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<title>RoboSavvy Forum</title>
<subtitle>Robosavvy Forum: The largest online community of Humanoid Robot Builders</subtitle>
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<updated>2005-12-11T12:22:35+01:00</updated>

<author><name><![CDATA[RoboSavvy Forum]]></name></author>
<id>http://forum.robosavvy.com/feed.php?f=2&amp;t=94</id>
<entry>
<author><name><![CDATA[ninja]]></name></author>
<updated>2005-12-11T12:22:35+01:00</updated>
<published>2005-12-11T12:22:35+01:00</published>
<id>http://forum.robosavvy.com/viewtopic.php?t=94&amp;p=385#p385</id>
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<title type="html"><![CDATA[Message to Meltdown by Ninja]]></title>

<content type="html" xml:base="http://forum.robosavvy.com/viewtopic.php?t=94&amp;p=385#p385"><![CDATA[
Meltdown, while I look for an appropriate power supply, can you help me understand the mail sent to me by Kondo guys with regards to servo vibrations? <br />Here is the mail, along with my request for clarification: <br /><br />Mail from Japan say:<br /><br />&gt;Overshoot means to control to converge the degree of motor axis as you know.<br />&gt;Please adjust the overshoot damping parameter.<br />&gt;In general, servo motor controls the motor using PD<br />control.<br />&gt;Overshoot is adjusted by P and D parameter in the<br />kondo servo motor.<br />&gt;If P parameter and D parameter are mismatch, the<br />motor shows <br />vibration.<br /> <br />************MY QUESTIONS***********<br /> <br />Could you please provide me with further details?<br /><br />- Does P stand for pulse stretch, and D for<br />deadbandwidth? <br />- If yes, In SERVOMANAGER program there are 5 radio buttons for each of the abovementioned parameters. <br /><br />I understand I have to assign the same values to both pulse stretch and deadbandwidth. Is it correct?  <br />Could you tell me which one, among these 5 radio buttons, do I have to select? <br />Furthermore, with regard to the pulse stretch specifically, on which pulse stretch set (1, 2 or 3) do I have to select the radio button? <br />Do I have to define this "radio button" value for all three pulse stretch sets? <br /><br />And for each pulse stretch set to be defined, which speed value (1,2,3) do I have to assign?<br /><br />Do you know how to solve this?<br /><br />By the way, you said you use a 6V &amp; 7A power supply which is definitely fine. I saw on this website that a 6V &amp; 12A supplier - recommended by Kondo -  has been added to the catalogue. <br />Do you know what is the difference between the two? <br />What are the impacts of using a 12A supplier on Kondo?<br /><br />Thank you for your valuable advice, <br />Regards, <br />Ninja<p>Statistics: Posted by <a href="http://forum.robosavvy.com/memberlist.php?mode=viewprofile&amp;u=54">ninja</a> — Sun Dec 11, 2005 12:22 pm</p><hr />
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</entry>
<entry>
<author><name><![CDATA[Meltdown]]></name></author>
<updated>2005-12-11T01:09:06+01:00</updated>
<published>2005-12-11T01:09:06+01:00</published>
<id>http://forum.robosavvy.com/viewtopic.php?t=94&amp;p=383#p383</id>
<link href="http://forum.robosavvy.com/viewtopic.php?t=94&amp;p=383#p383"/>
<title type="html"><![CDATA[Message 4 Se7ven and Meltdown]]></title>

<content type="html" xml:base="http://forum.robosavvy.com/viewtopic.php?t=94&amp;p=383#p383"><![CDATA[
Nice to meet you too.<br />The Robosavvy shop seems to have nice powersupplies too now.<br />You may look into it.<p>Statistics: Posted by <a href="http://forum.robosavvy.com/memberlist.php?mode=viewprofile&amp;u=4">Meltdown</a> — Sun Dec 11, 2005 1:09 am</p><hr />
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</entry>
<entry>
<author><name><![CDATA[ninja]]></name></author>
<updated>2005-12-10T08:24:00+01:00</updated>
<published>2005-12-10T08:24:00+01:00</published>
<id>http://forum.robosavvy.com/viewtopic.php?t=94&amp;p=381#p381</id>
<link href="http://forum.robosavvy.com/viewtopic.php?t=94&amp;p=381#p381"/>
<title type="html"><![CDATA[Message 4 Se7ven and Meltdown]]></title>

<content type="html" xml:base="http://forum.robosavvy.com/viewtopic.php?t=94&amp;p=381#p381"><![CDATA[
Hello Meltdown, nice to meet you<br /><br />thanks a lot for your precious advice. <br />I will purchase the transformer you recommend and let you know about the results. <br />Meet you here very soon, <br /><br />bye, <br /><br />Ninja<p>Statistics: Posted by <a href="http://forum.robosavvy.com/memberlist.php?mode=viewprofile&amp;u=54">ninja</a> — Sat Dec 10, 2005 8:24 am</p><hr />
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</entry>
<entry>
<author><name><![CDATA[Meltdown]]></name></author>
<updated>2005-12-03T03:37:44+01:00</updated>
<published>2005-12-03T03:37:44+01:00</published>
<id>http://forum.robosavvy.com/viewtopic.php?t=94&amp;p=370#p370</id>
<link href="http://forum.robosavvy.com/viewtopic.php?t=94&amp;p=370#p370"/>
<title type="html"><![CDATA[Message 4 Se7ven and Meltdown]]></title>

