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Mikrolar is now offering its proprietary actuators for sale.

Actuator accuracy, axial and radial rigidity is essential in the production of quality Stewart Platforms. We have used a number of actuator manufacturers over the years and what we have usually found is that we always needed to "tweak" the actuators. Because the actuators are only held at each end and not along the body itself the interior construction is very important.

Why Mikrolar actuators? Axial and Radial stiffness.

Most actuators have decent axial stiffness, the ability to resist tension and compression along the length of the rod. Most people equate this with rod diameter and diameter of the screw. But they also need to take into account any backlash from preload on the nut, the drive train and anti-rotaion devices. Axial stiffness directly determines accuracy of length, and results in chatter if done poorly.

Most actuators do not have very good radial stiffness, the ability to resist forces from the side. While there are many reasons for this, one large contributor is the nose bushing. If this bushing is too loose the rod can move around. While this might have only a very small affect on overall length of the actuator (the delta difference is minor) it can cause huge stiffness issues. Picture a table with four legs. Place a small joint in the center of each leg and allow it to flop around just a little. Now picture the table top moving around as these small joints allow it to. Radial stiffness directly determines machine stiffness.

Software Mapping

Along with hardware improvements Mikrolar has also developed software for use with the actuators to further improve overall accuracy. Actuators can also be specially ordered with linear encoders for improved positional accuracy.

Software mapping with actuator loading

Mikrolar Actuator Mapping Jig

Linear encoder assembly

Linear Encoder Assembly

Mikro Actuator

The Mikro Actuator Line

The M Series