Bruno Lehmann AG precision components and CNC assemblies

Precision manufacturing and mechanical assemblies by Bruno Lehmann AG (Switzerland): Mazak, Gildemeister, DMG Mori machines, and Extenderbolts.

Mazak Integrex i-200 and i-100 multi-tasking machining centers

Multi-tasking machining centers Mazak Integrex i-200 S U1000 and i-100 S integrate a milling spindle, secondary turning spindle, and multi-axis SMOOTHX CNC. The system performs precision 5-axis turning and milling of complex industrial parts with outer diameters up to 350 mm.

Synchronous 5-axis machining envelope handling components with diameters up to 350 mm.
High-torque milling spindle paired with secondary spindle for complete part turnaround.
Automated bar feeder unit up to 65 mm and heavy-duty gantry loader system for 350 mm.
Rigid bed structure optimized for tight tolerances across alloy steels and titanium.

Gildemeister TWIN 65 and CMZ TTL multi-turret turning centers

Dual-turret turning centers Gildemeister TWIN 65 and CMZ TTL-66-66-T1Y-T2Y feature a sub-spindle and B-axis for high-speed balanced bar machining up to 65 mm. Simultaneous multi-tool engagement substantially shortens production cycles for recurring precision mechanical batches.

Twin tool turrets with live driven tooling and B-axis kinematics for dual-end cutting.
High-throughput bar stock processing up to 65 mm utilizing Siemens and Fanuc CNC.
Synchronized secondary spindle for automated part pick-up and reverse end finishing.
High-resolution glass scale encoders maintaining sub-micron dimensional repeatability.

DMG Mori Sprint 42 linear Swiss-type turning machines

High-precision Swiss-type and short-turning DMG Mori Sprint 42 linear machines with linear drives and live tooling produce shafts, hydraulic fittings, and bushings up to 42 mm. Linear motor technology delivers dynamic tool positioning and microscopic geometric repeatability.

Linear motor drive units providing friction-free rapid traverses without backlash.
Precision bar machining up to 42 mm equipped with automated bundle magazine loader.
Multi-station driven tool blocks performing radial and axial milling and threading.
Mirror surface finish generation eliminating secondary grinding and deburring steps.

Star SR-20RII micro-precision Swiss-type lathes

Star SR-20RII Swiss-type automatic turning centers are engineered for micro-mechanical machining of miniature parts up to 20 mm. The synchronized guide bushing and secondary pick-up spindle enable ultra-precise fabrication of slender pins, precision dowels, and miniature bolts.

Micro-machining capability processing thin slender rods with diameters from 1 to 20 mm.
Synchronous rotary guide bushing mechanism preventing workpiece deflection under cut.
Sub-spindle pick-up system completing complex back-working operations in parallel.
High-speed Fanuc CNC system delivering accurate sub-micron axis synchronization.

Patented Extenderbolts expanding pivot pins and assemblies

A proprietary development by Bruno Lehmann AG, Extenderbolts expanding pivot pin assemblies solve mechanical play in heavy construction and forestry joints. Tapered expanding sleeves compensate for lug wear, restoring joint rigidity without expensive boring or welding repairs.

Elimination of pivot joint play in excavator booms and hydraulic cylinder mounts.
Dual tapered expansion sleeves machined from hardened high-tensile alloy steel.
Rapid mechanical installation achieved using standard hand tools directly on site.
Extended working durability for earthmoving, forestry, and agricultural linkages.

Wenzel LH65 coordinate measuring machine and ISO quality audit

Geometric accuracy verification across Bruno Lehmann AG components takes place inside a climate-controlled inspection room using a Wenzel LH65 CMM. An inspection volume of 650x750x500 mm paired with Renishaw tactile probes ensures sub-micron compliance with blueprints.

Precision 3D metrological verification within a 650x750x500 mm working envelope.
Climate-controlled inspection room held at a steady calibration temperature.
Renishaw scanning probe systems evaluating form tolerances, runout, and pitch.
Delivery of comprehensive dimensional inspection protocols for machined batches.

