For OEM buyers, a custom gear manufacturer can review a project more accurately when the RFQ includes more than a part name or target price.
Drawings, samples, gear geometry, material expectations, operating conditions, quantities, and inspection requirements all affect manufacturability, process route, timing, and cost.
Custom gear manufacturing is order-specific.
Gear type, size, module or DP, pressure angle, bore and keyway details, heat treatment, finishing process, operating load, and documentation scope should be confirmed before production.
Before requesting a custom gear quote, OEM buyers should prepare a drawing or sample, gear type, module or DP, pressure angle, tooth count, bore and keyway details, material or current material, heat treatment and hardness expectations, surface treatment needs, load, torque, speed, duty cycle, backlash or noise concerns, quantity, timing, and required inspection documents. These inputs help the manufacturer review feasibility, manufacturing route, inspection scope, and order-specific documentation.
A custom gear manufacturer supports OEM buyers by reviewing drawings, samples, gear specifications, operating conditions, quantity, and documentation needs before confirming a manufacturing route for gears or gear assemblies.
For LILY Bearing, custom gear projects can be reviewed based on customer drawings, samples, module or DP, pressure angle, tooth count, bore, keyway, mounting structure, operating conditions, quantity, and documentation requirements.
Final manufacturability, precision level, heat treatment, surface finish, inspection scope, timing, and cost depend on drawing review and order requirements.
The best custom gear RFQs reduce guesswork.
A clear RFQ helps the manufacturer identify gear type, confirm geometry, review material and process options, define inspection scope, and identify missing details before quotation.
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RFQ input |
What to send |
Why it matters |
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Drawing or sample |
2D drawing, CAD file, physical sample, worn sample, failed sample, or mating part |
Defines geometry and helps confirm whether reverse review or additional measurement is needed |
|
Gear type |
Spur, helical, bevel, miter, worm, rack, internal gear, pinion shaft, plastic gear, stainless steel gear, or assembly |
Drives the cutting method, mating-part review, inspection method, and feasibility discussion |
|
Gear geometry |
Module or DP, pressure angle, tooth count, helix angle, face width, OD, ID, bore, and tooth form |
Controls tooth geometry, fit, tooling review, and inspection scope |
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Mounting features |
Keyway, spline, hub, shaft, set screw, bearing journal, mounting holes, locating shoulder, and axial structure |
Affects machining sequence, datum control, and assembly fit |
|
Material and treatment |
Current material, expected material, heat treatment, hardness target, and surface treatment needs |
Affects strength, wear, corrosion resistance, dimensional stability, process route, and cost |
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Operating conditions |
Load, torque, speed, duty cycle, backlash, noise, lubrication, environment, and space limits |
Helps the supplier discuss material, process, tooth finishing, and validation assumptions |
|
Quantity and timing |
Prototype, pilot, replacement batch, recurring production, requested timing, and forecast if available |
Supports planning discussion without assuming fixed lead time or MOQ |
Quality documents such as Material Certificate, Dimensional Inspection Report, Gear Inspection Report, Heat Treatment Report, Hardness Report, Surface Treatment Report, FAI, or PPAP should be requested during RFQ so order-specific inspection and documentation scope can be confirmed before production.
If information is missing, state that clearly in the RFQ.
The supplier may need a sample, mating part, application context, or additional measurements before confirming the manufacturing route.
Complete drawing and CAD file: send a 2D drawing, CAD file if available, tolerances, material, heat treatment, surface finish, inspection requirements, and quantity.
Physical sample or failed gear: if the original drawing is missing, send a new, worn, or failed sample. Mating parts are useful for worm gears, bevel gears, gear pairs, and assemblies where contact pattern or fit may matter.
Incomplete specification: if geometry is not complete, provide operating conditions, shaft arrangement, mating component details, target noise or backlash limits, lubrication method, quantity, and documentation needs.
LILY can review drawings and samples for custom gear projects, but manufacturability, precision level, material route, inspection scope, timing, and cost remain subject to drawing and order review.
