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Spartan001
08-13-2009, 11:13 AM
Here is a link to a great deal on airsoft weapons for a mech. It has a high rate of fire and is small enough to be mounted on a mech and had a full auto option. http://www.airsplat.com/Items/ERM-WELL-R4-MP7.htm:mad:

lnxfergy
08-13-2009, 11:24 AM
First off, your link was broken, I assume you meant http://www.airsplat.com/Items/ERM-WELL-R4-MP7.htm

So then, I'm not certain this "small enough to be mounted on a mech", the specs are severly lacking but it looks like a 540 motor with a metal gearbox, thats a LOT of weight for most mechs.

IMHO, I'd suggest posting a review of said gun on a mech before recommending it to people.

-Fergs

Spartan001
08-13-2009, 11:33 AM
Thanks

Adrenalynn
08-13-2009, 11:41 AM
I actually have an R4-MP7 as a backup weapon for Airsoft. They're 4+lbs empty. That would be one BIG mech! They're pretty nice guns though - for *really* big bots and able-bodied humans of average size and strength.

mannyr7
08-13-2009, 04:35 PM
It's too purty to cut the stock and grip off! :p

Adrenalynn
08-13-2009, 05:24 PM
You won't get it under ~2.5lbs no matter how much gutting you do. It has a nice gearbox with a big arse drill motor.

nuggy
08-20-2009, 04:42 AM
im thinking you could drop an arm and just mount that stripped sucker right on a shoulder, perhaps counter-weight the ammo 'magazine' ?!

DresnerRobotics
08-20-2009, 09:44 AM
im thinking you could drop an arm and just mount that stripped sucker right on a shoulder, perhaps counter-weight the ammo 'magazine' ?!

Still entirely way too heavy for a biped, especially mounted on one side of it. 4lbs on one side of a biped is game over.

Possible if you built a quad using RX-28s or better, and the gun was mounted at the COG.

darkback2
08-20-2009, 10:25 AM
I have actually been thinking of swapping the arm on a humanoid for tank guns...it would make getting back up if you fell down pretty hard...but depending on how much the guns and ammo weight you might able to keep more than just the shoulder joint.

Of course if it were really that easy someone would have done it already...so I'm thinking there must be more to it....Oh yeah...the camera target plates, scoring card, and a bigger battery...yeah...

DB

mannyr7
08-20-2009, 09:15 PM
http://forums.trossenrobotics.com/gallery/files/2/8/4/0/photo1.jpg

I don't fall down and payload is no longer an issue.

gdubb2
08-20-2009, 09:30 PM
Go Manny Go.. Looks great.

Gary

darkback2
08-20-2009, 09:30 PM
That thing looks sweet has all get out Manny!

You really going into battle with that flag on there? Also where are your hoppers?

Sweet!

DB

mannyr7
08-20-2009, 10:39 PM
Thank you, thank you! Haven't settled on a hopper design yet and that arm just ends in a 'c' bracket that the actual gripping claw will attach to. I have it mocked up in cardstock on my desk, just need to form it up in the garage. Whew! It's been 111F lately. I lose ten pounds everytime I go out there! Maybe this weekend...But its nice going barefoot in the winter, LOL

DresnerRobotics
08-20-2009, 10:55 PM
Whoa, I'm liking it.

All leg servos upgraded to 5990s now?

mannyr7
08-20-2009, 11:21 PM
Whoa, I'm liking it.

All leg servos upgraded to 5990s now?

Not necessary. But the Defender generates so much torque from recoil that the head pan wants to rotate rearward. That's with the head as yet un-powered. The HS-645mg used should hold, with some oscillation predicted. Balancing springs might help out here. I don't see any problems with head tilt, as COG is perfectly balanced in that axis. Arm and Defender are very equally balanced as well. Arm needs a claw and gun needs hopper+ammo. So a li'l clever engineering will maintain this balance.

