Surprising Information On Everything To Know About Hexapod Robot Vehicles

Hexapod Robot

 

Hexapod robots were designed years ago for pilot training and amusement rides. They are also called parallel kinematic machines. With time, their applicability has stepped into fields of micron precision, motion tests in laboratories, and quality inspections for different mechanical products.

Hexapod Robot - Parallel Kinematic Machines

Hexapod robots (also known as parallel kinematic machines) were designed many years ago for amusement rides and later mostly know as flight simulators for pilot training. Over the years new designs of the parallel kinematic machines were developed for the micron precision world of manufacturing, laboratories motion needs and product inspection. Although many modern-day Hexapod robot companies tout nanometer resolution or repeatability, the real issue with Hexapod robots for the new world of nano precision is 6-D Nano Precision®.

Hexapod robots have 12 joints or flexures at both ends of the 6 moving linear links each with on-axis and off-axis motion errors. These 6 links once integrated into the Hexapod robots yield stiffness issues which also add to the total system error even when installing forward and inverse motion equations. The summation of all errors will not allow any hexapod robots to be a True Nano® positioning motion platform. In today’s nano precision world the path or straightness of motion is critical. On the other hand, PKM’s still have real nano value when investigating tripods. ALIO has been designing and improving 6 and 3-axis PKM’s for the industry since 2001 with emphasis on the 3-axis tripod mounted on linear axes to improve the hexapod robot precision.

Table of Content

Hexapod Robot

The ALIO linear motor Tripod has infinite resolution with less than 10 nm repeatability and accuracy less than 100 nanometers. Mounted on a Nano-precision linear XY motion system for 5-axis or with adding an optional rotary to provide full 6 axis “Hybrid Hexapod” motion. ALIO’s Hybrid PKM Motion System offers significant advantages over the traditional hexapod robots from an order of magnitude more precision to increased work envelope with significant improvement in stiffness.

Novel or evolutionary 6-D Nano Precision® is a natural for nano precision systems for the present and future. ALIO’s hybrid parallel kinematic motion solutions with forward and inverse kinematics allows for complex hexapod-like motion with simple tool center point programming. ALIO’s offers G-code programming solutions for true CAD-Cam processing with True Nano® precision.

The ALIO Hybrid 6-D Motion Platform product line is scalable from 5 mm to over a meter of travel moving 100’s of kilograms of mass. No matter the product size needed for the application the ALIO Hybrid 6-D Motion system will maintain precision to at least an order of magnitude better than stacked stages or traditional Hexapod robots. The simplicity of moving one axis verses six axes to make a straight line while increasing the work zone volume and stiffness of the structure is what the ALIO Hybrid was designed and built to excel at.

In conclusion, hexapod robots will still have many applications that they are well suited to handle just not in the 6-D Nano Precision® world of applications. True Nano® applications, especially ones that need flatness and straightness of motion plus stiffness for machining and bonding applications will be better served with an ALIO Hybrid system.

Hexapod

To know more about the surprising facts of these Hexapod robot vehicles, continue reading at your leisure:

How Does A Hexapod Robot Work?

Hexapod robot have six mechanical legs for kinetic movements. Each of its legs has three servos. One is used for up/down movement, next is for forward/backward steps, and last is the one that helps the leg to bend in the middle. But the total servos can further be manipulated according to the need for flexibility on the surface.

These legs and servos make it easier for Hexapod robot vehicles to move in any direction, controlled by the remotes. We can call it as a three degree of freedom, but this can vary depending upon the model that has been manufactured like at ALIO Industries.

This vehicle is controlled by a remote from a distance. Through this remote, you can start and stop the robot. Or you can control the speed and movements of this Hexapod robot vehicle. Moreover, there can be options to adjust the position of its leg if it is embedded in the internal coding already.

What Makes An Ant A Hexapod Robot?

Hexapod robot can be symmetrical and asymmetrical, like the ones at ALIO Industries. The one robot which is rectangular with six legs evenly distributed on two sides forms a figure similar to an ant. But, typically, the normal degree of freedom is from two to six.

So, for ants to be Hexapod robot, they carry four segments: tarsus, tibia, coxa, and femur. Like the servos, there’s a hinge joint between these segments that helps ants to move their leg and bend them accordingly.

What is Quadruped Hexapod Robot?

A Hexapod Robot to be called quadruped has to have a rectangular shape with legs divided into three groups. During the gait of this robotic vehicle, two legs remain in the air for the robot to move and accelerate its steps.

Whereas, the remaining four legs are on the ground, trying to push the bodyweight ahead, in a similar direction. This is the gait that Hexapod robots use to prove the fault-tolerant ability. This gait focuses on moving the robot ahead, even when one pair of the leg is faulty or in air. The turning ability of this robot is more advantageous within [-30 30] degrees.

Advantages & Disadvantages


Advantages

Disadvantages

  • Hexapod robot vehicles are used for their ability to move faster and flexibly.
  • It’s not easy to decide which leg should be moved in the air first or last for a perfect gait.
  • Hexapod robot easily maintains the stride stability on more than three legs.
  • They have a complex design, including actuators, transmissions, sensors, servos motors, etc., making it difficult to comprehend for beginners.
  • These robots can use either one or two and more legs to perform complex operations