What Are the Types of Rotary Table?
Direct Drive Rotary Table is the latest type of rotary table designed for the continuous operation that is many times more accurate and agile than traditional face-driven rotary table or rack and pinion rotary table. The driving mechanism is such that there is no need to balance the system and all its components while it is in use. This makes this type of rotary table ideal for manufacturing automation and other industries. In addition, the benefits of this rotary table are speedy and constant movement that make for less fatigue and hence, high output.
In a traditional rotary table assembly, there is a component that drives the pins while the rest of the assembly is free-swinger and is subjected to creep, heat and other forms of shock. There is a need to apply heat to drive the pins and this leads to a phenomenon called ‘oxidation’ which literally means burning up of the assembly. Due to the nature of the rotary table, there is a need for constant lubrication and the conventional ways of lubrication such as water-based oils and grease compounds lead to oxidation of the parts in contact with the rotary gearbox. Rotary gearboxes and their parts get damaged due to this process and it also causes a lot of friction that causes even further wear and tear.
High-speed industrial production requires that the components be made up of materials that work at very high speeds. Rotary tables that run on electric motors are ideal for these kinds of productions where high-speed cogs and worm gears are needed. To reduce wear and tear and maintain high-speed performance, it is important to have a gearbox that can function at these high speeds. The right kind of gearbox is needed and one of the varieties is the direct drive rotary table assembly.
These are the most common types of rotary table and they are usually found on industrial presses, sewing machines and food processing lines. Rotary shafts that operate on a direct drive system are usually made from either steel or aluminum and they contain a gearbox and clutch assembly. The gearbox is powered by an electric motor, while the clutch assembly, which contains bearings, is powered by a counterweight. A worm gear and a pinion are contained within the main body of the rotary table.
In a normal Direct Drive Rotary Table assembly, the shafts move parallel to each other in a horizontal manner and hence there is no need for any type of ball bearing devices. However, there are some high-speed equipment that do require ball bearings so that the gearbox can work efficiently and as per the requirements. The shafts are fixed in a vertical direction and they move in a horizontal direction as well. It is usually found that the gearbox and clutch assembly experiences a high level of friction so that it tends to get stressed and over-worked. Further, there is also a high-speed pulley system that works on the shafts and gears and this also tends to get stressed and over-worked.
Low Runout: A problem that comes up with Direct Drive Rotary Table machinery is low runout or messy shifts. The gears tend to get stuck on the shafts. The problem of low turnout is generally caused due to improper or poorly designed gear-wear components. A low turnout of the rotary table occurs when the gearbox does not operate as per the required speed and as such the teeth grind against each other. This causes clogging of the gear-box and thus it causes a high amount of wear and tear of the bearings.