Help Building Humanoid!

Discussions regarding building a walking robot at home. Most of the robots participating at Robo-One competitions are custom fabricated.
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Help Building Humanoid!

Post by robogeek3 » Mon Aug 02, 2010 8:20 am

Post by robogeek3
Mon Aug 02, 2010 8:20 am

I am planning to build a humanoid for $300 with:
9g servos
Control Board
Aluminum (to make brackets)

HELP:
WHERE CAN I BUY ALUMINUM AND WHAT CONTROL BOARD SHOULD I USE?
IM PLANNING 17 DOF
Links
I am planning to build a humanoid for $300 with:
9g servos
Control Board
Aluminum (to make brackets)

HELP:
WHERE CAN I BUY ALUMINUM AND WHAT CONTROL BOARD SHOULD I USE?
IM PLANNING 17 DOF
Links
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Post by roo » Mon Aug 02, 2010 9:17 pm

Post by roo
Mon Aug 02, 2010 9:17 pm

Assuming you're in the UK, I bought some 30mm wide strips of aluminium (1mm thick) as a custom sale from eBay:

http://myworld.ebay.co.uk/123offcuts/

They'll do custom-cut pieces to order, suited me fine.

What sort of servos are you going to use? This may steer you one way or the other when it comes to control boards etc.

If you're going to use 'standard'-control servos (i.e. RC pulse) then I'll have just the devices soon... 8)
Assuming you're in the UK, I bought some 30mm wide strips of aluminium (1mm thick) as a custom sale from eBay:

http://myworld.ebay.co.uk/123offcuts/

They'll do custom-cut pieces to order, suited me fine.

What sort of servos are you going to use? This may steer you one way or the other when it comes to control boards etc.

If you're going to use 'standard'-control servos (i.e. RC pulse) then I'll have just the devices soon... 8)
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Post by billyzelsnack » Mon Aug 02, 2010 9:47 pm

Post by billyzelsnack
Mon Aug 02, 2010 9:47 pm

If you're in the USA it's hard to beat use-enco.com for 5052 sheet aluminum.
If you're in the USA it's hard to beat use-enco.com for 5052 sheet aluminum.
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Post by Tyberius » Mon Aug 02, 2010 10:07 pm

Post by Tyberius
Mon Aug 02, 2010 10:07 pm

Nobody has the heart to tell him this is a pipe-dream?

A 17dof humanoid, regardless of how light you get the chassis, will not be able to support itself + controller + battery using those servos. Not trying to be a downer, just don't want you to waste $300.

There is no free lunch with humanoids.
Nobody has the heart to tell him this is a pipe-dream?

A 17dof humanoid, regardless of how light you get the chassis, will not be able to support itself + controller + battery using those servos. Not trying to be a downer, just don't want you to waste $300.

There is no free lunch with humanoids.
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Post by roo » Mon Aug 02, 2010 10:54 pm

Post by roo
Mon Aug 02, 2010 10:54 pm

I didn't spot the '9g' servos when I first replied - good point Tyberius.
I didn't spot the '9g' servos when I first replied - good point Tyberius.
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Post by i-Bot » Mon Aug 02, 2010 11:09 pm

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Mon Aug 02, 2010 11:09 pm

Take a look here at what Ayu did at reasonable cost with 9g servos. At least it will set your expectations for these servos.

http://robosavvy.com/forum/viewtopic.php?t=2427
Take a look here at what Ayu did at reasonable cost with 9g servos. At least it will set your expectations for these servos.

http://robosavvy.com/forum/viewtopic.php?t=2427
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Post by Tyberius » Mon Aug 02, 2010 11:15 pm

Post by Tyberius
Mon Aug 02, 2010 11:15 pm

i-Bot wrote:Take a look here at what Ayu did at reasonable cost with 9g servos. At least it will set your expectations for these servos.

http://robosavvy.com/forum/viewtopic.php?t=2427


That's actually fairly impressive!

Two questions- onboard battery? Did he ever get it to actually walk?

Again, not trying to be negative here, just realistic.
i-Bot wrote:Take a look here at what Ayu did at reasonable cost with 9g servos. At least it will set your expectations for these servos.

http://robosavvy.com/forum/viewtopic.php?t=2427


That's actually fairly impressive!

Two questions- onboard battery? Did he ever get it to actually walk?

Again, not trying to be negative here, just realistic.
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?????????????????

Post by robogeek3 » Tue Aug 03, 2010 2:02 am

Post by robogeek3
Tue Aug 03, 2010 2:02 am

I will try. If its successful I'll post reply.
I will try. If its successful I'll post reply.
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Post by mog123 » Thu Aug 05, 2010 9:50 am

Post by mog123
Thu Aug 05, 2010 9:50 am

Tyberius wrote:
i-Bot wrote:Take a look here at what Ayu did at reasonable cost with 9g servos. At least it will set your expectations for these servos.

http://robosavvy.com/forum/viewtopic.php?t=2427


That's actually fairly impressive!

Two questions- onboard battery? Did he ever get it to actually walk?

Again, not trying to be negative here, just realistic.


Well doing a 1-legged stand could mean he got it to walk. On the movie you can see the batteries are sitting on the table in the back, But I think he could manage a 7.4v 900mah lipo battery
Tyberius wrote:
i-Bot wrote:Take a look here at what Ayu did at reasonable cost with 9g servos. At least it will set your expectations for these servos.

http://robosavvy.com/forum/viewtopic.php?t=2427


That's actually fairly impressive!

Two questions- onboard battery? Did he ever get it to actually walk?

Again, not trying to be negative here, just realistic.


Well doing a 1-legged stand could mean he got it to walk. On the movie you can see the batteries are sitting on the table in the back, But I think he could manage a 7.4v 900mah lipo battery
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Post by i-Bot » Thu Aug 05, 2010 10:32 am

Post by i-Bot
Thu Aug 05, 2010 10:32 am

I did not hear from Ayu in quite a long time, so never saw it walk.
The video of the 1 leg butterfly compared to that of the Robonova, does not look as strong, but I think some walking action could be achieved.

The barriers to walking are not just physical. To develop gaits for a new robot is a long demanding task. Especially when using servos like these where the current position cannot be read.

It is an interesting mirror to previous thread on scaling up robots and whether the servo torque to size ratio is linear.

I hope someone gets this working
I did not hear from Ayu in quite a long time, so never saw it walk.
The video of the 1 leg butterfly compared to that of the Robonova, does not look as strong, but I think some walking action could be achieved.

The barriers to walking are not just physical. To develop gaits for a new robot is a long demanding task. Especially when using servos like these where the current position cannot be read.

It is an interesting mirror to previous thread on scaling up robots and whether the servo torque to size ratio is linear.

I hope someone gets this working
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