Low cost Robot Hand (with only one motor)

Other Hardware Robotics
21

Hi ndrplz

I was wondering if you could have a look at my post 3 Fingered Domestic Robotic Gripper (Uni Final year project) microcontroller in project guidance as you seem to have a good knowledge of robotics.

Thanks

22

JimboZA:
Attached is a pic of my proof-of-concept finger based on ndrplz's video.

I was surprised at how much force it takes to curl the finger: servo sounded like it was straining and was drawing about half an amp.

I'm very happy you took the idea :slight_smile:

To curl all the five fingers, I used this servo:
http://www.servocity.com/html/hs-645mg_ultra_torque.html

It's quite a good and powerful RC servo! (I never tested how much current does it draw, actually)

The idea of the electric clamps is good...
Also, can I ask you what kind of material the base is? Looks like a stone, but I think must be some kind of wood... :roll_eyes:

23

benjamin_m_obrien:
I was wondering if you could have a look at my post 3 Fingered Domestic Robotic Gripper (Uni Final year project) microcontroller in project guidance as you seem to have a good knowledge of robotics.

Hi, my knowledge of robotics is smaller than you probably think :slight_smile:
Anyway I'll gladly take a look to your post as soon as i have some time!

24

Looks like a stone, but I think must be some kind of wood...

Yep it's an upside-down-box. It's some kind of composite wood.... a bit like balsa but harder, I think it might be called superwood or something? It's a bit like really hard cardboard actually, about 4-5mm thick. It can by cut with a Stanley knife as long as the blade's good. Box is about A5 size and 25-30mm deep.

That HS-645 servo is about twice as torquey as mine: 7.7-9.6 kg cm vs 3.8-4.3 on my HK15138. According to that link, the HS-645 draws 1/3 to 1/2 an amp even under no-load.