In the recently published ‘Strength and geometry parameters accuracy improvement of 3D printed polymer gears,’ the authors focus on refining strength and precision in FDM 3D printing. Here, rotary motion is explored, as the Russian research team takes the opportunity to examine the improvement of polymer gears.
In line with the International Standard, according to 12 gears accuracy, ratings include kinematic accuracy, contact, and gear backlash fluency. The polymers featured exhibited the following:
- Low elastic modulus
- Significant linear expansion coefficient
- Shrinkage at the stiffening
- Parts dimensional instability
The researchers state that all these items show that polymer gears can meet the challenge of an 8…12 accuracy rating.
Previous approaches have aimed at reducing material and overhangs in more complex geometries. Here the goal was to outline the gears coordinate system, define the shortest functional dimensional communications with basic elements, and ‘actualize’ FDM techniques, along with slicing software.
A gear works from the basic design datum and a sectional involute element. The basic element consists of the A4 base, the B1 base, and the C1 base.
While the basic three design datum set limits six degrees of freedom, the researchers state that at the same time neither of the six is doubled. Ultimately, six coordinates are enough in the case of the sectional involute element; however, the researchers state that it is unreasonable to set any coordinate relating Yθ coordinate axis having zero informativity, as it would lead to ‘both redundant over-positioning and location uncertainty.’
The researchers saw that additive techniques can be advantageous over conventional ones because of the datum sets, however, in considering the OX2YθZ4 basic coordinate system of the basic gear design datum, geometrical accuracy will increase with numerical coordinates values and ‘reduction of printing parts model points.
One of the disadvantages, however, is the contravention of the base and the inversion unanimity principle.
“To avoid over-positioning, it is recommended to equip the printer with the building as the functional locating tool, which is regulated by the two-angle. The work locating plane is positioned normal to the Zрθ printer axis, which is parallel to the nozzle movement. The table central hole axis can be used as the J2 auxiliary base whereby the XpO, YрO, ZрO zero-point coordinates of the OX2YθZ4 gear coordinate system are set at the 3D operation procedure,” concluded the researchers.
“Moreover, following the inversion principle the gear needs to move the same way as the one turning the А4 basic hole axis. It is impossible for 3D printers based on the conventional Cartesian coordinates system. The facts listed agree with conclusions presented regarding reasonability of 3D printer construction based on cylindrical coordinate systems.”
3D printing is attractive to engineers around the world, meaning that gears are often part of the equation for moving parts, from those made for toy race cars to spur gears, and even research studies centered around the strength of gears.
What do you think of this news? Let us know your thoughts; join the discussion of this and other 3D printing topics at 3DPrintBoard.com.[Source / Images: ‘Strength and geometry parameters accuracy improvement of 3D printed polymer gears’]
You May Also Like
Generative Design, Digital Twin, WAAM 3D Printing Used to Optimize Industrial Robot Arm
3D printing specialist MX3D has been working on a metal AM technology to create large items, such as bicycles and bridges, using robots. Now, the Dutch startup has partnered up...
Siemens and CEAD Develop Hybrid 3D Printing Robotic Arm
3D printing with continuous reinforcement fibers, like carbon fiber, is just now starting to come into its own, with numerous startups developing their own unique approaches to the concept. Their...
3D Print the New Youbionic Human Arm at Home or Through a Service
Youbionic, founded in 2015, has recently released its new Human Arm. The wildly creative Italian tech startup is on a mission to accentuate already sophisticated technology around the world, while...
Developing 3D Printed Soft Actuators for Robotic Arms
As 3D printing and electronics continue to advance—along with robotics—soft actuators are becoming a great subject of study, as thesis student Hong Fai Lau outlines in the recently published ‘3D-Printed...
View our broad assortment of in house and third party products.