After cutting out and testing over 80 Hack-E-Bot chassis last weekend, I decided that it was time to post the new laser cut files.
The biggest changes were made to the wheels, line sensor section, and the front servo mount. The new files can be found on Thingiverse.
- After the acid test that was the Portland Maker Fair, were 5 bots were run for 16 hours non stop, I found that the wheels needed to be updated. Originally I cut notches in the wheels to help overcome some traction issues. That did not really work on it’s own, so I added the rubber tires and everything was perfect. However, the notches started to eat through the rubber when the bot stopped or changed direction. I went through tires about once every 10 hours. So now I have removed the notches and made the wheels slightly larger to accommodate for the line sensor a bit more.
- The new line sensor is actually two parts that screw into the base of the Hack-E-Bot. The line sensor itself has 2 spacers that bring it down to its most effective distance from the surface. Just behind the sensor is an extra ball wheel to keep the sensor from getting to close to the surface.
- The front servo mount was changed so that the servo body can fit into the bracket. This gives you more options for mounting the servo and puts it in the best place for the 3D printable claw that will be coming soon.
Another small change was made to improve the way that parts fit together. Small circles have been cut in the corners of shapes that form a sharp angle. This should help to prevent the acrylic from cracking as well as getting a more even fit for assembled parts.
There is a file for the filled engraving and one for cutting. This is because the new cutter can’t handle loading the files at the same time and I have to load them separately.
The files are set up to do one chassis on an 8″ x 10″ or two chassis on a 10″ x 14″ piece of 1/8″ material.
I am working on a version that can be done on a CNC mill using a 1/8″ and 1/16″ end mill. That will be posted as soon as I get a good cut from it.