I think we can agree that brushless up to the featherweight class is basically "confirmed" now! Looks good. :)
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I think we can agree that brushless up to the featherweight class is basically "confirmed" now! Looks good. :)
Need to weigh again, I'm going to use it allQuote:
Originally Posted by Rapidrory
Have to build up the battery compartment and decide on the lid material (hardox or Ti)
Plan to have side HDPE panels bolted on and add some additional thickness to the front buttress
Like the thought of magnets and played with those before but need to get the strength right
Here's a useful tool for getting magnets right; I used it for Incomplete Control and it's pretty spot on.. https://www.kjmagnetics.com/calculator.asp
Seeing all these robots now with hardox, would a swarm of microbots with magnets work?
See I was thinking this the other day. What if you entered like five or six featherweights as a heavyweight, and just slipped underneath the opponent and pushed them into the pit?Quote:
Originally Posted by adamclark
Imagine a feather being flipped by a modern flipper....
"that one came down with ice on it!"
You mean like Behemoth in Episode 1 of the new series? Or did you mean full pressure specifically?Quote:
Originally Posted by maddox10
Modern flippers, like Eruption , Kronic, Iron Awe and the daddy of those, Gravity.
Off to Stevenage with Spur 3 for its first outing. More of a test run as weapon is not finished. Also made a mess of my plastics order hence the clear lid (not for posing honest)
http://i1184.photobucket.com/albums/...sfoekjp9d.jpeg
Looks fantastic! Can't wait to see this ramming into stuff!
Well an interesting Stevenage
Spur 3 had plenty of push and was fast
Need the front scoop to help throw some robots about
At the end of session 1 a tyre came off - not enough screws and need to be pan head
Fixed that
Setup for session2 and had dramatic smoke coming from the bot. Crew did a great job of grabbing the robot and racing outside
After a blast of CO2 worked out it was not lipo but a TZ85a. Once stripped down I could see that one of the motor bolts had come loose jamming the gear and stalling the motor. TZ85a vs NTM 5060. Time for a HK order
Happy with the day though. Robot shows alot of promise and can focus on fixing various things
Alex drove Spur 2 and that had a good day after working on strengthening the drive line. It did shed a tyre. Looking at them the rubber is getting end of life. Therefore it starts Sunday with new tyres
Nuts had a great Saturday , Rory can write that up
Been a while since I posted on this
Put a front scoop on Spur 3 and locktite in all the important places. Should be ready to roll :)
Started collecting the parts for Heavyweight drive gearbox. Since I was in the US I picked up some Neumotor 8019-150KV
Its 1.2 Kg of motor goodness
These are chunky and much more substantial than the Rotomax I was looking at. Once I have finalised the gearbox design I will be off to the local engineering shop for some milling
http://i1184.photobucket.com/albums/...psmvxm58pv.jpg
those are very nice!
Those motors leave the Rotomax range for dead! Any thoughts on the ESC you will use with them?
Many thoughts , havent decided yet. I seem to have started a whole debate in the combat robotics section on FB :)
There are the castle mamba xlx and also a China https://l.facebook.com/l.php?u=https...98&h=UAQEuvwCH
So I see - I am using A Kontronk Kosmik 200 with my 8019 - its powering a weapon so I don't need reverse. The MGM controllers are well made and the tech support is super helpful; they offered to do custom code for me. VESCs are probably borderline for power handling and the guys over here are not sure how they will handle high pole count motors.
Had a look at the MGM's, they are nice but pricey [increasingly so with the pound dropping!]. The Castle is looking more of a possibility. Rory was interested in fettling the Aliexpress. For now I will design space that will take either, have enough stuff going on to keep me busy
Thinking about wheels, its been going round and round in my head
I made wheels for Spur 3 from Nylon and its was a pain, modified Banebots for Spur 2 and blue tyred jobs for Spur
Having seen castor wheels fail spectacularly at robot wars I didnt want to go this way for my heavy. Spent a ton of time trawling round looking for pre-made wheels I found these at TEP Technica Ltd https://www.technicawheels.co.uk/
They are worth a look
Even better they were about 20 minutes drive away
http://i1184.photobucket.com/albums/...psgbqddnaa.jpg
Onto the next bits
Well, I sat these 2 side by side and the size difference popped out (not surprising)
On the left is a bearing support and pinion for a P60 Banebots gearbox. On the right is a BB220 gearbox an pinion
Both will be doing the same job but in a feather and heavy. Just hope I dont mix them up
http://i1184.photobucket.com/albums/...psp3kuktys.jpg
What motor are you planning to use with the BB220? I found that the rear plate on the older P80 gearbox was hard to use for anything other than the CIM motor and ended up making my own replacement.
Since I don't have enough pain, misery and frustration in my life I am going large brushless outrunner
Start-up torque will be interesting - my usual approach is go big and low KV on the motor then sensorless
Be fun finding an ESC that doesnt turn into a toaster and dont get me started on VESC.
Did i say I don't have enough pain, misery and frustration in my life
Got my custom Neumotor shafts back along with my broached gears. I can now do a final measurement check and put the order in for waterjetting
This will allow me to put the 2 drive pods together
No banana's were harmed in the making of the new shaft
http://i1184.photobucket.com/albums/...psreqbehj0.jpg
The work was done by D.C.V. Precision Engineering at Aldershot
Andy the MD is a bit of a RW fan :) Never a bad thing when you are asking for small batches / one offs
Is this robot going to be the new Tornado/Storm 2? Those look absolutely vicious for drive motors.
