Sorry For my bad English. I will start to make a mini conveyor (100 cm x 30 cm) with an Arduino Uno.
What is the best motor should I choose for my project ? - Stepper Motor ? - DC Motor ? Etc.
Please help me, I am Newbie.
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I second the suggestion that a stepper motor might be a more suitable drive mechanism. There are a lot of stepper motors for sale on line for very low cost that can provide great accuracy. They are an amazing value, probably because of so many robotics projects to supply. Their native accuracy can be enhanced many times by use of what is called a "micro-step" driver. The micro-step driver can transform a stepper motor that has 200 native steps per revolution to one that effectively has 2000 or more steps per revolution. I have found repeatability to be excellent. They are used commonly to drive precision CNC machines.
And you are correct that if you don't need the fastest motion, a gear reduction can enhance accuracy even more. There are small stepper motors with affixed gear boxes sold as sets. Consider a size NEMA 17 stepper motor for a small and inexpensive, but well engineered, motor.
A coupled worm gear box has the advantage that it serves as a natural brake if there is any tendency for system weight to move the laser in certain positions, but gear reduction means that fast motion require higher motor rpm's.
The Accel_Stepper library has worked well for me in helping to get them to function smoothly. It helps a lot to make it easy to integrate the stepper with Arduino, and it is fairly user-friendly.