There are many types of rotary tables in the market, for instance, the hypoid gear rotary table, all of which essentially work positioning devices widely used in metalworking applications. It allows work to be cut or drilled at identical intervals around a fixed axis (normally horizontal or vertical).
Some of the key advantages of a rotary table include the repeatability, short time of indexing, flexible indexing positions, as well as the tolerability of exceptionally high axial and radial torques during rotation and stopping.
Systems based on rotary tables are generally very durable, and will not require a repair until a longer period of time. Depending on the applications, the rotary table may be complemented with an internal or external clamp. In this article, we’ll specifically address the hypoid gear rotary table.
A hypoid gear rotary table is a kind of rotary table with the hypoid gears and right angle gearbox integrated into it. This type of rotary table is characterized by high gear ratio, high torque, high precision, high IP grade, and low wear. It employs a sliding mechanism to rotate, and the transmission precision can reach as high as 30 arc seconds with transmission efficiency up to 96%. A hypoid gear rotary table also has the gear geometric tolerance of ≤ 0.002mm.
The high IP grade allows hypoid gear rotary tables to work in environments with high humidity, and to be both waterproof and dustproof. The housing of the hypoid gear rotary table is also typically made of robust alloy steel with a large modulus root design, making it one of the most rigid rotary tables for rotation of large inertia load. Hypoid gear rotary table is also known for its long lifespan, having been made with high rigidity and high density gear materials that can reach up to 30,000 hours of precision life.
Hypoid gear rotary tables are also referred to as the high torque rotary stage, hypoid follow rotary stage, right angle hypoid gearbox, etc. This type of rotary tables is widely used in several automation-emphasized industries, namely transmission system, CNC and robot arm fields. Hypoid gear rotary tables can be installed horizontally, suspended or side installation. To elaborate better, we’ll talk about what exact hypoid gears are in the following section.
In this section, we’ll illustrate what exactly hypoid gears are and where they are used complementing the rotary table. A hypoid gear is essentially a type of spiral bevel gear with an axis not intersecting with the meshing gear axis. The shape of a hypoid gear is a revolved hyperboloid while the shape of a spiral bevel gear is usually conical. The reason that we mention this here is that they are usually mistaken as interchangeable terms.
In a hypoid gear, the pinion is positioned off-axis to the ring gear, which enables the pinion to be greater in diameter and to have more contact area. For the design of hypoid gear, the pinion and the gear are virtually always positioned opposite of each other, and the spiral angle of the gear is usually smaller than that of the pinion. It’s also worth noting that the hypoid pinion is greater in diameter than that of an equivalent bevel pinion.
Equipment that incorporate hypoid gears, namely rotary tables, are typically used in power transmission products which are more efficient than the traditional worm gearing. Hypoid gearings are significantly stronger because the load is conveyed through multiple teeth at the same time. Conversely, bevel gears are loaded through a single tooth one at a time. With proper lubricants, multiple contacts of hypoid gearing can be made silent as well. Specialized gear oils are also imperative for hypoid gears due to the fact that the sliding motion of the gear requires proper lubrication under extreme pressure among the teeth.
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