I made a few adjustments before I make the table.
I’m going to try and document and put this in it own thread with parts…
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Hi. Very nice project. Good to know if you can document it👍
Just one question about you homing. Is it true the homing of the upper arm (y) is done only when the homing of the lower arm (x) is done?
Yes. The X has to be home before it seaches for the Y.
I moved end stops off gears and put them at elbow.
Ok thanks. I don’t know if you want to do only a round table but I want to build a rectangular table and I’m facing to a homing issue with the upper arm hitting the border in some case:
Do you have a solution?
I have actually read your posts and responses from Jeff. I’m very new at this and Jeff is the main man here…
As of now I don’t know how to confine the circle of the arm to the square table. But if I come across anything I’ll share for sure.
Hi all. I’m trying lot of sand and find some working and some not. What I have noticed is we need particule size around 0.1mm. And the sand must not have quartz in. What do you use by your side?
@jeffeb3. You are the only one I know using the sisyphus table. Can you describe the sand? Color is white? Does the sand make glass noise when.running? Is the particule fine like baking soda (0.04 to 0.07mm)?
Thank you
HaHa… it Kinda works!?
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They sell it in their shop. Underneath the sand is fabric on a stiff board (maybe ACM?). The sand is fine sand, but not as fine as baking soda. It is a little tan, not perfectly white.
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I definitely need to try that. Did you print the fin?
Yes. Printed with a pocket to recess a 5x3mm magnet and it was riding on a 4mm bearing.
I am going to test a few shapes that plow through the sand…
Thank you very much. I have see they sold it but the fees are very expensive to my home😒
Buenos dias, acabo de ingresar al foro que descubri buscando informacion para construir mi mesa de arena, he leido ya bastantes paginas y visto bastantes videos pero aun tengo muchas dudas si estoy haciendo las cosas bien, hasta ahora he construido el mecanismo, y uso un arduino uno ( tambien dispongo de una arduino mega ) pero estoy atrancado en la parte de software, he realizado muchas pruebas con variantes de GRBL en configuracion cartesiana y coreXY, pero no veo resultados, necesitaria una pequeña ayuda orientando que hardware debo utilizar y su correspondiente software, he visto que hay gente que utiliza una raspberry pi junto a un arduino uno y en otros casos solo arduino y realmente estoy confundido. espero poder recibir ayudas, gracias.
Good morning, I just entered the forum that I discovered looking for information to build my sand table, I have already read many pages and seen many videos but I still have many doubts if I am doing things right, so far I have built the mechanism, and a use arduino uno (I also have an arduino mega) but I am stuck in the software part, I have done many tests with variants of GRBL in Cartesian and coreXY configuration, but I do not see results, I would need a little help orienting what hardware I should use and its corresponding software, I have seen that there are people who use a raspberry pi together with an arduino uno and in other cases just arduino and I am really confused. I hope I can receive help, thank you.
Juan, can you make a new post with photos and details about your machine? We can figure something out.
My Sandbot is now functioning very well. After redesigning the arms of the robot it works great.
I’m still trying different types of sand like the one you can see in the video.
The ball is sometimes slipping over the surface instead of rolling.
I’m planning to cover up the mirror with some kind of fabric for example velvet.
Greetings
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Hi. Very nice. Congratulations! What is under the sand. Glass or wood?
What sand do you use currently ? And what de particule size?
I have see that your ball is going right and left. I have use under tablecloth to put under the sand and it fix that!
IMHO, the biggest reason the ball slides instead of rolls is because of the depth of sand. If it is over 1/4-1/3 height of the ball, it would rather push than roll.
There is a big mirror under the sand.
In the video, I used a special kind of chinchilla bathing sand which is a bit rougher than the normal one.
I also tested with normal chinchilla sand and it works even better.
I don’t really know what grain size it is but really small 
I’m going to try to put the tablecloth under the sand and look how it turns out.
I agree with you that there was too much sand on the table in the video.
It was the first test and I need to find the right amount of sand. 
I’m going to try to get that 1/3 to 1/4 in height.
Do you think putting some kind of fabric on the table is an idea to try?
XD Love the idea of putting other things in the sand instead of marbles.
Great work with your machine!
I tried to spell out “Land Shark”…
means something if you watched old Saturday Night Live!