{"id":1914,"date":"2026-04-09T05:32:25","date_gmt":"2026-04-09T05:32:25","guid":{"rendered":"https:\/\/wormwheelgear.top\/?p=1914"},"modified":"2026-04-09T05:32:25","modified_gmt":"2026-04-09T05:32:25","slug":"how-to-specify-a-worm-gear-the-complete-engineers-checklist","status":"publish","type":"post","link":"https:\/\/wormwheelgear.top\/nl\/how-to-specify-a-worm-gear-the-complete-engineers-checklist\/","title":{"rendered":"How to Specify a Worm Gear \u2014 The Complete Engineer’s Checklist"},"content":{"rendered":"
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Kennisreeks \u00b7 Specificaties wormwieloverbrenging<\/p>\n

How to Specify<\/span> a Worm Gear \u2014 The Complete Engineer’s Checklist<\/h1>\n

The 10 parameters you must define before a worm gear specification is complete \u2014 in the correct order, with the calculation behind each one \u2014 plus a printable checklist that produces a confirmed quotation within one working day.<\/p>\n

10-Parameter Framework<\/span>
\nWorked Example<\/span>
\nPrintable Checklist<\/span><\/div>\n<\/div>\n
\n
<\/div>\n

\"Wormwieloverbrenging<\/p>\n<\/div>\n<\/section>\n

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\u2699 Korea Ever-Power Worm Gear Co., Ltd\ud83d\udccd Ansan-si, Gyeonggi-do, Korea\ud83d\udce7 sales@wormwheelgear.top<\/div>\n<\/div>\n
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Why “I Need a Worm Gear” Is Never Enough<\/h2>\n

Every worm gear enquiry that arrives at Korea Ever-Power is followed by the same set of questions. Not because the answers are difficult \u2014 because most enquiries omit them. Missing parameters delay a quotation by one round-trip per gap. A specification with all 10 parameters confirmed receives a quotation within one working day. One with three parameters may require a week of clarification exchanges before the specification is solid enough to price \u2014 and that week is often on the critical path of a machine development program.<\/p>\n

The 10 parameters are not arbitrary. They follow a logical sequence: each one constrains the options available for the next. Start with ratio and you can determine start count. Start count determines efficiency, which affects the torque budget. Torque determines module. Module and ratio together determine centre distance. Centre distance is what the housing must accommodate. Everything flows from the first parameter: the required gear ratio. Getting the order right prevents the most common specification error \u2014 selecting a module and then discovering it conflicts with the available housing space.<\/p>\n

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The 10 parameters in order:<\/p>\n

    \n
  1. Gear ratio i<\/li>\n
  2. Start count z1<\/li>\n
  3. Module m<\/li>\n
  4. Output torque T2<\/li>\n
  5. Centre distance a<\/li>\n
  6. Bore and shaft fit<\/li>\n
  7. Keyway<\/li>\n
  8. Material and duty class<\/li>\n
  9. Precisieklasse<\/li>\n
  10. Documentation package<\/li>\n<\/ol>\n<\/div>\n<\/div>\n<\/div>\n
    \n

    The 10 Specification Parameters \u2014 What Each Requires and Why<\/h2>\n
    \n
    \n
    01<\/span>
    \nGear Ratio i = n\u2081 \u00f7 n\u2082<\/span><\/div>\n

    Start with your motor speed (n\u2081) and the required output shaft speed (n\u2082). The ratio i = n\u2081 \u00f7 n\u2082 is the primary design input \u2014 everything else follows from it. A 4-pole motor at 1450 RPM driving a shaft that must turn at 29 RPM requires i = 50:1. Always calculate the exact required ratio first, then select the nearest standard catalog ratio or specify a custom ratio. Standard ratios (10, 15, 20, 25, 30, 40, 50, 60, 80, 100:1) may not match your requirement exactly. Non-standard ratios are available at Level 3 semi-custom specification without new tooling. The gear ratio also determines whether self-locking is achievable: at high ratios (\u2265 30:1 with single-start worm), self-locking is typically achievable; at low ratios, it requires verification.<\/p>\n<\/div>\n<\/div>\n

