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https://www.youtube.com/watch?v=P6wUEQIoAlM
I have been busy sorting out the Omni Wheel robot platform for BB8 Project, as you can see the thing seems to be going OK.
it is great fun to drive even with the awful DX5e I have at the moment. enjoy the video. :)
That looks cool... Way cool.
you should build a spinner around that and it would be brutal but i cant wait to see bb6 cruising round the pits
That just seems to defy physics!
Some pictures of the parts used in the omni wheel test chassis, just in case anyone wants to make one. I have had a lot of fun driving this mad bit of kit I would recommend it. setting up the mixer was not difficult either.
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I have chosen this as the main ball 500mm Polyethylene it weighs in at only 2Kg and is round! It has an access hole as it was a garden light fitting. The other picture is my attempt at making a mould for the manufacture of the access cover.
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If I don't use the wheels for BB8 and use something else what to do with the old chassis.
I could see if I could bring new life to this tired rotten old apple.
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Craig, not sure if you've seen this http://toyland.gizmodo.com/an-exhaus...r-w-1709299669
Hi yes I've been following his exploits from the very beginning video on utube with regards to this. he said in the second video it's not how the Disney one works!
He is using an inverted pendulum method I like it, but it isn't how the one used in the film works this is commonly agreed that it uses the "hamster ball" method with omni wheels unfortunately no information about the robot will be released before the film in about 6 months time. So everything is guess work but all the r2 builders agree on this point.
this was discussed on this thread in May I think, interesting project though.
I seem to be collecting the 500mm globes now
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These are the wheels for the MK2 version of the hamster robot, the wheels are 100mm diameter this is quite large but I wanted the load capacity for the ballast weight up to 10Kg!
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I cant see a thread to post about the Guildford event that happened over the weekend, so I'm posting here.
As always a big thanks to John and ALL the team at Robot Wars. the shows seemed to go very well and the audience seemed to enjoy the shows yet again. Had some great fights and looking forward to seeing the videos soon. Great to see some old friends, and so good Zack could join me for this event. there was a good selection of robots for the shows and finding places in fights was quite hard. only one fight per heavy per show. There were a lot of robots there!
Looking forward to Barnsley.
Robots taken were Saint and Gabriel also Seraph and E-Knock, with Kettle and Mc Apple.
Saint worked well and even stayed in the arena well almost (see video when it's out)
Seraph had some intermittent fault that I just could not be bothered to sort out!
E Knock worked well until one gearbox seized possibly blowing a speed controller. More on that one as news breaks!
Kettle bot worked better than it has for ages possibly better than ever, this due to a change in the transmitter used from the spec 5e to the spec 6I.
Mc Apple was good fun and people liked it, not sure whether to keep it or scrap it will decide later.
But for us the star performer had to be Gabriel it is now going like I wanted it too. I would be interested to know how the arena floor held up to the sledge hammer!
with the new speed controllers and motors it has all the power I need. I have a feeling the gearboxes may need some modification latter down the road as the load on them must be horrific. the torque limiters built into the wheels seemed to work as we didn't notice any slipping when driving but the aluminium washers were polished so something moved when it had to.
The new painted Sledge for Gabriel. this time fitted with a tether.
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Under the rules normally, thwack or axle bots don't have to bother with these things as (in this case the hammer) is a part of the main body (because it is bolted directly to the body) of the machine. you don't tether any other panel to the robot do you!
But as Gabriel now swings the 14Lbs sledge head at quite a speed. it is probably just as well.
https://www.youtube.com/watch?v=p-gh8jLBqIc
I was wondering how fast the 14lbs (6.35Kg) sledge hammer is now going on the improved Gabriel. in the video above the fight that starts at about 48.48 shows Gabriel going nuts hitting everything that moves. I calculate a standing hit to be about 0.33 seconds and a dynamic move, (Gabriel moving towards the target before hammer swings to be about 0.25 seconds. dose anyone have means of analysing the video to give some indication of how fast the swing is now.
I have been repairing and improving Pilgrim over several months.
It's taken days of work but I am now on the last leg rebuild
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I will also probably convert it to run on LiFePo4 batteries while I'm at it.
That's awesome, are you an engineer for a living?
Had some problems with Gabriel at Barnsley I have rewired bits of it again and fitted a separate BEC with Isolating switches for that and the two speed controllers.
Also I have changed the links a bit, as they kept jumping out and stopping the robot in the fights.
since the modifications there has been no more problems. fixing different glitches seems never ending on this robot I hope I am coming to to the end of them!
Doing some work on Cherub I'm changing the lifter speed controller to a Bots-bits 85A unit Pictures to follow soon.
No Dave I'm a gasman :)
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A new speed controller on Cherubs lifter, It works so much better I may have it controlled by a separate transmitter for the champs. see you can fit a botzbits 85A speed controller on a heavy.
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I'm looking to fix one of these speed controllers it works in one direction but not in the other, there is no component damage that I can see, so I'm not sure what bit is likely to need replacing. any ideas?
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Are these not the ones with an external relay? Looked on line for a wiring diagram but no joy.