Naming the gear type early helps the supplier route the RFQ correctly. LILY can discuss custom gear projects such as:
Spur gears, including pinions, gear blanks, compound gears, and gear racks
Helical gears, including left-hand, right-hand, helical shafts, and mating pairs
Bevel gears and miter gears, including angled transmission projects subject to drawing review
Worm gears and worms, including worm wheels and single-start or multi-start worms
Gear racks, internal gears, pinion shafts, and gear shafts
Fine pitch gears for small transmission structures
Plastic gears, stainless steel gears, and custom gear assemblies
Final scope depends on drawings, gear type, material, process route, operating conditions, and order requirements.
Buyers should avoid assuming that every material, gear type, size, or precision level is available for every project.
Custom gear manufacturing may involve several process stages.
The correct route depends on gear type, material, size, quantity, precision target, heat treatment, finishing requirements, and inspection scope.
Blank preparation: bar cutting, forged blanks, cast blanks, turned bar-stock blanks, plate cutting, precision casting, selected powder metallurgy, and injection molding for plastic gears
Basic machining: CNC turning, bore machining, facing, OD machining, hub machining, thread machining, mounting hole machining, keyway machining, spline machining, locating shoulders, and positioning surfaces
Tooth-form and finishing processes: gear hobbing, shaping, milling, shaving, grinding, honing, broaching, wire EDM for special tooth forms, form grinding, worm turning or grinding, worm wheel hobbing, bevel gear machining, and spiral bevel gear machining
Post-process review: heat treatment, surface treatment, finishing, inspection, anti-rust protection, packaging, and quality documentation
Buyers should confirm which processes apply to the actual drawing.
Do not assume every process is used in-house or every gear can use every process.
Material selection should be confirmed according to load, speed, wear resistance, corrosion exposure, noise target, dimensional stability, cost requirements, and mating-part behavior.
Material families that can be discussed include C45 / 1045 / S45C, AISI 1018 / 1020, 40Cr / 5140, 42CrMo / 4140, 20CrMnTi / 8620, GCr15 / 52100, 304 / 316 stainless steel, 17-4PH, brass, bronze, gray cast iron, ductile iron, POM / acetal, nylon, MC Nylon, UHMW-PE, PEEK, and glass-fiber-reinforced nylon.
These are examples for discussion, not a blanket suitability claim for every application.
Heat treatment options that can be discussed during RFQ include quenching and tempering, carburizing and quenching, induction hardening, nitriding, carbonitriding, vacuum hardening, tempering, stress relieving, and surface hardening.
Surface treatment options may include black oxide, phosphating, zinc plating, nickel plating, chrome plating, electroless nickel plating, anodizing for aluminum gears, stainless steel passivation, blasting, painting, powder coating, and rust-preventive oil packaging.
Precision should be handled carefully in a custom gear RFQ.
LILY can manufacture gears according to customer drawings and applicable AGMA, DIN, ISO, JIS, or customer-specified requirements.
Precision level depends on gear type, size, material, heat treatment, finishing process, and inspection scope.
For suitable projects, LILY can discuss high-precision gear machining subject to drawing review, gear type, process route, and order-specific inspection requirements.
Buyers should confirm the required precision level, tolerance basis, and measurement method before production.
Inspection items that may be discussed include raw material chemical composition, hardness, blank dimensions, tooth profile, tooth lead, pitch error, span measurement, measurement over pins, tooth thickness, runout, bore and keyway dimensions, CMM inspection, surface roughness, case depth, contact pattern, gear pair trial assembly, and running tests when required by project scope.
Quality documents should be defined before production, especially for OEM projects with supplier-quality requirements. Inspection reports, FAI, PPAP, and other quality documents are order-specific.
Buyers should define required documents during RFQ so the inspection plan and documentation scope can be confirmed before production.
Documents that can be discussed include:
Material Certificate
Dimensional Inspection Report
Heat Treatment Report
Hardness Report
Gear Inspection Report
Surface Treatment Report
FAI / First Article Inspection, when required by the project or buyer quality process
PPAP, when required by the customer and applicable to the project
A gear inspection report may include tooth profile, lead, pitch, runout, tooth thickness, span measurement, measurement over pins, or other drawing features.