    \n
    \n
    02<\/span>
    \nStart Count z1 (1, 2, or 4)<\/span><\/div>\n

    The start count determines two properties simultaneously: self-locking capability and efficiency. Single-start (z1=1): lead angle shallow \u2192 self-locking at most ratios \u2192 efficiency 50\u201375%. Double-start (z1=2): efficiency improves to 72\u201382% \u2192 self-locking marginal. Four-start (z1=4): efficiency 83\u201390% \u2192 self-locking not achievable. Specify z1=1 whenever load-holding (safety self-locking) is required \u2014 for inclined conveyors, hoists, and cobot joints. Verify self-locking at maximum operating temperature, not ambient: friction coefficient drops with temperature, potentially eliminating self-locking behaviour in a drive that self-locks at 20\u00b0C but not at 70\u00b0C housing temperature.<\/p>\n<\/div>\n<\/div>\n

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    \n
    03<\/span>
    \nModule m (from torque, not ratio)<\/span><\/div>\n

    Module is selected from the required output torque, not from the ratio. The torque-module relationship for tin bronze wheel: T\u2082_rated \u2248 0.9 \u00d7 m\u00b3 \u00d7 z\u2082 \u00d7 120 MPa (approximate for ZCuSn10Pb1 at moderate speed). For a required T\u2082 of 300 Nm at 50:1 (z\u2082=50): m\u00b3 \u2265 300 \/ (0.9 \u00d7 50 \u00d7 0.12) \u2192 m\u00b3 \u2265 55.6 \u2192 m \u2265 3.82 \u2192 select M4. Standard modules: M1, 1.25, 1.5, 2, 2.5, 3, 4, 5, 6, 8, 10. Non-standard modules (M3.5, M4.5, M7) require Level 4 custom tooling. Always select one standard module step above the minimum calculated value to provide service factor margin.<\/p>\n<\/div>\n<\/div>\n

    \n
    \n
    04<\/span>
    \nOutput Torque T\u2082 (load \u00d7 service factor)<\/span><\/div>\n

    Calculated torque from the application: T\u2082 = F \u00d7 r for linear mechanisms (F = load force, r = moment arm), or T\u2082 = P\/\u03c9 for rotary mechanisms. Apply a service factor: 1.0\u20131.25 for smooth constant load (fans, pumps); 1.5 for moderate shock (conveyors starting under load); 2.0\u20132.5 for heavy shock (material handling with potential jams, start-stop high-cycle). The design torque T\u2082_design = T\u2082_load \u00d7 SF. Motor torque at output shaft \u2260 design torque: T\u2082_motor = T_motor \u00d7 i \u00d7 \u03b7 \u2014 the efficiency reduction means the motor must supply more input torque than the load torque divided by ratio.<\/p>\n<\/div>\n<\/div>\n

    \n
    \n
    05<\/span>
    \nCentre Distance a (derived, not chosen)<\/span><\/div>\n

    Once module, start count, and tooth count are fixed, centre distance is determined: a = m(q + z\u2082)\/2 where q is the diameter quotient (typically 8\u201316, often chosen as q=12 or q=10). For M4, q=12, z\u2082=50: a = 4(12+50)\/2 = 124 mm. Centre distance is not a free variable. The machine housing must accommodate the calculated centre distance within the tolerance required for the precision class (typically \u00b10.10 mm for standard, \u00b10.05 mm for precision drives). Housing design or selection follows from centre distance \u2014 do not design the housing first and fit the gear set to it.<\/p>\n<\/div>\n<\/div>\n

    \n
    \n
    06<\/span>
    \nBore Diameter and Shaft Fit<\/span><\/div>\n

    The bore is manufactured to H7 tolerance (standard hole basis). Shaft fit type: H7\/k6 \u2014 transition fit, removable for maintenance; H7\/n6 \u2014 light interference, standard medium-duty permanent assembly; H7\/p6 \u2014 medium interference, heavy-duty shock applications (requires hydraulic press or heating to assemble). Non-standard bore diameters (any value, not just catalog steps) are available as Level 2 custom with 2\u20134 week lead time and no tooling cost. Specify bore diameter to 0.1 mm and fit type explicitly. Duplex worm shafts (adjustable backlash) require a different shaft fit \u2014 H7\/g6 clearance fit to allow axial adjustment.<\/p>\n<\/div>\n<\/div>\n

