Standard CP racks and pinions
Matched components selected around circular pitch, tooth count, travel, and mounting requirements.
circular pitch rack and pinion
Circular Pitch Rack and Pinion
Custom CP racks and pinions for applications that use convenient whole-millimetre travel per pinion revolution.
Product overview
Technical overview of circular pitch rack and pinion.
A circular pitch rack and pinion, often shortened to a CP rack and pinion, is organized by linear circular pitch rather than conventional module naming. Its main design advantage is straightforward travel planning: a compatible pinion can be selected so one revolution produces a convenient linear movement. ZhongYi reviews custom CP rack-and-pinion drawings for pitch, pinion tooth count, expected travel per revolution, pressure angle, rack length, mounting holes, material, heat treatment, backlash, and positioning duty. CP components must be kept separate from ordinary module racks because similar-looking parts are not automatically interchangeable.
Product types
Circular Pitch Rack and Pinion types and manufacturing paths.
The final product form is confirmed from the buyer drawing, mating component, assembly layout, operating conditions, and inspection requirements.
Tapered CP systems
Axially adjustable rack-and-pinion forms that may be used where the mechanism is designed to adjust backlash.
Hardened or ground CP racks
Wear- and accuracy-conscious components with heat treatment and finishing defined by the approved drawing.
Round or special CP racks
Custom structural forms for moving-rack layouts, restricted mounting space, or a purpose-built positioning mechanism.
Selection guidance
How to specify the correct configuration.
Define the desired linear movement for one pinion revolution before choosing tooth count. The design should then confirm pitch, pressure angle, pinion diameter, rack length, stroke, mounting height, and whether the rack is used in one piece or joined sections. Backlash becomes particularly important when the axis reverses direction. The RFQ should state positioning tolerance, repeatability expectation, load, speed, acceleration, duty cycle, lubrication, and the method used to support and align the rack.
Material Options
- Carbon steel for general CP rack systems
- Alloy steel for specified hardening and grinding routes
- Stainless steel where the drawing requires corrosion resistance
- Alternative materials reviewed for load and dimensional stability
Selection Factors
- Circular pitch, pressure angle, and pinion tooth count
- Required travel per revolution and total stroke
- Rack length, pitch-line height, joint, and mounting pattern
- Backlash adjustment, reversing motion, and positioning accuracy
- Material, hardening, finishing, lubrication, and environment
Applications
Circular Pitch Rack and Pinion application fit.
Match the gear type with real machinery conditions, operating environment, load, speed, and replacement requirements.
- Linear positioning and indexing equipment
- Automation axes and handling systems
- Packaging, printing, and machine adjustment mechanisms
- Applications needing convenient metric travel per rotation
Quality and technical verification
Inspection requirements tied to approved technical data.
Useful engineering evidence is more valuable than unsupported quality claims. Critical checks, records, and acceptance criteria are defined from the drawing and purchase requirement.
For a custom circular pitch rack and pinion, ZhongYi reviews the rack and pinion as a functional pair. Drawing control should cover pitch, tooth count, travel calculation, datum surfaces, hole pattern, rack joint, heat treatment, and inspection method. Depending on the requirement, inspection may address tooth thickness, cumulative pitch, pitch-line height, straightness, hardness, pinion runout, and assembly movement. Buyers should verify the completed travel calculation in their mechanism before ordering; no positioning accuracy is promised without an agreed tolerance and inspection plan.
All products can be custom manufactured from drawings or samples.
Buyer FAQ
Common technical and purchasing questions.
These answers support early technical review. Final dimensions, materials, tolerances, and process requirements are confirmed against the approved file for each enquiry.
How is a CP rack different from a module gear rack?
A CP rack is specified by circular pitch in millimetres, while a conventional metric rack is generally specified by module. The two systems can produce different pitch geometry and should not be mixed without a complete compatibility calculation.
Why use a circular pitch rack and pinion?
It can simplify motion planning because the pinion may be selected for a convenient whole-millimetre travel per revolution. The actual movement still depends on the confirmed pitch and tooth count.
Can backlash be adjusted in a CP rack system?
Backlash may be controlled through mounting distance or a purpose-designed tapered or split arrangement. The adjustment method must be built into the mechanism and identified in the rack-and-pinion drawings.
Custom manufacturing
Send drawings or samples for technical review.
ZhongYi can review geometry, material, heat treatment, bore, keyway, tooth profile, application conditions, and order quantity before quoting.
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Send drawings, samples, or technical requirements for review.
Our team can review your gear type, material, heat treatment, tolerance, order quantity, and application conditions before quotation.