Spur II build

[Mega Masher]

What are it's dimensions, looks very compact.

[shakesc]

Its roughly 290mm x 350mm x 90mm and at max weight for a feather
Not much spare volume inside

[Mega Masher]

Wow, that's really small for a FW. My new FW is gonna be 220 by 280mm approximately.

[Walmsley2012]

do the tz85a's handle 2 motors well? im literally about to buy some myself for my new 4wd machine!

[Max]

Just an idea- I guess you could easily make up a drum or egg beater to go in the same space as the lifter forks, if you just changed the gear ratio with the cogs to make it 1:1 or maybe an increase like 1:2 then put that big drill motor into high gear and it could be a quite effective spinning weapon.
This could give you another option for use at robochallenge events if you wanted something other than a lifter, you could easily switch between weapons between fights.

[Ellis]

@Walmsley: Yes. We've had multiple stalled (and plenty of completely fried) motors whilst running tz85s, and they don't appear to even get warm.

[shakesc]

The DeWalt is a 3 speed gearbox.
The design allows for different weapon systems if I want.

The tz85a handle a couple of Gimsons no problem.

[shakesc]

Well had great fun at Yeovil with Spur 2.
Managed to burn out a couple of Gimson motors and therefore have no spares. So I thought I ordered some more, unfortunately the order didn't go through so no bot for Burgess Hill. Time for a quick build

1 sheet 3.2mm Hardox
2 Speed 900 drives
2 Hacked TZ85a
1 Battery
Pack of cutting discs

Leads to





Some work to do mounting things in the case and some weld grinding but should make it for Sunday

[daveimi]

This is awesome

[shakesc]

Well quite a bit has happened to this robot

It was quite a tight packaging exercise but I squeezed in a linear actuator and a lifter. The lifter though did not have a front fork so was only good for self righting. It was also pretty slow.
It competed once in this configuration. It was fun but touch the throttle and it wheelied like mad. The battery was also too small in capacity and after a 3 minute melee almost exhausted - not good especially when everything had to be disconnected to get the battery out.

The packaging was such a pain that I put a power bulge on the front to aid maintenance. It didn't really cut it so I went off for a much bigger rethink.
So the front end came off completely. I put on a lengthened front. Made the battery box bigger. Changed the linear actuator for a DeWut and remade the lifter.
Electronics packaging is still bugging me but good enough for now. Its at the feather weight limit though some work on the forks should allow me to put the sacrificial HDPE on the front (that's what the holes on the front are for). Oh, and had a slight panic today when I found out I had run of sheet HDPE. So off round the shops for a chopping board. Its much harder to find non-trendy (read as good chunks of plastic) chopping boards than I thought it would be. Tracked something down from Wilkinsons but not exactly what I want but its a lid
So this is what it looks like for now...




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