NEW202311.TXT

 

ON 20231107@9:10:59 PM at page:
On a web page you were interested in at:
http://techref.massmind.org/Techref/robot/shakey.htm#45237.8826273148
James Newton[JMN-EFP-786] See also:
https://photos.app.goo.gl/yzn4bnYCW4ReXXkZ6
Photos of Shakey from the Computer History Museum 2023



ON 20231108@7:17:22 PM at page:
On a web page you were interested in at:
http://www.massmind.org/Techref/method/math/spatial-transformations.htm#45238.8037268519
James Newton[JMN-EFP-786] See also:
https://http://www.youtube.com/watch?v=htYh-Tq7ZBI
An excellent explanation of quaternions via the multiplication of vectors and their byproducts.



ON 20231117@11:49:24 AM at page:
On a web page you were interested in at:
http://techref.massmind.org/Techref/io/servo/html4audiopwm.html#
James Newton[JMN-EFP-786] edited the page. Difference:
http://techref.massmind.org/techref/diff.asp?url=\Techref\io\servo\html4audiopwm.html&version=0



ON 20231118@10:42:02 AM at page:
On a web page you were interested in at:
http://techref.massmind.org/Techref/io/motors.htm#45248.4458564815
James Newton[JMN-EFP-786] Says
/Techref/io/bldcs.htm
Brush Less DC Motors



ON 20231118@10:43:48 AM at page:
On a web page you were interested in at:
http://techref.massmind.org/Techref/io/motors.htm#
James Newton[JMN-EFP-786] edited the page. Difference:
http://techref.massmind.org/techref/diff.asp?url=\Techref\io\motors.htm&version=1



ON 20231118@10:44:12 AM at page:
On a web page you were interested in at:
http://techref.massmind.org/Techref/io/motors.htm#
James Newton[JMN-EFP-786] edited the page. Difference:
http://techref.massmind.org/techref/diff.asp?url=\Techref\io\motors.htm&version=2



ON 20231118@10:44:42 AM at page:
On a web page you were interested in at:
http://techref.massmind.org/Techref/io/bldcs.htm#
James Newton[JMN-EFP-786] edited the page. Difference:
http://techref.massmind.org/techref/diff.asp?url=\Techref\io\bldcs.htm&version=0



ON 20231118@10:47:40 AM at page:
On a web page you were interested in at:
http://techref.massmind.org/Techref/io/bldcs.htm#45248.4497685185
James Newton[JMN-EFP-786] See also:
https://http://www.amazon.com/gp/product/B087M2378D/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1
Very low cost BLDC drivers, including hall effect feedback, are now available.



ON 20231118@10:57:28 AM at page:
On a web page you were interested in at:
http://techref.massmind.org/Techref/io/bldcs.htm#45248.4565740741
James Newton[JMN-EFP-786] Says

BLDC motors are basically a combination of <A HREF="steppers.htm">Stepper</A> and standard <A HREF="dcmotors.htm">DC motors</A> (without the commutator), and are generally efficient, fast, strong at speed, low cost with very long working lives, but do require special drivers. Low resolution position control is possible when combined with sensor feedback from the motor to the driver. Most common 3 pole versions are low torque and need gearing for applications that require force, however, "hoverboard" motors with several poles, can produce significant torque on their own. They all have 3 coils, no matter how many poles they are arranged into.



ON 20231118@10:58:01 AM at page:
On a web page you were interested in at:
http://techref.massmind.org/Techref/io/bldcs.htm#
James Newton[JMN-EFP-786] edited the page. Difference:
http://techref.massmind.org/techref/diff.asp?url=\Techref\io\bldcs.htm&version=3



ON 20231118@11:00:18 AM at page:
On a web page you were interested in at:
http://techref.massmind.org/Techref/io/bldcs.htm#
James Newton[JMN-EFP-786] edited the page. Difference:
http://techref.massmind.org/techref/diff.asp?url=\Techref\io\bldcs.htm&version=4



ON 20231118@11:02:31 AM at page:
On a web page you were interested in at:
http://techref.massmind.org/Techref/io/bldcs.htm#
James Newton[JMN-EFP-786] edited the page. Difference:
http://techref.massmind.org/techref/diff.asp?url=\Techref\io\bldcs.htm&version=5



ON 20231118@6:32:17 PM at page:
On a web page you were interested in at:
http://techref.massmind.org/Techref/other/wells.htm#45248.7724189815
James Newton[JMN-EFP-786] See also:
https://http://www.youtube.com/watch?v=bx_hS_g0wDY
Hand drilling a well using no power or expensive tools



ON 20231118@6:38:23 PM at page:
On a web page you were interested in at:
http://techref.massmind.org/Techref/other/wells.htm#45248.7766550926
James Newton[JMN-EFP-786] See also:
https://http://www.youtube.com/watch?v=xQRhsoSCXvg
Drilling a well by yourself with a power drill, and pump.



ON 20231120@12:28:45 PM at page:
On a web page you were interested in at:
http://techref.massmind.org/Techref/other/cheapmonocoaster.htm#
James Newton[JMN-EFP-786] edited the page. Difference:
http://techref.massmind.org/techref/diff.asp?url=\Techref\other\cheapmonocoaster.htm&version=1

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