When you have a 3d-printer and an excess of filament, it's tempting to try to make everything in the fewest number of pieces as possible. The other issue that ended up taking more time than expected: Assembly
It takes a lot of calculations, so naturally I found this wonderful OpenSCAD library that does it all for you. What makes a gear "good"? As it turns out, there is a particular tooth shape that works best, and the linear dimensions of the shape depend primarily on the number of teeth and the diameter of the gear. It can be calibrated out, but for smoother movement it's best avoided.īacklash is controlled by how closely your gears fit, and how "good" your gears are. That distance must be covered every time the input shaft changes direction, and introduced a nonlinearity into the controls. With gears comes an aspect that could make my life difficult: backlash.īacklash, or more simply "gear slop", is how far the input shaft to a gearbox must turn before the output shaft begins to turn. In particular, I knew I needed an extremely large gear reduction in both axis to get the precision that would be required. I went in thinking "it's all applied geometry" and came out thinking "even the stuff that is applied geometry can be hard". This project took me a little out of my comfort zone.
OPENSCAD GEAR LIBRARY SOFTWARE
Download: openscad-signing-key_0x8AF822A975097442.As evidenced by the fact that I generated that model in OpenSCAD. OpenSCAD is a script-based modelling software that has made actual mechanical engineers look at me with a mix of pity and horror.Prior releases are available at Signature
OPENSCAD GEAR LIBRARY INSTALL
To install OpenSCAD from git on Arch Linux the openSUSE packages built on OpenSUSE build service openSUSE Leap 15.3 (64-bit only) openSUSE Leap 15.4 (64-bit only) openSUSE Tumbleweed Fedora packages built on OpenSUSE build service Fedora 33 (x86_64, armv7l, aarch64, ppc64le) Fedora 34 (x86_64, armv7l, aarch64, ppc64le) Fedora 35 (x86_64, armv7l, aarch64, ppc64le) Fedora Rawhide (x86_64, i586) Arch Linux OBS also supports HTTP links, but it's recommended to use
In Debian/Ubuntu this is usually handled by theĪpt-transport-https package. The repository links below are shown as https, please check for your installation if This can be done by creating a newįile /etc/apt//openscad.list with the URL specific to the distribution. # wget -qO- | sudo tee /etc/apt//obs-openscad-nightly.ascĪfter the key is added, the repository URL needs to be configured.
OPENSCAD GEAR LIBRARY DOWNLOAD
In this case the following command will download and store the key. In newer Debian the storage for the key is changed, more information can be found in the apt-key(8) NOTE: If you get errors about an expired key valid till, please re-import via the following command. To install the packages, the release key must be added with apt-key to the key-ring to allowĪpt-get / aptitude to validate the packages. Debian / Ubuntu packages built on OpenSUSE build service Install the development snapshot packages in parallel to the release versionįrom the official repositories. Note: The packages are called " openscad-nightly" so it's possible to The packages are automatically built based on the
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