kadirilkimen / polar-bear-cnc-machine Goto Github PK

Instead of developing your own firmware, consider adding a new kinematics to some common firmware.
For example, duet already supports polar kinematics and corex/hbot, so you could probably find a way to generalize the existing polar to a XZ kinematics other than cartesian by adapting MotorStepsToCartesian and CartesianToMotorSteps (your is a T-bot I think?)

Ref:
https://github.com/Duet3D/RepRapFirmware/wiki/Adding-New-Kinematics
https://github.com/Duet3D/RepRapFirmware/blob/3.4-dev/src/Movement/Kinematics/CoreKinematics.cpp
https://github.com/Duet3D/RepRapFirmware/blob/3.4-dev/src/Movement/Kinematics/PolarKinematics.cpp
https://github.com/Duet3D/RepRapFirmware/blob/0b75dea11109f4734df3aad06c09a868e55b5332/src/Movement/Kinematics/PolarKinematics.cpp#L122

Hi! Will you add a list of specific recomemded components for people with not so advanced knowledge on arduino and coding but would still want the machine since it is a great concept and seems promising? Also are you able to give some kind of estimate of time until v1 of the PolarBear is ready?

As a suggestion for future versions, i think the machine cant get to every single spot when sculpting but it can defenetly do lots and more than a normal cnc machine. I think that if you added a y axis that carried the rotating base it would be the perfect machine but i know that this is a lot to ask and having a bit of 3d modelling experience myself i know it is extremley difficult to do too while also keeping the machine compact and stable. Again, i think this would start to get out of the initial concept and that if it was considered, it would have to form part of future versions. I hope to get a response and to see further development of the machine.
Thanks!

Hi,

First of all, thanks for your work on this project.
What kind of material the CNC work with ?

Thanks

Start with a conventional mill and remove the Y axis. Add the rotary table on top of an X axis.

One big problem with this idea is that the spindle has to align with the center of the rotary table on the Y axis which was removed in this design. On the plus side the rotary table allows you to get to the other side meaning that no space is wasted on where the Y axis would be. If the design is still lacking in rigidity you could use a design similar to a CNC router with basically a column on both sides.

Sketch

The head can be tilted 90°.

Disclaimer: I haven't touched or built a CNC machine in real life.

Project look cool.

How easy is to build my own prototype ?
There is somewhere a tutorial for that ?