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Hey! This thing is still a Work in Progress. Files, instructions, and other stuff might change!
quasithinking

SandBot

by quasithinking May 19, 2018
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Hello. I'm very interested in this project.

One question, will the new version you are making be completely diferent of the Igus Bearing version? I've seen this project:
https://www.thingiverse.com/thing:2266282
with Openbuild Rails and CoreXY. Will it be something like this?

Thanks

CoreXY Frame (v.2.1)

Yes, something like this, but with bearing supported v-wheels and without linear rails.

Hi! This looks great - I was all set to have a go at building it and then I noticed your most recent update.... how are you getting on? I'm not familar with "Openbuild Rails" - does that mean the BOM of additional parts will be different?

Hi, Yes, the BOM will be drastically different for the mechanical parts. You can have a look at https://openbuildspartstore.com/linear-rail/
for the rails. You can either buy the idlers and v-wheels assembly from openbuilds or print your own and just buy some bearings (625 2RS). I have to do some further testing, but my printed parts from TPU further reduce vibrations and reduce noise quite drastically, I don't know how long the last though.

You can safely buy the electronics and Trinamics Stepper Driver, basically all the electronics parts, but I'd hold off buying anything mechanical....

I'm now at iteration 3, MK2 achieved basic functionality, no I'm optimizing. I hope to finish it until sunday, as we have some nice long weekend with the public holidays here in Switzerland.

Ah cool - many thanks for the quick response. It sounds like I'd best hold off for a bit, but very excited to try this in the future. Thanks, and enjoy your holidays!

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Thanks for a very nice design. Printed all parts at 1.03 with a perfect fit on my I3 Mega and has now assembled a 400x400mm surface. Using the TMC2100 really makes it quiet. I’ve tested to use both an Arduino CNC shield and Ramps 1.4 and will settle for the Ramps due to the fact that I can store patterns easily on the SD card and the LCD + encoder interface.
I’have also decided to go for endstops so I’m now in the process of playing around and testing various options. Have anyone else modded the Motor holder and carrier to fit endstops and counterparts?

I am excited about your table. The expression worked very well.
But help with the control. Can not provide a working Arduino file?

I would suggest to use the Ramps controller. Have a look at this site for instructions and even a preconfigured firmware.
https://www.v1engineering.com/marlin-firmware/

That sand looks great. I also like the idea of the sililcon mat under the ball. I'll have to get these things. I really need to finish my nice table. My scrap one is only enjoyable by me.

quasithinking , please check your messages on here, I have a few questions if you have time. One question is related to the carriage, the bores dont seem to be lined up and I am getting some binding.

I think that is intentional. On one side only a sliding element. in the slide totally 3 sliding elements

I have just started this. parts printed and rods assembled. Working on the electronics. I pulled down the Marlin firmware for the ZenXY for the Ramps 1.4. Is that what you are using?
I don't have an LCD screen yet. What should I expect to happen with just the firmware loaded and powered up? Homing of x-y?

Since there is very little info on the electronics side, could you give a description of the process/operation so I know if I am on the right track?
Like flash XX, gcode on an SD, use control knob to start, or will it run a default pattern after homing?
Does it have to be connected to a computer to run the code or can you run it from the SD?

Any info would be helpful. Thanks.

Do you have any videos of the table in action?

Quasithinking, just wanted to say that you did a really nice job designing the parts for this sand table. They printed beautifully for me and just a pleasure to put this thing together. I did have a few questions, but I havent gotten a response yet. It was a direct message through thingiverse.

I also encountered issues with Allted's design--too many alignment problems and it was LOUD. Just started this build, and I'm looking forward to getting it running.

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Nice project ! I stumbled across this by accident and it seems to be well designed and easy to build ... exactly what I was looking for!
Time to get the parts now! Hope to start this although my time is also quite limited ...
Do you think it’s possible to build also a rectangular version as I have a rectangular IKETtable already ?
You’ve mentioned you’re using a modified version of Marlin. Do you share that also?
Best Regards from Germany, Axel

Hi Alex,

A rectangular table should be no problem, just cut the 8mm rods accordingly. Just be careful not to scale up the system too much or the 8mm rods will be too weak. Also, the bottom plate shouldn't be too thick, a few millimeters max, for the sphere to follow smoothly the magnet. The best results so far I got with a membrane (made of some stretchable leather imitate) and cutting out the bottom section of the table as well, I'll post some pictures soon.

I can send you the firmware if you send your email per PM, is not really nice yet, some usage comments are missing, but so far it worked quite nicely. The only thing you should need to change is the axis ranges ("bed size").

Hi, again and thanks for answering my questions.
In the meantime I found out the rectangular shape shouldn't be a problem, too. I'll try your design with the LACK table 50x90cm and hope it'll work out with 850mm 8mm rods, so also same bottom plate as yours ... everything ordered in the meantime.

Another question, if I may, how did you cut the table top in a clean way?

Looking forward to your pictures & I'll PM you my email ...

Hi Alex,
I used a manual router ("Oberfräse" in german), and was using some clamped down straight wood strips as a guide. If you don't have a router (they can be had quite reasonable priced nowadays), you can use a drill to make holes at the corners and use a jigsaw ("Stichsäge" in german) to cut the lines. Probably won't look as nice as with a router initially, but a little sanding and you should be golden.

Thomas

I was tempted to find a good carpenter ("Schreiner meines Vertrauens") and ask him to do it ...
I've got a good Jigsaw also with push blades (not pulling teeth), but IMHO I'll try the carpenter first.

Other tasks would be to find someone who cuts a security glass to put it own top and try to think of a good place to hide all the electronics somewhere nicely in the table ...