    \n
    \n
    07<\/span>
    \nKeyway Dimensions<\/span><\/div>\n

    Keyway dimensions follow DIN 6885A as a function of bore diameter. A 30 mm bore: 8\u00d77 mm key (8 wide \u00d7 7 high). A 50 mm bore: 14\u00d79 mm key. Specify: (1) keyway standard (DIN 6885A metric default), (2) keyway width tolerance (JS9 for normal clearance; P9 for interference key fit), (3) whether a set screw hole is required. If no keyway is required, state this explicitly \u2014 without instruction, a keyway will be machined on all bores above 10 mm as standard. If two keyways are needed (90\u00b0 apart for balancing or redundancy), this must be specified at order placement.<\/p>\n<\/div>\n<\/div>\n

    \n
    \n
    08<\/span>
    \nMaterial and Duty Class<\/span><\/div>\n

    Shaft material governs hardness and hardenability; wheel material governs anti-scuffing and strength. These are a pairing \u2014 the correct combination depends on duty class and environment. D1 light: C45 induction-hardened + ZCuSn10Pb1. D2 medium: 40Cr through-hardened + ZCuSn10Pb1. D3 heavy: SCM415 carburized + ZCuAl10Fe3. Food\/marine: SS316 + SS316 or SS316 + ZCuSn10Pb1. Stating only the shaft grade (‘I need a 40Cr shaft’) is insufficient \u2014 the wheel alloy must be specified too. A 40Cr shaft against ZCuAl10Fe3 wheel has inadequate hardness differential in some conditions; see the material selection guide<\/a> for pairing rules.<\/p>\n<\/div>\n<\/div>\n

    \n
    \n
    09<\/span>
    \nPrecision Class (DIN 5\u201312)<\/span><\/div>\n

    DIN precision class specifies the allowable tolerance on lead deviation, profile deviation, pitch error, and tooth thickness. DIN 12: commercial (hobbed only, general industrial); DIN 9\u201310: standard industrial (hobbed + possible touch-grind); DIN 7\u20138: precision (thread-ground); DIN 5\u20136: high precision (ground and lapped, for robotic and positioning drives). Each step tighter roughly doubles the manufacturing cost. Specify the minimum class your application requires. Over-specifying DIN 6 for a warehouse conveyor drive adds cost with no operational benefit; under-specifying DIN 9 for an indexing robot produces position errors. State the required precision class alongside the application type so Korea Ever-Power can confirm the specification is appropriate.<\/p>\n<\/div>\n<\/div>\n

    \n
    \n
    10<\/span>
    \nDocumentation Package<\/span><\/div>\n

    Documentation level must match your quality system requirement. Standard supply: material certificate (heat number traceable) + CMM dimensional inspection report. Food \/ HACCP: add surface roughness report (Ra measurement) + NSF H1 lubricant compatibility confirmation + HACCP zone statement. Marine \/ offshore: add 500h ASTM B117 salt spray test certificate. Medical device (ISO 13485): add ISO 10993-1 biocompatibility reference + heat treatment record + mill test certificate. Automotive OEM (PPAP): specify PPAP Level 1, 2, or 3. Documentation requirements cannot always be fulfilled retrospectively from a shipped order \u2014 state them at order placement, and Korea Ever-Power will confirm availability before accepting the order.<\/p>\n<\/div>\n<\/div>\n

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    Worked Example: From Motor + Load to Complete Specification<\/h2>\n

    Application: inclined belt conveyor, warehouse distribution centre. Motor 4-pole 1450 RPM, 3 kW. Drive drum diameter 200 mm (required output: 38.2 RPM). Incline 15\u00b0, load mass 600 kg. Standard industrial indoor environment.<\/p>\n

