Society of Robots - Robot Forum
Mechanics and Construction => Mechanics and Construction => Topic started by: dellagd on April 29, 2009, 02:44:13 PM
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I'm looking for some good micro servos
how are these (they are for a small robotic arm)
http://www.raidentech.com/5gtorcse.html (http://www.raidentech.com/5gtorcse.html)
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I see nothing wrong with the servos. And funny thing... I've been looking for some servos like these for a dirt cheap price like that :)
PS Post some pics/vids of your robo-arm progress ;D
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Don't buy from raidentech.
Get HXT900 from hobbycity.com
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WOAH!
$4!
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They also have standard sized for $5 i believe, and super high torque metal geared servos for $8.
Only drawback is a long shipping time.
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Wow, I though $8 was cheap :o, I must've been brain-washed by all of the hobby shop pricing.
And they take Paypal !!! ;D
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how do they sell for that cheap? this is great!
and since I will be getting a used R/C tx/rx I will make a R/C remote controlled arm!
how long is long shipping? (if I bought the shipped from us ones)
and here, take another helpful point.
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shipped from us should be about a week. From overseas is is 2 to 3 weeks.
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I have used GWS micro servos in RC planes quite a bit. Very inexpensive and they have not failed me.
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thought I might ask this too, would this work for a robot with 12v motors (the one you find at radioshack)
http://cgi.ebay.com/New-R-c-Plane-RC-25A-Brushed-Motor-Speed-Controller-ESC_W0QQitemZ260386237147QQcmdZViewItemQQptZRadio_Control_Parts_Accessories?hash=item260386237147&_trksid=p3286.m20.l1116 (http://cgi.ebay.com/New-R-c-Plane-RC-25A-Brushed-Motor-Speed-Controller-ESC_W0QQitemZ260386237147QQcmdZViewItemQQptZRadio_Control_Parts_Accessories?hash=item260386237147&_trksid=p3286.m20.l1116)
it is really cheap and I really want a motor controller.
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No, airplane ESCs are designed for something with no stall current (since all they are doing is spinning a propeller). A robot has high stall current when you first start moving so the ESC will fry there.
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well then u have any suddgestions?
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how about this one
http://cgi.ebay.com/Motor-Speed-controller-240A-Brushed-ESC-for-Model-car_W0QQitemZ290313426108QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item290313426108&_trksid=p3286.c0.m14&_trkparms=72%3A1205 (http://cgi.ebay.com/Motor-Speed-controller-240A-Brushed-ESC-for-Model-car_W0QQitemZ290313426108QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item290313426108&_trksid=p3286.c0.m14&_trkparms=72%3A1205)|66%3A4|65%3A12|39%3A1|240%3A1318|301%3A1|293%3A1|294%3A200
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Something along these lines would work nicely:
http://www.solarbotics.com/cad/products/k_cmd/ (http://www.solarbotics.com/cad/products/k_cmd/)
Also check Pololu, they have a good selection of controllers.
You can vary the speed of them via PWM
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k cool
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Sorry to keep 'banging on' but - Solarbotics L298 and Pololu devices are supported by my library
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http://www.hobbycity.com/hobbycity/store/uh_viewItem.asp?idProduct=3743&Product_Name=HXT_6.9kg_/_39.2g_/_.16sec_Twin_bearing_servo (http://www.hobbycity.com/hobbycity/store/uh_viewItem.asp?idProduct=3743&Product_Name=HXT_6.9kg_/_39.2g_/_.16sec_Twin_bearing_servo)
what is the torque on this motor, and what is dead bandwith?
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Dead bandwidth is pretty much an "irrational number" or something beyond the range, this means you won't be able to control the servo with that pulse width. For the torque, if you're talking about the HXT 900, is 1.6kg/cm.
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no the servo I linked to (I know, I forgot to link to it, I pasted it above. I copyed the link to the clipboard but forgot to paste it :P )
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They give you stall torque there, 'bout 0.8kg/cm. Dead bandwidth should be pretty universal among analog servos, so it should be about the same.
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k thanks
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I use the Futaba microservos. Look it up on the Futaba site.