Automatic Small Shaft Straightening Machine: Precision Up to 0.02 mm
Tiny shafts bend like every other slender part, but they bend faster: a shaft of 3-8 mm diameter and 50-80 mm length leaves every handling step with new curvature, and the tolerances it must meet at assembly leave no room for the traditional press-and-check bench. This machine straightens small precision shafts automatically, to 0.02 mm, with a closed loop from measurement through correction to re-inspection.
Who Needs This Machine? Core Application Fields of Small Precision Shafts
Who Needs This Machine: Core Application Fields of Small Precision Shafts
Our equipment targets manufacturers producing tiny shafts (Φ3–8mm, L50–80mm) widely used in these industries:
- New Energy & Micro Motor IndustryBLDC fan motor shafts, vehicle auxiliary motor shafts, drone gimbal shafts, water pump micro shafts. Slight bending causes motor vibration, abnormal noise and bearing premature wear.
- Power Tool & Home ApplianceDrill motor armature shafts, blender/ hair dryer motor cores, small gear shafts. Mass production requires stable straightness to reduce assembly reject rate.
- Precision Hardware & Medical EquipmentMiniature pin shafts, encoder rotary shafts, medical instrument transmission shafts, optical equipment guide rods. High rotation precision is mandatory for stable operation of precision devices.
- Automotive Small PartsVehicle sensor shafts, throttle valve tiny shafts, window lifter miniature axles. Strict linearity standards for automotive safety components.
- Office & Automation EquipmentPrinter roller shafts, robot micro drive shafts, textile machine tiny transmission rods.
Universal Pain Points of Traditional Shaft Straightening
Universal Pain Points of Traditional Shaft Straightening
Most factories still rely on manual single-station straightening, facing these long-standing troubles:
❌ Low & Unstable Precision
Manual dial indicator measurement + hand press correction, highly dependent on worker experience. Small shafts cannot reach under 0.05mm precision, lots of semi-finished products reworked; tiny bending missed easily, leading to finished product noise & jamming.
❌ High Labor Cost & Low Efficiency
Separate feeding, measuring, straightening, sorting all need operators. Cycle time long, unable to match automated production lines; skilled straightening workers hard to recruit & expensive.
❌ Uncontrolled Reject Rate & Hidden Defects
Over-pressing easily causes shaft surface indentation, internal micro-cracks; workpieces exceeding bending limit cannot be automatically screened, defective parts flow into next process, triggering mass complaints.
❌ No Automatic Loading & Unloading for Mass Production
Conventional straighteners lack vibration bowl feeding + manipulator handling, bulk messy shafts need manual sorting one by one, seriously limiting hourly output.
❌ No Closed-Loop Intelligent Correction
Single-point measurement only, cannot calculate accurate bending direction; unable to auto-repeat straightening for NG workpieces, secondary inspection missing.
Our Straightening Machine Advantages
Our Straighening Machhine Solves All Pain Points
✅ Fully Automatic Unmanned Production
Vibration bowl feeder auto sorts messy shafts + handling manipulator synchronous loading/unloading. Shafts under 80mm require zero manual intervention, auto separate qualified & NG boxes with audio-light alarm for over-limit workpieces.
✅ Industry-Leading Ultra Precision: Small Shaft Straightening Accuracy 0.02mm
1–3 KEYENCE high-precision displacement sensors for full-circle runout detection; 20Ton servo closed-loop pressing system, auto calculate bending angle & pressure value, precise correction without over-straightening.
✅ Closed-Loop Inspection-Straightening-Reinspection Cycle
Auto measure → auto locate bending point → servo straighten → secondary recheck; unqualified pieces repeat correction automatically, only send fully qualified shafts to good product bin.
✅ Integrated Compact Structure, Easy Line Integration
Overall size L2100×W2000×H2300mm, weight 1.5Ton; KEYENCE PLC + Proface touchscreen, production data traceable, compatible with factory automation production lines.
Core Machine Specifications
Core Machine Specs
- Applicable shaft: Dia 3–8mm, Length 50–80mm
- Straightening precision: 0.02mm
- Cycle time: 30–120s/pc
- Max servo pressing force: 20Ton
- Power: 380V 3-phase 35kW
- Air pressure: 0.5Mpa
Machine Video
The following is the video about the straightening for this small shaft:
Reading the 0.02 mm Number
An accuracy figure is only meaningful together with the measurement that backs it. On this machine, 1-3 KEYENCE displacement sensors scan the shaft around the full circle, so the bending direction is calculated rather than guessed, and the servo correction after the scan is aimed at the worst direction first. The secondary recheck closes the loop on every part, which is what turns a best-case specification into a batch-level result.
For small shafts, the supporting process detail matters as much as the headline tolerance: how parts are presented to the machine, how they are held during measurement, and how results are recorded for the quality system. The general mechanics of automatic shaft straightening are explained in how automatic shaft straightening works, the measurement terminology in straightness vs. runout vs. TIR, and multi-point sensor arrangements in LVDT multipoint shaft measurement. Our workhorse page for shaft-type parts across the size range is the straightening machine for shaft type parts.
If you are troubled by unstable shaft straightness, high labor cost and high rejection rate, send workpiece drawings to us for free technical solution & trial straightening!
More information please visist our website:
www.straighteningmachinery.com
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