I love the idea of interchangeable weapons. The Battlebots teams seem to put alot of effort in that area
You then have to think about the drive system being more a weapons delivery platform :) which is a bit of a challenge as a really like small compact robots
My first objective is to get the drive pods completed and then do some basic driveline testing. The choice of ESC is quite limited as I dont want to spend MGM money but then smoking a few Flier's you could of bought them. I am hedging my bets and allowing Ampflow A28-400 to fit if needed but I want to persevere with brushless. I got there in the end with feathers with alot of iterations and have a quad 5060 feather in the works (yes , stupidly overpowered but who says spending days building something with the expectation it will get smashed up is rational)
Nice! I'm quietly trying to make the move over to brushless too. Bought some for my next featherweight and I'm looking into heavyweight weapon drives - if Ellis with Pulsar, and the Big Nipper team can get them working well, then hopefully so can I.
I do like the Battlebots style, it feels like a fresh approach with a lot of diversity. Admittedly a lot of BB teams have much more funding than us, but I definitely feel there's a place in Robot Wars for lighter-armoured, fast aggressive machines, as we've seen recently to some extent. All the best with your brushless endeavours!
That custom shaft looks excellent! If you are planning to run the motor at its full 53V rating, you need a 300A ESC to cope with the motor's 15KW peak rating and there are very few choices. I have no idea if its possible, but simon K firmware on the Hobbyking Fatboy2 ESC would be a cheapish option.
It gets tricky for sure. I want to run at 10S which narrows the choice even more. There are a number of 8S controllers around e.g. Big Nipper team run ToroRC Beast with custom software. The Flier ESC's due higher voltage but are the typical generic Chinese ESC. Some heavies have used them e.g. Sabretooth. If Brushless Rage was built that would be nice :)
Fliers should be SimonK compatible. Just need the right flavour of code. Go for the 400a ones at least - they have the same fets as what even hobbyking calls a 250a (dlux) esc.
First set of waterjet parts arrived
These are for the drive pods
http://i1184.photobucket.com/albums/...psrypldy02.jpg
I had the sprockets waterjet as well. You can get the number of teeth I wanted but they still need machining therefore I felt as easy to get them waterjet cut. K-cut only has toolsteel in 1/4 thick (its 1/2 chain). They wont wear out. I did forget to add some lightening holes. Since its toolsteel I'm not going to manually drill
Here is one of the sprockets mounted on the wheel
http://i1184.photobucket.com/albums/...psh1zilusq.jpg
Finally welded up the drive pods. I can now start seeing what it looks like
http://i1184.photobucket.com/albums/...psacmhaqcu.jpg
Next step will be a basic baseplate to do some drive tests
Ace looking bits you have there, would be interesting to see it combined with its baseplate to get a sense of how it looks in full!
I tried to shop online with k-cut, but the "buy online" button doesnt do anything for me. Shame, I believe they could help me greatly in my ventures!
thanks
Just email john@kcut.co.uk
well I got fed up of breaking the drive belts on Spur 3
Its an annoying habit but I have a solution
Its also a tyre shredder
Meet the layout of Spur 4
http://i1184.photobucket.com/albums/...ps0mmkfdso.jpg
and before anyone says it there is more brushless than any featherweight deserves
What reduction are you running for the drive? Doesn't look like it'll be enough for the size of wheels. Those are some huge out runners though for the weight, so yea, maybe you'll be fine.
Its not lots of reduction 5:1 , Spur 3 ran 5.5 : 1 on 2 motors
Its fine. The motors are low KV but so much torque for a feather that cogging is not a concern
I've ran smaller motors on similar reduction (Olaf) which was great
Many things have got in the way of getting the bot this far
Finally took it for a test drive tonight.
Not quite finished yet. On temporary wheels and tyres which are rock hard. Strange though, they do wear quickly ;)
It will need magnets in the arena thats for sure. Comes in at 11.6 Kg. Weight left for scope, side panels, lid and a few electrons for the battery
Have a lifter assembly if I can squeeze the weight to replace the scoop
http://i1184.photobucket.com/albums/...pszm2bnwp4.jpg
and test video
https://youtu.be/3-aoZHdf0Yg
Its been a while
Ran Spur 4 at a live event with the temporary wheels , they were awful
It also broke a pinion weld and went down to 3 wheel drive :(
Rewelded the pinion
Replaced the wheels with contact wheels - strangely 100mm wheels are quite expensive and took time for them to come from China
When they did one didnt match, so had to re-order to get 4 matching
Finally got a full set
https://i.imgur.com/GsMR5vH.jpg
The other thing I have been working on is a heavyweight Spur 4
Made up 4 drive pods using contact wheels, 6368 motors
They use HTD5 belt and mod 2 gearing. This allows me to get the packaging I wanted
https://i.imgur.com/TMnQLcH.jpg
https://i.imgur.com/mlWUtDZ.jpg
Did a test of one fully assembled. Seems fine and no real load. The TZ85 survived (I will be using focbox ESC in the bot]
https://youtu.be/IvXqGNshU6c
Racerstar 6368 motors ?
have you fitted sensors?