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4 axis polar geometry

Posted by fma 
fma
4 axis polar geometry
June 09, 2017 03:43AM
Hi,

I'm building a large CoreXY printer (320x320x320), and its first task will be to print a real size BB-8.

The body will be build from a big PMMA sphere (or maybe stainless steel if I can find one), and 3D printed panels will be screwed on it. For these panels, which are parts of a sphere, I would like to make something smart: instead of print them with a lot of support, I would like to print them as if there where flat. The idea is to build a specific bed, with a vertical rotation axis. This axis combined with X (or Y) axis will make a standard 2D polar geometry. Then, adding another (horizontal) rotation axis, under the vertical rotation axis, will give the ability to bring back every location of the printed part horizontal. The range of this axis is plus/minus 37°.

The printed part will have to be designed flat, which is not very difficult. They will be sliced as if they where printed flat, but with the correct firmware, they will actually be printed as a sphere (on a spherical bed, of course)!

This config does not even require an extension board.

My question is: is it difficult to add the support of such geometry in dc42 firmware? Is it modular enough to do that without changing too much things in the core code? This config will require a good bed leveling procedure, as the spherical bed won't be a perfect sphere...

What do you think?


Frédéric
Re: 4 axis polar geometry
June 09, 2017 04:48AM
In firmware version 1.19 I rewrote the kinematics code to make it highly modular, so that new machine architectures can be added easily. Already this new modularity has been used ot implement SCARA geometry and dual carriage CoreXY geometry. So it shouldn't be difficult to add your 4-axis polar geometry.


Delta printer calibration calculator, mini IR Z probe, and colour touch screen control panel: [escher3d.com]

Large delta printer, and other 3D printer blog postings: [miscsolutions.wordpress.com]

Full disclosure: I have a financial interest in sales of the Panel Due, Mini IR height sensor, and Duet WiFi/Duet Ethernet.
fma
Re: 4 axis polar geometry
June 09, 2017 05:02AM
Great smiling smiley I will have a look at the code this week-end...

Thanks again.


Frédéric
fma
Re: 4 axis polar geometry
June 09, 2017 05:05AM
BTW, which branch/tag do you suggest me to use to implement this geometry? dev? Or the stable 1.18.1?


Frédéric
Re: 4 axis polar geometry
June 09, 2017 05:58AM
The modular kinematics refactoring is in version 1.19, last time I checked it was in the dev branch.
fma
Re: 4 axis polar geometry
June 09, 2017 06:22AM
Ok; 1.19 seems to be the next stable release...


Frédéric
Re: 4 axis polar geometry
June 09, 2017 08:53AM
I've seen a Delta printer doing 5 axis milling. Seems easier to build to me...although pricey for sure
fma
Re: 4 axis polar geometry
June 09, 2017 11:29AM
This will be my next one grinning smiley


Frédéric
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