Team Saint Robot Builds

That's it Tron is going LiPo, I have a 35c 3s 2.2 amp pack I have to fit a fuse in the circuit what would people recommend 50A or 70A?

Might be worth getting one of both and testing. I'd expect the 50a to hold fine, the motors would have to be screaming at 12v to be pulling 50a between them, and even if they do the fuse wouldn't blow immediately. The 70a would still be well inside the rules though.

edit: also yep, that baseplate looks like it could do with a spruce up. :P

Seems fine to me ... :p

thanks for all the input guys
I have a question about charging leads I am hoping to use the LiFe 4200 4s 30c Zippy battery, and have a Cellpro10s charger. I am looking for a balance lead to go between the two, I know the 4S battery is a JST-HX type but I don't know the type of plug that goes into the Cellpro 10S!! any ideas?

Everyone seems to be using these batteries so I thought I would give them a go.

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I realised I hadn't put up any pictures of Tron with it completed so here they are.
As you can see the LiPo battery is held in an aluminium box and the Maxi type fuse holder with 50A fuse is clamped down, looking forward to running it at Portsmouth.


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I thought I would start downloading some pictures of the new Saint build.


Firstly the motors used in this project, the old Saint A used the Bosch 750 units but for an axel robot there has never been enough power , so we are using the Mag motor it has three times the power of the Bosches but the penalty for this is extra weight.

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The wheel hubs are always a cause for concern on the larger wheel robot, as the stresses on these parts are always large. We have decided to stick with the trailer hub design as with Saint A they have never failed in combat and with the taper roller type bearings they are best placed to accept the axial loads expected.

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I always like to have the drive as an assembly that can be removed complete from the robot, here are the drive units complete and ready for the next stage of construction. you can see the gearboxes made by Mike the final drive is 1/2 inch chain similar to Saint A

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Then parts on the garage floor trying to work out the width of the robot and how we are going to squeeze all the bits in, the finned aluminium is the passive heat-sink for the Wotty speed controller.

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Hope you found this intresting

Craig
Team Saint

This is really cool. Are the chains expensive and sprockets hard to get hold of etc?

Looking really good. That drivetrain is lovely.

Thanks for the comments.
I am much further through the build than these pictures would indicate but want to keep some chronological order so you guys can see the build progression.
The chain and sprockets came from Technobots the prices they charge always seem reasonable to me. the sprockets needed a lot of machining to get the weight down.
This is always going to be the big problem with this build. the projected dimensions for Saint B are about :-

Height 800mm
Width 1350mm
Length 1800mm

And yet the space to put things in is going to be very tight!