A Huge, Lightweight Wooden Quadrotor

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[Robert] once built a quadcopter frame by sawing laminate floor tile. It worked, we’re taking the lack of pictures of this build as evidence of how ugly it was. His latest design used a much better looking material – laser cut plywood – and the finished product is very strong and lightweight, even compared to commercial frames made with glass or carbon fiber and epoxy.

Although the design went smoothly thanks to some Solidworks skills, actually cutting the frame from 3mm birch ply resulted in a few issues. The cheap laser cutter used for cutting include some bottom of the line software called LaserWorksV5. There is a kerf compensation feature, called ‘sew compensation’ in the software’s native Chinglish. The software would always crash whenever it tried to calculate the compensation for circles. [Robert] spent two hours figuring this problem out, and in the end needed to break out a piece of sand paper to get a nice interlocking fit.

The completed frame bolts together without any glue at all, and the best part about it is the weight – only 167 grams. Compare that to a similarly sized glass fiber frame, and [Robert]‘s shaved at least 200 grams off his finished build.

Ikea Desk Laser Cutter Combo

Abandoned DIY Laser Cutter installed in Ikea Desk

Craigslist can be a good source for finding someone else’s abandoned projects. Besides being extremely jealous, you’ll agree that [Mike's] find is atypical of the normal Craigslist listings. He scored a 75% complete group of laser cutter parts for $500. That included the XY frame, stepper motors, Gecko motor drivers, optics, and 40 watt CO2 laser tube. He paired the laser parts with another Craigslist find, a $15 desk. A few more parts and 3 weeks of tinkering later, [Mike] had a working DIY mutant Ikea Desk Laser Cutter.

The laser cutter has a 23 x 14 inch work envelope and is controlled via Mach3. The X Axis of the frame had a little bit of wobble in it so [Mike] added a THK linear rail and bearing to stiffen it up. To add a little bit of mistake proofing to the laser, [Mike] put a water flow sensor in the laser tube cooling system. The laser will not turn on unless water is pumping to cool the laser tube. Wrecking your laser tube by accident would be a total bummer!

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Augmented Laser Cutter Removes Design Technology Barriers

augmented laser

Laser cutters, 3D printers, CNC routers — they’re all great technology in the right hands, but unfortunately the learning curve sometimes puts would-be makers at a distance.  [Anirudh] from MIT’s Media Lab is attempting to break down at least one of those barriers with his augmented laser cutter system called, Clearcut.

The system consists of a webcam, a projector, and a semi transparent work space on top of the laser cutter. By placing objects on the surface, the webcam can identify them, duplicate them with the projector, and then laser engrave them. In addition to the “copy and paste” idea of this, you can also use infrared emitting pens to physically draw your design on the work surface to be engraved. It starts to bridge the gap between complex CAD and pencil and paper, something anyone is capable of.

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Laser Cutter Becomes An Etch A Sketch

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The mirror in a laser cutter moves along an X Y axis. An Etch A Sketch moves its stylus along an X Y axis. Honestly, this laser cutter with Etch A Sketch controls is so obvious, we’re shocked we haven’t seen it before.

The Etch A Sketch interface is extremely simple – just two rotary encoders attached to laser cut knobs set inside a small, laser cut frame. The lines from the encoders are connected to an Arduino Pro Mini that interfaces with the controller unit on the laser cutter, moving the steppers and turning on the laser only when the head is moving. There’s an additional safety that only turns on the laser when the lid is closed and the water pump is running.

The circuit is extremely simple, and with just a few connections, it’s possible to retrofit the Etch A Sketch controller to the laser cutter in just a few minutes.  Just the thing for a weekend hackerspace project.

 

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Fail of the Week: Secret Agent-Style Book Hideaway

fotw-book-hideaway-with-laser-cutter

Ah, the movies are an inspiration for so many projects. How many times have you seen a spy movie where a cutout in the pages of a book are hiding something? This was the inspiration which led [Paul] and his crew to try using a laser cutter to remove a handgun-shaped cutout from the pages. The fail began before the project even got started. The sacrificial book they had chosen was too thick to cut directly so they tore it in thirds for the cutting process.

The hijinks are portrayed well in the clip after the break. The infectious giggling as this first trace of the laser cuts the outline makes the video worth watching. As they try to go deeper, the success falls off rapidly. This makes for a great Fail of the Week discussion: Why can’t you cut through multiple layers of a book with a laser cutter? Is this merely a focal length issue that would be solved with a higher-end cutter or is there something else at play here. Let us know what you think by leaving a comment below.

 

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Etching designs into denim with a laser cutter

JeansEtchLaser

Finding new uses for your tools and equipment can be very exciting. [Foamy] wrote in to tell us about a blog post by [qbotics] that demonstrates etching designs into denim with a laser cutter. What a cool unexpected use for a laser cutter!

According to the Epilog laser cutter’s website, “we have engraved everything from denim to acrylic with fantastic results”. This inspired the author of “Science with denim” to try engraving jeans. After some experimentation,  [qbotics] found that setting the 75W laser cutter to 15% power at 100% speed worked best. The results are quite impressive; the engraved pattern looks like naturally faded jeans. Amazing.

In the past, we have seen lasers engrave everything from calculators to wood. We would be curious to see if some of the DIY laser cutters could engrave denim as well. Give it a try and tell us about it!

A 3-Axis Paper Cutting Mini Laser

LaserCutter

Laser are awesome, and so are projects that use lasers. A recent Instructable by [kokpat] gives an overview of how to create a fully functional laser paper cutter using CDROM stepper motors and an Arduino.

What is special about this build, is that it showcases how easy it can be to build a 3-axis mechanical system used for laser cutters, CNC machines, and 3D printers. Using a stepper stage that consist of a motor screw with a nut slider based carriage, the mechanical system can be put together quite easily and cost effectively. Luckily, from an electronics and software perspective, everything is quite standardized with the proliferation of the RepRap and similar machines. Simply pick any three stepper drivers, find the most pertinent firmware, and voilà! You’re done! Well, almost. Don’t forget a 100mW violet laser!

We have seen a ton of really cool laser cutters before, but this has to be one of the cheapest. See the laser cutter in action after the break.

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