The Duracon may be cheaper, but it is recommended that you decide between these materials after taking the strength and water absorption rate into consideration. The most plastic gears that are in use nowadays are made from either Duracon with milky white color (polyacetal resin) or MC nylon with blue color (polyamide resin). KHK covers two types of plastic worm gear, PG (MC901-made worm gear) and DG (polyacetal-made worm gear) to respond to various customer’s requests. KHK offers MC nylon-made PM (plastic miter gear), so-called engineering plastic, PB (plastic bevel gear), polyacetal-made DM (miter gear made by injection molding), and DB (bevel gear made by injection molding).
#3d clock gears series
Using PR as the base, end surface work is performed for PRF type which enables connection with several racks.įor DRF series, polyacetal (equivalent to POM and Duracon) has realized the water absorption resistance better than MC nylon, reducing the change of rack length caused by water absorption.ĭRF-based DRFD and DRFK series have mounting holes on the rack to be more user-friendly.īeing manufactured by injection molding, DR has a unique and flexible character, and comes in handy when using rack and pinion in a curved place. MC nylon (reinforced plastic) is used for standard type PR. Plastic Gear made by 3D Printer Plastic gear rack : We also provide DS as the low-strength plastic gears realizing the cost reduction through injection molding. In addition, MC nylon which is improved in strength and thermal characteristics is used for standard type PS, and we also offer PSA as a version without boss. NSU and PU series use nylon teeth and metal core to facilitate hole machining and key groove machining which are necessary to fasten gear and axis, and to strengthen fastening parts of gears and axes where excessive loads are applied to. We offer you various types of plastic spur gears according to usage and necessary strength.ĭSL series allow you to fasten gears and axes easily. Plastic gears manufactured by KHK Plastic spur gears : In recent years, even a material called super engineer plastic has been introduced while making a contribution to the performance improvement of the plastic gear. The plastic gear is new compare to the steel gear, and it originates from the introduction of engineer plastic that is abbreviated to En-pla. Mating worm : SW, SUW Click Here to Select Worm Gears Introduction On the other hand, the tooth surface strength calculation is based on the manufacturer of MC Nylon and needs no consideration. The degree of dimensional changes that occur with plastic gears depend on the ability to resist temperature change, moisture absorption rate and resistance to chemicals.Īs far as the applications of plastic gears, they are used in varying industries such as food production machines, consumer electronics, chemical, toy, and medical equipment industries.Īt KHK, the bending strength of plastic gears are computed with the Lewis formula. are some of the points requiring caution. On the other hand, low strength, tendency to hold heat, large dimensional change including backlash compared to metal, etc. The positive characteristics of plastic gears include being lightweight, non-rusting, quiet, injection molding enabling low cost and large production, and able to operate without lubrication by mating with metal gears. KHK’s fused gears are designed in such a way that the holding strength of the fused surface is stronger than the tooth strength. If it is not possible to screw together, two parts are fused together and made into fused gears. In these cases, the teeth portion and the hub portion are attached together with screws. When there is a large temperature fluctuation in the application environment, when the diameter is large or when there is load on its keyway, metal hub made of S45C or stainless steel may sometimes be used. Materials used in plastic gears are, in general, engineering plastics such as polyacetal (POM) and MC Nylon which is essentially polyamid resin. Plastic Gears – Lightweight and Rust-proof
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