The tolerances of high-precision gears are generally difficult to describe with the "good" described by the American Plastics Industry Association (SPI). But today most molding specialists use the latest molding machines with machining control units to control the precision of molding temperature, injection pressure, and other variables to form precision gears on a complex window. Some gearmaking specialists use more advanced methods in which temperature and pressure sensors are placed in the cavity to improve molding consistency and repeatability.

Precision gear manufacturers also need to use professional testing equipment, such as used to control the quality of the teeth of the double-side scrolling detector, to assess the gear tooth surface and other features of the computer control detector. But having the right device is just the beginning. Molds who are trying to enter the precision gear industry must also adjust their molding environment to ensure that they produce gears that are as consistent as possible during each injection molding. Since the production of precision gears, the behavior of craftsmen is often the decisive factor, so they must focus on the training of employees and the operation of the control process.

Since the size of the gears is susceptible to seasonal temperature changes, even opening the door allows the temperature fluctuations caused by a forklift to affect the dimensional accuracy of the gears, so the molding manufacturer needs to strictly control the environmental conditions of the molding area. Other factors to consider include a stable power supply, a suitable drying device that controls the temperature and humidity of the polymer, and a cooling unit with a constant air flow. In some cases, the use of automation technology, through a repeated action, the gear from the forming position to remove and placed in the transmission unit, to achieve the same cooling mode.