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11
Misc / Re: Solve Formula directly from a graph
« Last post by mklrobo on March 29, 2015, 08:20:58 AM »
 ;D
In addition, more complex graphs will require integration and
differentation calculus techniques, unless the pattern has already been
recorded.   ;D ;D
12
Electronics / Re: Electric bicycle
« Last post by newbie_teach on March 29, 2015, 04:55:31 AM »
Hey guys sorry for the inactivity, (all exams and stuff killed me).
Now back to the project. While these days I found quite a strong motor in a nearby workshop for fairly cheap so I got super tempted to buy it and I bought it. So I'll be using this motor (if this fails I'll quietly turn back to ebay solution).
About the motor its a 40V DC brushed motor no further specifics on that but has a lot of torque. As said earlier ESC /motor driver will be made at home...any suggestions on how to make one?
And any idea about mounting the motor on to the bicycle frame?
13
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Regarding our method of delivery its very safe and secure.

The delivered is by Courier service it take 2-3 days to delivered in any location  will packaged the banknotes with serial seal to make sure that the banknotes is  protected from damage, leakage, loss or inspection by airport authorities very safe and secure for the delivery.we mostly used service like 2GO delivery and DHL.

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Email: [email protected]
Skype: peterlocke19
Dealers In General Supplies International Business Notes Consultants
17
Mechanics and Construction / Re: Cyclone Rope Piston Coming Soon
« Last post by bdeuell on March 28, 2015, 01:23:32 PM »
I seem to be missing something here, please explain how this drive method provides an advantage over a linear ball screw actuator or other linear actuator.

... Obviously any linear actuator, configured in the arrangement you depict this actuator on a robotic arm, can provide a more constant load/weight capacity throughout a working envelope of an arm. But how is this linear actuator design better than existing designs, such as a ballscrew? The claims for improved motor power utilization appear to be based purely on the use of linear actuator mechanisms over purely rotational joints. Also the claim of inaccessible power requires an assumption that the same load/speed conditions are applied regardless of the robotic arms position. I am not saying that this system does not provide some advantages it is just not clear to me what benefit it provides over existing linear actuators.

note: I have made the assumption that the center screw (around which the cable is wound) has a constant taper.
18
Electronics / Re: Any suggestions for choosing servos
« Last post by bdeuell on March 28, 2015, 01:19:59 PM »
Typically it would be undesirable to connect servos in series and much more practical to wire them in parallel. However, I am sure there are special cases when it would be desirable to connect motors in series. A better explanation of what you are trying to achieve would help us provide the best recommendation for your application.

Please explain exactly what you are looking for when you say "servo". Technically a servo is just a motor with closed loop feedback. Below are a couple types of servos that may be what you're looking for.

Hobbyists are often most familiar with "RC servos" these typically have three wires (power, ground, and signal). For these servos the power and ground wires would be connected in parallel. The signal wire uses a pulse variable pulse length to control what position the servo should move to (there is lots of information about this on the web). if you are going to provide the same signal to several servos these could also be wired in parallel.

There are also Dynamixel servos which are specifically targeted at robotics (hobby level/not industrial). These servos have several wires (i'm not sure the exact pinout) and use a serial communication bus to transmit the control signal. This design allows the servos to be daisy chained (this is different from connecting the motors in series as they are still electrically connected in parallel). There may other brands that produce similar products but I have seen the Dynamixel ones before (never used them tho).





19
Misc / Re: Analyzing the Axon series: Coding, Contruction, and Contraptions
« Last post by mklrobo on March 28, 2015, 07:04:53 AM »
Axon Series: What is this thing?
To use the Axon, you definitely need to download the
example library, Axon_WebbotLib_examples. This has all
sorts of code goodies, that allows you to program some of the
motors and sensors that are sold by some of the vendors in
this forum. (plus generic code, too) So, you can acquire these libraries, get the sensor/motor
you want, then start programming!( Not as simple as that, but
llife is a journey.  :P )  Now, I have to figure out the command/programming
structure......... ???
20
Electronics / Re: Any suggestions for choosing servos
« Last post by mklrobo on March 28, 2015, 05:14:41 AM »
 :D Hello!
In this forum, with the servos used for small robotics, I have not
seen any servos in series. By my understanding, they must be pulsed
to maintain their position, and more pulses to move. The serial capability
of that sceanario is doubtful. I am confident that there are serial servos,
but I have not seen any. You may be able to hook them up in parallel,
with pulses and power provided to the servo simultaneously. Good Luck!   ;D ;D ;D
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