DIY Plotter Strives For Cheapest CNC Machine Title

Arguably, taking the plunge into the CNC hobby does indeed have potential to end up costing more than expected. But that should be no reason to deter anyone from doing it! [msassa11] shows us how to do it in full effect with his definitely unique and extremely inexpensive homemade plotter.

The design goal was to keep this machine as low-cost as possible while at the same time using materials that can be found around any tinkerer’s shop or at least purchased locally. First of all, you’ll notice that there is only one linear rail, yes, one rail for two axes of movement. The single rail was removed from an inkjet printer along with the mating bushing that originally allowed the print head to move freely back and forth. A threaded rod lead screw does double duty here, keeping the X axis carriage from rotating around the linear rail and also transmitting the force to move the carriage back and forth. Both the lead nut and bushings are held in place with cast-epoxy mounts.

uniquecnc-closeupAs unique as the X axis is, the Y sure gives it a run for its money. No linear rails are used, two lead screws are the only things that maintain the gantry’s position. To prevent gravity from pulling the gantry down and bending the Y axis lead screws, there are a couple of bearings on either side that ride along the bed of the machine. The frame material also hits the cheap target, it’s made from blank PCB board. A PIC16F877 microcontroller and a handful of mosfets control the motors. [msassa11] built this control circuit but admits it’s performance is not that great, it’s noisy and loses torque at high speed.

[msassa11] certainly proves that he is extremely resourceful with the outcome of this project. He met his goal of building an extremely inexpensive CNC machine. Check out his project page to see a ton of photos and find out what other unconventional ideas he used to build his machine.

CD Drive CNC Machine Steals Matt Groening’s Job, Says ‘Ha Ha’

DIY CNC Machines are fun to build. There are a lot of different designs all over the internet. Some are large and some small. Some are made from new material and others from recycled parts. [Leonardo’s] newest project is at the absolute far end of the small and recycled spectra. His CNC Machine is made from CD Drives and can draw a mean Nelson.

First, the CD Drives were disassembled to gain access to the carriages. These were then mounted to a quick and dirty wooden frame. Notice the Y Axis carriage is mounted with bolts and nuts that allow for leveling of the bed, not a bad idea. A Bic pen mounted to the Z axis carriage is responsible for the drawing duties.

[Leonardo] does something a little different for generating his g-code. First he takes a bitmap image and converts it to monochrome using MS Paint. The image is then imported into Cadsoft Eagle and using a modified import_bmp.ulp script. The bitmap is converted into what Eagle considers wire traces and then outputted as x and y coordinates for each wire complete with a command for lifting and lowering the pen.

A PC sends the move commands via USB, through a PL2303HX USB-Serial TTL Converter, to a PIC16F628A which, in turn, sends step and direction signals to the three Easy Driver stepper motor drivers. The stepper motor drivers are connected directly to the original CD Drive motors.

Check out the video after the break….

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$250; Pushing The Limit On Cheap (And Functional) CNC Machine Builds

 

$250 cnc machine - rotary tool

Cost is always a drawback and a hurdle when buying or building a CNC Machine, especially when building it just for fun or hobby. [Eric] was able to cobble together a working 3-axis rotary tool based machine for about $250, a few trips to the hardware store and a bunch of time.

The machine design is loosely based on this one he found on Instructables. [Eric] chose this style because he felt the boom supported tool would have been more stable and easier to build than a gantry style machine. Skate bearings, HDPE sliders and c-channel aluminum were used to support the XY table instead of traditional linear bearings and rails. All three axes are driven with stepper motors and 1/4″-20 threaded rods. The Harbor Freight dremel-style rotary tool helps keep the overall cost down.

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One-night No Budget CNC Machine

The Hackerspace Kraków in Poland hosts a weekly event on Fridays called NightHack. The idea is simple. It’s late Friday night, all the stores are closed — something needs to be hacked.

Just this past Friday night, they decided to try making a CNC machine using only what they had in the space. And gosh darn it, did they ever succeed! The build makes use of an Arduino Mega, broken Playstation 3 drives, a few spare L293D ICs, some hot glue, and wood. The resulting CNC machine is an awesome example of what can be done in a night with the right group of people working together.

It might not be powerful enough to do milling, but works quite well as a small CNC drawing plotter with its massive 5x5cm work area, with a resolution of 0.16mm. Next week they hope to modify it to allow for PCB drilling, which at the right feed rates, might just be possible!

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