As said in the title can it be used with said arduino and can it turn 2kg at 250mm diametre circle with motor in the centre.
You need a motor with a torque of at least 25kg-cm
Yes an Uno can control a NEMA17 stepper. You will need a driver capable of supplying the current required by the stepper coils and appropriate for the modern bipolar stepper motor. That leaves out the ancient boat anchor L29x drivers.
If you post the data sheet for the motor, we can help you to choose an appropriate driver and power supply.
Pololu has a great selection of stepper motors and stepper drivers.
Choose a motor based on the amount of torque required to move your load at the required speed.
The power supply voltage may need to be some minimum depending on the stepper driver. If you want the maximum torque and speed the supply voltage would be the maximum allowed by the driver.
The answer is No. You need powersupply and driver for the stepper.
Just use normal physics. 2 * 9.81 * 0.25/2 = 2.45 Nm is needed from the stepper. Nema tells nothing in that respect. You need to do better, provide a link to the datasheet of the stepper in question.
Your calculation looks like... ?
I corrected it, and actually it's kgf but the motor manufacturers use oz-in and g-cm
Our number are the same but I don't think that @joe123846 understands about how NEMA size has nothing to do with torque
Just asked for fun. Yes, several different units are used. Actually Nm is used now and then! I use a 3 Nm for my rotating table and the mech face is a Nema 23.....
Is your 250mm circle vertical or horizontal?
here are specs for motor and here is what needs to be turned. The big circle is 250mm dimetre and the stepper will go in the middle.
and here is the CAD of teh thing that will spin and as i said that it will be a circle with 250mm and will weigh roughly 1.5kg.
Will the round "thing" be vertically or horizontally oriented?
horizontal
sorry i didnt see your message before
it will be in the centre of the circle and rotate horizontally
So now it gets a little complicated.
The calculations to find the torque needed will depend on how fast you want to accelerate the "thing", that is how fast do you want to go from a standing stop to say 1000 RPM?
1 second 10 seconds 60 seconds? The longer the time, the less torque you will need and the smaller the motor you can use.
i want it to turn 90 degrees every 5 seconds.
i dont mind if it goes up to 6 seconds. What stepper would you recomend that works with an arduino uno/ egeloo uno. And would the Nema 17 or 23 be okay
The NEMA number only specifies the physical dimensions of the motor, it has nothing to do with torque, voltage, current etc.
I calculated that you will need a torque of about 0.15Nm, so the motor you show in post 9 will work
Most critical will be the mechanism you use. Are you going to attach directly to the stepper motor shaft? Too much torque will rip the attachment out of your circle device. Are you including a thrust bearing in your design? Stepper motors normally do not have a built-in axial thrust bearing.