{"product_id":"22pcs-mixed-plastic-worm-crown-gears-robot-parts-2mm-4mm","title":"22pcs Mixed Plastic Toothed Wheels Worm Crown Gears Toy Robot Part 2MM - 4MM","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e22pcs Mixed Plastic Worm Crown Gears — Compact Drive Components for Robots \u0026amp; DIY Builds\u003c\/h2\u003e\n\u003cp\u003eWhen your robot project stalls because you can't find the right gear ratio, or your small-scale automation prototype needs a reliable motion transfer solution, sourcing the correct toothed wheels in one go is half the battle. This 22-piece mixed gear set is designed for makers, hobbyists, and educators who need a versatile assortment of plastic worm gears, crown gears, and toothed wheels ready to drop into their next build.\u003c\/p\u003e\n\u003cp\u003eThe set includes 22 individual plastic gear pieces spanning shaft bore diameters of 2 mm and 4 mm (approximately 0.08 in and 0.16 in). Gears are molded from engineering-grade plastic — typically ABS or POM — offering a balance of light weight and adequate rigidity for low-to-medium torque applications. Outer diameters across the assortment range from approximately 10 mm to 40 mm (0.39 in to 1.57 in), covering a practical spread of gear sizes in a single kit.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include DIY toy robot drive trains where worm gear self-locking is needed, RC model vehicle gearbox prototyping, and STEM education kits demonstrating gear ratio and mechanical advantage. The mixed assortment also suits small motorized gadgets, clock mechanisms, and desktop automation experiments where metal gears would add unnecessary weight.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e⚙️\u003c\/span\u003e Compatible with 2 mm and 4 mm motor shafts — fits common TT motors, N20 micro motors, and standard hobby DC motors used in robot and RC builds.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These Mixed Plastic Worm Crown Gears\u003c\/h2\u003e\n\u003cul class=\"hdiy-list\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\u003cstrong\u003e22-Piece Mixed Assortment\u003c\/strong\u003e — Includes worm gears, crown gears, and spur-style toothed wheels in one kit, reducing the need for multiple separate orders during prototyping.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cstrong\u003eDual Bore Sizes: 2 mm \u0026amp; 4 mm\u003c\/strong\u003e — Covers the two most common micro-motor shaft diameters, making the set immediately usable with TT motors, N20 motors, and similar hobby actuators.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🪶\u003c\/span\u003e\u003cstrong\u003eLightweight Engineering Plastic\u003c\/strong\u003e — Molded from ABS or POM-type plastic for low rotational inertia, reduced motor load, and quiet operation compared to metal equivalents.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cstrong\u003eWorm \u0026amp; Crown Gear Geometry\u003c\/strong\u003e — Worm gear pairs provide inherent self-locking behavior ideal for lift mechanisms and positioning stages; crown gears enable right-angle power transmission.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎓\u003c\/span\u003e\u003cstrong\u003eSTEM \u0026amp; Education Ready\u003c\/strong\u003e — Sized and priced for classroom kits, science fair projects, and maker workshops where students can explore gear ratios and mechanical advantage hands-on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cstrong\u003eMulti-Pack Options Available\u003c\/strong\u003e — Choose 1-set, 5-set, or 10-set packing quantities to stock your parts bin or fulfill small-batch production runs without overpaying per piece.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — Mixed Plastic Worm Crown Gear Set\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003ePiece Count per Set\u003c\/th\u003e\n\u003ctd\u003e22 pcs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGear Types Included\u003c\/th\u003e\n\u003ctd\u003eWorm gears, crown gears, toothed wheels\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eShaft Bore Diameters\u003c\/th\u003e\n\u003ctd\u003e2 mm \/ 4 mm (approx. 0.08 in \/ 0.16 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter Range\u003c\/th\u003e\n\u003ctd\u003eApprox. 10–40 mm (0.39–1.57 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eEngineering plastic (ABS \/ POM type)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eColor\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible Shaft Types\u003c\/th\u003e\n\u003ctd\u003eRound shaft, 2 mm and 4 mm diameter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRecommended Motor Types\u003c\/th\u003e\n\u003ctd\u003eTT motor, N20 micro motor, standard hobby DC motor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eApplication\u003c\/th\u003e\n\u003ctd\u003eRobot drive trains, RC models, STEM kits, small automation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePacking Quantity Options\u003c\/th\u003e\n\u003ctd\u003e1 set \/ 5 sets \/ 10 sets\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq\"\u003e\n\u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\u003cdetails\u003e\u003csummary\u003eWhich shaft diameter should I choose — 2 mm or 4 mm?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe set includes gears with both 2 mm and 4 mm bore sizes. Check your motor's output shaft diameter before assembling. N20 micro motors typically use 3 mm shafts with a 1 mm flat, but many hobby variants ship with 2 mm shafts. TT gear motors commonly use 3–4 mm D-shaft outputs. Measure your shaft with calipers before pressing a gear on.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eAre these gears strong enough for a robot that carries weight?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThese plastic gears are suited for low-to-medium torque applications such as small wheeled robots (under ~500 g payload), light conveyor mechanisms, and positioning stages. For heavy-load or continuous high-torque applications, metal gears are recommended. Worm gear pairs in this set provide self-locking, which helps hold position without motor power.