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1
Hello,
In the Motor Characteristics section there are two inputs for the motor parameters. Can you please clarify which parameters I should put in these fields? Specifically:
  • Torque field - Should I use the stall torque here?
  • Speed field - Should this value match the "Motor Rotation Speed" value in the "RMF Results section"? I assume it should, since according to the calculator, this is the rpm I need to run my motors at in order to achieve my desired velocity. Obviously I'd need to make sure that this speed is reasonably under the no-load speed (about 83% of no-load speed? See question below).
Since this PMDC motor doesn't specify nominal speed (no datasheet that I'm aware of), can I assume it's about 83% of the no-load speed? I came up with this value by comparing nominal and no-load speeds for this motor: http://www.robotmarketplace.com/products/images/0-COPAL60.pdf.

Link to motor the actual motor I'm considering: http://www.pololu.com/product/1101
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Electronics / Re: solder temperature
« Last post by Billy on Yesterday at 12:54:08 PM »
is there any reason to use lower settings?

It's been a few years but I used to solder professionally (I worked on electronics production line for a short time): Too high a heat has a few risks:
1 - you can melt the material under the copper and have the copper pad lift off the board. A real bummer as it can be near impossible to repair the board if pads are small and close together.
2 - on through-hole parts like connectors the plastic may melt making the insertion of the mating parts tough
3 - this one is a little tenuous and I have no proof, but I have been cautioned that any use of a soldering iron on chip capacitors  risks cracking the ceramic (due to rapid temp change) that will lead to reliability issues down the road. Chip caps (being surface mount) are intended for soldering in the reflow oven which is much more gentle than a soldering iron from a thermal shock point of view. By extension, a hotter soldering iron would increase the thermal shock.
4 - as others said, you'll trash the tip faster
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Software / Webbotlib Studio FBoot only works the first time!
« Last post by Hero I on September 30, 2014, 09:58:28 PM »
I'm running the latest Webbotlib Studio on my 64 bit Windows 7 computer.

Webbotlib Studio FBoot works only the first time, but not any consecutive time thereafter.

I found that I had to re-burn the boot loader using my avr dragon device programmer.

Then Webbotlib Studio FBoot worked again, but for only the very first time. All consecutive attempts failed.

Does the Webbotlib Studio FBoot overwrite the boatloader?
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Electronics / Re: Identifying Maxon A-max DC motor
« Last post by waltr on September 30, 2014, 01:58:18 PM »
Also measure length.

The problem with surplus Maxon motors is that most of these were custom to someone's specs. Therefore the PN will not be in the catalog. Best you can do is measure dimensions, Current draw and RPM at a set Voltage. Then try to find a "stock" motor.
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Electronics / Re: solder temperature
« Last post by sdk32285 on September 29, 2014, 09:30:29 PM »
You will burn the flux off faster making it harder to solder and possibly a weaker solder joint (as you are not doing as good a job removing oxidation).
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Misc / FAA clears movie and TV drones
« Last post by Admin on September 29, 2014, 05:57:15 PM »
Quote
The U.S. Federal Aviation Administration is taking its first major step toward opening up the skies for commercial drone use, allowing six TV and movie production companies to use drones to shoot video.


http://www.networkworld.com/article/2688114/government/faa-clears-movie-and-tv-drones-for-takeoff.html

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Electronics / SELF LEARNING ROBOT!!! Need your help.
« Last post by rickey1990 on September 29, 2014, 01:44:51 PM »
Recently iv come across some really intriguing designs based on Mark tildens B.E.A.M tech.Simple walking insect like robots that are capable of problem solving,the designs iv come across,may be old news,but these designs by 'bruce robinson' incorporates short term and long term memory. Evan tho the designs are over 12years old i believe that with the advent of cheaper components and improvements in technology,could bring about some real improvements, sadly these designs confuse me  slightly and i would appreciate any ideas on improvement and any helpful diagrams. HERES THE LINKS http://www3.telus.net/rfws/beam/hider/m_hidr_00.html   http://www3.telus.net/rfws/beam/learn/lr_00.html  [email protected]
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Mechanics and Construction / Re: 3D Printer Measurement Unit
« Last post by Anoroc on September 29, 2014, 12:36:06 PM »
I don't design in AutoCAD, but most of the slicers I've dealt with work in millimeters. I typically design in inches, so I end up needing to do a scale of 2540%

Hope this helps!
9
Misc / Introduction to Robots
« Last post by KURUKSHETRA2015 on September 29, 2014, 08:52:37 AM »
It is often presumed that the different departments of engineering in an engineering college don't blend well , but the word 'robotics' seems to have proved that wrong over the past few years .Frankly put, no reader needs an introduction to the term robotics. In this article, we follow the timeline of how robots have etched their names in history and will continue to scale great heights in the present as well as the future. It goes without saying that the epitome of engineering success comes to us in the form of these marvelous machines. Right from Sci-Fi to realizing the depth of man's potential to innovate -robots have shown the world that nothing is impossible. Starting from the most basic of parts like motors and LED's to some of our modern technologies like multiple Integrated electronic circuits etc., robots have caught every one's imagination.

It all began as early as the 13th century when the famous artist and innovative thinker Leonardo da Vinci came up with the first ever design of a mechanical model of an automated programmable humanoid. Further ahead in the year 1898, Nikola Tesla designed a radio controlled vessel which paved the way for even the most basic of toys like the remote controlled car and so on. The innovative ideas coming from the aerodynamics just proves that robots can fly too ! Things could now easily be done just by attaching a spy camera to the robot in order to monitor the places and distances it could scale. The latest development in robotics which has caused a revolution is that of the humanoid battle bots in china .These battle bots can perform basic functions that any human being can and have given us a glimpse of a new future. Recently, the budding engineers at the Massachusetts institute of technology have come up with a robot which is called a stealth cheetah , this animalistic design is not only speedy but agile as well .

Applying basic concepts of engineering like shearing stress, strain, thermal engineering and the magic of digital and liner integrated circuits, engineers have shown that 'impossible' is just a myth. Again, speaking of innovative thinking, microbial fuel celled robots are a great solution to the modern power crisis and the fact that they utilize microbial power just shows how much we can make use of the things which we once harmful. I would like to conclude this article by saying that one cannot wait for inspiration, but go behind it with a club - as youngsters we should get motivated and work towards our final goal-to apply the concepts we learn as engineers. Robots have shown us just that .
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Software / New WebbotLib Studio Version released
« Last post by Webbot on September 28, 2014, 11:57:34 AM »
Version 1-13 is released. Check out the News page http://webbot.org.uk/iPoint/35.page
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