Stewart Platform

[Dan Royer]

http://www.marginallyclever.com/blog/2013/03/miniature-rotary-stewart-platform-demo/

I'm looking for ideas to use this with.  Maybe someone has a cool idea for the Maker Fair?

[Michael Kessler]

How about a yeast starter agitator?  You could use a flask with a small amount of wart and some yeast and get it to swish around to start it off.

[Loial Otter]

laser pointer aiming platform. robotic head that looks at people (using motion on an RPi). The best soldering station ever.

On Mon, Mar 11, 2013 at 1:44 PM, Dan Royer <aggr...@hotmail.com> wrote:

[Mark Mosher]

make it learn how to solve one of these http://dx.com/p/wooden-rocking-and-rolling-balls-on-wooden-maze-board-134567

[Dan Royer]

Range of motion is about 15 degrees and maybe 1cm in each axis.  Yeast starting is a neat idea.

Anyone here good with computer vision?  We could try

www.youtube.com/watch?v=FBy_e4yvqhQ
or
www.youtube.com/watch?v=uERF6D37E_o

Dan

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Date: Mon, 11 Mar 2013 13:54:32 -0700
Subject: Re: Stewart Platform
From: loial...@gmail.com
To: vhs-g...@lists.hackspace.ca

[Michael Kessler]

Put a model of a plane on it, project a helicopter shot sequence in front of it on a screen, and make it look like its flying and banking through the turns.  (Miniature motion control platform for videography and film)

[Michael Kessler]

auto-pharmacist: make it divide up pills.

[James Baxter]

Very cool idea Mike

--------------------------------------
 James Baxter
 Dynamic problem solver
--------------------------------------

On Mon, Mar 11, 2013 at 2:09 PM, Michael Kessler <mike...@gmail.com> wrote:

[James Gregson]

Cool project Dan, where do you get the rod-end joints from?

James

[Kevin]

I love the flat platforms doing the work of a bowl...  Literally dynamic bowl simulation for one ball at a time.

On Monday, March 11, 2013, Dan Royer wrote:

Range of motion is about 15 degrees and maybe 1cm in each axis.  Yeast starting is a neat idea.

Anyone here good with computer vision?  We could try

dsPIC Ball & Plate with touchscreen and servomotors

[Dan Royer]

If I had a Stewart platform that moved fast enough I'd put it on a helmet and use it as a steadycam for a GoPro.

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Date: Mon, 11 Mar 2013 15:17:30 -0700
Subject: Re: Stewart Platform
From: mrj...@gmail.com
To: vhs-g...@lists.hackspace.ca

[Kevin]

Try running around with a 3 axis IMU to record how much acceleration and travel a fixed camera experiences.  The speed may be within the range of the device you have if the travel is minimal.

you should be able to trade speed for travel or travel for speed by changing the ratio of arm length to servo arm length.

[Al Grant]

Hey Dan,

I'd be up for trying to do a ball on plate balancer; and I have some experience with computer vision!

I'm probably not coming in this week (writing a paper for school...) but chat next Tuesday maybe?  I'll see if I can get my opencv stuff working again over the weekend.

Al

[Dan Royer]

http://www.marginallyclever.com/shop/index.php?main_page=product_info&cPath=1&products_id=59

Now in store.  Just sayin'.

Dan Royer
Marginallyclever.com - 3D Printing & Robots
+1 604 916 2281

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Date: Tue, 12 Mar 2013 17:31:52 -0700
Subject: Re: Stewart Platform
From: a.n....@gmail.com
To: vhs-g...@lists.hackspace.ca

[Luke Closs]

Perhaps this question has an obvious answer, but why does it need 6 servos instead of 3?

Best,

Luke

[James Gregson]

It orients and positions the platform so 3 translational degrees of freedom and 3 rotational needs six actuators.

Looks a bit like a delta robot (which Dan also built) that only positions the platform and so that one only needs three servos.

James

[Dan Royer]

Luke: Yes, it needs 6 servos.  I've just secured permission from innerbreedFX to build this joystick as a companion piece:

http://www.youtube.com/watch?v=V2YWA2xH0oA

Anyone up for the challenge of making it appear as a real joystick to OSX and Windows?  I'd love to use it to play Descent or Minecraft.

Dan Royer
Marginallyclever.com - 3D Printing & Robots
+1 604 916 2281

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Date: Thu, 21 Mar 2013 13:09:44 -0700
Subject: Re: Stewart Platform
From: james....@gmail.com
To: vhs-g...@lists.hackspace.ca

[Keenan Tims]

There are quite a few examples of USB HID joysticks on the V-USB projects list. Shouldn't be difficult to adapt one of them, assuming you can afford the interrupt cost of V-USB.

How does this work as an input device? Are you doing position sensing and just de-powering the servos?

K

[Michael Kessler]

The arduino leonardo can act as one, I also have worked with bluetooth HID controllers as a joystick; available from sparkfun.

[Dan Royer]

Keenan - I was going to mod the servos so that all I get are the potentiometer signals.  I may even get my supplier to deliver the servos modified for me to simplify delivery.

Also: I'm ordering in 200 servos.  Anyone need extra, let me know.  They're FUTABA S3003.

Dan Royer
Marginallyclever.com - 3D Printing & Robots
+1 604 916 2281

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Date: Thu, 21 Mar 2013 13:47:31 -0700
Subject: Re: Stewart Platform
From: mike...@gmail.com
To: vhs-g...@lists.hackspace.ca

[Loial Otter]

It'd be interesting to make this 3dconnexion-compatible. The positioning range is about the same and that'd allow reuse of the driver code made for all the cad programs. Anyone have a USB analyzer to reverse engineer my device?

[Richard Sim]

Loial, there are open source drivers: http://spacenav.sourceforge.net/

[Joseph Lunderville]

Awww, but don't you want force feedback?

Dan Royer <aggr...@hotmail.com> wrote:

Keenan - I was going to mod the servos so that all I get are the potentiometer signals.  I may even get my supplier to deliver the servos modified for me to simplify delivery.

Also: I'm ordering in 200 servos.  Anyone need extra, let me know.  They're FUTABA S3003.

Dan Royer
Marginallyclever.com - 3D Printing & Robots
+1 604 916 2281

---

Date: Thu, 21 Mar 2013 13:47:31 -0700
Subject: Re: Stewart Platform
From: mike...@gmail.com
To: vhs-g...@lists.hackspace.ca

[Dan Royer]

You get me a servo that can do that, I'll put it in a joystick.

Dan Royer
Marginallyclever.com - 3D Printing & Robots
+1 604 916 2281

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Date: Thu, 21 Mar 2013 14:51:07 -0700
Subject: RE: Stewart Platform
From: jlu...@catfish.dhs.org
CC: vhs-g...@lists.hackspace.ca