1. gear
A mechanical transmission of the gear is very widely used, almost all gear in the machine tool gearing. Servo feed system in NC machine tool using gear has two purposes. Is a high-torque servo motor speed (such as DC and stepper motors, AC servo motors) of implementation of the outputs change to low speed large torque input; the other is to make the moment of inertia of the ball screw and countertops less proprietary share of the system. In addition, for open-loop systems can also ensure the precision required.
In order to minimize the backlash effect on Machining accuracy of NC machine tools, often in structural measures to reduce or eliminate the empty distance error of gears. If dual-gear teeth the wrong method, the use of eccentric sleeve to adjust gear centre distance or axial shim adjustments to eliminate gear backlash.
Compared with synchronous toothed belts, used in the transmission chain of numerical control machine tool feed gear device and better low-frequency oscillation, therefore reducing mechanism used to configure dynamic dampers to improve performance.
2. synchronous toothed belts
Synchronous toothed belts transmission is a new type of belt. He used the pulley and toothed belt toothed gear teeth meshing in turn passing movement and motivation, thus also the advantages of belt drive and chain drive, gear drive, and no relative sliding average drive more accurate, high drive precision and toothed belt high strength, thickness, small size, light weight, it can be used for high speed transmission. Special tensioning of the belts do not need, therefore the load acting on the shaft, SKF bearings small, high transmission efficiency, is now widely used in NC machine tool. Main parameters of synchronous toothed belts and specifications are as follows:
1) pitch pitch p for two adjacent teeth on the section line a distance of. Due to the strong floor length while you work the same, so strong central line was provided as a toothed belt pitch line (neutral), and a perimeter of a line l as the nominal length of toothed belt.
2) modulus modulus is defined as m=p/π, making size a main basis for calculation of toothed belt.
3) other parameters other parameters and dimensions of the toothed belt and involute teeth are basically the same. Toothed belt article involute gear tooth profile equation of different, because the toothed belt pitch line on the strength, rather than gear in high school.
　　Toothed belt tagging method is: module * width * number of teeth, namely m*b*z.



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