The lead of the ball screw is also called the pitch, that is, the distance of linear movement of the nut per one revolution of the screw. Common leads are 1, 2, 4, 6, 8, 10, 16, 20, 25, 32, 40, small and medium lead spot Products are generally only 5 and 10, and large leads generally include 1616, 2020, 2525, 3232, and 4040 (the first two digits of the 4-digit refer to the diameter, and the last two digits of the guide course). The specifications of Lanbing are produced on order. The lead is related to the linear speed. When the input speed is constant, the larger the lead, the faster the speed. Lanbing recommends: Try to choose 5 and 10 for the lead.
The selection of the lead is related to the required movement speed, system, etc. It is usually selected among: 4, 5, 6, 8, 10, 12, and 20. The size is larger, and the lead can generally be larger (mainly considering the load-bearing tooth thick). When the speed is satisfied, generally choose a smaller lead (to improve the control accuracy); for the occasions requiring high speed, the lead can exceed 20, for the ground screw, the lead can generally be approximately equal to the nominal diameter (Limited by the grinding helix angle), such as 32 (3232), 40 (4040), etc., of course, it can also be larger (non-grinding, but rarely considered). The larger the lead, the larger the rotation component under the same conditions, the greater the period error, and the faster the speed. Therefore, in general high-speed occasions, flexibility is required, and some accuracy requirements are abandoned, and the significance of the clearance requirements becomes smaller (the lead accuracy deviation increases). Therefore, the large-lead screw is generally a single nut.
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