I'm so terrible at keeping surprises!;)

robokoi
08-21-2009, 06:11 AM
Nice design, but where do you intend to put the target plates that won't block the camera or get knocked by the legs, on top?

mannyr7
08-21-2009, 03:39 PM
Nice design, but where do you intend to put the target plates that won't block the camera or get knocked by the legs, on top?

Clear lexan plates covering the front and rear of the head/torso.

Adrenalynn
08-21-2009, 05:40 PM
Remember that you don't get to build the target plates next year... Those are being standardized.

mannyr7
08-21-2009, 09:02 PM
Remember that you don't get to build the target plates next year... Those are being standardized.

Right you are! Forgot about that. :sad: They'll mount above the head if need be, billboard-style. :tongue:

RevBryce
08-21-2009, 10:02 PM
Nice bot.
Love the hip design.
And keep the flag so i now where you are.
So i can run the other way:)

Adrenalynn
08-21-2009, 11:14 PM
I definitely think you need to keep the flag.

If you do, I'll have to defend it and sit overwatch for your 'bot. I'll bring my little airgun (http://www.gamousa.com/product.aspx?product=Socom%20Extreme&productID=315)... ;)

RevBryce
08-22-2009, 01:59 AM
"If you do, I'll have to defend it and sit overwatch for your 'bot. I'll bring my little airgun (http://www.gamousa.com/product.aspx?product=Socom%20Extreme&productID=315)... ;)"

Oi ,since when can you do that?
:eek:

Adrenalynn
08-22-2009, 03:00 AM
You just don't know me very well yet... ;) It's "only" a spring powered airgun...

It's an American Flag flying 'bot belonging to an American Soldier... We have to bear in mind any moral imperatives. :)

Don't worry, a couple quarter-inch thick sheets of Lexan with an airgap will stop it. Although with Armor Piercing PBA (http://www.gamousa.com/product.aspx?product=ARMOR%20/%20PBA%20Pellets%20.177%20Qty.%2080&productID=300) ya might have to go a couple half-inch with airgap... ;)

RevBryce
08-22-2009, 04:36 AM
You guys get all the fun stuff to play with.

robokoi
08-22-2009, 08:56 AM
You just don't know me very well yet... ;) It's "only" a spring powered airgun...

sounds like you've upped the ante on the hardcore class!

Spartan001
08-22-2009, 04:57 PM
nice mech dude !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! what is the microcontroller and do you use xbee?

mannyr7
08-22-2009, 06:42 PM
Thanks fer getting my back, Adren. You take your airsoft seriously! That's a killer rifle!

Thanks, Spartan! Right now I have a LM Botboard II with Basic Atom Pro 28 linked to a wireless 2.4gHz PS2 controller. This all still needs to be programmed tho, as I transition from my SSC-32. Once I have my movement behaviors working, I plan to ditch the wireless controller for a wired one and a second BBII/BAP combo linked to Clyde via XBee. That's the plan anyways...

rebel
11-15-2009, 02:18 PM
Can someone tell me the size for the aluminum tubing used for the small tank guns. Thankyou :p

Adrenalynn
11-15-2009, 02:28 PM
The ID has to be the same size + a little bit as the ammo you're planning on firing. The OD can be anything larger than that.

Since airsoft tends to be 6mm, the barrels tend to have an ID from 6.04-6.09mm

gdubb2
11-15-2009, 02:35 PM
Hey Rebel,
Figure the BB's are 6mm (0.236 in.)

I made my barrels from 0.5 in. round stock and bored them with a size "C" drill bit (0.242 in.) A size "B" bit is 0.238 in. I think some of the guys found some tubing, but don't know where. Some just got the plastic barrels that fit. I preferred to make them so I could machine in a flange to mount them to the gun.

The "C" bit actually bored a little on the small size 0.239, but that was just right. You might find some tube on the small side and rebore them larger..

Found this at McMaster-Carr..Aluminum Tubing 5/16" OD, .24" ID, .035" Wall Thickness, 6' Length. #89965K43 .

Good luck
Gary

rebel
11-16-2009, 11:34 AM
Thanks for info :D