Carlijns Pizza Box is an old, but know Dutch feather.
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Carlijns Pizza Box is an old, but know Dutch feather.
Thanks for the replies but i will not be entering the dutch robot games, so to me it is irrelevant that there are dutch robots with a similar/same name to my robot.
Pity, as it doesn't matter that much what name the robot carries to participate in the Dutch/Belgian/German events, you would been welcome.Quote:
Originally Posted by Mega Masher
I was just refering to the fact you're not that original with names.
And Dutch robots do participate in UK events.
how about the burger king?
if it was shaped like a burger.
Hello all, over the weekend i started on the 'un-named antweight melty brain spinner' mentioned on my profile. It doesn't spin very fast and is not radio controlled. I will add a Polulu Baby Orangutan and Saturn 9gram receiver, as my transmitter is a 5-channel saturn one so that is the only receiver that it will bind with (i think). Could anyone suggest a way of putting pictures on a post, as the 'attach file' doesn't work.
Create an account at photobucket, upload photos there, copy the direct link. Them here in the forum, while making a post press the Img buttom. Place the link between [Img*] and [Img/*] (ignore the * just so the code doesn't dissapear) and you are all done.
Thanks for that, i will create an account soon. How is your robot going?
It's going well, last electronic parts ordered.
But it's not a competitive one, just to occupy my time, learn and mess around. :lol:
Looking forward to see the next stages of your build, melty brain robots really melt my brain, pretty hi-tech stuff.
Thanks for that, it looks really good. I have sort of completed my antweight spinner, but i will make a new one as i was only using it for testing the 1 or 2 wheel argument so i don't have to test it on a featherweight. In other news, my beetleweight is very nearly done (i will be ordering the 10mm wide, 60mm tall Banebots wheels soon if all goes to plan), and i just need wheels, +/-250g sparkfun accerlerometer, and need to program it. The motors are controlled by an Arduino Uno and Arduino Motor Shield and i will program them in a variation of C. It uses the 9.6v NiMH rechargeable batteries from an old toy. They came with a charger, so it made sense to use them rather than spend a lot of cash on some new Lipos.
Shock mount that arduino really good, it doesn't like aggression.
Thanks, but will probrably use it as a test programming base for my featherweight robot, Pizza Cutter. Pizza Cutter will have 2 wheels as i want it to be stable at 1,000 RPM. I will make the sides, top and base from Hardox and fill the middle section with foam, and cut out gaps to fit motors and batteries etc...
This might not work, but if it does, then you will see a picture of mini pizza, my rhttp://i1280.photobucket.com/albums/...ps844c33b4.jpgobot.
Ok, that worked. Now hereare some pictures of my robot mini pizza in it's current state. Below that is another ant called pulverizer ant (don't worry, it will be renamed). Below that is a photoshop of mauler 5150 with a modification.[imghttp://i1280.photobucket.com/albums/a492/Robot_pizza/20130309_153826_zps31a3b1b1.jpg][/img]http://i1280.photobucket.com/albums/...psd035045c.jpghttp://i1280.photobucket.com/albums/...ps31a3b1b1.jpghttp://i1280.photobucket.com/albums/...psc6e0ab36.jpghttp://i1280.photobucket.com/albums/...psfba93b3b.jpghttp://i1280.photobucket.com/albums/...psea47395d.png
do you have anymore pictures of your beetleweight? or any videos of it in action. cheers :)
Sorry Harry, no videos as the wheels haven't arrived and i haven't yet ordered the accelerometer. In case you are interested, it is called the Sparkfun ADXL193, and it is a single axis accelerometer and can measure up to + or - 250g. Here are some pictures, but i will also need to paint it sometime. http://i1280.photobucket.com/albums/...ps06e4f8af.jpghttp://i1280.photobucket.com/albums/...psffd00275.jpghttp://i1280.photobucket.com/albums/...psbfef6a66.jpghttp://i1280.photobucket.com/albums/...psb50dde5c.jpghttp://i1280.photobucket.com/albums/...ps1e38b5cd.jpg
Are you planning on attaching your BW's wheels directly to the motors in the above picture? If so, your robot will be going nowhere.
DC electric motors, particularly small ones like that, spin at very high speeds but do not have a lot of torque (turning force). In order to be able to move a robot, motors have to go through some form of reduction (gearbox, chains, pulleys etc) that lowers the RPM of the motor but increases torque to a usable level.
Yes, i was planning on putting the wheels straight on to the motor shafts. This is because i based it on Melty B, which was an american antweight (1pound) weight so the motors on that were smaller.
Hello, time for an update. The wheels from technobots arrived yesterday and fit nicely.
http://i1280.photobucket.com/albums/...ps8aa2724f.jpghttp://i1280.photobucket.com/albums/...psd751fccc.jpghttp://i1280.photobucket.com/albums/...ps99285774.jpg
I am also considering using 2 brushless scorpion motors for drive/weapon as ampflow motors seem too big and too expensive. Please let me know your thoughts on this.
Thanks.
brushless my not be the greatest idea as they have less power at lower a rpm, so it will have a high current when driving in a normal non spinning mode, if you have one. if you plan to only drive it while spinning then it should be fine. But i don't suggest this as before and after fights its useful to be able to drive in a safer mode, and it could be used tactically. So i think brushed would be better
Thanks for the reply, my original idea was to swap out the scorpion motors for some cheap Ebay brushed ones for non-spinner events. But if you suggest using brushed motors all of the time, then which ones would have the power and 2 would have to fit in a 25cm circle.
