Graupner motors

[razerdave]

Re: Graupner motors

Archie:
As someone who has built a powerful rambot, there is a lot to learn in the process for that kind of robot alone. I started with a drill powered rambot, then when I went for a more powerful set up, I had a lot of knowledge from the previous one, but even so, I have had to replace every bit of Satanix between 2009 and now except the chassis.

Its best to learn what works and what doesn't through experience. The simpler the robot, the less to go wrong.

[Ellis]

Re: Graupner motors

I 100% agree that a simple machine should be built as a first project. But, the impression seems to be that a 4WD drill powered or Gimson powered robot is nothing especially good or powerful. This is absolutely untrue. 4 over-volted drills and you're flying.

12v drills (cheapest on the market) at 18v, wire that can handle the current, batteries that can supply the current (crucial), and of course ESCs that can handle the current, and you'll have a FW with a very real power advantage over many other machines. Design it well and get some driving practice in, and you'll have all the push you'd ever want from a first robot. Don't think you'll be a pushover (lol) if you opt for drills or Gimsons. Blowing our own trumpet a little, I'd say Tormenta had more drive power than most, or certainly many, of the robots at the 2012 champs.

I am glad that you are seeing a more realistic side to this! Hey, we all went there, I recall wanting Ampflow A28-150s for my first feather.

[Anttazz]

Re: Graupner motors

Jamie just posted a link to my 4WD Argos drill powered FW and its pretty nippy. Its no world beater but its good enough to start off with and its nice and simple. Most importantly, if a motor blows, its less than £15 for a whole new unit. Gimson motors didn't exist when we built that one but they're definitely a strong contender for both beginner and advanced robots now. Just use good quality parts as Ellis said, good batteries and good speed controller and it'll be a good robot, and if you decide you want to do something else, those components are transferrable. Better to spend a bit more now than to spend a cumulatively high amount over the course of the robots life.

[archie2000]

Re: Graupner motors

ok it was Dave's advice i really needed.
i will get the cheapest stuff possible and learn from that

[archie2000]

Re: Graupner motors

ok i have acepted the fact i would need to start simple (then give the robot to my brother)
but i still have a few questions.
Should I try and buy that vanteq/roboteq (sorry i forgot which one) of john from RR?
because they weigh 1.1kg would they be anygood with no/lighter heatsink?
my only real concern for my cheap robot would be speed control,
I suppose i could try a bang bang servo board (i think they're called that)
Because if i waste too much money on it my powerful rammer will be rubbish (but will work better i suppose)
could one be built with unused radio gear for <£50? if i use drill motors, batteries, gearbox and charger
i know clearly i should build a cheap one but i cant get that expensive one out of my head.I have a not to scale CAD but i have had to think about the price. so for drive i will use 4/8 of the banebots 2.7/8 inch wheels 0.8inch wide 40 shore $4.50 each. motors are quite likley to be rs-775s and i will probarbly go for 4 of them on 6/7 cell lipo $18.50 (i think) each. for my gears they will be mod 1.5 using 12t and 40t and 30t gears so a 12t on my motor to a 40t to 12t to 40t to 12t to 30t on my wheel. thats a good £30-£40 of gears i am more than happy to pay if they work. then my £100 speedo and some batteries
£300 ish

[harry hills]

Re: Graupner motors

YOU should stay away from lipos.

[archie2000]

Re: Graupner motors

ok nimhs nicads whatever
the reason i posted that list is so people can edit it and make it sound reasonable
thanks haz

[archie2000]

Re: Graupner motors

how do you know if a brushless motor will do forwards and reverse?

[Laser]

Re: Graupner motors

you have just ignored what everyone said :|

get 2 drills, 2 elctronizes, giant cod radio gear, 12v 3300mah nimh battery from compenent shop, 2 100mm blue wheels from robochalleng and some hdpe

make a robot out of that.

Stay away from the rs-775's and gears.

[plargen]

Re: Graupner motors

if you want a couple of powerful drill motors these would probably be good they have allot of torque and the rpm is high so should be quite nippy
http://www.ebay.co.uk/itm/180834588245? ... 712wt_1037

[typhoon_driver]

Re: Graupner motors

I'm all done posting here. When you are willing to actually take advice on board I will be happy to help. Until then I'm out.

[razerdave]

Re: Graupner motors

Ben and Gary: He has just asked a question. He hasn't said what for. It's better just to answer.

Archie: with brushless motors, they have 3 wires. If it spins, say clockwise and you want it to spin anti clockwise, you swap over 2 of the 3 wires. There is no set pattern to this, so just swap until it does what you want.

So you know, brushless motors don't reverse direction on a normal brushless ESC. That's why people don't use them for drive motors.

[Laser]

Re: Graupner motors

sadly i'm with gary.

I'm bored of posting the same answer again and again, and this guy wont listen to us....

[archie2000]

Re: Graupner motors

i have already said i will start simple.
i am listening and have taken your advice on board.
the reason i posted that list is so i can sort out how much money to spend on my first simple robot.
i just wanted to know more about robots.
sorry if it sounds like I'm not doing as you say
oh yeah thanks for the info dave

[archie2000]

Re: Graupner motors

ok sorry for that
now i have my advice taking hat on would these do for drive whilst they're cheap?
http://m.diy.com/mt/www.diy.com/nav/fix ... t#features
if you can stop the hammer function on it, they are seriously.powerful.drive motors
i will try to get something from eBay/car boot sales
on 18v is that near 1hp?
may take a bit if modifying though.
and for johnnos speed control (if someone hasn't alreagy bought it) should i get it?
that will handle a few of those drills won't it
i hope i haven't said anything stupid again