Thanks, i will find a suitable battery soon. Should i make my base bigger as the Dewalt 24v motor looked quite big in NST, which itself is quite big?
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Thanks, i will find a suitable battery soon. Should i make my base bigger as the Dewalt 24v motor looked quite big in NST, which itself is quite big?
Does anyone know how big the Dewalt 24v Motor is?
echo.............echo.............echo............ .anyone there........
Patience, the majority of regular forum users are probably at the Portsmouth event this weekend so won't have much access to the forum and as such, replies won't be forthcoming quickly. However for reference, both sections of the motor are on the RMP, with dimensions listed:
Motor: http://www.robotmarketplace.com/product ... 10-00.html
Gearbox: http://www.robotmarketplace.com/product ... 74-00.html
Thanks for the reply, i understand what you mean. I have noticed that on gearbox webpage, it said that item had been discontinued. Should i make my own gearboxes or try to order that one even though none are in stock.
Archie, what hardness/durometer are those red wheels? Also, if my robot is 70mm tall then should i use 75mm robochallenge wheels or 100mm ones?
I have absolutley no idea about the hardness so your best asking robochallange.
Im sure you could cut all the rubbber off the wheels and stick some bike tread on them that would make them less than 70mm but its a waste of wheels.
In future you can try just pressing the pm button on who you wants profile.
Private messaging is a much better way of getting the answer quicker.
Just so you know for future
I would go for 100mm wheels or 75mm wheels with bike tread screwed ok around the outside to bring it up to about 82mm
Thanks for the replies, i will use 100mm wheels. Here is a picture of a foam and cardboard prototype for the layout of the machine. The main circle is 25cm in diameter. If you see anythings that need changing, then please tell me before i progress further.http://i1280.photobucket.com/albums/...psb25c4291.jpg
Seems rather small. Also where are the batteries supposed to go?
Thanks Harry, the batteries and electronics all go in the middle square. But it is 80mm tall, so i hope it will all fit in. I will use steel for armour, then a layer of rubber, then a layer of 3mm plexiglass/perspex.http://i1280.photobucket.com/albums/...psc22819b2.png
will sure be impressive and compact if it works.
Sure its not too compact though?
I know you have read my thread about the sizes of featherweights but you might want it 1/2cm bigger in diameter.
because NSTs bar could easily damage those motors whick are soooo close to the sides.
Ok, thanks Archie. I will start programming my beetleweight this week. Here is a link to the controller board that i will use. It is only 20mm in diameter and only costs £5! It will need a programmer but Sparkfun also sell them. I will be ordering the wheels and motors soon, but first want to complete the beetleweight. More pictures of it after i have painted it. Do beetles need removable links or not?
https://www.sparkfun.com/products/11364
botbitz are probably the best cheap controllers available but I have absolutley no idea about programming.
I basically edited everything I said so max dosn't make me sound like an idiot.
happy days and stick with max's advice :lol:
i cant even do smileys right today :rofl:
Your beetle weight motors will only draw a few amps so you should be fine- I think you will need either an H-bridge microchip or some mosfets to control your motors though. Your other option would be to make the microcontroller control a normal esc.
You will also have to reprogram the microcontroller bit it says that is possible. I assume you are able to put inputs on that microcontroller which you will need for reading the signal from the receiver and from your accelerometer.
sorry for this tiny thread hijack but on the note of programing ESC's.
Could I use an arduino microcontroller like this
http://www.hobbytronics.co.uk/arduino-m ... egory_id=0
To control a botbitz speed controller for an axe?
Thanks
Look up arduino as isp, never done it myself but should do what you want.
You don't need an arduino mega, an arduino UNO will do and is much cheaper (£10 at technobots) or you could use an arduino mini.
I am sure you could use it to control the axe with a botbitz, if you are good at programming then you could get some really nice features for your axe like an automatic slow speed return or some sort of rapid fire system.
Thanks for your answers and sorry marvin you can have your thread back now.
I will ask my questions in this thread http://www.fightingrobots.co.uk/foru...=5725&start=30
As promised, here are the pictures of my beetleweight robot. It doesn't have a pizza theme, but i had to use up the black paint i bought for it. Those stickers on the top are not sponsors, they are just showing what i made it with. The weapon bar will not be supported by zip-ties, that is just temporary.http://i1280.photobucket.com/albums/...psb4e5bcf1.jpghttp://i1280.photobucket.com/albums/...ps322052a3.jpghttp://i1280.photobucket.com/albums/...ps2b975dd7.jpg
Should i use gears and chains or pulleys and belts for gearing down the motors?
