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Wazio
08-05-2009, 10:40 PM
Well, I figured I would start my own thread here to ask questions, post progress when I have some and overall just to have my own thread. So let the questions begin!

I have been giving this here chassis the eye ball (http://www.lynxmotion.com/Category.aspx?CategoryID=117 (http://www.lynxmotion.com/Category.aspx?CategoryID=117)), I really like the aesthetics of this kit, but I also think that it would work well for a weapons platform. The full kit priced at about $900 is defiantly inflicts a little sticker shock however the chassis only at about $100 is reasonable.

Would I have to use servos recommended by lynx? I prefer Airtronics servos over Hitec, plus I am sponsored by Airtronics so that would help in the ol pocket book area. Speaking of Airtronics, they really want to get more involved with robotics. I encourage the use of their products and should anybody have feedback to make their items more robot friendly please let me know.

Hmmm maybe I can outfit this thing with some super oober high power servos for some serous firepower.

Long term I would like to make a biped modeled after the games ‘Puma’ chassis, however I think it will be much easier to cut my teeth with something less fall happy. As such I will still lay a claim to the name Puma.

Wazio
08-05-2009, 10:41 PM
Also, I assume that mech talk/progress should be kept in the mech area, should this be in the wrong place would a mod please move me to the correct area?

Adrenalynn
08-05-2009, 11:19 PM
If you went with the 94359's you would have the torque on paper to get it walking and likely carrying enough weight for the mech class.

You could probably get away with those for the high-stress joints and something in the 133ozin range ( already closed the spec sheet or I'd look again) for the lower strain joints.

I'm not sure how accurate and noisy they are, ultimately that'd be something you'd need to experiement with.

mannyr7
08-05-2009, 11:20 PM
You could use Airtronics servos, but according to Jim at LM you need a 12 x HS-645 equivalent (133oz/in) and 6 x HS-475 (76oz/in) to move that chassis. Also of note:


Note, this robot, as cool looking as it is, does not have the payload carrying capability of the other hexapods available from Lynxmotion. There is a penalty for pivoting the joints on the servo output shaft alone.Looks like any of the ERG series could fit the bill. They are "standard" sized hobby servos with the required torque.
http://www.airtronics.net/specs/atxservospecs.pdf

jes1510
08-05-2009, 11:36 PM
Keep in mind that you will have to lift a gun, cam, extra brackets, extra servos, and bigger batteries. If 645's are just enough to lift the stock chassis then you may want to look at something bigger.

Edit: The designer of that kit hangs out around here. Perhaps he will poke his head in this thread.

Adrenalynn
08-06-2009, 02:30 AM
The 94359's I looked up are quoted at 200oz-in. So the spec would lead us to believe they're a little beefier than the HS645MG

darkback2
08-06-2009, 03:02 AM
You may want to wait. There is a hybrid phoenix that will come out at some point. Its just like the one you posted, only it has a slightly different leg design that might be able to help in the payload department.

http://www.youtube.com/watch?v=0FE3yAho1IA

Also, Welcome to the forum.

DB

robologist
08-06-2009, 03:03 AM
Has anyone looked at the physical height spec of the Airtronics 94359 versus the HiTec HS-645?

Ok, never mind, seems pretty close, 37 mm to 38 mm. Had an issue before when thinking of using Lynx brackets with some other servos.

Note also that the chassis kit still requires another $72 in servo brackets in addition to the $90 base. Wonder why it was set up that way?

Adrenalynn
08-06-2009, 03:38 AM
Good call on the measurements - and that I did, to make sure it was a "standard sized" servo. Seems to fall within the margin of error between my 5995TG and 645/475, so I decided it'd probably work - maybe needing a little "english" but close enough. :)

Wazio
08-06-2009, 06:45 AM
I am too also thinking that the 94395 might fit the bill, (http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXCHB2 (http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXCHB2)).

The hybrid looks like a good platform, wonder if they have any idea on the release time? An extra $70 of required brackets on top of the ‘kit’ also caused me to lift a brow, not sure what that’s all about. I suppose ill shoot LM an email and ask about the new bot, as ideally I would like to get the chassis sometime soon.

lnxfergy
08-06-2009, 06:57 AM
Note also that the chassis kit still requires another $72 in servo brackets in addition to the $90 base. Wonder why it was set up that way?

I think the kit includes only the "truly custom" parts that are Phoenix-specific (the leg parts, the body, etc), and so then the standard ASB brackets (I think they are for binding the coxa and femur servos) are not Phoenix-specific parts.

-Fergs

DresnerRobotics
08-06-2009, 09:24 AM
One thing you'll also want to keep in mind is the servo shaft spline. You pretty much *MUST* use the aluminum servo horns that lynxmotion offers to build the Phoenix, the plastic ones will not cut it, and these are only compatible with hitec-type splines.

Wazio
08-07-2009, 01:02 AM
http://www.amainhobbies.com/index.php/cPath/1_61_101 (http://www.amainhobbies.com/index.php/cPath/1_61_101)

Im sure I can find a metal horn on here somewhere, 2 side would work me thinks but if not then I can jet out an adaptor plate or something.

darkback2
08-07-2009, 01:13 AM
I'm sure you can come up with something...

I think Tyb's concern comes from the fact that the hitech metal servo horns are threaded so that you can screw the leg segments directly to the metal horns. Using different horns may mean making some sort of adaptor, or finding a way to get holes in the right places, and drill and tap them...but if you can just "jet one out" then your ahead of most people. Depending the servo horns might fit your servos.

DB

DresnerRobotics
08-07-2009, 01:23 AM
http://www.amainhobbies.com/index.php/cPath/1_61_101 (http://www.amainhobbies.com/index.php/cPath/1_61_101)

Im sure I can find a metal horn on here somewhere, 2 side would work me thinks but if not then I can jet out an adaptor plate or something.



Problem with those, is they're the wrong design and way overpriced :p

Jim from Lynxmotion did the hobby robot world a great favor by making these: http://www.trossenrobotics.com/store/p/5509-Hitec-Spline-Metal-Servo-Horn-Tapped-.aspx

For dirt cheap. You can pick them up at Lynxmotion or here at Trossen.

Wazio
08-09-2009, 12:23 AM
Yea, as I don’t plan on using Hitec servos making something custom will be my only option... A part this simple im not too worried about it.

xx2747
08-09-2009, 01:11 AM
hmm...
Airtronics... I've never looked at their servos before. I can't seem to find their prices - the towerhobbies ones are "discontionued"
Blue Bird servos look good. 13 kg of torque and under 0.18 sec of speed for $24

Ooh! ooh! This is my 100th post! woah... cool!

lnxfergy
08-09-2009, 01:15 AM
One thing to be careful with though, is that some Blue Bird or GWS servos are slightly oversized, I believe Lynxmotion has posted that the SES brackets don't work with many of them.

-Fergs