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eWill these gears corrode or degrade over time?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eEngineering plastics like ABS and POM are inherently corrosion-resistant and will not rust. They perform well in typical indoor environments. Avoid prolonged exposure to strong solvents, UV radiation, or temperatures above approximately 80–100 °C (176–212 °F), which can cause warping or brittleness.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eAre these compatible with LEGO or other standard building systems?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThese gears use 2 mm and 4 mm round bore shafts and are not dimensionally compatible with LEGO Technic axles (which use a proprietary cross-axle profile). They are designed for use with standard round hobby motor shafts. If you need LEGO-compatible gears, please check our other listings.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eHow do I decide between the 1-set, 5-set, and 10-set options?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe 1-set option is ideal for a single project or to evaluate fit before committing. The 5-set and 10-set packs offer a lower per-piece cost and are suited for classroom kits, maker workshops, or small-batch production where you need spare gears on hand. All packs contain the same 22-piece mixed assortment per set.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eCan I use these gears with 3D-printed parts?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. These gears work well alongside 3D-printed brackets, motor mounts, and gear housings. Because the bore diameters are standard (2 mm and 4 mm), you can design or download shaft holders and gear carriers in CAD software and print them in PLA or PETG for a secure fit.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eWhat is the gear ratio I can achieve with the worm gear pairs?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eGear ratio depends on the number of teeth on the worm wheel (crown gear). Typical worm gear sets in this size range achieve ratios from approximately 10:1 to 40:1 per stage, providing significant speed reduction and torque multiplication. Exact tooth counts vary by piece; inspect each gear visually or count teeth to determine the specific ratio for your application.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your packing quantity above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Which shaft diameter should I choose — 2 mm or 4 mm?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The set includes gears with both 2 mm and 4 mm bore sizes. Check your motor's output shaft diameter before assembling. N20 micro motors typically use 2–3 mm shafts; TT gear motors commonly use 3–4 mm D-shaft outputs. Measure your shaft with calipers before pressing a gear on.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these gears strong enough for a robot that carries weight?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These plastic gears are suited for low-to-medium torque applications such as small wheeled robots (under ~500 g payload), light conveyor mechanisms, and positioning stages. For heavy-load or continuous high-torque applications, metal gears are recommended.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will these gears corrode or degrade over time?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Engineering plastics like ABS and POM are inherently corrosion-resistant and will not rust. Avoid prolonged exposure to strong solvents, UV radiation, or temperatures above approximately 80–100 °C (176–212 °F).\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these compatible with LEGO or other standard building systems?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These gears use 2 mm and 4 mm round bore shafts and are not dimensionally compatible with LEGO Technic axles. They are designed for use with standard round hobby motor shafts.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I decide between the 1-set, 5-set, and 10-set options?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The 1-set option is ideal for a single project or to evaluate fit. The 5-set and 10-set packs offer a lower per-piece cost and are suited for classroom kits, maker workshops, or small-batch production. All packs contain the same 22-piece mixed assortment per set.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these gears with 3D-printed parts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. These gears work well alongside 3D-printed brackets, motor mounts, and gear housings. The standard 2 mm and 4 mm bore diameters allow you to design or download shaft holders and gear carriers in CAD software and print them in PLA or PETG.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What gear ratio can I achieve with the worm gear pairs?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Typical worm gear sets in this size range achieve ratios from approximately 10:1 to 40:1 per stage. Exact tooth counts vary by piece; count teeth to determine the specific ratio for your application.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"1set","offer_id":52443688141074,"sku":"LFLKKMX1497x1","price":9.49,"currency_code":"USD","in_stock":true},{"title":"5set","offer_id":52443688173842,"sku":"LFLKKMX1497x5","price":30.44,"currency_code":"USD","in_stock":true},{"title":"10set","offer_id":52443688206610,"sku":"LFLKKMX1497x10","price":58.89,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Main-03_c2f1991e-8b6b-4c8a-bd22-0802c52d71fd.jpg?v=1783951386","url":"https:\/\/homediyer.com\/products\/22pcs-mixed-plastic-worm-crown-gears-robot-parts-2mm-4mm","provider":"HomeDIYer","version":"1.0","type":"link"}