The exact report content should match the inspection plan.
Do not assume every order automatically includes PPAP, FAI, material certificates, heat treatment reports, hardness reports, surface treatment reports, or gear inspection reports.
These should be requested and confirmed during RFQ.
Unit price matters, but it is not enough for OEM sourcing.
Buyers should compare custom gear manufacturers by process fit, drawing and sample review capability, material and heat-treatment discussion, inspection scope, documentation options, and whether precision, lead time, MOQ, and application claims are confirmed against the actual order.
Can the supplier work from drawings, samples, or incomplete specifications with clear limitations?
Does the RFQ discussion cover module or DP, pressure angle, tooth count, bore, keyway, and mating parts?
Are material, heat treatment, surface treatment, and post-treatment finishing discussed before quoting?
Is the inspection scope tied to drawing tolerances and critical features?
Are required documents such as Material Certificate, Dimensional Inspection Report, Gear Inspection Report, Heat Treatment Report, Hardness Report, Surface Treatment Report, FAI, or PPAP clearly defined?
Are timing, MOQ, application suitability, and documentation claims confirmed for the actual order instead of stated as generic promises?
Before placing a custom gear order, buyers should confirm precision level, tolerances, inspection method, lead time, MOQ or prototype feasibility, material route, treatment route, required documents, PPAP or FAI scope, application suitability, packaging, and shipping requirements.
Avoid basing supplier selection on unsupported claims such as fixed lead time for all gears, universal minimum order quantity, default PPAP, default FAI, guaranteed service life, local U.S. manufacturing, or the highest precision level for every order.
Drawing, CAD file, or sample
Gear type
Module or DP / diametral pitch
Pressure angle
Tooth count
Helix angle, if applicable
Face width
OD / ID / bore
Bore, keyway, spline, hub, shaft, bearing journal, set screw, and mounting structure
Material or current material
Heat treatment and hardness expectations
Surface treatment needs
Load, torque, speed, duty cycle, backlash, noise, lubrication, environment, and space limits
Quantity, prototype / pilot / recurring production status, and requested timing
Required quality documents: Material Certificate, Dimensional Inspection Report, Gear Inspection Report, Heat Treatment Report, Hardness Report, Surface Treatment Report, FAI, and PPAP
A custom gear manufacturer usually needs a drawing, CAD file, or sample, plus gear type, module or DP, pressure angle, tooth count, bore, keyway, material, operating conditions, quantity, timing request, and document requirements.
Yes. A complete drawing is preferred, but a physical sample, worn gear, failed gear, or mating part may help when the original specification is incomplete. Final manufacturability remains subject to review.
Common custom gear requests include spur gears, helical gears, bevel and miter gears, worm gears and worms, gear racks, internal gears, pinion shafts, fine pitch gears, plastic gears, stainless steel gears, and custom gear assemblies.
Module and DP, or diametral pitch, are two ways to define gear tooth size. Module is commonly used in metric gear specifications, while DP is common in inch-based specifications. Send whichever value is on the drawing, and include pressure angle and tooth count when available.
These details affect gear mesh, shaft fit, tooling review, machining route, and inspection scope. Missing information can delay RFQ review or require sample measurement.
These operating conditions help the supplier discuss material, heat treatment, surface treatment, tooth finishing, inspection scope, and assumptions that should be confirmed before production.
OEM buyers can discuss Material Certificate, Dimensional Inspection Report, Gear Inspection Report, Heat Treatment Report, Hardness Report, Surface Treatment Report, FAI, and PPAP. These documents are order-specific and should be confirmed during RFQ.
Buyers should request FAI when first-article verification is required by the project or buyer quality process. PPAP should be discussed when required by the customer and applicable to the project. Scope, format, and timing should be defined before production.
Request a custom gear quote by sending drawings, samples, module or DP, pressure angle, tooth count, bore, keyway, material expectations, operating conditions, quantity, and required inspection documents.
LILY can review the project scope and discuss manufacturing options based on drawing and order requirements.
For a specific gear order, buyers should confirm applicable documentation, inspection scope, and project-specific quality requirements during RFQ.