Motors for Drilling

Air motors with collets or chucks are perfect for precise drilling and brushing applications.
The air motors are available in a broad speed range with several special features for build in applications.

Main features of the air motors:
• Stainless steal housing
• Rotating splash guard
• Without valve for central remote control
• Small housing diameter for minimum centre-to-centre spacing
• Type "SL" for anti-clockwise rotation
• Type "MRD" with guided exhaust air

Stainless Steel Drilling and Brushing Motors from Mannesmann Demag: Technology, Application, and Selection

Stainless steel drilling and brushing motors from Mannesmann Demag are designed for industrial manufacturing and assembly environments where corrosion resistance, cleanability, and durable mechanical performance are required. These drive units are available with collet chucks as well as conventional drill chucks; they combine compact designs with optimized air- or watertight housings, precise bearing solutions, and electrical interfaces that integrate seamlessly into production facilities.

Materials and Housings

The housing of the relevant models primarily consists of stainless steel (AISI 304 or AISI 316), ensuring chemical resistance to cleaning agents and spray water. AISI 316 variants are suitable for applications with higher chloride loads or in food and pharmaceutical environments. Internal components such as the rotor and stator are typically hardened and coated to minimize electro-erosion and abrasion. Sealing-line compliant seals (Viton, NBR, or FKM depending on media resistance) and IP protection classes up to IP67 are available to protect the motor against splash water and temporary submersion.

Electrical and Mechanical Connection Details

Power classes cover common industrial requirements: from low-voltage drives (12–48 V DC) to 230–400 V AC. Typical nominal powers in the product range from a few hundred watts to several kilowatts for heavy drilling applications. Motor speeds are either fixed or continuously adjustable via electronic speed controllers; brushed versions offer simple adjustability via voltage, while brushless variants (BLDC) contain internal electronics for precise characteristics and higher efficiency. Tool holding is either via collet chucks in sizes from 0.5–6 mm for precision tools or via drill chucks with conventional clamping ranges; for collet chucks, concentricity and run-out accuracy are crucial selection criteria.

Bearings, Cooling Systems, and Maintenance

For drilling and brushing applications, high-quality roller or ball bearings are predominantly used, often with additional preload to increase axial and radial stiffness. In high-load or continuous-shift operations, it is advisable to choose bearings with increased thermal stability and lubricant reservoirs that allow for longer lubrication intervals. Cooling in compact motors is achieved by natural convection or integrated fans; for water-cooled variants, external connections for circulation cooling are provided to maintain constant operating temperatures under high loads. Maintenance access points are designed to allow for quick and documented brush set changes and bearing inspections.

Insulation, Protection, and Standards Compliance

The winding insulation complies with common classes (up to Class H) to safely handle thermal loads and commissioning cycles. Explosion-proof variants (ATEX) are available for hazardous areas. Electrical connections are routed via standardized connectors or cable glands; optional fieldbus or IO-Link interfaces enable connection to higher-level controls. The motors comply with relevant standards for electromagnetic compatibility (EMC) and electrical safety, making them suitable for use in automated lines with traceability.

Connection Technology and Control

For process integration, interfaces for speed control and torque monitoring are crucial. Models with integrated encoder options provide accurate position and speed values for reproducible drilling and brushing cycles. For brushed motors, control signals can be simply realized via voltage or PWM; for brushless motors, an ESC or integrated driver handles signal evaluation. Therefore, for automated assembly cells, motor variants with digital feedback (e.g., TTL encoder, resolver, or SSI) are to be preferred.

Use Cases and Practical Examples

Practical Example 1 — Cleanroom Drilling in Medical Technology: In an assembly line for medical housings, stainless steel drilling motors (AISI 316, IP67) with collet chucks 0.5–3.0 mm are used. The motors are water-cooled, have Class H insulation, and an integrated encoder. A process control system regulates the speed profiles depending on the workpiece material (hardened stainless steel vs. aluminum) and measures the starting torque for early detection of tool wear. Practical Example 2 — Brushing in Surface Finishing: For deburring and brushing applications on stainless steel sheets, brushed motors with speed control are used. The robust bearings with additional lubricant reservoirs enable long operating times without interruption. Brushing discs are fixed via drill chucks or collet chucks; the motors are equipped with splash water protection and chemical-resistant seals to allow cleaning processes with mild solvents. Practical Example 3 — Integration into Robotic Cells: In a robot cell, a compact brushless drilling module performs precise drilling cycles at varying positions. An integrated resolver provides position data, while closed-loop speed control monitors the immersion depth. The design allows for quick tool changes via an automatic clamping system, thereby minimizing downtime.

Selection Criteria: How to Choose the Right Motor

Select motors based on the expected torques, required run-out, environmental influences, and desired control interfaces. Pay attention to the housing material's compatibility with cleaning processes, the IP protection class for splash or immersion water, the insulation class for thermal loads, and available encoder or sensor options for process feedback. Sizing recommendations are based on specific machining parameters: tool diameter, material hardness, cutting speed, and machining duration. * Power design, torque, and speed requirements

Assembly, Commissioning, and Maintenance

During assembly, ensure precise alignment of the collet chuck or drill chuck to avoid imbalance and increased bearing wear. Electrical connections must be made with suitable cable glands and strain reliefs. Maintenance plans should include brush change intervals, bearing inspections, and seal checks. Documented measurements of no-load current and starting torque serve as indicators of incipient wear. For hygienically critical areas, smooth surfaces and rounded housing edges are recommended to minimize cleaning effort and dead spaces.

Compatibility and Accessories

Complementary components include drill chucks in various jaw sizes, collet sets, cooling connections, and electronic motor controllers. For automated production lines, adapter plates, torque-limiting couplings, and tool changers are available. Detailed technical data sheets and integration notes can be found on our technology page: https://maku-industrie.de/technik. Practical implementations and application examples are documented at https://maku-industrie.de/anwendungsbeispiele.

Procurement and Documentation

Delivery data sheets contain electrical characteristics, mechanical interface drawings, test protocols, and spare part numbers for wear components. Orders should specify, in addition to the motor number, desired options such as housing material, IP protection class, encoder type, and connection configuration. For series applications, preliminary PV tests (process validations) are recommended to optimize speeds and feed parameters.

Sustainability and Lifecycle

By using corrosion-resistant materials and maintenance-friendly designs, longevity and lifecycle costs can be reduced. Replaceable brush sets, standardized bearing sizes, and repairable electronic modules enable economical maintenance. Recyclable material combinations and documented repair processes support operational sustainability goals.

FAQ

1. Which IP protection classes are common for stainless steel drilling and brushing motors and when are they necessary?

Common protection classes range from IP54 for dust-protected production environments to IP67 for temporary submersion and intensive cleaning cycles. Choose IP67 for wet cleaning, frequent spray operation, or use in food/pharma; IP54 is sufficient for dry assembly and final assembly environments.

2. When is a collet chuck the better standard compared to a drill chuck?

Collet chucks offer higher concentricity, lower run-out error, and are preferred for small diameters (precision tools). Drill chucks are more flexible for a wider range of tool diameters and are suitable for changing operations with different tool sizes.

3. What maintenance intervals are recommended for brushed motors?

Maintenance intervals depend on operating hours, load profile, and environmental conditions. In standard industrial applications, visual inspection and cleaning intervals every 3–6 months are common; brush set and bearing inspections should be performed at least annually or immediately checked if no-load current increases or starting values change.