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Build
Diary 2000
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Here
is a rough version of the layout of Big PAnts. If you want to see
the original PAnts antweight robot, click on the back button and go
to the Antweight section. From left to right, the axe arm is driven
by the large central ram. The ram is driven by CO2 from the fire extinguishers:
the little ones being used as buffer tanks. Just behind that is the
new speed controller system. The drive system is more or less lifted
straight from MPM and is two C5 motors driving a 45:1 ratio downshift
to the go-kart wheels. The frame is all being pre-drilled and the
drive system has been made lighter to allow for the weight of the
weapon. Control will now come from a 6 channel PCM controller. |
The
building principle behind Big PAnts is simple enough - the weapon
is everything! The weapon has three functions: axe, self-righting,
flipping of opposition. To be able to provide this ability, it needs
to be both strong and powerful, so if other areas have to be skimped
to make way for the extra weight, sobeit. In this picture you can
see the axe mechanism in construction. The design is similar to that
used in several axes - including Shunts for series III. I'm trying
to build in interchangable axes so that different cutting heads can
be used for different materials. The ram can produce about 1000N of
force at 10 bar...but who said we were sticking to 10bar:-) The biggest
problem is flowrate - this requires a huge switchvalve to be good
enough. |
The
first picture of the layout proper. This is the bottom subframe welded
and drilled with the drivegear all mounted ready to go. The position
of the fire ex, speed cons, buffer tanks, etc is not fixed at this
point in time. Much lighter than More Panda Monium was at this point
though. |
The
top subframe also now welded into place. The angles were tricky to
get right...even moreso when I realised that I couldn't actually get
the robot in the car!! Note the test axehead that I made with some
guidance from Arfa Chilcott (Mortis) - thanks Arfa!! The axe at this
time have been through steel plate, polyprop (from Panda Monium) and
ally. Nice! |
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This
is just an arty shot of the axe really...just wanted to try something
different. The length of the axe has changed quite a bit and so has
the shape and material...not much really:-) |
The
sidepods have proved to be difficult the next two pictures were used
to try and work out the correct shaping for them. They were going
to be made of ally like the top, front and back, but I decided on
polycarb in the end as it was lighter and easier to shape. You can
see below the use of cardboard to check the dimensions before cutting.
Sometimes the simplest ideas really are good and cardboard (like wood)
is hugely underrated for this kind of task. The whole of Panda Monium
and much of Big PAnts have been modelled in card. |
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The
card has just been tapped in place to check fittings and dimensions.
Quick and easy prototyping! |