Hello guys!
I'm making a two axis slider, but I have a little problem with the motor selction
With a motor I want move horizontally or vertically 2Kg of things...on this slide I want to add another motor for the rotation
For start, can you help me to fine the right motor with the right torque for this application?? I prefer something about 5V or 12V and use the A4988 driver or similar (I will choose it for the littel dimension)
Speed and precision for now is not a problem I wait your opinion thank you!
1 -Because I want use it without AC just battery
2 -The dimension I don't think but the weight have affect on the weight to move (the horizontal motor I don't think but the rotation motor I have to install on the slide)
Stepper motors are very inefficient and not suited to battery operation. Also they perform better with higher voltages - I think an A4988 can go to 30v or more.
The choice of stepper motor depends on the torque required. There is a suggestion for a simple way of measuring torque in Stepper Motor Basics
Understand.. So for this application are better servo motor?
Because the maximum speed isn't a problem but I liked to send position and speed and I didn't find a library for make this with servo..
I choose stepper motor just for this problem... But I prefer servo for precision and dimension.. There's a library for command the position at a programmable speed?
When you say "servo" do you mean a hobby servo such as are used for controlling model aircraft?
A stepper motor should be much more precise than a hobby servo. But hobby servos are very easy to work with. Control them with the Arduino Servo library.
Yes...in realty I don't want unplug my dji phantom 3 drone motor
Thank you Robin2 for your time, but from what I see on internet to the hobby servo I can say "Go to 0°" or "Go to 180°"
And It can be usefull for the rotation on the slide...
But for the slide I need something "make 13mm at speed 0.1mm/s" or (from a 0 reference) "make 15000mm at speed 100mm/s" or having a speed in percentual...
And from what I see is not easy to do with servo, or I'm in error?
Now I was thinking about a DC motor with a rotative encoder...but I have some fear for the cicle time and the encoder task, resolution and maximum speed..
Because sometime I need to move something like 2.5mm every 30sec...Some time I need to make 1500mm in 5 seconds or a little more.....(but for this I can use switch and don't take in consideration encoder)
forna91:
Now I was thinking about a DC motor with a rotative encoder...but I have some fear for the cicle time and the encoder task, resolution and maximum speed..
Because sometime I need to move something like 2.5mm every 30sec...Some time I need to make 1500mm in 5 seconds or a little more.....(but for this I can use switch and don't take in consideration encoder)
That is a huge range of speeds - a ratio of 3600:1 if my maths is correct.
And I agree it is unlikely to be practical to control a continuous rotation hobby servo to get specific speeds without using a rotary encoder. In effect a continuous rotation servo is just a DC motor in a convenient package.
A stepper motor has the advantage that it can step as slowly as you like. But when doing that it will be jerky - maybe that is OK. Using microstepping would make it smoother - but not completely smooth like a DC motor with a large gear reduction.
Making a stepper motor work fast is a bigger challenge and I can't fiigure from your data how many steps per second might be needed for 1500mm in 5 secs.
But it may be an even bigger challenge to make a DC motor with a large gear reduction reach the desired top speed.
But now I want remake this with a belt (moved from a motor on the end) for move the slide and (why not) on the slide I want put a "pan" controller...
Why this difference of speed??
I used the slide for making some cool videos, now I wanna convert from a hand slide to an automatized slide...all this for make a milkway hyperlapse....
And I would like use the slide in Horizontal and in Vertical (<- this is the problem!)
Looking on internet there's some of this ready to buy....but I spend already too much for reflex
I can olso use it only in plane, so I can save too much needed torque (I see around youtube too many people use stepper nema 17) The reflex is around 2Kg..And I have alredy to buy the belt and the pulley (I'm waiting to choose the motor)
The maximum speed we can thinking about it...maybe 300mm/s are too much olso, 100mm/s is ok...
When i made a hyperlapse in the night I have to stay in position for shoooting time (20sec) waiting the elaboration time and move of the slide of a certain space
Other problem: MOBILITY when I make hyperlapse I can't find 230V ac in the top of a mountain...a car battery should be the maximum acceptable...
I would measure the force needed with a bit of string and a pan to which I can add weights until there is enough to cause movement. It will take account of friction and will probably be accurate enough for motor selection.
From the test I made I need 50Ncm for the horizontal movement and 100Nm for vertical moviment
Yesterday I was thinking about the fuction of the slider...
For delete all the problem I prefer a slowly maximu speed but a better precision, for delete the battery problem I would use a dc motor geared with an encoder like this AEAT-601B-F06
But now the question....where I can find a dc geared motor maybe with encoder??
