Stepper motors are inexpensive and inferior to servo. They rapidly loose torque and precision with speed increase and may cause vibration/resonance issues. On the other hand they perform solid when used at low speeds. Their low-speed torque is similar to this of a SERVO motor and if they are used in a quality system within the adequate speed range they would seldom (or never) miss steps and do not require error corrections (closed loop). Actually this is main reason for the use of steppers - they DO NOT require a closed loop.
The closed loop steppers use a basic method of step count verification. That is useful in low-speed system that have to overcome major changes of loads and friction. They have very limited programing and tuning capabilities and are normally used only in slow rotary CNC machines. At high speeds they are as unreliable as the open loop steppers because that is inherited in the stepper technology itself and cannot be overcame by the simple use of a step counter. Of course the laser machines don’t have the problem with changing loads and friction at low-speed therefore the laser machine manufactures do not use closed loop steppers as they are more expensive and provide only minor advantage. In fact Thunderlaser is the only laser brand I know of that is using closed loop steppers for laser machines.
The SERVO systems provide perfect control over any motion aspect in pretty much any condition. Their advanced encoders can be programed to dynamically change the operation to control velocity, vibration, torque, compensate load and friction at any practical speed for perfectly smooth and precise motion, without errors. They are the ultimate choice when it comes to laser machines. All high-quality brands use them excessively for their mid. and high-end lines. The only disadvantage the Servo technology is the cost which is drastically higher than that of a stepper.
The Leadshine’s “EASY SERVO” is not a technical term. It is invented by their marketing team in reference to their closed loop steppers. Leadshine is the only brand that uses this term and probably many engineers would be annoyed by it. It is a “half lie”. I am saying “half” because on their website Leadshine clearly distinguishes their (real) servo calling it simply “SERVO” from the CL steppers calling them “EASY” servo. Of course if you take the “EASY” part the half-lie becomes a full-lie… I am sure a lot of Chinese manufacturers are tempted to lie in their specifications in order to increase their sales but Thunderlaser is the only brand bold enough to actually do it. Now and then I hear in this forum how people chose Thunderlaser over other brands because of their SERVO… I feel bad for them because with the money they paid to Thunderlaser they could have purchased a machine with a real SERVO from an honest brand. If Thunderlaser was a USA company probably there would have been a dozen a lawsuits filed against them by now for false specifications.
Nolan, please don’t take it personally. I know you are not the person behind this. I strongly suggest you speak with the right manager in your company to correct it. It may seem as a “good business” to deceive clients but in long term it may harm the reputation of the brand as nothing else. All your hard work for promoting the brand here in the forum with samples and videos would not be enough to compensate the perception of dishonesty.