Tripod CNC Plotter

June 16, 2011 by Jeremy Cook 26 Comments

Although some may have heard of a machine like this, the CNC tripod remains an unknown machine to many in the engineering word. This particular machine is set up as a plotter, drawing incredibly straight lines, shapes, and letters.

The machine appears to have 6 servo motors, 3 working as pairs. This would simplify control and allows the pen to be held at a perpendicular angle to the paper. Once could envision this being used with, instead of a pen, a spindle and mill. Instead of the traditional movement of a CNC mill or router, this could be used to cut out complex shapes.

Additionally, if the servos were not driven in 3 tandem pairs, but were all controlled independently, it should be possible to twist the tool in a controlled angular direction. This would add an extra axis of control to an already robust CNC setup. It will be exciting to see how this technology develops in the future. Until then, check out the video after the break: Continue reading “Tripod CNC Plotter” →

Crosshair Aiming System For Your Laser Cutter

June 12, 2011 by Mike Nathan 13 Comments

diy_laser_crosshairs

[Rich] was having quite a bit of fun with his newly-acquired laser cutter, but was not impressed by the stock aiming laser that came with it. The problem with the built-in laser is that it did not actually follow the cutting laser’s path – instead, it has to be calibrated for a fixed focal length. This becomes problematic when engraving and cutting since they require different focal lengths, so it becomes a guessing game as to where the cutting laser will actually end up in respect to the aiming laser.

An additional optic module that solves this problem can be had for about $300, but after sinking $2500 into the laser setup, [Rich] was not inclined to purchase one. Instead, he bought a pair of cheap laser levels online and scavenged the line lens from one module, which was mounted on the laser cutter’s existing aiming laser. The second module was epoxied to the top of the cutting head, to create a set of cross hairs on the work surface.

As you can see in the video below, the hack works quite well, and the lasers are accurate at a variety of different focal lengths.

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3D Printer Looks Factory Made

June 11, 2011 by Brian Benchoff 22 Comments

[Richard Sum] came up with a great looking 3D printer and put his project up as a campaign on IndieGoGo.

[Richard]’s ‘SUMPOD’ is based off the reprap like a lot of other 3D printers, but the SUMPOD has a look of professionalism to it; the printer looks like something that would come from a factory. We think a lot of thought went into the design and fabrication of this printer.

The specs of the machine aren’t too bad either. It’s build area is 150x150x100 mm, or nearly 2 inches than the Makerbot Thing-O-Matic. We asked [Richard] about the drive system of the machine, and he told us there is a linear bearing/belt setup for the x and y axes with a screw drive for the z axis. The electronics are standard NEMA 17 motors and reprap RAMPS fare, so everything electrical is tried and true.

[Richard] plans on adding a Dremel attachment for pcb and lithophane milling. We hope that some design files of the SUMPOD released, but in the mean time we’re really looking forward to seeing the progress of this project.

DIY CNC Touch Probe

June 9, 2011 by Mike Nathan 8 Comments

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[Dennis] recently invested some money in the Tormach Tooling System for his CNC’d Sieg SX3 mill in order to make his tool changes easier. While the kit allows him to easily account for height offsets while changing tools, he has no quick, reliable means of locating the spindle in relation to his workpiece. Tired of manually finding the edges of his workpiece for each axis, he built himself a DIY touch probe to automate the process.

The theory behind the probe’s operation is pretty simple. In the probe’s housing, three conductive rods are mounted perpendicular to the probe tip. Each rod rests between two metal balls forming a complete circuit. When the probe touches the edge of his milling material, the circuit is broken, sending a signal to his CNC control box.

The probe is comprised of several different parts, milled from either aluminum or black delrin. [Dennis] says that after everything was assembled, the runout on the probe was unacceptable, so he made a few tweaks, and now the runout has been reduced to about 0.00025” – well within acceptable tolerance limits for any work he will be doing.

Be sure to check out his site, as there are plenty more pictures of the probe’s construction, as well as additional video.

In the meantime, continue reading to see a quick video of the finished probe in action.

Continue reading “DIY CNC Touch Probe” →

Create And Conflagrate Giant Modeled Sculptures With Kinect And CNC

June 8, 2011 by Jesse Congdon 7 Comments

Summer has hit, and with it a bunch of crazy people going to crazy festivals and (often) burning crazy sculptures to crazy music! In that vein [Matthew Goodman] recently got involved in the burning flipside community down in Texas for his first big effigy build. The project called for a gigantic archway flanked by two human shaped figures, since he had been working in Kinect [Matt] decided to try his hand at physically modeling the figures from Kinect mesh data.

After co-registering the depth and image cameras, setting up a capture routine to record, getting .ply based meshes from the depth camera, and making a keypoint detector [Matt] was ready to start getting real world data from the Kinect. Armed with a ghetto steadycam built from his local Austin Hackerspace‘s spare parts bin, [Matt] proceeded to collect three 1.5 gigabyte scans of the charming [KT], who served as a model for the sculpture.

Once the meshes were imported to sketchup they could be merged and smoothed into a coherent form. The figure was split into CNC-able parts (known as the “lady bits” by [Matt] and his crew) and sent to local makers [Dave Umlas] and [Marrilee Ratcliff]’s ShopBot CNC mill. The 400 some odd bits of wood were then carted to flipside, methodically set up, and promptly set aflame the end of the event.

We have seen a couple of really interesting burning man projects, but this is possibly the shortest lived end result. Stay tuned this summer for more insane Black Rock City bound creations as well. Also don’t forget to check out [Matt]’s site for more details.

DIY Bolt Together CNC Router

June 7, 2011 by Nick Schulze 12 Comments

Before I decided to build my own CNC machine I had seen a few bolt together machines on the internet, usually constructed using 80/20 aluminum extrusion. My write up describes my attempt at a completely DIY bolt together machine made from 25mm aluminum SHS, 50mm shelving brackets and lots and lots of gutter bolts.

Building the machine involved drilling and tapping about 400 holes (if I can still count) and assembling the machine over a 3 month period. I designed it mostly on the fly which lead to a few headaches, but in the end a machine that works quite well (if slowly and noisily). I go through each major component of the machine and describe how and why I would have changed it if I had followed the normal plan-design-build methodology.

I have tried two versions of stepper motor drivers and you can find the schematics for the DIY version on my site. The entire thing runs from a Linux PC running EMC2, check out a video after the break to see it in action and here are some photos of a few of my machined items.

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Snap-together PCB Mill

June 2, 2011 by Brian Benchoff 26 Comments

[Jonathan Ward] came up with the MTM Snap, a snap-together pcb mill as part of the Machines That Make group at MIT.

We covered [Jonathan]‘s previous work made out of half-inch plywood, but the new iteration of his PCB includes a clever snap-together mechanism instead of screws and bolts. Although the MTM Snap looks a lot like3d printers such as a reprap, the similarities end with the off-the-shelf stepper motors. Instead of using motor drivers and control electronics from a reprap, the project uses custom stepper drivers, controlled by a bare Arduino.

We’re really impressed with the results of the MTM Snap compared with what is possible on a reprap-derived milling machine like a makerbot or wolfstrap. We’re thinking that’s due to the mass of this project compared to the printed ABS parts of the ‘common’ 3d printers, but any MEs are more than happy to correct that notion.

Check out the video after the break to see the machine in action and a great view of the snap-fit mechanism.

Continue reading “Snap-together PCB Mill” →