RoboSavvy Forum

What the heck are these?

2009-07-15T22:45:10+01:00

Joe wrote:
DerekZahn wrote:Here's an idea I was thinking of though: Suppose you use some sort of modeling clay or plastic or whatever. Then one could press the servos into it. Let it dry, then file/sand/mill the result so the dimensions are exactly as desired. Then use the result as a template for making a mold, then mold the final pieces out of plastic. With determination and a willingness to learn how to mold plastic I think it should be within the reach of a dedicated home builder, but it's certainly not easy!

That's probably the most practical approach. OmniZero has a lot of other plastic parts that are probably molded too — all those curved panels and so on. I've research home plastic molding a bit, and it's all doable, but as you say, not easy. There are some great instructional videos online at http://tapplastics.com.

Best,
— Joe

this is same plastic molding we did last to my prototype sneak robot

_________________
Micro molding

Statistics: Posted by janrozz — Wed Jul 15, 2009 10:45 pm

A possible way to make servo enclosures at home?

2009-02-06T12:41:14+01:00

Hi everyone (i've just joined, although I've been reading the forums with a lot of interest for some time ).

I have been looking at the impressive image provided by DerekZahn of an exploded view of some kind of servo enclosure. (here's the image link again) http://www.1mm.jp/m/robo20060710b.jpg

Although it looks a very complex design, it maybe possible to make it at home, as it does look like (when each side is laid flat), it could be mostly machined on a (home made?) CNC machine with a small cutting tool. Then the drill holes added after the CNC work, to finish off the design.

The thing that makes me think it could be done with CNC, is that every edge is vertical, when each side is laid flat.

I'm wondering if the finished metalwork also isn't exactly like this CAD drawing? ... as a CNC cutting tool wouldn't give V shape corners in the few places they are used in the drawing. (So they would end up U shaped, which would still work, I guess).

Anyway, thats just some thoughts on it.

Statistics: Posted by Mr Flibble — Fri Feb 06, 2009 12:41 pm

What the heck are these?

2009-02-03T16:37:39+01:00

How to do the C bracket ?

Statistics: Posted by dig — Tue Feb 03, 2009 4:37 pm

What the heck are these?

2009-02-03T08:22:29+01:00

modeling a plastic is a good thing for a robot... some prototypes are greatly made from molded plastic.... some rapid industries are great for this..

_________________
Rapid Manufacturing

Statistics: Posted by bengomez — Tue Feb 03, 2009 8:22 am

What the heck are these?

2006-10-01T04:53:25+01:00

If some one needs more gripper torque then they can get all the way to 40 kg-cm (ouch - they don't call me "Fingerless" for nothing) without any mods.

Yeah, those'd be more for a can-opener/crusher appendage. If Combots ever mixes with Robo-One.... that may be the route we'd want to take (that, or equipping beermat's saw-blade hands)

Another factor to consider is that the 4xxx servos have connectors instead of being hard wired. You can replace a servo without having to worry about all the tangle and routing. It might allow you more freedom with design choices.

Oh I know, I love these things.
They've thought of it all... like they build humanoids or something

Statistics: Posted by bauermech — Sun Oct 01, 2006 4:53 am

What the heck are these?

2006-09-30T23:39:14+01:00

bauermech wrote:
Add additional DOF - especially grippers... (know anyone that might be able to advise...?

I still "owe" you a pair. I have a KRS-4024 servo to model from. Whould that be the best servo to use in your opinion?

If you're thinking about scaling up the grippers to sell for use with the MANOI AT01, then the 4024 is an excellent choice since the other 4xxx servos have the same dimensions. If some one needs more gripper torque then they can get all the way to 40 kg-cm (ouch - they don't call me "Fingerless" for nothing) without any mods.

Another factor to consider is that the 4xxx servos have connectors instead of being hard wired. You can replace a servo without having to worry about all the tangle and routing. It might allow you more freedom with design choices.

Statistics: Posted by tempusmaster — Sat Sep 30, 2006 11:39 pm

What the heck are these?

2006-09-30T17:15:18+01:00

Add additional DOF - especially grippers... (know anyone that might be able to advise...?

I still "owe" you a pair. I have a KRS-4024 servo to model from. Whould that be the best servo to use in your opinion?

Statistics: Posted by bauermech — Sat Sep 30, 2006 5:15 pm

What the heck are these?

2006-09-30T16:16:20+01:00

bauermech wrote:
He must use a LiPo Batt and carbon fiber to keep Omnizero so light. That seems to be his only weakness in the wrestling matches...

I think he's using Ni-MH's in his chest. It threw me off to see him up close. OmniZero was much larger than I expected.

I'm more interested in home-built robots than commercial ones.

I am too, but a kit is a good way to get you started with a microcontroller and a pile of servos. I've found it's usually cheaper to by a kit than all the important parts seperately. The rest is just extra, but I can eventially find a use for it.

I cannot resist... the MANOI AT01 will probably be the next bot I buy. I'm so jelous you already get to "play" w/ one Lem

Of course, it wasn't all just play.

The next steps?

Statistics: Posted by tempusmaster — Sat Sep 30, 2006 4:16 pm

What the heck are these?

2006-09-29T21:19:30+01:00

He must use a LiPo Batt and carbon fiber to keep Omnizero so light. That seems to be his only weakness in the wrestling matches...

I think he's using Ni-MH's in his chest. It threw me off to see him up close. OmniZero was much larger than I expected.

I'm more interested in home-built robots than commercial ones.

