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Diary
 
2003-02-18
 Final preparations for Antweight World Series 10 in Ireland. Pants goes on the back of its good showing at Robot Wars: Extreme and the last WS. No major changes to the robot - no opting for metal armour yet either. Let's see how it hangs together in Wicklow.
 
2002-11-20
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Over the years, Pants has become a firm favorite with competitors, fans and casual observers. I have been selling Pants plans and construction kits through the shop for some two years now and it continues to be the most popular choice. I have built various versions of Pants:

 
2002-11-20
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This is the white Pants I built for one customer. Pants has come in all colours over time. The black Pants here is the original.

 
2002-11-20
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This was the experimental scoop used in a couple of World Series. The scoop is actually very impressive and I did consider not going back to the axe. This variant of Pants runs both ways up. The scope is made of 1.5mm aluminium and can be used as a third wheel.

 
2002-11-20
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The Pants on the left is the familiar one used in Robot Wars: Extreme on TV. It used sticky tyres (using a lint roller cartridge) and the copper strip at the front. The side panels where made of plasticard and covered in extra thick insulating tape. The drive came from 2 SD200 servos.

 
2002-11-20
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The Pants on the left is the newest version. This uses Dycem covered wheels, carbon fibre axe shaft, 300mAh batteries (2/3 N cells I think) and now uses the high-speed modified HS81 servos. Some people have asked why I have gone back to HS81s. Simple - they are very easy to speed modify. The new Pants can outrun everything on the ant circuit at the moment. It has a little less pushing power, but can still push a full can of coke easily. I have also been asked how to do the speed modification. Well, sorry, but I'm not revealing the ins and outs at the moment. Just to say that it still uses the original gears, but not in the same formation.

 
2001-11-30
 

Pants (Panda Monium's Antweight Sister)  is designed to be under 150 grammes and can be used for fights in a table-top arena. There are a number of antweights being developed by other robot builders and Pants was the first antweight robot built by Team Panda Monium.

 
2001-11-30
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The robot uses micro servos as drive motors - they are modified for constant rotation. The modification is fairly straightforward. I use HiTec HS80 or HS81 servos which produce about 2.6kg-cm of torque at 6.0v. Modification is simply a case of removing the case, gently lifting out the top gear. This is then drilled through and the notches in the top of the case are ground out to allow 360deg rotation. The only remaining trick is to glue the feedback pot so that you get a neutral point in the centre of your control stick. Once this is done, you're in business! (see the Radio Control part of Engineering

 
2001-11-30
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This is a close-up of the original Pants internal workings. Unfortunately they are obscured by tape - I used the wrong glue at first and in the sun it gave way. The wheels are mounted directly from the servos and are for model aircraft. The ariel is tucked away between the two drive servos. Next to the port servo is the receiver. This is a standard 4 channel 40Mhz receiver. Next to the starboard servo is the battery- a nickel metal hydride single cell. 4.8v, 110mAh. It just plugs on to the servo. I can recharge it with my standard receiver charger. Finally we have the lifting servo and arm. This is positioned to give maximum force to Pants self-righting weapon.The body is made from nylon sheet and is stiff enough to work without any additional structure.

 
2001-11-30
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These two shots show Pants using the arm as a weapon - move Pants under other robot and push it over with the arm!! Likewise, the arm can be used to block incoming attacks.

To see some animation of Pants self righting, click here!