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XY Table

by Geir, published

XY Table by Geir Mar 6, 2012

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XY Table by Geir is licensed under the Creative Commons - Attribution license.

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Summary

I made this for my brother so he could have sensors or equipment navigate over a microwell plate http://en.wikipedia.org/wiki/Microtiter_plate
it might not be all that useful to anyone else but still I might as well put it up here if anyone is interested.
I added the sketchup model for any parts that I missed on the stl files so just use that to extract parts.
I’m not going in to a full assembly description but for more details you can have a look at this post over at LMR. It also has a video.
http://letsmakerobots.com/node/31381

UPDATE:
Just now I got some information on the 28BYJ-48 steppers that I used and can verify that this is a problem. So for anyone trying to build a sub-mm accuracy XY table, please try finding other stepper motors.
This is the information I’m talking about;
http://arduino.cc/forum/index.php/topic,71964.0.html

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Hello, I was just curious- are there bearings hidden in the pullys? I just printed them and they seem too large for just an M3 bolt. Thanks for posting this project!

Hi
I must admit that it has been a while since I built this, but I do believe that there was a small bearing in the idler wheel.

Maybe his could make a laser engraver with a blue ray laser. The drivers for those little steppers are at deal extreme for $5 with the stepper.

Could you post the parts that use the better stepper?

Very nice project! Im hoping to remix this into a xy plotter :) im a bit confused, have you uploaded the STL's for using Nema-14?

Can you post the full skp project file?
cool project btw :)

No problem. I added the original file and a new version using a better stepper motor http://www.phidgets.com/products.php?category=23&product_id=3301_0http://www.phidgets.com/produc...

Hi Geir,

I see on the LMR page youv'e got the NEMA14 version now, looks awesome. Can you post the updated files for it? Cheers,
Gav

I second this

Could you provide a DXF for the 30cm x 30 cm acrylic base? This would help us make up this very nice XY plotter, now to hang some mirrors on them with a laser would make a very cheap (and small) laser cutter. But not all things to be laser cut are large. What area does the X and Y axis cover?

There is no DXF file for the base. It
’s just a regular 6mm acrylic plate that was cut to about 30x30cm. As I don’t have the XY-table here anymore I can’t give you the exact max working area but it was designed to be used with a 96 chamber microwell. The working area could probably be extended by using longer 6mm rods.
Good luck w
ith your plotter, but I do recommend going for some other stepper motors as these suck.

I like your belt tensioning system! 8-)

Do you notice any bounce on direction changes or are the springs pretty stiff?

The spring system works great and the only problem is the stepper motors that are crap.

I
’m pretty pleased with the spring tension system myself :)

What is wrong with the steppers? they are not precise? I ordered some ones time ago because they are so cheap!

I have a few of those 28BYJ-48 step motors. And I found a different problem, and that's that they have about 5deg of play. Making them pretty much useless for any precision control.

I was looking for a simply X/Y table design, so thanks! I'm planning to use NEMA14 motors:
http://www.watterott.com/en/Stepper-Motor-Bipolar-200-Steps/Rev-35x28mm-10V-500mAhttp://www.watterott.com/en/St...
Which are not that much larger and should fit on your design quite easily.

Thank you for the link on the stepper motor.

And yes the 28BYJ-48 motors are crap. If I had known the issues with the motors in forehand, I would have used something else, so thank you again for the link.

The 28BYJ-48 are indeed crap. I got them for a small X/Y/Z table, but quickly figured out they where no good for that.

I've used 1 for a small "rotate" table. It's a simple round platform where you can put your 3D model on, and then have a camera take photos while the motor rotates at a fixed rate.

Guess I'll use the other 2 in a small robot with wheels.

Nice. !!
&
lt;- two thumbs up

Could you please tell me what the dispensing system is ? I can see what is perhaps a tiny solenoid pump / valve ? just curious. Great job, btw!!!

Thanks for sharing. I have been thinking about the 3D printer application to the scientific community for a while and really like the notion of FREE SCIENCE instead of having to pay exorbitant prices for specialist scientific equipment.

This is a step in that direction.

Awesome stuff! This should help me get my Zen Table built! =D

This could be VERY useful to make a teeny tiny plotter or laser cutter. Thank you for posting it! :)

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