I am too, but a kit is a good way to get you started with a microcontroller and a pile of servos. I've found it's usually cheaper to by a kit than all the important parts seperately. The rest is just extra, but I can eventially find a use for it.

I cannot resist... the MANOI AT01 will probably be the next bot I buy. I'm so jelous you already get to "play" w/ one Lem

Statistics: Posted by bauermech — Fri Sep 29, 2006 9:19 pm

What the heck are these?

2006-09-29T18:03:52+01:00

tempusmaster wrote:
Something like this MANOI AT01 article? The extended version article runs 5 full pages and is scheduled for the next issue.

Yeah — though personally, I'm more interested in home-built robots than commercial ones. I generally assume that commercial robots use all sorts of fancy tooling & special parts that I won't be able to get, and that home-built robots are more likely to use parts and techniques I could conceivable use as well.

Best,
- Joe

Statistics: Posted by Joe — Fri Sep 29, 2006 6:03 pm

What the heck are these?

2006-09-29T16:12:00+01:00

tempusmaster wrote:
I haven't been able to confirm the exact data on the current design, but he has been using the JR DSR8801 servos (Torque: 28.5kg-cm, Speed: 0.14s/60 degrees) in the past.

*Deep Bow*

Thank you sir...

He must use a LiPo Batt and carbon fiber to keep Omnizero so light. That seems to be his only weakness in the wrestling matches...

^_^

Statistics: Posted by MYKL — Fri Sep 29, 2006 4:12 pm

What the heck are these?

2006-09-29T14:47:26+01:00

Joe wrote:
Thanks for the information; it's both informative and inspiring.

Thanks. You're very welcome. It's my pleasure.

One of those magazines recently had such an article on Rook's Pawn,

That would be the excellent article that Matt wrote for ROBOT Magazine. I'm very glad that they didn't crop the photo any tighter or you wouldn't be able to see the logo on the knees.

but I suspect that since most of the other editors/writers are here in the U.S., they're not going to be able to do the same for Japanese bots. You're uniquely positioned to do that.

Something like this MANOI AT01 article? The extended version article runs 5 full pages and is scheduled for the next issue.

Statistics: Posted by tempusmaster — Fri Sep 29, 2006 2:47 pm

What the heck are these?

2006-09-29T14:26:09+01:00

MYKL wrote:
These are great photos of Omnizero. Does anyone know what servo-motors are used in those boxes?

I haven't been able to confirm the exact data on the current design, but he has been using the JR DSR8801 servos (Torque: 28.5kg-cm, Speed: 0.14s/60 degrees) in the past.

Statistics: Posted by tempusmaster — Fri Sep 29, 2006 2:26 pm

What the heck are these?

2006-09-29T14:20:10+01:00

Thanks for the information; it's both informative and inspiring.

On Usenet I suggested you occasionally add a profile of a particular bot to robots dreams. I still think that's a great idea, but another one just occurred to me: you could write these up, with good photos and diagrams, and easily make a 4-page article for Servo or Robot on each one. That pays something like $400, so it might be worth your time to even go to these guys and do a quick interview, and ask for a screen shot of their CAD plans or whatever.

One of those magazines recently had such an article on Rook's Pawn, but I suspect that since most of the other editors/writers are here in the U.S., they're not going to be able to do the same for Japanese bots. You're uniquely positioned to do that. (Just get somebody to look over your copy and make sure you're using "it's" and "its" correctly. )

Cheers,
— Joe

Statistics: Posted by Joe — Fri Sep 29, 2006 2:20 pm

What the heck are these?

2006-09-29T04:42:10+01:00

Joe wrote:
DerekZahn wrote:This builder is a master! I am borrowing some ideas from that robot (OmniZero) for the one I'm building now (but less sophisticated of course).

Oh, so this is the famous OmniZero! I'd heard about it, but never seen it (or didn't recognize it when I saw it) before. Thanks for the identification.
DerekZahn wrote:
http://www.1mm.jp/m/robo20060710b.jpg

Wow! How does a home-builder go about making an enclosure like this? I understand how to draft and laser-cut plastic, but these pieces are three-dimensional — there are holes in the sides, and various indentations and protrusions on the inside to firmly mate with the servos. To have a part like this made on e-Machines would cost a fortune. Any suggestions?

A little background:

1- Maeda is a pro. He works for Vstone, and is one of the members of TEAM OSAKA (RoboCup).

2- The current OmniZero is the 10th robot in the "Omni" series that he's designed and built. On average he has redesigned his robot every six months for the subsequent ROBO-ONE competition. If you compare his early robots with the current version the evolution is pretty striking. He keeps trying, making mistakes, learning from them, and evolving.

3- Most of the bodies for robots like this, including Dynamizer (Sugiura) are designed in 3D on CAD systems and then machined using a small Roland milling machine.

Other builders here in Japan use less sophisticated techniques but still produce excellent results. Nao Maru, who won the ROBO-ONE 10 competition, uses vacuum formed plastic for the King Kizer series body shells and put together most of the equipment buying stuff at the 100 yen (dollar) store.

Here's another example:

The 8 inch tall robot on the left is a full custom design completely built by hand without any special machine tools by a couple students at the university near us. The one on the right was made out of wood. Asurada (Layred-X) built his ROBO-ONE J (August) entry by cutting and heat bending sheets of clear plastic.

It's really dependent on how much time, effort, creativity and dedication you want to put into it. Having sophisticated equipment helps, of course, but isn't a absolute requirement.

Statistics: Posted by tempusmaster — Fri Sep 29, 2006 4:42 am