Weapons

[hellsplumber]

I need a weapon for my bot. I want something quite simple to build that wont bankrupt me and that can dish the damage :P
Maybe a spinning bar?
If so,how would I go about making one and where do I get the supplies needed?
Ive also been told that lifters are quite easy and can be acomplished with a drill motor.I really had my heart set on a lifter but If its really hard or expensive then il forget it for the mean time.Any suggestions?
Bear in mind I dont have a welder :sad:
Thanks

[RogueTwoRobots]

Weapons

If you have your heart set on a lifter then youre pretty much in luck - they arent too difficult to build - infact a spinning bar is harder (many factors to get right, such as weapon strength, secure attachment to drive mechanism, plus the fact its kinda dangerous to test it in your kitchen) whereas a lifter can be built from existing parts and can be tested anywhere safely. Two options - one would be getting hold of a car scissor jack (£5 from a breakers yard) and attaching the threaded rod to a drill. Gives plenty of strength to lift a feather and it moves at a reasonable speed as well. Other parts of the scissor jack can be used in your lifting mech as well.

The other option is an electric window mechanism (the type which has a range of teeth on them - http://www.innerauto.com/includes/images/Inner_Auto/Honda_Parts/Honda_Parts_New/Honda_Window_Reg.jpghttp://www.innerauto.com/includes/im...nda_Parts_New/ Honda_Window_Reg.jpg). These have been used successfully in several feathers (although its been a while since) and can again easily lift a 12kg bot. Theyre available again at breakers yards or even on eBay - thats where I got mine to form the srimech mechanism on one of my new feathers. You dont need the whole mech as shown in the picture either, just really the motor, the 1/4 gear part and - if you want to utilise it as part of your lifter - the long arm attached to the 1/4 gear too. The fact that these usually have the drive mechanism contained as well means theyre less likely to fall apart.

Hope that is of some help

[psycho_fling]

Weapons

Lifters are extremely easy to build, ive built one using a drill motor and the zeobot lifter mech off technobots

[armadrillo]

Weapons

Jamie you have mail

[hellsplumber]

Weapons

The siccor jack method seems easiest
How does it lift a bot tho? Wouldent they have to drive ontop?

(Message edited by HellsPlumber on January 15, 2007)

[hellsplumber]

Weapons

Also,could you suggest a simple and cheap damaging weapon? Incase they can selfright or are invertable

[Guest]

Weapons

http://www.robowars.org/wikka/ElectricAxeWeaponshttp://www.robowars.org/wikka/ElectricAxeWeapons
Maybe a little heavy for a pommy robot, but its cheap and easy to build.

[hellsplumber]

Weapons

Thanks.
do those axes do alot of damage or just a dint or to?

[grant_ploughbot]

Weapons

It depends on the armour of the robots its against. Its starting to get very, very difficult to damage the new Hardox robots with any form of weapon!
It will depend alot on the shape and weight of the axe head aswell. You could even use a more powerfull motor to make the axe hit harder.

[Guest]

Weapons

http://www.youtube.com/watch?v=BsC5gON85Uwhttp://www.youtube.com/watch?v=BsC5gON85Uw

I dont know about doing too much damage, but it deffently gets everyone on your side. And its a lot of fun.
I wouldnt want to use a bigger motor. Youll either end up with the current draw being too high or putting in too much torque and not being able to keep your robot on the ground. Lighter weapons would fix that but then you wont be doing as much damage or be as entertaining.
And Ive found that hammers do more damage then axes or picks.

[hellsplumber]

Weapons

Thanks guys,I diddent think that a hammer would work better than a axe
Can some one give an answer to my scissor jack question?I need to know how It would lift to see how it should be mounted.
Thanks everyone!

[RogueTwoRobots]

Weapons

Ok, scissor jack lifting methods:

Obviously the shape of your robot affect how you integrate the mechanism into your bot but Ive done a couple of setups based on standard lifting shapes (excuse the crudeness of the drawings - but Im only half awake :P)

The basic setup that I would probably use is similar to this: http://i31.photobucket.com/albums/c367/ayrshirerobotics/lift_1.jpg?t=1169006215http://i31.photobucket.com/albums/c3...g?t=1169006215

The threaded rod is attached to your motor. The rod threads into the nut (which comes as part of the lifting jack mech - usually at one of the pivot ends) and the nut, which if I remember rightly has a bolt on either side of it, is bolted to the lifting arm. As the motor rotates the rod, it causes the nut to move up and since the arm is pivoting at the back, this causes the front end to rise - and you have your lifter.

Its also possible to have your lifting arm as a straight arm rather than having the angle in it:
http://i31.photobucket.com/albums/c367/ayrshirerobotics/lift_2.jpg?t=1169007350http://i31.photobucket.com/albums/c3...g?t=1169007350

This would restrict the travel a bit, but would allow you to have a more shallow robot (if your design suits it). As to the optional part in the drawing - I reckon it would work with both a pivoted point there or a fixed point, although the nature of the lifting arm would change I think (could someone clarify this?)

The third option I sketched up is the same as above except that the lifting arm pivot point has moved to the front so the lifter operates Cassius style:
http://i31.photobucket.com/albums/c367/ayrshirerobotics/lift_3.jpg?t=1169007875http://i31.photobucket.com/albums/c3...g?t=1169007875

Again travel is limited and it means you have to get the whole bot on top to stand any chance of lifting them. Although, the mechanism the zeobot uses gets far more travel from a similar setup, but I cant remember exactly what the arrangement is.

Hope that is of some help,
Jamie

[hellsplumber]

Weapons

That was LOADS of help,really apreciate the pics too
One more question,does it require welding?

[grant_ploughbot]

Weapons

I dont know what resources you have to work with, but i will put a picture on my profile of how I have made Ploughbots lifting mechanism. Its more than powerfull enoughto lift two feathers, and its very quick (the lifter in picture uses a 12v gold motor, over volted to 24v, but i now use a high power drill style motor with gearbox)

[hellsplumber]

Weapons

Im on my PSP at the moment coz my PC cant access the internet.The pic wont load on my PSP so il get on a PC tomorrow and look

By the way,I have saws and drills and sanders.
No welder tho :sad:
I need a cheap one but my ebay account has broke.Me and a freind want to get an electric welder with both of our money.