    \n
    Parameter Build-Up<\/div>\n
    \u2460 Ratio<\/span>
    \n1450 \u00f7 38.2 = 37.96 \u2192 standard 40:1<\/strong> (output 36.25 RPM \u2014 acceptable \u00b15%)<\/span><\/div>\n
    \u2461 Start count<\/span>
    \nIncline requires load-holding \u2192 z1 = 1<\/strong> (verify self-locking at 65\u00b0C housing temp)<\/span><\/div>\n
    \u2462 Torque<\/span>
    \nF = 600 \u00d7 9.81 \u00d7 sin15\u00b0 + 0.15 \u00d7 600 \u00d7 9.81 \u00d7 cos15\u00b0 \u2248 2,368 N; T2 = 2,368 \u00d7 0.10 = 237 Nm; SF=1.5 \u2192 T_design = 355 Nm<\/strong><\/span><\/div>\n
    \u2463 Module<\/span>
    \nm\u00b3 \u2265 355 \/ (0.9 \u00d7 40 \u00d7 0.12) = 82.2 \u2192 m \u2265 4.34 \u2192 Module M5<\/strong> (m\u00b3=125)<\/span><\/div>\n
    \u2464 Centre distance<\/span>
    \na = 5(12+40)\/2 = 130 mm<\/strong><\/span><\/div>\n
    \u2465 Bore<\/span>
    \nShaft diameter 35 mm, medium duty, no shock \u2192 \u230035 mm H7\/n6<\/strong><\/span><\/div>\n
    \u2466 Keyway<\/span>
    \n35 mm bore \u2192 10\u00d78 mm DIN 6885A<\/strong><\/span><\/div>\n
    \u2467 Material<\/span>
    \nD2 medium, no shock \u2192 40Cr shaft (50\u201356 HRC) + ZCuSn10Pb1 wheel<\/strong><\/span><\/div>\n
    \u2468 Precision<\/span>
    \nWarehouse conveyor \u2192 DIN 8<\/strong><\/span><\/div>\n
    \u2469 Documentation<\/span>
    \nStandard industrial \u2192 Material certificate + CMM report<\/strong><\/span><\/div>\n<\/div>\n
    \n

    From Specification to Finished Gear Set<\/h2>\n\n\n\n\n
    \"\"<\/td>\n\"\"<\/td>\n\"\"<\/td>\n<\/tr>\n
    \"\"<\/td>\n\"\"<\/td>\n\"\"<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    Printable Specification Checklist<\/h2>\n
    \n
    Korea Ever-Power \u2014 Worm Gear Enquiry Checklist (send to sales@wormwheelgear.top)<\/div>\n
    \n
    \nMotor speed (RPM)<\/span><\/div>\n
    \nRequired output speed (RPM)<\/span><\/div>\n
    \nGear ratio i (calculated)<\/span><\/div>\n
    \nStart count z1 (self-locking needed?)<\/span><\/div>\n
    \nRequired output torque (Nm)<\/span><\/div>\n
    \nService factor applied<\/span><\/div>\n
    \nDesign torque T_design (Nm)<\/span><\/div>\n
    \nModule m \u2014 or confirm from torque<\/span><\/div>\n
    \nCentre distance a (mm)<\/span><\/div>\n
    \nBoringdiameter (mm)<\/span><\/div>\n
    \nShaft fit type (H7\/k6 \/ n6 \/ p6)<\/span><\/div>\n
    \nKeyway (DIN 6885A width\u00d7height, or none)<\/span><\/div>\n
    \nWorm shaft material + hardness<\/span><\/div>\n
    \nWorm wheel alloy<\/span><\/div>\n
    \nDuty class D1\u2013D4<\/span><\/div>\n
    \nPrecision class (DIN 5\u201312)<\/span><\/div>\n
    \nIP rating required<\/span><\/div>\n
    \nOperating temperature range (\u00b0C)<\/span><\/div>\n
    \nSpecial environment<\/span><\/div>\n
    \nDocumentation standard required<\/span><\/div>\n<\/div>\n<\/div>\n<\/div>\n
    \n
    \n
    Korea Ever-Power<\/span><\/p>\n

