from Dadand. HGTV has a free cat condo plan that uses PVC pipe covered with rope for the stand and three baskets that are attached with brackets that are just waiting for your cat to hop in. There's a materials list, color photos, and written instructions to help you complete this project in an afternoon.

It includes a top platform, small home, bed, and a tube, all of which is fully carpeted. The plan shows you everything you need for putting this together, including the list of materials, all the basic tools required, and 15 steps. Actively scan device characteristics for identification. Use precise geolocation data.

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