Two arm structure + Motor

Projects General Guidance
1

I need some help with a new (first) project. I want to build a simple two-arm structure with 3 axes powered by Arduino + motor.

In the uploaded figure I have tried to sketch the idea:

  • Axis: black dots
  • Arms: yellow + red attached to the motor
  • Motor: green

The upper dot axis is to be fixed so that the longer yellow arm ends up doing 30-45deg range. The solution should be able to work up 2-3Hz and for 8-10 hours.

This is my first Arduino project so I have searched a lot and have even more questions.

Any help with the hardware that I should buy would be AWESOME! Thank you so much for your help

scheme
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2

Number one: Determine the torque needed from the motors.

4

Thank you for your comment. The Torque needed will be 2.5 to a max of 3 Nm.

5

So, motor power would be approximately:
3Nm * 20 RPM / 9.55 = 6.3 Watts.
OOPS! Should be:
180 RPM * 3Nm / 9.55 = 56.6 Watts.
Constant 9.55 = approximately 60 / (2 * Pi), 9.54929658551.

6

Good! You know it! It looks like a geared motor to me. Regardless of the motor a suitable (for the motor) driver is needed. Looks like a lot of motors that would do well.

8

Can I ask 2 more minutes of your time?
Can you please help me choosing the correct arruino + motor driver + motor (able of running a daily 8-10hours)?

Thank you so much!!!!!

9

Thank you for expanding and detailing on the motor specs. This is my first project and I am a bit lost on what the hardware to buy (arduino + driver + motor) and making sure I don’t end up spending money incorrectly. Any hardware that you would advise?

Thank you!

10

´The motor is the key question. You need a heavy duty industrial motor to run that intensively. One parameter to look at is : intermittency. You need a 100% intermittency factor motor. Those will not overheat and burn.
Driver call for the same but ought to be easy to find. Arduino.... You can use more or less any one.
One matter is what is available at You location.

11

Thanks - I will dive into motor intermittency.

I was able to build a prototype based on a old Bosh drill machine :slight_smile: I now would like to build an arduino-based solution that I can program and gain fine tune control … but I am jumping to the unknown.

Thanks for all the support and tips.

12

I might be missing something… What does the Arduino have to do ?

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Most probably I am the one missing …. I am trying to build a system that I can control programmatically. Arduino came into my mind as a solution. But again, I am new to this space so I can be just mistaken.

14

Once You find a motor, look for power supply. Voltage and amps.
Pololo has a lot of useful drivers once You've got the motor. Do You have any power supply already? 12 or 24 volt are common. 5 - 10 amps ought to work.

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For now the only thing I have is my willingness to do it and these comments to my question :grinning: I am literately starting from a blank page.

16

If You're prepared to spend money of something that can be good for a prototype but not sturdy enough for full services, go ahead.
The mechanical parts calls for attention that we don't know about.
Then the rest is a handy project, no real difficulties like radio comms, servers, ......

17

Ok, but what are you hoping the Arduino will do during that 8 hour run period?
All I can see, is the lower left joint will wander back and forth - driven by the motor and eccentric couplings.

18

If I am able to program everything prior … the answer is nothing. During the period there will not be any information to drive the structure. In fact, the only thing I would like to do is randomly change the speed throughout the period. Nothing else.

19

Thanks. I will try to get the hardware list in the coming days.

20

Thanks for correcting.

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