    Products for Every Specification Level<\/h2>\n<\/div>\n
    \n
    \n
    \"Worm<\/div>\n
    \n
    Catalog or Custom \u00b7 D1\u2013D3 \u00b7 M2\u2013M10<\/div>\n
    Worm en wormwielset van gelegeerd staal<\/div>\n
    The starting point for any alloy steel worm gear specification. Catalog ratios (5:1 to 100:1) at standard modules M2\u2013M10 deliver in 5\u201315 working days. Non-standard ratios (any integer from 5:1 to 300:1) manufacture without new tooling as Level 3 semi-custom, first order 4\u20136 weeks, reorder 2\u20133 weeks. 40Cr shaft through-hardened to 50\u201356 HRC with ZCuSn10Pb1 tin bronze wheel is the D2 standard. SCM415 carburized shaft (58\u201362 HRC) + ZCuAl10Fe3 wheel available for D3 shock applications. Every set ships with material certificate to mill heat number and CMM dimensional inspection report. Bore machined to H7 at any specified diameter \u2014 no extra charge for non-catalog bore sizes.<\/div>\n

    Bekijk product \u2192<\/a><\/p>\n<\/div>\n<\/div>\n

    \n
    \"Precisie<\/div>\n
    \n
    Replacement \u00b7 Profile-Matched \u00b7 Any Bore<\/div>\n
    Precisie cilindrisch wormwiel<\/div>\n
    For specifying a replacement wheel against an existing worm shaft, provide the shaft module, lead angle (or lead\/pitch), and pitch diameter \u2014 or send the shaft for reverse measurement. Korea Ever-Power hobs the replacement wheel with a cutter matched to the shaft geometry, producing documented \u226570% contact pattern coverage. Available in ZCuSn10Pb1 (D1\u2013D2), ZCuAl10Fe3 (D3 impact), ZCuSn12 (elevated-duty D2), SS316 (food\/marine Zone 1), and PA66\/POM for low-load light-noise applications. Bore to any H7 diameter. Keyway to DIN 6885A or omitted. CMM report covering bore diameter, keyway width, and tooth runout included.<\/div>\n

    Bekijk product \u2192<\/a><\/p>\n<\/div>\n<\/div>\n

    \n
    \"Customised<\/div>\n
    \n
    OEM Program \u00b7 Any Parameter \u00b7 PPAP Available<\/div>\n
    Customised Worm Gear Set<\/div>\n
    When the full 10-parameter specification falls outside catalog range \u2014 non-standard ratio, left-hand thread, non-standard module, unusual bore geometry, or any combination \u2014 the Level 3 semi-custom program provides a confirmed quotation within one working day of receiving the complete specification checklist. NDA executed before any drawing submission. PPAP Level 1, 2, or 3 available for automotive and OEM supply programs. Medical device ISO 13485 documentation program available. Supply programs from 10 pieces per order with blanket order option for established programs.<\/div>\n

    Bekijk product \u2192<\/a><\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n

    \n
    \n

    Specification FAQ<\/span><\/p>\n

    Worm Gear Specification \u2014 Questions from Engineers and Buyers<\/h2>\n<\/div>\n
    \nI only know the motor power and the required output speed. Is that enough to start?+<\/span><\/summary>\n
    \n

    It is enough to start, but not to complete the specification. From power P and output speed n\u2082: required output torque T\u2082 = P \u00d7 \u03b7 \/ \u03c9\u2082, where \u03b7 is estimated efficiency (use 0.65 for a conservative start) and \u03c9\u2082 = n\u2082 \u00d7 2\u03c0\/60. Gear ratio follows from motor speed: i = n\u2081\/n\u2082. Module follows from torque. You still need bore diameter, fit type, material, and documentation level \u2014 which require knowledge of your shaft size and operating environment. Submit what you have and mark the remaining parameters as ‘to be determined’ \u2014 Korea Ever-Power will identify what additional information is needed before the specification can be completed.<\/p>\n<\/div>\n<\/details>\n

