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turtlebot kinect mounting

asked 2011-04-20 01:13:54 -0500

Alper Aydemir gravatar image

updated 2016-10-24 09:00:42 -0500

ngrennan gravatar image

Hi!

I was wondering how the kinect is mounted on turtlebot as I'm trying to mount one on our Pioneer robot sporting a pan tilt unit. So I thought I could ask a quick question about that.

I can see that perhaps you drilled some holes on Kinect and used just the right screw to squeeze it in (if not how to fasten from the other part?) Or used the existing holes under air vents for the bottom part?

If you have a parts list and some quick instructions for mounting that would be most helpful.

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answered 2011-04-20 04:36:32 -0500

fergs gravatar image

If you pull off the little vent covers on the bottom (they are just a stick on, flexible plastic), you'll expose a total of 4 screws. These screws do require a security Torx driver to remove, but once out, you can thread a standoff into them.

I believe this is what the turtlebot is using. I am using these mount holes on my robot Maxwell.

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This is what the TurtleBot uses.
tfoote gravatar imagetfoote ( 2011-04-21 06:36:27 -0500 )edit
2

answered 2011-04-22 18:16:57 -0500

Bart gravatar image

I use the four holes on the bottom of the Kinect base. I tapped them out with four small screws (don't remember if metric or SAE). Built two stacked adapter plates from plexiglass to mount to a servo panning turret (Servocity SPT-200). One plate bolts to the turret (countersunk screws), one to the Kinect (countersunk screws) and then I bolt through both plates on the outside edge to complete the mounting.

Using the Kinect base mount holes allows use of the Kinect tilt motor, which is useful as the tilt angle targets are relative to the built-in accelerometer (gravity, tilt angles are relative to a level floor). I also have a separate tilt servo for looking straight down at the arm hand position in close to the robot, as the Kinect can only angle down to about 25 degrees.

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Hi Bart--I was wondering how you deal with the jiggle in the Kinect base mount. If I place mine on a table and grab the camera body, I can move the ball joint quite a bit.
Pi Robot gravatar imagePi Robot ( 2011-04-22 23:49:16 -0500 )edit
The Kinect has a friction joint for manual panning, but it stays in position during use. My 3 joint pan/tilt tree does jiggle, but settles in less than a second. When panning I use a timer to wait for it to settle in each position. A complete pan takes 3 seconds. Pan servo alignment is a challenge.
Bart gravatar imageBart ( 2011-04-23 03:47:33 -0500 )edit
OK, thanks--I was mostly wondering if it was just mine that jiggled. I ended up taking the motor out of mine and gluing it solid. Then I just use a pair of Dynamixel AX-12 servos for pan and tilt.
Pi Robot gravatar imagePi Robot ( 2011-04-23 09:54:22 -0500 )edit
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answered 2011-04-20 03:34:59 -0500

It looks like the turtlebot uses custom holes drilled in the kinect (someone else could answer this better). However, I've been happy using a piece from the kinect wall mount, which includes a little snap-on piece with a standard 1/4"-20 tripod hole.

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answered 2011-04-22 08:51:16 -0500

Alper Aydemir gravatar image

Thanks, that is what we do as well and I was wondering if there was some special trick. http://www.csc.kth.se/~aydemir/kinect_strip/kinect.html

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Asked: 2011-04-20 01:13:54 -0500

Seen: 1,707 times

Last updated: Apr 22 '11