Robotic kinematics

JoergS5

I have time in May and June now to proceed developing robot kinematics. The order is

4 axis parallel (the black robot arm), probably as a quick-and-dirty approach first for @YuriConfessor
DWC plugin to design and analyse a given model
CoreXY/Prusa/Cartesian 5 axis AC and BC
6 axis robot
testing whether Qt is a possibility for a designer/slicer
elaborate tool design. My personal priority is using robot for CNC, so I'll work on support for different tools (tool shape etc).

I'll use 3.5.1 as basis.

Mummed

@JoergS5 Dear Joerg, thank you for sharing all of your hard work. I have this post and RepRap configuration regarding robot 3D printing. Since I am new to this topic, I may as you s question about configuring. Can we use the same procedure if we have a 6DOF robotic arm with its own controller and need to add an extruder to it?
from my understanding, most of the discussions in the forum and documentation focused on developing a robotic arm and its configuration however I couldn't figure it out how to synchronize robot motion and extruder commands for printing.

Thank you,
Mohamad

o_lampe

@Mummed You can define fans, heater and a tool same as any other 3D printer. But to make it work with a 6DOF arm, you'd need a matching slicer.

Toaster0042

@JoergS5 Hey! I just wanted to check back on this and see if you had made progress on this and if you had made the implementation of the new kinematics

JoergS5

@Toaster0042 you're right, I should inform, I will prepare an update.

JoergS5

I'm back with robotics. My partner passed away, I had to mourn, I have a new partner now since a few months, she will be on vacancy alone mid to end may. So this will be the time frame when I will work on robot kinematics again, based on RRF 3.6.

I will implement an idea I had last year and started implementing some time ago. Robotics solutions are be very different for forward and inverse kinematics. So I thought about a generic approach:

a forward chain to combine different drive movements into one movement chain, with one or multiple solutions
a backward (inverse) chain with the result of none to multiple solutions
forward and backward chains are stored in arrays which can be set by parameters with M669. Kinematic code will simply process the chains
to find the chain solutions, the user can think it through mathematically and set the parameters or he can use the to-be-programmed Qt based program to set solutions or simulate them and compare to measurements of the prototype
the chain elements are code fragements to implement mathematical solutions. The mathematicsal solutions can be augmented in future releases when necessary

That's my plan.

droftarts

@JoergS5 I'm sorry for your loss. I'm glad that you have been able to move forward and find a new relationship, and I look forward to more robotics development. I really must rebuild my robot arm...

Ian