    \nWhat is the correct service factor for a packaging machine that starts and stops 120 times per hour?+<\/span><\/summary>\n
    \n

    High-cycle start-stop applications generate impact torque peaks at every start that can be 2\u20134\u00d7 the running torque. For 120 start-stop cycles per hour with a direct-on-line (DOL) motor start, SF = 2.0 is appropriate. If a soft-start motor controller is used, the starting torque peak is reduced to approximately 1.2\u20131.5\u00d7 running torque, allowing SF = 1.5. The distinction matters because the module selected from the design torque (load \u00d7 SF) directly determines the gear physical size and housing envelope. Specifying DOL starting at SF = 1.5 underestimates peak loading; specifying soft-start at SF = 2.0 over-sizes the gear. Confirm motor start method before finalising the service factor.<\/p>\n<\/div>\n<\/details>\n

    \nHow do I calculate the required bore diameter if I don’t have the shaft drawing?+<\/span><\/summary>\n
    \n

    The bore must be sized to fit the drive shaft with the correct interference or clearance. If the shaft drawing is not available: (1) measure the actual shaft diameter with a vernier or micrometer to 0.01 mm; (2) determine the required fit type (H7\/n6 for standard duty, H7\/p6 for heavy duty); (3) calculate the shaft nominal diameter range that fits within the H7 bore tolerance at the correct interference. Alternatively: measure the shaft and request the bore that achieves H7\/n6 fit on the measured shaft. Korea Ever-Power can calculate the correct bore diameter from a measured shaft dimension. Never simply specify ‘to fit’ without a dimension \u2014 manufacturing tolerance requires a specific numerical value.<\/p>\n<\/div>\n<\/details>\n

    \nThe nearest catalog ratio is 40:1 but I need exactly 37:1. What are my options?+<\/span><\/summary>\n
    \n

    37:1 with a single-start worm (z1=1) requires a 37-tooth wheel \u2014 the same hobbing equipment used for a 40-tooth wheel at the same module simply changes the index gear setting. This is a Level 3 semi-custom specification. No new tooling is required. Lead time: 4\u20136 weeks for the first order, 2\u20133 weeks for reorders. The additional cost over the catalog 40-tooth wheel is typically 20\u201340% per piece at small quantities, reducing to 10\u201315% at production quantities (50+ pieces per order). Provide the full specification checklist and Korea Ever-Power will confirm that 37:1 at the required module is achievable and return a quotation.<\/p>\n<\/div>\n<\/details>\n

    \nWhat precision class should I specify for a solar tracker drive that must hold within 0.1\u00b0 angular accuracy?+<\/span><\/summary>\n
    \n

    Solar tracker angular accuracy of 0.1\u00b0 at the output shaft corresponds to approximately 0.08 mm at a 50 mm worm wheel pitch radius. This requires backlash below 0.08 mm \u2014 achievable with DIN 7 precision class (ground, 0.03\u20130.07 mm backlash range) or with a duplex worm gear at near-zero backlash. Standard DIN 8\u20139 precision (0.05\u20130.15 mm backlash typical) is borderline and may not consistently achieve 0.1\u00b0 accuracy across the temperature range of outdoor operation. For solar tracker applications, specifying a duplex worm gear with adjustable backlash provides consistent accuracy as temperature varies across the day \u2014 the backlash can be re-adjusted seasonally without component replacement.<\/p>\n<\/div>\n<\/details>\n

    \nMy machine uses metric dimensions but the customer’s drawing specifies AGMA quality class. How do I convert?+<\/span><\/summary>\n
    \n

    AGMA quality classes and DIN precision classes measure similar geometric parameters (profile deviation, lead error, pitch variation) but use different tolerance calculations and measurement conventions. Approximate conversions: AGMA 12 \u2248 DIN 5; AGMA 11 \u2248 DIN 6; AGMA 10 \u2248 DIN 7; AGMA 9 \u2248 DIN 8; AGMA 8 \u2248 DIN 9. For precision-critical applications, these conversions are approximate \u2014 the exact tolerances must be compared for the specific gear size and module. Korea Ever-Power can provide DIN tolerance values for a specific gear geometry and confirm whether they satisfy an equivalent AGMA quality class requirement for the customer’s drawing review.<\/p>\n<\/div>\n<\/details>\n

