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Because of problems with the original drive system I have decided to completely re-model the robot.
I thought this might be interesting to some people thinking of making a different type of featherweight robot.
Just to remind you how the old robot looks here is a link to the pictures. :D
http://s569.photobucket.com/albums/ss13 ... GA4933.jpg
Thanks for watching.
A picture of the new motors that I hope to use.
The main problem is they are twice the weight of the old motors seraphim was under weight (when I took off the armour on the front) but not 2Kg!! So I will have to re-design the whole thing to get the weight to 13.6Kg
http://s569.photobucket.com/albums/ss13 ... GA5149.jpg
Hey craig, did those motors and gearbox's i saw in eds garage not do the trick? Those new ones are massive!
No :cry:
Ed did a brilliant job (thanks again Ed) but it was a case of fixing one weakness and then something else breaking so I decided to call it a day and re think the design.
What I really need is a 100-150w motor with an epicyclic gearbox with an output shaft about 12mm diameter and speed of about 120-150rpm
Please let me know if you find some :uhoh: :uhoh:
A picture of the new drive motor for Seraphim I have fitted a drive spindle into the original annular gearbox shaft, with a section of 17mm diameter to fit the original Seraphim hubs for the wheels.
http://i569.photobucket.com/albums/ss13 ... 1253960891
The new chassis of Seraphim
http://i569.photobucket.com/albums/ss13 ... 1255381634
A long way to go I was not going to start this till January but TV is so bad :uhoh:
I love your robots Craig, they really do add a needed level of variety to proceedings
How kind, thank you :D
Now all I have to do is make them competitive :uhoh:
Pah! Who builds robots to be competitive? Not I. :proud:
I'm not supposed to be doing anything on Seraphim but the TV is so bad at the moment, I find I am in the garage doing bits and pieces on it and it seems to be going ok :D
Here are some pictures of the project so far, the front is the forked end, and the sword will be attached to the pointed end, the big problem with this robot is getting the weight down to 13.6Kg, each motor wheel and hubcap are 4.2kg? I think the first attempt will be a little over weight. :uhoh: :uhoh:
http://i569.photobucket.com/albums/ss13 ... 1257103080
http://i569.photobucket.com/albums/ss13 ... 1257103229
http://i569.photobucket.com/albums/ss13 ... 1257103287
With the body nearly complete the first mock-up with a wheel motor assembly and the sword propped up in position.
http://i569.photobucket.com/albums/ss13 ... 1257325806
Starting to fix the motors in and fit the sword. Here is a picture of Sreaphim as is now :D
http://i569.photobucket.com/albums/ss13 ... 1257513603
I did some sums, and Seraphim will be as fast as Saint across the arena and swing the sword a little faster than Saint, so it might even scratch some paint off your robot this time :mrgreen:
how high is the body off the floor Craig?
Craig,
I don't know exactly as the wheels are off at the moment so I can't measure the distance. But at least 120mm probably a lot more, the bottom is designed to be slanting upwards so the very front is about 200mm from the ground the distance between the wheels is about 560mm. the only time any of the body of the robot gets close to the ground is when it is flipping over to hit something (usually the floor!!) then the motor ends are about 20mm off the floor but only for a split second.
The whole design dose not need much armour as not much can reach that high so it will be a very open design. I don't know if it will work but it will be different. :mrgreen: :mrgreen: :mrgreen:
Hi Craig
I have just measured the height and with the body horizontal the gap is 140mm You can see the gap quite well when Tron is placed underneath the wheels for scale Tron has 75mm blue wheels fitted. When the sword drags along the ground the front lifts to give a maximum clearance of 240mm. the robot should climb over most other robots in the Featherweight circuit at the moment. :mrgreen: :mrgreen:
I hope soon we will see more adventurous designs from other roboteers on the future. :uhoh: :uhoh:
http://i569.photobucket.com/albums/ss13 ... 1257706413
http://i569.photobucket.com/albums/ss13 ... 1257706461
http://i569.photobucket.com/albums/ss13 ... 1257706493
i'll make saintly catchers then
Ok Craig
Lets see your designs for the Saint Catcher :crazy: :crazy: :uhoh:
Let€™s make some wacky designs for this weight class. How about some walkers or a hovercraft with an axe!!! :mrgreen: :mrgreen: :mrgreen:
Post all designs here :D
I could come up with some if you really would like to see ...
