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Author Topic: Actuator  (Read 2594 times)

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Offline crarmTopic starter

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Actuator
« on: January 25, 2009, 11:07:14 AM »
I am building a movable robotic arm and the arm weighs about 1~2 lbs so would what would I use to lift the arm up and down. I dont want to spend $100+ on a servo that would lift it so what would I use.... an actuator?
Plz help.

Offline HDL_CinC_Dragon

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Re: Actuator
« Reply #1 on: January 25, 2009, 12:30:48 PM »
Well the amount your going to have to pay depends on how many Degrees of Freedom(DOF) you want your robotic arm to have. Different strength servos/actuators will be needed for different parts of the arm. Describe your arm a little bit better.

example:
"The base can turn 360° on the Y-Axis. The arm can move 90° up and down on the Z-Axis at the base. There is a single elbow that can turn 180° on the X axis and 180° on the Z-Axis. Then at the end is the hand which can turn 360° on the X-Axis at the wrist."

-EDIT-
Axis description when looking from the front:
X: Side to side
Y: Top to bottom
Z: Forward and back

-EDIT-
Sorta like this:

(Click for bigger view)
« Last Edit: January 25, 2009, 12:37:36 PM by HDL_CinC_Dragon »
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Offline crarmTopic starter

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Re: Actuator
« Reply #2 on: January 25, 2009, 05:35:07 PM »
Well this arm is actually going to have a small rototiller at the end. Its not very big.. its more like a prototype. So i want the base to spin 360. The arm does not have a pivot point in the middle. It is pretty much a bent steel bar. The rototiller will be able to tilt up and down to adjust to differnet ground levels.

Offline HDL_CinC_Dragon

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Re: Actuator
« Reply #3 on: January 25, 2009, 07:53:47 PM »
Rototillers are not light at all. If you really want to have an "arm" to raise and drop this thing, your going to have to go hydraulic.
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Offline crarmTopic starter

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Re: Actuator
« Reply #4 on: January 25, 2009, 08:27:16 PM »
The rototiller itself weighs very little compared to the motor that turns it. You don't think we could use an actuator to raise and lower? ???

Offline HDL_CinC_Dragon

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Re: Actuator
« Reply #5 on: January 25, 2009, 08:30:20 PM »
Rototillers are typically just a motor with spinning spikes attached to it more or less. Are you saying yours has a motor that is not directly attached to it? Perhaps pictures of what youre trying to do would help
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Offline crarmTopic starter

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Re: Actuator
« Reply #6 on: January 26, 2009, 07:43:00 AM »
this rototiller is very small. The motor of it is really just a small 7.2 volt socket drill. It has a lot of torque and descent speed. This thing only weighs 1-2 pounds. do you still think we need hydroulics.Do you think we could put a actuator under the arm to lift it up and down instead of having a pivot point on the arm that would take all of the weight. wouldnt it be easier to lift from the bottom than a pivot on the arm.

Offline HDL_CinC_Dragon

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Re: Actuator
« Reply #7 on: January 26, 2009, 04:03:58 PM »
... so this is an electric rototiller?... are we talking about the same device here?
http://www.gardenlines.co.uk/CMS/Uploads/Products/Ardi%20Badger%203365%20L.jpg
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Offline crarmTopic starter

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Re: Actuator
« Reply #8 on: January 26, 2009, 07:14:37 PM »
umm..... no. think of the rototiller as the size of a pop can with blades. the actual base of the robot is 4"x12"

Offline HDL_CinC_Dragon

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Re: Actuator
« Reply #9 on: January 26, 2009, 08:50:39 PM »
Im confused... picture.
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Offline Admin

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Re: Actuator
« Reply #10 on: February 03, 2009, 01:56:40 AM »

Offline crarmTopic starter

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Re: Actuator
« Reply #11 on: February 03, 2009, 07:03:29 PM »
We dont have any pictures because we havent built it yet. but we did buy some actuators some i think we are good for now.

Offline HDL_CinC_Dragon

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Re: Actuator
« Reply #12 on: February 03, 2009, 10:32:20 PM »
I mean a picture of the rototiller. Or are you building that also? Perhaps a picture of something similar?
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Offline crarmTopic starter

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Re: Actuator
« Reply #13 on: February 04, 2009, 12:10:42 PM »
Right now I'm at school but once i get home ill put a picture out here so you can critique it.

Offline crarmTopic starter

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Re: Actuator
« Reply #14 on: February 04, 2009, 09:33:40 PM »
Heres a picture of the rototiller part of it.

« Last Edit: February 04, 2009, 09:37:26 PM by crarm »

Offline DC-Electronics

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Re: Actuator
« Reply #15 on: February 04, 2009, 11:50:07 PM »
I hate to be a salesman, but the motors im currently selling for $15 each would likely do the trick :)

http://www.societyofrobots.com/robotforum/index.php?topic=6766.0
Motors and Electronics at a great price :)
Had to close my ebay store due to ebay shenanigans :(

Offline crarmTopic starter

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Re: Actuator
« Reply #16 on: February 12, 2009, 10:02:43 PM »
Any more suggestions? ??? ???

 


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