    \nI need a worm gear for a hoist application where self-locking is a safety requirement. What specification parameters are critical?+<\/span><\/summary>\n
    \n

    For a safety-critical self-locking application: (1) z1=1 (single-start worm \u2014 mandatory for reliable self-locking at the target ratio); (2) ratio \u2265 20:1 (lower ratios have higher lead angles that may not self-lock); (3) self-locking condition verified at maximum expected operating temperature with the actual specified lubricant \u2014 not at ambient conditions; (4) lubricant viscosity grade matched to operating temperature (lower viscosity at high temperature reduces friction angle and may eliminate self-locking); (5) self-locking calculation documentation provided, showing lead angle, friction coefficient at worst-case temperature, and calculated safety margin (\u03c1’ – \u03bb \u2265 1.5\u00b0 minimum). Korea Ever-Power provides this self-locking calculation as standard documentation for single-start worm gear sets ordered for safety-function hoist applications.<\/p>\n<\/div>\n<\/details>\n

    \nWhat is the difference between ‘center distance’ on the gear set and ‘center distance’ on the housing?+<\/span><\/summary>\n
    \n

    The theoretical centre distance is calculated from the gear geometry: a = m(q + z\u2082)\/2. The actual centre distance in the housing is determined by the bearing positions machined into the housing casting. The housing centre distance must match the theoretical gear centre distance within the precision class tolerance (typically \u00b10.10 mm for DIN 8, \u00b10.05 mm for DIN 7). A larger-than-theoretical centre distance increases backlash and may reduce the tooth contact area. A smaller-than-theoretical centre distance creates mesh pre-load, increases running temperature, and risks tooth tip interference. When specifying or designing a custom housing, always confirm the housing centre distance tolerance against the gear precision class tolerance before machining.<\/p>\n<\/div>\n<\/details>\n<\/div>\n

    \n
    \n

    Submit Your Specification for a Same-Day Quotation<\/h2>\n

    Complete the 10-parameter checklist and send to sales@wormwheelgear.top. Korea Ever-Power returns a confirmed quotation \u2014 with specification confirmation, lead time, and documentation availability \u2014 within one working day.
    \n\u2699 Producten bekijken<\/a><\/p>\n<\/div>\n<\/div>\n

    Redacteur: Cxm<\/p>","protected":false},"excerpt":{"rendered":"

    Knowledge Series \u00b7 Worm Gear Specification How to Specify a Worm Gear \u2014 The Complete Engineer’s Checklist The 10 parameters you must define before a worm gear specification is complete \u2014 in the correct order, with the calculation behind each one \u2014 plus a printable checklist that produces a confirmed quotation within one working day. […]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[4774],"tags":[1394,1399],"class_list":["post-1914","post","type-post","status-publish","format-standard","hentry","category-worm-gear","tag-worm-gear","tag-worm-gear-worm"],"_links":{"self":[{"href":"https:\/\/wormwheelgear.top\/nl\/wp-json\/wp\/v2\/posts\/1914","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wormwheelgear.top\/nl\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wormwheelgear.top\/nl\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wormwheelgear.top\/nl\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/wormwheelgear.top\/nl\/wp-json\/wp\/v2\/comments?post=1914"}],"version-history":[{"count":2,"href":"https:\/\/wormwheelgear.top\/nl\/wp-json\/wp\/v2\/posts\/1914\/revisions"}],"predecessor-version":[{"id":1916,"href":"https:\/\/wormwheelgear.top\/nl\/wp-json\/wp\/v2\/posts\/1914\/revisions\/1916"}],"wp:attachment":[{"href":"https:\/\/wormwheelgear.top\/nl\/wp-json\/wp\/v2\/media?parent=1914"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wormwheelgear.top\/nl\/wp-json\/wp\/v2\/categories?post=1914"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wormwheelgear.top\/nl\/wp-json\/wp\/v2\/tags?post=1914"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}