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Thread: Artist in need of help
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03-17-2016, 07:11 PM #1
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Artist in need of help
Hello all... ive been redirected from another forum that i also asked...
Im making this sculpture and i need variable speed motor... i need it to spin about 50 rpm- 80 rpm... i dont know exactly... i must improvise speed to achieve the desired result.... This is the thing i made and it isnt working... because the motor is brushless.... The thing on motor is barbq stick with magnet and counter weigh for stability...
http://oi67.tinypic.com/n4dok.jpg
They told me it was maybe stepper motor?
http://www.ebay.com/itm/Geeetech-ste...IAAOSwBLlVEoS~
I need exactly name of the controller and motor so i can order it on ebay... thank u all very much!
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03-18-2016, 01:43 AM #2
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It is a NEMA stepper motor and to make it rotate you need some electronic circuits. These can be (but are not limited to) Raspberry Pi, PC Arduino and a miriad of other options that would be far too long to list.
What you choose to drive it with does depend on what you want to do with it but whatever you choose it will need programming in order to work.
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03-18-2016, 05:22 AM #3
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im very suprised that it is that difficult to achieve... we see tons of motors and just this task to make it variable rpm becomes so hard... I really need this because im making something extraordinary ...
I need detailed guidance in how to make this motor... The motor will not have much friction in its purpose it will have contact with ferrofluid and thats it... So , i would need to buy stepper motor and what more? couldnt i just buy some know controller?
something like this?
http://www.ebay.com/itm/4-phase-5-wi...4AAOSwgQ9VuCmyLast edited by dmhmaestro; 03-18-2016 at 05:32 AM.
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03-18-2016, 06:27 AM #4
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Yes you could just buy that and you could manually control the rotations and positions. If you are happy doing that then you are sorted but most people using steppers want them to rotate at very specific, repeatable speeds between known start and finish points.
None of it is difficult, in fact it is quite trivial but solving a problem without having the problem defined is never possible no matter what it is.
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03-18-2016, 03:57 PM #5
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If all you're trying to do is rotate a turntable at a variable speed, you don't need a stepper motor or the associated electronic circuitry that makes it run, which can be fairly expensive. All you need is a simple DC motor with a potentiometer to limit the voltage it gets. The less voltage one of these motors gets, the slower it goes. There are also more elaborate speed controllers that modulate current as well as voltage. You can run it off a battery or through a "wall wart" transformer. In the RPM range you're talking about, you probably want a gear-motor, which trades some of its excess speed for torque. Here's a selection to choose from: https://www.surpluscenter.com/Electr...DC-Gearmotors/
Andrew Werby
Juxtamorph.com
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03-21-2016, 09:15 AM #6
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03-21-2016, 09:19 AM #7
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There is a bunch of items in the link u sent me... can u please be more specific so i can check the motor i need?
I though this is going to be so easy task... i just need small motor to rotate at variable speed and i cannot find the answer to my quest, and its holding my project down
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03-22-2016, 03:30 PM #8
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- Aug 2015
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You could just use RC parts from hobbyking.com.
you'd need 3 things:
1) brushless motor http://www.hobbyking.com/hobbyking/s...00kv_17g_.html
2) brushless speed control http://www.hobbyking.com/hobbyking/s...EC_2_3S_V.html
3) servo tester (to adjust speed without hooking it up to a RC radio) http://www.hobbyking.com/hobbyking/s...vo_Tester.html
Shouldn't cost you more than $25 for all of this
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03-22-2016, 03:58 PM #9
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03-23-2016, 02:56 PM #10
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I can't tell you what motor to buy, since you haven't told us whether this sculpture of yours is a 5 ton piece of stone on a 2-meter turntable or a 2 gram piece of foam on a 5 cm disc. The torque required from the motor is going to be different in these two circumstances, and the price of the former will be considerably higher than the latter.
Andrew Werby
www.computersculpture.com
Printer will print perfect...
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