Would two of these be ok?
http://www.scorpionsystem.com/catalog/m ... 4015-1450/
the kv of a motor is like RPM per VOLT.
in this case we have 1450K/V
if you run this on 20v (to make the maths easy)
you will get 29,000 RPM
which is quite a lot.
Say you run this on some 5inch wheels (to keep the maths easy)
you get 455530 inches per minuite.
Is it just me or is that about 432 miles per hour.
The maths is probably completley wrong but the message is.
Thats WWAAYY toooo fast.
Im not quite sure what you should aim for as an rpm.
Also bear this in mind.
speed can be changed by gears.
simple.
However gearing systems can be quite expensive and be huge and weigh tons.
Tips
If there is something that possesses you to waste money on a brushless drive get a low kv one
Also if you are in the states can you just edit your location to say U.S.A or someting.
We can probably link you some parts from america in $ for the future.
WOW thats a long post.
Good luck with the build anyway
In any case, you will need gearing. Unless you have an absolutely huge motor and small wheels a featherweight scale machine won't even move without some sort of reduction.
Ignore brushless for this application. It's not as simple as turning on and off a mosfet as with a dc motor. They also don't like being stalled or turned on and off quickly. Either on full or off for brushless. You have to remember you can't just hook them straight up to a battery to get them to work.
Stick to brushed motors for a melty brained machine
Thanks for the replies, yes i was planning to use a gear box.
Typhoon Driver, if it HAS to be brushed, then which brushed motor do you suggest.
Archie2000, brushless is not a waste of money and i don't live in the USA.
Are we looking at feather or beetle?
This is my beetleweight:
http://i1280.photobucket.com/albums/...psd751fccc.jpg
And the scorpion motors would be for my featherweight. I will plan to use 75mm Robochallenge wheels, a gearbox made by erm...me, and it will be controlled by an Arduino Uno and an Arduino Proto board onto which i will solder my own motor control circuit. I know you keep saying to go brushed, but only 2 brushed motors i know of will do the job: ampflow motor (too big and expensive), and 2 Astroflight 40 cobalt motors (extremely expensive). If you have any ideas of any brushed motors, please tell me.
Speed 900's might do it. However they are no longer in production. People have been seeking out alternatives and have found some that are pretty much identical. I don't know what they are called but the only S900's were dam good for their size and not ridiculously expensive either at £35 each. There is a thread somewhere called speed 900's alternatives but I cant find at atm.
viewtopic.php?p=138153
There is a topic on using brushless for drive- I don't know what ever came of the idea.
I imagine you would struggle to break and accelerate and control a brushless motor fast enough for a melty brain robot and you will probably spend a fortune on gearing it down.
If you do go for brushless then you want a very large gear ratio so the motors can spin at maximum rpm easily and so draw little current- you don't want them under high strain.
It could be a possibly to connect 2 motors together but that also has its problems, for instance 2 gimson motors per wheel
And you are able to control a 3 phase motor?
http://www.active-robots.com/motors-whe ... 0-150.html
Or if you want a really powerful cheap motor then look at something like motorcycle starter motors. Although these will draw large currents.
You might consider the Dewalt 24v brushed motor. Good power, cheap and proven on the battlefield.
Sam, is that the motor you used to power NST's bar?
If so then i will look into that. Where did you get yours from?
Just found it on robot market place, and it looks ideal. Would i need a gearbox?
Sorry for all the questions and thanks for the suggestions.
Yes you will need a gearbox. You can also purchase those on RBMP
It's one of the best brushed motors around, maybe that some high end brushed RC motors can push more power, but you'll pay a premium then.Quote:
Originally Posted by Mega Masher
Yes. Even if only to protect the motor from the full brunt of the hits. The motoraxle is rather slim compared to what we see as needed on disks and drums.Quote:
Would i need a gearbox?
I think these are the drills with those good motor's/gearboxes that NST uses.
http://www.ebay.co.uk/itm/2x-dewalt-24v ... 4171782033
They occasionally come up very cheap on ebay.
just going back to the wheels.
I got some of the red 100mm robochallange wheels if you would need them later in your project just send me a pm
And join me with my adventures to find a powerful brushless motor.
99% utter junk :/
viewtopic.php?f=111&t=5190
Thanks for the replies, i will get some of those motors soon. Anyone got it's dimentions, as i will probrably have to make the base plate bigger for 2 of the motors. Archie i have a suggestion for a very powerful brushless motor:http://www.scorpionsystem.com/catalo...0/HK_7050_340/
I'm not sure why you would ask me but ok.
that motor seemed quite bit costly and overpowerfull.
why don't you try hobby king and search hy outrunner weight.
they have motors less than 200kv
I think the more winds you put into a motor the more tourque it has so more winds = more weight
I think that's why heavier motors have lower rpm (usually)
http://www.hobbyking.com/hobbyking/stor ... Order=desc
Thanks for the reply, does anyone know the size of the 24v Dewalt motor? Any reccomendations for batteries?
Go for a high quality lipo