Swiss precision manufacturing heritage and engineering craftsmanship

Swiss industrial enterprise Bruno Lehmann AG, internationally recognized for advanced precision engineering, operates its manufacturing headquarters in Trub within the Emmental valley of the Canton of Bern.

With an engineering history spanning over eight decades since its founding in 1944, the firm specializes in high-precision turning, milling, and multi-axis mechanical assemblies designed for mechanical engineering, fluid power hydraulics, and industrial automation.

Adhering to strict Swiss manufacturing standards, Bruno Lehmann AG works with structural carbon alloys, stainless steels, titanium, and non-ferrous metals.

Modern production technology paired with deep workforce expertise ensures strict geometric fidelity and surface integrity across both prototype development and large recurring production runs.

Multi-axis turning and milling on advanced CNC machining centers

The production facilities of the LT-Fertigung division within Bruno Lehmann AG incorporate modern multi-tasking centers such as the Mazak Integrex series and CMZ turning units.

Featuring synchronized milling spindles, secondary turning spindles, and dynamic B-axis movement, these machine tools perform comprehensive five-axis shaping of complex structural bodies in a single automated setup.

Eliminating secondary clamping setups removes cumulative locating errors, preserves tight concentricity between mounting journals, and allows technicians to hold tight tolerances across internal grooves and precision threads.

Automated workpiece handling via bar feeders and gantry units enables continuous throughput with consistent quality.

High-throughput Swiss-type turning and small-part production

For high-volume production of precision pins, fluid fittings, threaded bushings, and mechanical fasteners, Bruno Lehmann AG utilizes Swiss-type automatic turning centers from Star and DMG Mori Sprint.

High-speed linear motor axes deliver rapid tool indexing without mechanical friction, supporting tight dimensional repeatability across large order quantities.

Synchronized rotary guide bushings support slender cylindrical workpieces right at the cutting tool tip, eliminating deflection and tool chatter during deep longitudinal turning.

Secondary pick-up spindles complete reverse-side drilling and deburring in parallel, delivering fully finished parts directly into collection bins.

Patented Extenderbolts expanding pivot pin technology

An engineering specialty of Bruno Lehmann AG is the proprietary Extenderbolts expanding pivot assembly system. Engineered for heavy equipment linkages, the assembly comprises a high-tensile central pin and split conical expansion sleeves that expand radially against worn mounting bores when torqued.

This mechanical expansion eliminates pivot joint play in excavator booms, forestry harvesters, and heavy linkages without requiring line boring or bore welding in field conditions. Routine installation utilizes basic workshop wrenches, significantly shortening repair downtime for mobile equipment.

Metrology inspection room and ISO quality management

Quality management at Bruno Lehmann AG is governed by an audited ISO 9001:2015 framework. Final geometric inspection of finished components occurs inside a dedicated metrology room maintained at a constant calibration temperature of twenty degrees Celsius.

A Wenzel LH65 3D coordinate measuring machine fitted with high-precision Renishaw tactile scanning probes inspects profile runout, hole position, and cylindrical form tolerances against digital engineering blueprints. Complete measurement documentation protocols accompany verified production lots.

Technical component identification and custom engineering support

Selection of replacement parts, fabrication of custom components, and specialized Extenderbolts pin sizing rely on engineering blueprints or technical data from machine rating plates.

Engineering staff review three-dimensional models in STEP and IGES formats to determine optimal alloys and heat treatment requirements.

Evaluating joint dimensions and service load conditions ensures precise mechanical fit and preserves designed service life across heavy mechanical drive trains. Technical guidance is available for specialized machinery builders seeking dependable Swiss precision manufacturing.

Bruno Lehmann AG and model names are trademarks of their respective owners and are used only to identify the equipment for which we source parts. SpareX is not an official dealer, distributor or representative of Bruno Lehmann AG and is not affiliated with the trademark owner. Origin, documents and warranty are stated for each item in the quotation.