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Spur II build
Well this was Spur. It was my first featherweight and in general happy with it
http://i1184.photobucket.com/albums/...t/SDC11537.jpg
Good points
- Chassis was solid. It used 10mm HDPE but the corners were joined with angle iron and had a 3mm base. You didn't want to drop it on your toe!
- Traction. It used 4 drill motors with 100mm blue wheels with mountain bike tyre. The tyre had a nice open tread and wear rate was low
- Its a lifter and the linear actuator was very powerful
Bad points
- The wheels were exposed so vulnerable. It got slipped once landing on a wheel wrecking the gearbox
- Linear actuators have no give. So landing on the forks meant the forces had to go somewhere. Generally into bending the forks
So after getting my axe robot into a working state, and learning a bunch from steel chassis bots, I have decided to build a new Spur imaginatively called Spur II
I wanted to keep the bot nice and small. This allows me to use weight in a more flexible manner.
Key objectives
- good traction
- protected wheels
- strong lift but able to withstand shocks i.e. flips
- able to go full combat
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Re: Spur II build
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Re: Spur II build
So this is the basic layout
http://i1184.photobucket.com/albums/...ps95ac4302.jpg
Its tight inside but enough space for the important bits
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Re: Spur II build
I've got the steel templates cutout
Currently 4mm Hardox sides. The chassis plate is 3mm but looking to move to 4mm as well
http://i1184.photobucket.com/albums/...ps319423fd.jpg
Just need to buy a welder to put it together :D
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Re: Spur II build
The lift motor is from an AEG 18V cordless drill I picked up cheap from ebay
Its a monster but the gearbox is 2 speed and general quality seems very good
I'm building this on a self contained frame for maintenance. It will chain drive the front end lifter mechanism
http://i1184.photobucket.com/albums/...ps6fdb77f8.jpg
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Re: Spur II build
have you left enough space for the esc's
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Re: Spur II build
Yep - 3 TZ85a. They line up nicely under the battery
I might move one under the lifter motor. Enough wiggle room to decide in a bit
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Re: Spur II build
How is the AEG 18V getting its power to the forks? There seems to be very little space
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Re: Spur II build
Chain and sprocket
A 14 tooth sprocket on the motor (welding onto the shaft)
The lifter will be a 17mm shaft running in needle bearings with sprocket welded on there again
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Re: Spur II build
So will the chain go around one of the Gimson drive motors?
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Re: Spur II build
Yes, might need to get some guides in place but the larger sprocket on the lifter helps and the rotation of the chain is minimal
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Well done some welding. Internal bracing is in. This is the basic layout. Can squeeze 4 GR02's , 1 huge lifter motor and gearbox plus a decent sized battery. Will have 3 hacked TZ85a's.
The control for the lifter is going to be electronic through a Arduino Nano. I've been developing the code for axe control and decided that a few small mods it can be used for a lifter including torque control. This allows me to remove the need, and weight, for a mechanical torque lifter. Shame I decided this after I bought the mechanical control
http://i1184.photobucket.com/albums/...pse34e8adc.jpg
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So that's what that shaft was for. I did wonder why you only needed one.
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So its been a while since I updated the thread. Moving house got in the way a bit
Anyway it lives :)
Its drives now looking to tidy everything up and getting the lifter fitted, hopefully over Christmas as I have some time off from work
http://i1184.photobucket.com/albums/...s6317e31d.jpeg
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Looks great, possibly worth putting something on the side so it can't land there... and as Ellis found with tormenta... If you want to fight spinners your better of with a Hardox wedge then spikes... Similar to sewer snake.
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Agree. Its a hardox chassis and I have some hardox left. Also considering HDPE as a thick side strip which will have some "give" for impact
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That thing is built like a bunker! It bares many similarities to Tormanta 2, right down to the forks on the front and that did very well. I think I am going to enjoy watching this Thing smash its way around the arena.
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I don't know how the hell you have enough weight to have made this design entirely out of steel like that! It does look a fair bit more compact than Tormenta 2, which from rear to tip of the forks was over 60cm long. When we revisit this shape we'll be losing the forks, as Mouldy says, they're great for getting under other machines but are about as bad as it gets for spinner fodder. They are just cool though, right? :)
Looks like you are using thicker box section than we did, but even when we had a 3.5mm steel plate on the front, Inertia XL alone did this in two fights: https://fbcdn-sphotos-a-a.akamaihd.n...08030480_n.jpg
It looks really nicely built. Wouldn't mind some closer shots to see some more detail. Hopefully either T2 or some future-T3 gets to tussle with it!
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What are it's dimensions, looks very compact.
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Its roughly 290mm x 350mm x 90mm and at max weight for a feather
Not much spare volume inside
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Wow, that's really small for a FW. My new FW is gonna be 220 by 280mm approximately.
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do the tz85a's handle 2 motors well? im literally about to buy some myself for my new 4wd machine!
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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.
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@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.
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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.
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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
http://i1184.photobucket.com/albums/...psd536b5b2.jpg
http://i1184.photobucket.com/albums/...ps02ff597f.jpg
Some work to do mounting things in the case and some weld grinding but should make it for Sunday
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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...
http://i1184.photobucket.com/albums/...ps07dd50b2.jpg
I reverse the right to change without notice :)