I do have a few already wired up in the shed. From what I recall it's a single direction controller with an external h bridge for direction.
That said it might just be the single direction one which was available too.
It is the bigger 30A 24V speed controller that blew when one of the two drill motors seized a while back.
I think the relays on this one are the 2 black boxes on the left hand side of the board they have something like NAiS ACP131 on them, dose anyone know were I can get these or something to fit.
This stuff is not something I would try but its bust anyway so I may as well have a play.
Definitely sounds like the relays. It's quite possible that the relay contacts might have just welded shut. If you can take the relays off the board, you should be able to take the covers off them and clean the switch contacts with either a small file or a bit of wet and dry paper. If not then you might be able to get hold of some new relays.
http://uk.farnell.com/panasonic-elec...fZ8aAuRo8P8HAQ
I think the component is this one any ideas or comments?
Lipo battery boxes made for 2200mAh 3s I use them in E-Knock.
Custom made aluminium with Tig welded corners.
I asked for 2 but 4 were made if anyone wants 2 of them PM me offers.
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Hmm, possibly interested, pending dimensions if you're able to provide some?
the box fits 2200mah 3s battery with padding support included, external dimensions in mm with lid.
H45
W65
L130
How did you get on with fixing the 30A electronize speed controller? From what you said it sounds like a relay problem to me and so replacement of one or both of the relays should fix it. You used to be able to get an external relay version of that controller which had the relays removed from the board and the relay coil wires brought out. You provided external relays [12 v coil] and wired the relays across the output to form an H bridge. This was much better than the internal relays because:
1. You could provide heavier external relays which were less likely to fail.
2. When they did fail you could easily test them, find the defective one, dump it and plug in a new one.
Haven't been on the thread for a bit sorry
Yes I have changed the relays for new ones, and the people didn't make any difference, not sure why! It could be my soldering or the fact the old relays were a pain to get off but the speed controller worked one direction but not the other as before.
I will take it to the champs and would like any advice on it, I don't need it for the featherweight as i have a spare fitted but I wouldlike to try to fix electronics as I normally steer clear of the "Dark Arts". :)
Well I'll likely be there with a host of electronics tools in an attempt to keep the magic smoke inside my new speed controllers, so I'll give it a look whilst I'm there.
That's very kind thanks Rory
Got this to try to get the colour scheme right, when the time comes.
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A bit of fun with Cherub. :)
https://www.youtube.com/watch?v=D_mVf7dmrog
Bigger wheels for Gabriel because 800mm just isn't big enough! :)
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Some pictures of the work so far on the new E-Knock robot, the wheels are home made and I have no idea how they are going to workout. It is a bit un nerving to be able to see straight through! Made of 10mm Polycarbonate they should be OK the Gimson drive motors are fitted with 18v motors and will be driven by a pair of 6s LiPo batteries wired in Parallel giving a pack size of 4400mAh, with the standard Botzbits 85A speed controllers and that is about it.
More to follow.
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The polycarb hubs could work well. I have been using polycarbonate hubs in Colson wheels for years and they have survived direct spinner hits and have never broken. It really depends on how thick your hubs are.
Does the polycard screw onto the drill shaft or just slide on and held captive by the screw? Any chance of seeing an up close picture as have been after a new wheel solution since the robochallenge stuff dried up.
Hi Dave.
This picture may help,
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The procedures as follows:-
1/ cut disc with 3" cutter.
2/ drill out to 8mm, then tap 3/8" unf
3/ cut bike tyre long enough to go round disc, then cut down the middle.
(the tyre in the picture will do 2 discs)
4/Cut a buttress profile along one edge, (I used the side that was closest to the rim)
5/With 3.5mm*15mm wood screws fix on the tyre, I used a 2mm pilot drill for this bit.
Hope this helps, but I don't know if the wheels will work yet! :)
God that's fantastic thank you !!!!!!
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E-Knock is ready for this weekend for it's first test.
This is fantastic, you have the best collection of robots ever...
I realised I hadn't said anything about the new E-Knock and how it worked out in the arena on it's first event.
Basically it worked perfectly, the new wheel design gave no problems at all in fact I was stood on the robot and very carefully drove it around the arena, this was between shows.
the blade on the front was fine and the motors with the new speed controllers worked with out fault.
the only thing I need to do is increase the voltage on the motors or change them for some 12v ones as it was too slow in the fights, this made it a bit boring to drive
the picture is to show the old E-Knock for scale.
BTW i may be selling the old one in the near future.
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It's been forever since I've put anything up here so some pics of the refurbished Saint to start with and other things to come.
The big thing on this picture apart from all the paint is the long nuts welded on either side of the body end plate. I have found over the years the body got squashed mainly by THOR these are going to have jacking bolts to try to stop this happening any more.
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The body had some welds re-done then just some paint.
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New rubber for the body drum.
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The drive sub assemblies are reassembled and new type chain tensioners fitted.
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Bits put together you can see how the jacking bolts work in this one.
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New battery straps fitted as we wore the old ones out!
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information on the new wheels and top armour to come.