We’re just over a month into the new year, and some people’s resolve on those exercise plans are already dwindling. There’s some good news though. That treadmill can be hacked into a nice belt grinder for your shop.
[Bob]’s treadmill belt grinder is based on a 2.5 horsepower motor he salvaged from a broken, donated treadmill. This motor needs 130 VDC to run, which is a bit of a challenge to generate. Fortunately, lots of treadmills seem to use the same MC-60 motor controller, which is compatible with this motor. Due to the widespread use of this controller, they can be found on eBay for about $30.
With the motor spinning, [Bob] built up a frame for the grinder, added rollers to hold the belt, and a spring based belt tensioner. The motor’s speed set point is controlled by a potentiometer, and the controller varies the power to keep a constant speed. Since the motor is capable of some serious RPM, a tachometer was added for feedback to prevent high-speed belt shredding.
The final result is a very professional looking tool for under $200. What would a grinder like this be used for? Knives of course! 2″ belt grinders are perfect for shaping and grinding knives and swords. In fact, you can see one in use in this sword hack.
Check out a video of the build after the break.
Continue reading “Turn Your New Years Resolution Into a Belt Grinder”
[Mike] had a bunch of disused fitness machines lying around. Being a skilled welder, he decided to take them apart and put them back together in the shape of a belt grinder.
In particular, [Mike] is reusing the height-adjustment guide rail of an old workout bench to build the adjustable frame that holds the sanding belt. A powerful DC motor including a flywheel was scavenged from one treadmill, the speed controller came from another. [Mike] won’t miss the workout bench: Once you’re welding a piece of steel tube dead-center on a flywheel, as happened for the grinder’s drive wheel, you may call yourself a man (or woman) of steel.
The finished frame received a nice paint job, a little switching cabinet, proper running wheels and, of course, a sanding belt. Despite all recycling efforts, about 80 bucks went into the project, which is still a good deal for a rock-solid, variable-speed belt grinder.
Apparently, disused fitness devices make an ideal framework to build your own tools: Strong metal frames, plentiful adjustment guides, and strong treadmill motors. Let us know how you put old steel to good use in the comments and enjoy [Mike’s] build documentation video below!
Continue reading “Treadmill To Belt Grinder Conversion Worked Out”
Moving around in space is one of the major hurdles in virtual reality. A holodeck wouldn’t be much fun if you kept walking into walls. [Gamnaught] is working on a simple solution to this complex problem with his budget omnidirectional treadmill. Omnidirectional treadmills have been around in various forms for a number of years. The idea behind them simple: allow a person walk in any direction without actually changing their position. This is a bit different from the unidirectional treadmill models found at the local gym. Some very complex solutions have been used to create omnidirectional treadmills, including multiple motors and computer control systems as can be found in the US Army omnidirectional treadmill. [Gamnaught] kept it simple. He built a circular 2×4 platform 13-15 degree bowl. The bowl is covered with carpet, and the user wears furniture sliders on their shoes. The low friction of the sliders allows the user to walk, run, and even walk backwards on the platform. Bungie cords provide resistance so the user doesn’t walk off the platform.
The early results look promising. [Gamnaught] says the balance felt a bit weird at times and took some getting used to. Anyone who has spent time with the Oculus Rift or other VR systems will tell you – many aspects of virtual reality take some getting used to. The treadmill is still open loop, however [Gamnaught] hopes to add motion tracking with a Sixense STEM system. We think a OpenCV based system would work as well. We’ve also seen carpet sliders sold as a children’s toy to be strapped over regular sneakers. Going the toy route would avoid needing a dedicated pair of footwear for the treadmill. More build information can be found on [Gamnaught’s] Reddit thread on the topic.
Continue reading “Low Budget Omnidirectional Treadmill”
[Korben] is using a picture frame as a Bluetooth speaker (translated). He hacked a Rock’R² for this project. It’s a device that has a vibrating element which can be used to make any hollow item into a speaker.
Here’s a little mirror attachment that lets you use your laptop as an overhead projector. [Ian] calls it the ClipDraw. Affix it to the webcam and use the keyboard as the drawing surface. Since it’s simply using the camera this works for both live presentations and video conferencing. What we can’t figure out is why the image doesn’t end up backward?
This guide will let you turn a Carambola board into an AirPlay speaker.
Those who suck at remembering the rules for a game of pool will enjoy this offering. It’s some add-on hardware that uses a color sensor to detect when a ball is pocketed. The Raspberry Pi based system automatically scores each game.
We spend waaaay too much time sitting at the computer. If we had a treadmill perhaps we’d try building [Kirk’s] treadmill desk attachment. It’s made out of PVC and uses some altered reduction fittings to make the height adjustable. It looks like you lose a little bit of space at the front of the belt, but if you’re just using it at a walking pace that shouldn’t matter too much.
You can have your own pair of smart tweezers for just a few clams. [Tyler] added copper tape to some anti-static tweezers. The copper pads have wires soldered to them which terminate on the other end with some alligator clips. Clip them to your multimeter and you’ve got your own e-tweezers.
After modifying his new manual treadmill to fit under his standing desk, [Brian Peiris] found a way to let him stroll all over the internet.
After removing the treadmill’s original time/distance display, [Peiris] reverse engineered the speed sensor to send data to an Arduino and his PC. We’ve seen a number of projects that interface treadmills with virtual worlds, but what really makes this project stand out is a simple script using the Throxy Python library which allows the treadmill to throttle his machine’s internet connection.
The end result is a browsing experience that reacts to how fast the user runs. In the demonstration video, you can see Peiris tiptoe through images or jog through YouTube videos. A minimum bandwidth setting keeps the connection live, so if you can’t make it all the way through that HD Netflix movie, taking a breather won’t time out the connection.
It’s certainly a great way to get in shape, or at the very least, it’ll make your ISP’s bandwidth cap feel a lot bigger.
Video after the jump.
Continue reading “Browsing the web one step at a time”
Back in 2009, [Evi1wombat] pulled of this interesting hack, and it has slowly made its way through the internet to find us today. He obtained the computer from a recently deceased treadmill and decided to hack into it. Finding himself unable to flash the existing chip, he yanked it out and replaced it with something he was more familiar with, a dsPIC30F4011. Unfortunately we don’t have any pics of the inside, but he says that he had some fun with wire because the pin mapping wasn’t exactly the same. [Evi1wombat] also gained some respect for the original designer judging by this quote from the source code:
* Damn, the dude who designed that board pulled
* some pretty nifty tricks… took a while to
* get all the drivers working.
Of course, once you have control over some nifty new hardware, the first logical thing to do on it is play “Still Alive” from the game Portal.
Enjoy the video after the break.
Continue reading “Playing the song “Still Alive” on hacked exercise equipment”
In an effort keep his workout schedule on track [Jamie] built himself this dual-screen treadmill work station. He picked up the treadmill for about $50 on eBay, and after some follies with its shoddy construction, ended up with a pretty nice setup.
The first rendition of this project was just a wooden shelf to hold a laptop. But after the treadmill fell apart, sending his laptop tumbling, he reinforced the machine and added a bunch of stuff in the process. There’s now some custom electronics used to track his progress. He painted a white square on the black belt that makes up the running surface. That is monitored by a PIC microcontroller via a phototransistor and op-amp. He uses a USB data acquisition card to feed the belt-revolution count to the computer for use in tracking his workouts.
The presence of a computer in his setup would make Internet logging a snap too. The exercise bike we looked at on Saturday used a direct Ethernet connection for its logging, but [Jamie’s] setup could be used in the same way. He just needs a script to bridge the collected data with an Internet logging site’s API.