Description

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Miniature High Lead Ball Screws integrate compact shaft diameters with multi-start thread profiles to achieve fast linear travel at low rotational speeds. Designed for compact precision equipment, these components deliver drive efficiency above 90% and stable motion control within minimal installation space.

Key Features

01/

Fast Linear Travel: Multi-start threads deliver leads matching or exceeding shaft diameters, increasing stroke speed without elevating motor RPM.

02/

Small Footprint: Shaft diameters ranging from 4 mm to 12 mm fit directly into tight spatial envelopes and micro-actuators.

03/

Low Rotational Inertia: Reduced moving mass lowers motor torque demand during rapid acceleration and deceleration cycles.

04/

Smooth Recirculation: Integrated end caps guide bearing balls continuously through multi-start paths with low acoustic noise.

05/

Controlled Axial Clearance: Thread grinding processes limit axial play to satisfy precision positioning specifications.

Technical Specifications

Parameter	Value / Range	Unit
Shaft Diameter	4, 6, 8, 10, 12	mm
Lead	4, 6, 8, 10, 12, 16, 20	mm
Precision Class	JIS C3, C5, C7	Grade
Shaft Material	SCM415H, Chrome Moly Steel, Stainless Steel SUS440C	Material
Surface Hardness	58 - 62	HRC
Operating Temperature	-20 to +80	°C

Product Configuration

Screw Shaft: Precision thread-ground or cold-rolled alloy steel shaft with micro-finished raceways.

Ball Nut: Flanged or cylindrical nut bodies with compact radial dimensions.

Bearing Balls: Micro-sorted steel or stainless steel balls held to strict roundness tolerances.

Recirculation Deflectors: Resin end inserts designed for multi-start ball tracking.

Wiper Seals: Elastomer seals integrated at both nut ends to prevent particle contamination.

Accuracy and Lead Error

Accuracy Grade	Cumulative Lead Error per 300 mm	Fluctuation Value	Production Method
C3	0.008 mm	0.006 mm	CNC Thread Grinding
C5	0.018 mm	0.012 mm	Precision Thread Grinding
C7	0.050 mm	0.035 mm	Precision Thread Rolling

Preload and Backlash Options

Code	Type	Axial Clearance	Application Profile
P0	Standard Clearance	0.015 - 0.030 mm	General horizontal transport
P1	Light Preload	Below 0.005 mm	Precision positioning, vertical movement
P2	Medium Preload	Zero clearance	High rigidity, reversing direction cycles

Dimensions and Load Ratings

Model	Shaft Diameter (mm)	Lead (mm)	Dynamic Load C (N)	Static Load C0 (N)	Nut Diameter (mm)	Nut Length (mm)
MHL 0606	6	6	1120	1850	14	22
MHL 0808	8	8	1850	3100	18	26
MHL 0812	8	12	1620	2750	18	28
MHL 1010	10	10	3200	5400	22	32
MHL 1020	10	20	2900	4800	22	36
MHL 1212	12	12	4500	7900	26	38
MHL 1220	12	20	4100	7200	26	42

Manufacturing Process

Material Verification:

Spectrographic chemical testing and ultrasonic flaw detection on all steel stock.

Thread Generation:

Cold rolling or CNC grinding based on targeted precision class.

Heat Treatment:

Case hardening achieving 0.8 mm to 1.2 mm effective case depth at target hardness.

Raceway Grinding:

Multi-axis CNC thread grinders shape the multi-start track contact angles.

Sorting and Assembly:

Optical classification of bearing balls followed by cleanroom nut assembly.

Verification Testing:

Laser interferometer verification of lead accuracy and total runout inspection.

Applications of Miniature High Lead Ball Screws

Diagnostic Equipment: Drive mechanisms for automated fluid sampling and micro-pipetting units.

Wafer Handling: Motion stages carrying microelectronic components across inspection stations.

Optical Adjustments: Lens positioning assemblies operating without stick-slip motion.

Compact Automation: Desktop laser cutters, small routing machinery, and robotic pickers.

Dispensing Modules: Multi-axis reagent distribution setups requiring compact drive hardware.

Technical Capabilities

Dedicated Grinding Lines:

Dedicated machinery setups tailored for shaft diameters under 12 mm.

Documented Quality:

Individual production runs include material test certificates and lead accuracy pitch graphs.

Shaft End Machining:

Complete turning and threading of screw journals according to engineering prints.

Ball Matching:

Dimensional sorting prevents localized torque spikes across the stroke length.

OEM and Custom Options

Journal Machining: Custom steps, keyways, snap ring grooves, and metric thread profiles.

Material Selection: Stainless steel shafts and nuts for corrosive or cleanroom operations.

Surface Coatings: Black oxide or chrome plating for extended surface protection.

Nut Modifications: Custom flange shapes, ground reference flats, and altered mounting holes.

Engineering Files and Drawings

3D CAD Models in STEP and IGS formats

2D Engineering Drawings in DWG and PDF formats

Technical Product Catalog and Selection Guide

FAQ

Q: What distinguishes high lead miniature ball screws from standard pitch models?

A: High lead designs feature a lead dimension equal to or larger than the nominal shaft diameter, producing faster linear speed per revolution.

Q: Can high lead ball screws be driven backwards from the nut?

A: Yes, efficiency levels above 90% and steep lead angles allow backdriving. Vertical applications require motor brakes or holding mechanisms.

Q: What precision grades apply to these micro drive units?

A: Ground thread configurations come in C3 and C5 grades, while rolled thread versions are produced to C7 standards.

Q: Is custom end machining provided according to project drawings?

A: Yes, shaft ends are machined to match specified bearing mounts, step dimensions, and retaining ring grooves.

Q: Which lubricants suit miniature ball screw assemblies?

A: Low-viscosity synthetic grease or high-grade mechanical oil is recommended for smooth ball circulation.

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Miniature High Lead Ball Screws