Team Saint Robot Builds

[Mega Masher]

Wet noodle wire from robot marketplace????

[craig_colliass]

Thanks for the advice guys most of the bits now ordered.

[craig_colliass]

When connecting wires to the EC5 and the XT60 connectors, what procedure do people normally use as I have been having some problems with these fiddly little connectors!!

thanks
Craig

[Mouldy]

Only used EC5- this is my method;

Strip and tin the wire, make sure it still fits in the connector... Heat and tin the inside of the connector, push the wire in while maintaining the heat and add solder as required...

The most important thing is to make sure the outside of the brass contact is clean, if there's a blob of solder on it, it'll never go in the whole... Then get a small screwdriver push the connector on it and lean on it- takes a fair bit of force to get it to click into position but once it's in, it's not coming out.

[craig_colliass]

After several years I have decided to change the polycarbonate chassis on Tron

As you can see not before time!!


IMG_0397.jpg

[craig_colliass]

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?

[Ellis]

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

[PJ-27]

Seems fine to me ...

[craig_colliass]

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?

[craig_colliass]

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

IMG_0401.jpg

IMG_0400.jpg

[craig_colliass]

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.


IMG_0417.jpg

IMG_0418.jpg

[craig_colliass]

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.

2013-10-19 09.47.57.jpg


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.

2013-10-19 09.49.00.jpg


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

2013-10-22 13.24.27.jpg


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.

2013-11-15 10.53.36-1.jpg

Hope you found this intresting

Craig
Team Saint

[daveimi]

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

[Ellis]

Looking really good. That drivetrain is lovely.

[craig_colliass]

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!