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Author Topic: micro servos & motor controllers  (Read 3131 times)

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Offline dellagdTopic starter

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micro servos & motor controllers
« on: April 29, 2009, 02:44:13 PM »
I'm looking for some good micro servos
how are these (they are for a small robotic arm)
http://www.raidentech.com/5gtorcse.html
« Last Edit: April 30, 2009, 06:28:42 AM by dellagd »
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Offline galannthegreat

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Re: micro servos
« Reply #1 on: April 29, 2009, 04:22:39 PM »
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
Kurt

Offline Razor Concepts

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Re: micro servos
« Reply #2 on: April 29, 2009, 05:32:07 PM »
Don't buy from raidentech.

Get HXT900 from hobbycity.com

Offline dellagdTopic starter

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Re: micro servos
« Reply #3 on: April 29, 2009, 06:03:52 PM »
WOAH!
$4!
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Offline Razor Concepts

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Re: micro servos
« Reply #4 on: April 29, 2009, 06:41:55 PM »
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.

Offline galannthegreat

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Re: micro servos
« Reply #5 on: April 29, 2009, 07:08:47 PM »
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
Kurt

Offline dellagdTopic starter

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Re: micro servos
« Reply #6 on: April 29, 2009, 07:25:28 PM »
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.
« Last Edit: April 29, 2009, 07:26:46 PM by dellagd »
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Offline Razor Concepts

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Re: micro servos
« Reply #7 on: April 29, 2009, 07:56:12 PM »
shipped from us should be about a week. From overseas is is 2 to 3 weeks.

Offline Indiana_Geoff

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Re: micro servos
« Reply #8 on: April 29, 2009, 09:17:16 PM »
I have used GWS micro servos in RC planes quite a bit.  Very inexpensive and they have not failed me.

Offline dellagdTopic starter

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Re: micro servos
« Reply #9 on: April 30, 2009, 06:28:12 AM »
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
it is really cheap and I really want a motor controller.
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Offline Razor Concepts

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Re: micro servos & motor controllers
« Reply #10 on: April 30, 2009, 06:51:27 AM »
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.

Offline dellagdTopic starter

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Re: micro servos & motor controllers
« Reply #11 on: April 30, 2009, 01:50:56 PM »
well then u have any suddgestions?
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Offline dellagdTopic starter

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Offline galannthegreat

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Re: micro servos & motor controllers
« Reply #13 on: April 30, 2009, 02:05:36 PM »
Something along these lines would work nicely:
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
Kurt

Offline dellagdTopic starter

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Re: micro servos & motor controllers
« Reply #14 on: April 30, 2009, 07:19:02 PM »
k cool
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Offline Webbot

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Re: micro servos & motor controllers
« Reply #15 on: April 30, 2009, 07:56:52 PM »
Sorry to keep 'banging on' but -  Solarbotics L298 and Pololu devices are supported by my library
Webbot Home: http://webbot.org.uk/
WebbotLib online docs: http://webbot.org.uk/WebbotLibDocs
If your in the neighbourhood: http://www.hovinghamspa.co.uk

Offline dellagdTopic starter

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« Last Edit: May 01, 2009, 05:09:32 PM by dellagd »
Innovation is a product of Failure, which leads to Success.

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Offline galannthegreat

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Re: micro servos & motor controllers
« Reply #17 on: May 01, 2009, 03:15:53 PM »
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.
Kurt

Offline dellagdTopic starter

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Re: micro servos & motor controllers
« Reply #18 on: May 01, 2009, 05:11:07 PM »
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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Offline galannthegreat

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Re: micro servos & motor controllers
« Reply #19 on: May 01, 2009, 06:35:24 PM »
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.
Kurt

Offline dellagdTopic starter

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Re: micro servos & motor controllers
« Reply #20 on: May 01, 2009, 08:02:38 PM »
k thanks
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Offline Admin

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Re: micro servos & motor controllers
« Reply #21 on: May 07, 2009, 05:27:20 PM »
I use the Futaba microservos. Look it up on the Futaba site.

 


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