Well, you'll need at least one servo for the open/close part of things.· You probably should also have an IR detector to tell when something is between the gripper.· I guess you'll need some halfway decent metal fab skills.· Although I have seen people build these out of some strange things that still worked.
▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔ Chris Savage Parallax Tech Support csavage@parallax.com
With 5 servos you can make a reasonably good working, and great moving robot arm, 1 for open/close the gripper, 1 for rotating the gripper-as you rotate your hand when you serve soda-, 1 for the "knees", 1 for making the arm up or down-as your shoulder-, and 1 for rotating the arm himself.
I'll try to make you a schem, for greater explanation.
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Rien n'est plus proche du vrai que le faux
Lynxmotion has a new setup with tubing [noparse][[/noparse]which can be cut to nearly any desired length] that is a great arm. They seem to be a leader in the servo hardware department.
As far as gripping soda cans, having a pair of grippers modified to near to the radius of the cans will be a great benefit.
Sadly, they are a little odd about shipping overseas [noparse][[/noparse]wanted me to wire money to them directly [noparse][[/noparse]cost $30USD] rather than use my credit card]. If your in the U.S.A. or Canada, it shouldn't be a problem.
I made the tubing myself (pretty easy), but stocked up on the brackets and other stuff to connect the tubing.
Sadly, they are a little odd about shipping overseas
Try Phidgets USA. They sell the Lynxmotion brackets and tubing and ship Internationally. Surprisingly, they sell at the same price instead of a horribly inflated price like some others.
·I would be careful of lynxmotion products. There arms and arm kits are not load balanced and have little capability of lifting anything over 3 oz. which is very close to a servos stall torque. Also, how much reach do you need? The longer the arm, the more torque your going to need to offset the length of the arm as a fulcrum point and the weight at the end of the gripper (including the gripper).
·Without a load balance arm (an arm with counter weights or pressure equivilent to the weight of the·forarm, the servo in the elbow will work way too hard and burn out fast!·Another issue with their arms is that when they extend, they cannot retract and stall becouse of the load balance issue.
Comments
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Chris Savage
Parallax Tech Support
csavage@parallax.com
I'll try to make you a schem, for greater explanation.
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Rien n'est plus proche du vrai que le faux
Albert Einstein
http://www.lynxmotion.com/Category.aspx?CategoryID=73
Hope this helps.
As far as gripping soda cans, having a pair of grippers modified to near to the radius of the cans will be a great benefit.
Sadly, they are a little odd about shipping overseas [noparse][[/noparse]wanted me to wire money to them directly [noparse][[/noparse]cost $30USD] rather than use my credit card]. If your in the U.S.A. or Canada, it shouldn't be a problem.
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G. Herzog in Taiwan
Worth tring it, believe me...
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-Rule your Destiny-
--Be Good. Be Bad. Be Provas--
Sadly, they are a little odd about shipping overseas
Try Phidgets USA. They sell the Lynxmotion brackets and tubing and ship Internationally. Surprisingly, they sell at the same price instead of a horribly inflated price like some others.
Kenny
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Kenny Gardner
GAP Development Company
http://www.gapdev.com/
·
·Without a load balance arm (an arm with counter weights or pressure equivilent to the weight of the·forarm, the servo in the elbow will work way too hard and burn out fast!·Another issue with their arms is that when they extend, they cannot retract and stall becouse of the load balance issue.
·Alex
You mean like the springs in this picture?
Kenny
Post Edited (Kenny Gardner) : 9/28/2005 7:23:31 PM GMT
This coming from a competitor, of course.
Oh well. I, myself, enjoy working with the Lynxmotion brackets. In fact, right now I'm putting together some of the new Robot Hands I just bought.
They may be "chincy"·(being "plastic" and all) but they sure do look cool
Kenny
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