<content type="html" xml:base="http://forum.robosavvy.com/viewtopic.php?t=94&amp;p=370#p370"><![CDATA[
One possibility is that your computer is sending out erratic signals due<br />to interference, unstable serial port or a ground problem.<br />Also switch off any wifi, bluetooth modules if you have them.<br />I had this problem with a laptop driving my cnc mill which is basically the same as driving a KHR-1.<br />If your on a laptop try both powering your laptop with adapter or battery only and see<br />if things change.<br />Best is to try a second computer to eliminate this possibility.<br /><br />Second possibility and more likely:<br />You shouldn't have to tinker with the servo settings.<br />This is not the problem.<br />For me the problem only occurred when using the gyros.<br />I think it's power related. <br />Either to little or to much volts.<br />To much volts can also cause this but i won't go into this yet before<br />you tried the solutions below.<br /><br />What do you use as the power source?<br />If it's the stock battery just dump it. It's useless as is the charger.<br />Get yourself a decent Nimh GP 1200mha cell pack and a decent nimh charger (you cannot charge nimh with the stock charger!) at your local radio control model hobby shop.<br />These shops have the best batteries and chargers in the business.<br />Or a stabilized powersupply of at least 6 amps continuous.<br />I think your problems will cease then.<br /><br />Why?<br />A little info on batteries.<br />Nimh keeps it's voltage (6v under load) until the the battery is empty.<br />Nimh doesn't have memory problems.<br /><br />NiCad (the stock battery) has memory problems.<br />This means that it will be impossible to charge fully every time you charge when the battery wasn't fully empty'd.<br />NiCad looses it's voltage as soon as a few minutes after use.<br />And it keeps dropping all the time.<br />The KHR-1 electronics have a threshold voltage for them to keep working properly.<br />A NiCad pack will reach this threshold way before the pack is empty.<br />So you charge it again.<br />It will not charge fully due to the memory problem.<br />The problem becomes worse everytime you recharge.<br />And so on and so on.<br />You can guess what this will mean for the KHR-1.<br />Also the stock charger is junk AND CANNOT BE USED TO CHARGE NIMH!!<br />I think that's the problem.<br />I know all this because i have raced rc cars in competition for 20 years now.<br /><br />Remember that the robot is useless without a decent power supply.<br />It's the most important upgrade you can do.<br /><br />i Use a 7amps laptop adapter now which solved all my power related problems<br />Also i build 2 li-poly 1800mha packs into the foot soles for remote operation.<br />Each driving a rcb-1.<br />Li-poli has all the positive things and much more like nimh but<br />have also a few problems.<br />NEVER EVER TRY TO USE LI-POLY IF YOU DON'T KNOW EVERYTHING<br />THERE IS TO KNOW ABOUT THEM.<br />THEY ARE VERY VERY DANGEROUS!!<br /><br />For those who want to know about Li-poly just ask.<p>Statistics: Posted by <a href="http://forum.robosavvy.com/memberlist.php?mode=viewprofile&amp;u=4">Meltdown</a> — Sat Dec 03, 2005 3:37 am</p><hr />
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</entry>
<entry>
<author><name><![CDATA[Anonymous]]></name></author>
<updated>2005-11-30T17:46:51+01:00</updated>
<published>2005-11-30T17:46:51+01:00</published>
<id>http://forum.robosavvy.com/viewtopic.php?t=94&amp;p=368#p368</id>
<link href="http://forum.robosavvy.com/viewtopic.php?t=94&amp;p=368#p368"/>
<title type="html"><![CDATA[Message 4 Se7ven and Meltdown]]></title>

<content type="html" xml:base="http://forum.robosavvy.com/viewtopic.php?t=94&amp;p=368#p368"><![CDATA[
PROBLEM PERSISTING<br /><br />Hi! <br /><br />It took a while, but at last I received the cable for setting servo <br />parameters (my kondo features ICS 786 RED)<br /><br />As Se7ven suggested, I switched the DAMPENING parameter from 2 to 1 for servo channels 1, 2, 3 - left arm – and channels 7, 8, and 9 – right harm. <br />Actually, now Kondo doesn’t jitter as before, but ONLY when motions are <br />low-paced by setting low speeds (2,3,4). Kondo STILL JITTERS at slow<br />speeds (5 and 6).<br /><br />I varied the dampening value only on arms servos, for it was my<br />impression than only those servo jittered, but actually this symptom affects all servos. But, as a matter of fact, vibrations cannot be perceived on legs servos just because legs servos are “loaded” by the weight of Kondo torso: <br />as soon as you lift kondo from the ground and initiate a motion…it is <br />DISASTROUS!!!!<br /><br />So, to avoid proceeding by trial-and-error – servomanager allows you to<br />set several parameters- I hope there exists a textbook combination of<br />values allowing optimal servo adjustment.<br /><br />Please let me have a set of optimal, appropriate parameters to<br />solve my problem once for all. <br /><br />P.S. I cannot understand why the head servo (channel 6) NEVER VIBRATES although it is not loaded.<br /><br />I hope you can help me,<br /><br />Thanks and regards,<br />Ninja<p>Statistics: Posted by Guest — Wed Nov 30, 2005 5:46 pm</p><hr />
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