(worm gear tooth) towards. Approach would be made small or zero and the angle of recess larg. Modifying the design to give predominantly recess action i.e.
![]() A range of backlash values can be obtained by moving the worm axially.Duplex worm wheels made of aluminum bronze, excellent in wear-resistance. MechGuru's Worm Gear Box Design Calculator.Duplex worms with a shaft, excellent in accuracy and strength. Worm Gear Box Design Calculator. Ready-to-use finished products from the J Series are also available.Rust-resistant worms made of stainless steel suitable for mating with KDS or KPG worm wheels. Ready-to-use finished products from the J Series, are also available.Economical, commonly used worms that have broad utility. Allows compact design.Reasonably priced ground worms. Wide selection is available for this item.Made of aluminum bronze, have excellent wear-resistance. Allows compact design due to having small reference diameters.Made of aluminum bronze, have excellent wear-resistance. Suitable for use in food machinery, and can be used without lubricant.NOTE 1: The material of cast hubs for KAGF and KAG worm wheels is FC200(Cast Iron). Available with a large selection of modules and number of teeth.Fine pitch worm wheels made of polyacetal, a stable plastic material.Light weight and strong MC Nylon worm wheels. Interchangeable with CG Worm Wheels, and enhances strength.Economical, commonly used worm wheels that have broad utility. ![]() Worm Gear Design Calculation Series Of WormNOTE 3: Allowable bending stress of KDG worm wheel is the value we estimated.The Maximum Allowable Sliding Speed Due to HeatThe maximum allowable sliding speed for each series of worm wheels is given pn the right.Select the appropriate part by calculating the sliding speed.3. The units for the rotational speed (rpm) and the stress (kgf/mm2) are adjusted to the units needed in the formula. Less than 2 starts per hourNOTE 2: The gear strength formula is based on JGMA (Japanese Gear Manufacturer's Association) specifications and "MC Nylon Technical Data" by Nippon Polypenco Limited. It is also important to read all applicable "CAUTION" notes shown below before the final selection.Use of catalog numbers when ordering will simplify and expedite the processing of your order.Calculation Assumptions for Surface DurabilityFormula of worm gears strength (JGMA405-01)Lubricant for gears with proper viscosity and with anti-pressure additivesStarting torque less than 200% of rated torque. If there are questions or you require clarifications, please contact our technical department.1. Lead errors are measured over one full revolution.Precision Grades of Worms (KHK W 001) (Unit: μm)In order to use KHK stock worms and worm wheels safely, carefully read the Application Hints before proceeding. The table below indicates the tolerance ranges for our products.KHK established allowable profile and lead errors of worms with precision grades 1 to 4, by using the JIS Standard as reference. (For worm shafts, it is ground portion of the shaft.) Therefore, use the bore or shaft for locating the center. (Fig.1) The reference datum for gear cutting or grinding is the bore. If you are reboring, it is important to pay special attention to locating the center in order to avoid runout. In the case FC material is used, it should be lower by 10% or more. When the keyway is processed, it should be 50% to 60%. As a guide, the maximum machined bore diameter should be within 60% to 70% of the hub diameter (or root diameter). To open up the bore to its maximum, calculate the bore size so that the tooth strength is weaker than the strength of the remaining material.For machining the maximum bore diameter, it should be designed so that the thickness between hub diameter (or root diameter) to bore diameter has more strength than the gear strength. In case you find air bubbles inside when performing secondary operations, and if the bubbles are found to be troublesome, please contact us.
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