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Hello Stephen,
We are also trying to finish our building of Thor. As you say, those gears, since they are beveled, are object of a force that push them outwards, and since you cannot fix them to the rod, we decided to add some washers between every bearing and the gears. It is not a very technical solution but it works for us. The only solution we considered in addition to this one is using two half rods, one for avery bearing-pulley set, and modify the central piece that acts as another support for the rods. In this way you could fix the bearing-pulley sets to the rods, avoiding the axial movement. But we thought it was far more difficult to manage, so we took the first option.
RegardsRafaelHi Anastasia,
We did not come to that problem yet so I cannot help you. I have to admit that I tried the first articulation and its endstop and did not find to work with it, although we did not continue with it since we still have other tasks to end first. If we find how to make endstops work we will write again.
Regards
RafaelThank you both, Angel and Drew.Certainly we did not change any parameter, just downloaded the firmware and flashed ‘as is’ to the Arduino. Now we can tune the axis movements.
RafaelHi, Angel
I will try to explain what Marta says in the first message.We downloaded Thor firmware and flashed it into an Arduino Mega following instructions in GRBL page:https://github.com/grbl/grbl/wiki/Compiling-Grbl
Then installed in a laptop Python 3.6.5 with PySerial and PyQt5 libraries.Connected Arduino to laptop with a USB cable, opened Asgard and connected to the robot. Then, if we click on axis 1 or 2 adding 1º and pressing ‘Go’ the motors run about 90º.At this moment we do not have the electronics board yet, and we connected Arduino Mega to A4988 drivers directly using a proto board (just for testing purposes) We have connected 2 of them so far, using the pins declared in the cpu mapping file from the firmware. But as far as I know this shouldn’t be altering the way it works.Any idea?
Thank youRafaelThank you Ángel again for your help. We changed the motor to a 40 mm long one and also printed a new gear with modulus 1.9, and now it moves fairly well. We continue to build the rest of the robot.
Rafael
Hello:
First of all, thank you Ángel L. M. for such a great project. I’d like to add to the builders list. We are a group of sudents in a spanish secondary school in Sevilla. My name is Rafael and act as the teacher, although I try to let the students go on with the building with as less help as possible. At the moment we have all the parts printed and are building the robot from the base. I hope we can have it working soon.
GreetingsRafael and 4 students.Can you suggest a gcode tool that can do what I need, i.e. to remove support in some areas of the piece?
Regards
Rafael