How wide is Seraphim? I'm sure Carcinus's claws could grab onto your wheels and make a saintly Seraphim catcher :D
Just need to actually make the claws strong enough to cope in the arena XD
Answer 600mm
the track on Seraphim(13.6Kg :uhoh: :uhoh:) is 10mm wider than Saint (96Kg)
So I don't think so but you can always try!! :mrgreen: :mrgreen:
Come on lets see those designs to stop the MIGHTY SERAPHIM
Nah that's cool, Carcinus' claw capacity at its most open is 700mm-800mm 8)
Really I am surprised how high off the floor do they grip? You can hold my wheels while I thrash you with the sword!! :proud: :proud: :proud:
To be truthful, they're not very high off the floor, maybe about 60mm? I'd be aiming to grab through the holes between the spokes :)
However, as you've said, if I grab your wheels you're free to whack away with your sword!
In truth the wheels are very floppy so as soon as you grab them they will tend to spring free, if you could get the arms through the spokes then you would line your robot up perfectly for a quick lesson in sword fighting :mrgreen: :mrgreen: :mrgreen:
Hehe, indeed! Either way it would be an entertaining battle, and can hopefully take place in an arena soon :)
dont the wheels need to move for the sword to come over?
my crusher might cave a good go, its VERY VERY VERY long and has a razer style beak with behemoth like plow, so i can get under you and clamp and pit :)
failing thati could just oota you with the new flipper bot, or hack you to bits with prodigys axe :P
If the wheels are held in place (say, by the claws) then if the motors try to turn the wheels there will be no driving movement. Using a 'path of least resistance'....err...thingy, since the motors can't turn the wheels, the next easiest thing to move is the body, so it will swing over when the motors are powered up.
EDIT: Analogy is the word I think I'm looking for.....'path of least resistance' analogy
With the Old Seraphim (that ran at Swindon) I had all the flippers try to do something but most could hardly get that height the ones that did reach the underside of the Seraphim just about knocked it up on one wheel for about 1 second then Seraphim just drove over it!!!
The pushers are all too low and Seraphim drove over them too. The only robot that would have any effect on Seraphim other than spinners would be Little Hitter. But I am happy to exchange blows with that one anyday.
Here is a video of the old Seraphim the new one is over twice the power!!! and speed!!!!!!! :mrgreen:
http://www.youtube.com/watch?v=AKn5GY2fdto
Just fitted the new Wotty to Seraphim it is quite quick about 10 mph the battery pack needed some repair then off down the grass out side my house.
Every time I operated the sword the robot got stuck in the ground. :uhoh: :uhoh: This will be a lot of fun to drive. Hope to get some videos up and going soon. :mrgreen: :mrgreen:
Wow, that is nippy 8)
I may have to reconsider my earlier comment about Carcinus' claws being wide enough to be able to grab the wheels. That will only be possible if I'm able to catch the damn thing first! :lol:
tis very nippy :shock: might need to give the feathers bigger wheels :D
That could actually do some damage to some feathers !! Especially with soemthing pointy stickingout the side of its arm so it would be like a hybrid thwack bot.
Yes this time damage is possible :uhoh: :uhoh:
The sword is made from an old car spring, so the steel is quite hard (and sharp), the motors rotate at 140 rpm at 12v I'm running them at 14.4v if the robot is going fast forward, and is slammed into reverse the swing time for the sword is about 0.1 seconds or 100 milliseconds! :shock:
When testing the robot outside on the grass the sword travels so far into the ground it pins it to the spot. :mrgreen: :mrgreen: :mrgreen:
I'm lookin forward to next week :shock:
A video of the Seraphim in action. the end of the video is a bit bad i let Zack record that bit?? :uhoh: :uhoh:
http://www.youtube.com/watch?v=u1AKRBksfMA
Doing some work on Seraphim today trying to get the weight down, also trying to sort out the housing for the Speed controller and battery so they take a lot less shock when the sword hits. This caused intermittent failure of the drive last time and I want to get the reliability as high as possible for this year.
To do this I am making the top a bottom panels out of 6mm instead of 10mm plastic this should save about 800grams, also I have taken a little from the side panels this should save another 100grams. The main single weight in this robot are the motors these weigh 1500 grams each and the gearboxes are 500 grams each. With the wheels hubcaps and drive shaft assemblies this amounts to 4Kg each so over half the weight is in the drives alone. This leaves only 5,600 grams for the weapon, speed controller, batteries, wiring, link and the robot body! :uhoh: :uhoh: :uhoh:
The Seraphim is comming along quite well I have a few things to do like relocate the link but it should be ready for Barnsley :proud:
http://s569.photobucket.com/albums/ss13 ... GA5231.jpg
Got Seraphim going today and it worked ok, sometimes when I used the sword to hit the drive! The robot will cut out for about 3 seconds and then start again I was wondering if anyone had any ideas as to why?
My idea is, for a moment the power is lost and the RX has to re-connect the signal what do you think? :idea: :idea: