Older blog entries for Keith Rowell (starting at number 6)


with ramping

In this screen shot, you can see the curves at the ends of the motion. The servo transitions from stop to full speed in a gradual fashion and slows to a stop in the same manner. This is shown by the gentle "S" curve shape on Bob's scope. Some of the original videos of Knewt showed this fluid motion. We're driving the servo from the ServoMojo using a ramp setting of 15.

Syndicated 2005-12-05 18:44:00 (Updated 2005-12-05 20:12:00) from Keith Rowell

Knewt 2.0 is walking

Knewt is walking again, and I've converted the movie format to Windows Media Video. The ASF format of previous movies was obscure, this one should be availble to more users.

This is what happens when you reach the end of your teather. We're working hard on removing the teathers entirely. The batteries and controller are the culprits.

See the movie here.

Syndicated 2005-11-10 03:04:00 (Updated 2005-11-10 03:11:46) from Keith Rowell

Vacuum Molded parts


Joe Fishback's Robot and Knewt 1.0 & 2.0

Joe Fishback is a vacuum molding expert that I met through the Metal Munchers ( a machinist's club). We met last week and talked about making Knewt's head parts using this technique. You can see the parts Joe molded for his robot in the photo to get some idea of the thickness of the material and the look of such parts. I'll be re-designing the head parts to better accomodate this molding process should there be an opportunity to make these in any numbers. I'm still persuing using STL for the prototype head parts.

Syndicated 2005-11-07 01:42:00 (Updated 2005-11-07 01:49:05) from Keith Rowell

The Twins Are Up


the twins
Keith Rowell Design

Twins yes, however not identical. 2.0 is stronger heavier and not yet completely assembled. (that's 2.0 on the right) I managed to get a test fit of all the physical parts togeather this week, as well as solder the foot sensor boards togeather and route the wiring. I've used different linkages on 2.0 as well. Only time will tell if they're an improvement.

Syndicated 2005-08-31 02:30:00 (Updated 2005-08-31 02:50:02) from Keith Rowell

12 May 2010 (updated 12 May 2010 at 21:09 UTC) »

profile
Keith Rowell Design

The sensors use two 4 wire ribbon cables. With that and the seven servo motors, the body cavity is filled with connectors.

Syndicated 2005-08-31 02:19:00 (Updated 2005-08-31 03:45:28) from Keith Rowell


profile
Keith Rowell Design

The sensors use two 4 wire ribbon cables. With that and the seven servo motors, the body cavity is filled with connectors.

Syndicated 2005-08-31 02:19:00 (Updated 2005-08-31 03:45:28) from Keith Rowell


front quarter
Keith Rowell Design

There's a good bit more bulk on this one, making 1.0 look "svelt" by comparison. The foot sensors and the belly motor are the giveaway.

Syndicated 2005-08-31 02:19:00 (Updated 2005-08-31 02:56:27) from Keith Rowell

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