Difficulties of High Precision

TOKYO, Japan - April 7, 2024 - PRLog -- Difficulties for High Precision

While people have met various of difficulties on the way to embrace perfect accuracy and highest precision,

l Complex structure and many parts in motion

High accuracy is obtained through complicated reduction mechanism, even 200 parts involved in! This puts forward highest entrance for manufacturing and precision machining techniques.

l Unsteady and shorter retention

Some gearboxes have good precision, very low backlash at the beginning, when time goes by, the accuracy level also degrade quickly. Not all elements are participating in motion.

When excessive torque is applied while the gear is in motion, the teeth may not engage properly, cause non-eccentric motion, result in shortened life and a fatigue failure, teeth wear excessively. Or some parts may experience plastic deformation, some part buckles to cause early failure of gear.

Vibration can occur when the driving frequency of the servo system including the gearbox is at or close to the resonant frequency of the system.

When time goes by, visible tooth crack, rim crack, pitting, interface wear, wave generator wear, diaphragm crack, red cross section crack etc appear physically.

Some gearboxes perform tooth profile modification, The purpose is to try to ensure smooth meshing, even though there may be small manufacturing errors, and the teeth may deflect under load. It is recognized that under zero or light load the teeth will not be exactly conjugate.

l Lubrication and Viscous friction

Traditionally, it is extremely important to properly grease the component. There are two types of lubrication, oil and grease lubrication, You must know clearly when to replace grease, the wear characteristics of the gear are strongly influenced by the condition of grease lubrication. The condition of the grease is affected by the ambient temperature. various temperatures allow different input rotations. You will need to avoid mixing different kinds of grease/also precaution for special environments and pay attention to grease leakage.

Viscous friction occurs due to lubricant action. This type of friction results from the churning and mixing of lubricant-greatly depends on rpm speed.

At low rotation, this friction may be negligible, once the gearbox starts to turn, viscous friction increases significantly as rpm speeds up. For example, at an input of 200rpm, viscous friction is the largest contributor of overall friction.

l Higher cost

Some gearboxes manufacturer offer different design or solution such as software to assist to obtain higher precision, such as using special processing machinery, latest machine tools, techniques, or using helical gear, bevel gear, combinations to replace spur gear, this structure cause higher cost on design and material, production.

Higher precision will be created through rather more expensive machinery, price will be higher,

https://www.youtube.com/watch?v=-TVuPzhUZnc