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Drill Motors and Brush Motors with Collets from Mannesmann Demag: Selection, Technology, and Application

Drill motors and brush motors with collets from Mannesmann Demag offer targeted solutions for precise drilling operations, screwing, and grinding applications in industrial environments. The design with a collet allows for the accommodation of various shank shapes (round, conical, ground) and ensures high concentricity, low-vibration operation, and quick tool changes. Typical areas of application include assembly and processing stations, maintenance, prototype construction, and durable series production in mechanical engineering, the automotive and supplier industry, and metal processing.

Construction and Materials

Mannesmann Demag relies on robust housing materials such as die-cast aluminum or hardened steel for housings and gear parts, combined with bronze- or steel-bearing armature shafts to extend service life. The rotor, depending on the power class, consists of a low-loss steel laminate package or higher-quality special materials. The collets are available in quick-change and precision versions made of hardened spring steel; coated or stainless variants are available for corrosive environments. Seals often consist of NBR (nitrile rubber) for oil and lubricant resistance or FKM/Viton for higher temperatures and chemical resistance. Cable glands are implemented with common industrial cable glands or according to protection class (IP54–IP65) to ensure dust and splash water protection.

Performance Data and Designs

The product range includes compact direct drives for light drilling work as well as geared variants with reduction for high torques. Speeds typically range from 500 to 30,000 rpm, depending on the motor and gear combination. Rated powers vary from a few tens of watts to several kilowatts. Models with brushes feature replaceable carbon brushes and simple maintenance; brushed motors provide high starting torques and are inexpensive to purchase and for spare parts. Collet chucks are offered in common sizes (e.g., 1–13 mm); special dimensions can be configured. For stationary machine integration, flange or bearing seats are available, and for handheld devices, ergonomic housing shapes and vibration-damping handles.

Connections, Control, and Safety

Electrical connections are made as standard via shielded cable outlets with cross-sections matching the motor power. Control options range from simple on/off switches to speed controllers and electronic motor controls with speed and torque monitoring. For industrial applications, variants with integrated tachogenerators or Hall sensors are available to connect automation systems. Thermal circuit breakers and overload protection are integrated or retrofittable in many models. Protection classes up to IP65 support use in damp or dusty production areas.

Application and Practical Handling

The correct selection begins with the task and the tool used. For precise drilling in hardened steels, a collet with high concentricity (<0.02 mm) combined with a motor with constant torque at low speed is recommended. When drilling in non-ferrous metals or wood, higher speeds with correspondingly smaller collet chucks are more efficient. Brush motors with high starting force are suitable for screwing applications with high starting resistance; the replacement of carbon brushes should be considered in maintenance plans.

Practical Example 1 — Series Assembly: Press-fit and Drilling Operation
In an assembly line for hydraulic valves, a Mannesmann Demag drill motor with 1,000 W and a 1–10 mm collet chuck is used. The motor is flange-mounted to a precision drilling unit. At specified drilling positions, electronic speed control ensures a constant 1,500 rpm, and the collet holds Ø6 mm carbide twist drills with exact concentricity. After 8 hours of shift operation, the collet is opened for inspection, dirt is removed, and the seal at the cable gland is checked. This combination ensures reproducible drilling depths and minimal rework.

Practical Example 2 — Maintenance: Spare Part-Friendly Brush Motors
In the maintenance of conveyor systems, a brushed motor is used because the environment has large temperature fluctuations and sporadic loads. The collet allows for quick changes to chisel attachments and cutting tools. The carbon brushes are accessible and quickly replaceable, minimizing downtime. Additionally, the motor is equipped with an IP54 seal to reduce dust ingress.

Practical Example 3 — Precision Manufacturing: Fine Drilling in Hardened Steel
In a toolmaking environment, a motor with low speed and high torque is combined with a precision collet. Coolant supply via a sealed line minimizes tool heating and prevents stress cracks in the workpiece. The collet is checked at each tool change to ensure concentricity errors <0.01 mm. Documented inspection intervals ensure quality throughout series production.

Assembly, Maintenance, and Spare Parts

Assembly instructions include the correct alignment of the collet on the shaft, tightening torques of screw connections, and the use of recommended sealing materials. Regular maintenance consists of cleaning the collet, checking concentricity and clamping force, replacing carbon brushes in brush motors, and lubricating or checking bearings in geared versions. Available spare parts include collet sets, carbon brushes, seals (NBR, FKM), cable glands, and complete shaft or armature assemblies. For specific maintenance intervals, users refer to load cycles, thermal stress, and operating hours.

Connection to Automation and Manufacturing Environments

Integration into automated manufacturing cells requires standardized interfaces such as flange dimensions, torque measurement systems, and feedback via digital I/O or CANopen/Profibus for higher-end variants. For robot applications, compact designs with a defined center of gravity and mounting holes are essential. The combination of collet and electronic control allows for quick tool changes using a gripper arm, enabling flexible setup times for batch size 1 and small series.

Tool Compatibility and Standards

Collet chucks often follow standards such as DIN or ISO; special versions are possible if required. Tool holder, concentricity quality, and material hardness influence the interface to collets; for precision work, hardened shank seats and balancing tests before series start are recommended. CE conformity, EMC tests, and safety tests can be documented for series deliveries.

Where to Find More Information and Application Examples

Technical details, product data sheets, and specific application examples can be found on our technology page at https://maku-industrie.de/technik and detailed practical cases at https://maku-industrie.de/anwendungsbeispiele. Our technical sales team is available for advice on selecting the right Mannesmann Demag model; please specify operating conditions, material, and desired collet dimensions when inquiring.

What to Consider When Ordering

When ordering, pay attention to the exact specification of the collet range, rated power, rated speed, protection class (IP), and connection type. Specify the intended tool diameters and materials so that we can recommend suitable seals, coatings, and brush variants. For integration into machine controls, information on control protocols and space conditions at the mounting location is helpful.

Quick Checklist

• Collet range, rated power, speed, protection class, tool material

FAQs

1. What are common collet sizes and how do I choose the right one?
Common collet sizes range from 1–13 mm. Choose the size based on the smallest and largest tool diameter you intend to use, and pay attention to concentricity requirements. For high precision, prefer tight collet tolerances and hardened holders.

2. How often do carbon brushes need to be replaced in brush motors?
Replacement intervals depend on load, operating hours, and environmental conditions; a typical interval is between 500 and 2,000 operating hours. Visual inspection of the wear mark and spark inspection provide practical indicators; documented maintenance plans extend service life.

3. Which sealing materials are suitable for aggressive coolants?
For aggressive media and higher temperatures, FKM/Viton seals are suitable. NBR is suitable for standard oils and coolants. For special chemicals or high temperatures, EPDM or PTFE-coated seals are recommended after material confirmation by the supplier.