In other news, this is my antweight, mini pizza. The base is alluminium, the outer ring is a steel cookie cutter, and the motor is from a handheld vacuum cleaner that i could take apart (i think....). So far it weighs 98 grams so the lid will be cardboard. The outer ring is 3 inches in diameter so it should fit in the size limit nicely.http://i1280.photobucket.com/albums/...ps58e823c3.jpghttp://i1280.photobucket.com/albums/...ps6d3434f6.jpg
That is the SMALLEST antweight ive ever seen!
They can be about 5 inches long it just has to fit into a 4 inch cube.
Looks quite cool but good luck getting anything else in there.
Should i use gears and chains or timing belts and pulleys for gearing down my featherweight?
Anyone?..........
everyone has their own preference and each method has it's advantages
what motors, wheel size and voltage are you planning on using? this will dictate a ratio estimate then the best method will be easier to suggest
I am using these 2 of these motors run off 6s lipo's at 22.2vhttp://www.robotmarketplace.com/products/BP389010-00.html
And the wheels will be 98mm diameter banebots blue wheels that are 20mm wide.
Why not just buy the dewalt gearbox that robot marketplace sell to go with that motor, it will be easier and possibly cheaper.
I will not buy that gearbox for 2 reasons:
1. It has been discontinued by Robot Market Place.
2. It is too big for my chassis size
Hello all, time for an update:
Beetleweight: Accelerometer arrived today - 2 weeks to arrive is just pathetic! I ordered it from Sparkfun, and needless to say, i will look elsewhere for an accelerometer in the future.
Featherweight: Made a CAD model of it in Blender 2.63, not too accurate (no measurements), but i am planning to make the chassis 400mm in diameter, to give me much more space- i just felt that 250mm was to tight and there was not much space for components to move about after a hit.
By the way, does anyone know when the earliest you can sign up for the 2014 FW Championships (yes, i know it is very early, but i don't want to miss out)?
Sparkfun is an American company, so unless you ordered from a UK warehouse, two weeks is a pretty good delivery time from the States.
Sign-ups for the UK FW champs tend to be open 2-3 months before the event, so it will depend on when that is. This year, for example, the sign-ups opened mid-January and the event was the first weekend in April.
Ok, thanks for that, it was my first time ordering from America, so i didn't know what to expect. I will try to get the FW build done by Christmas time, and then will have a few weeks to do testing.
Update time!
Sorry it's been a long time, but i've had other stuff going on so not much progress.
Shred:
New tooth fitted, and ready to get programming. Problems with the Arduino have been quite annoying but i think there is a solution.
Mini Pizza
Wheel properly fitted now, sharpenend tooth and hope to order LiPo and Pololu Baby Orangutan 328 soon.
Pizza Cutter
Had a new idea for this featherweight, the design might change a bit, picture below, please comment on what you think.
http://i1280.photobucket.com/albums/...psa6d43df7.png
Anyone???????........
The featherweight design looks pretty cool, and quite unique too which is always nice, good luck building it :)
Hey guys , been looking around for metal for the chassis. Does this inch square box section steel look good enough, or in weight. The design is like the original idea of a 40cm diameter pizza, and will be 2 hoops made out out of box section steel, held together with around 10 3cm uprights. Here is the link: http://m.diy.com/mt/www.diy.com/nav/...n_jtt_redirect
Tell me what you think before it's to late :)
Several remarks.
1) No wall thickness mentioned
2) 2m long ain't industrial standard, it's retail standard
3) Varnished, again retail standard.
This means it's probably a soft mild steel, thin walled (1 maybe 2mm thick if you're lucky, with anything in between).
It will do the job, but any decent spinner will chew it up as if it's candy.
Also, for 2 meter bought at a retailer, I can buy 6 or even 12m unvarnished normal mild steel at a steel-depot.
I would pay head to marios advice. Look in the yellow pages or online for a metal stockist nearby and phone them up direct. When I ordered up some mild steel tubing even though the delivery price was the same as the material cost I ended up with a good 18m of tube for far less than a commercial entity would charge (they came in 6m lengths)
Just saying, i will only need around 2 metres of tubing for this build.
Also, what sort of thickness of wall would you reccomend, bearing in mind i will have steel plate and then polycarbonate on top for armour. It will need to be able to take some high-speed hits as i will attach the teeth to the uprights.
(haha....double post!....)
Just a couple of questions, How do you plan on bending it into a perfect circle? Are you planning to weld the box section together? How are you going to mount these rings onto bearings so it can spin? And finally how do you plan on getting drive to the rings so they spin?
For box section I would find your local metal workers and pop them a visit explain what you are doing and try to buy the steel from them, they could probably cut you off a 2m length.