Miniaturizing Linear Motion and Measurement

A design engineer at a dental equipment company was handed a challenging assignment.

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A design engineer at a dental equipment company was handed a challenging assignment. The firm’s development team must devise the industry’s first handheld intraoral scanner that would perform 3D imaging for dental impressions in the dentist’s office. The scanner’s small size required a miniaturized linear motion and measurement system that was not available on the market.

The question facing the designer: develop a new linear motion and measurement system internally, or seek a supplier that could customize its product to meet the scanner’s challenging specifications. That’s an issue that haunts many design engineers at medical, dental, and life science equipment companies today.

Product development teams are under excruciating pressure to make their products smaller, lighter, and more accurate. More and more, they are embracing the practice of collaborative customization with suppliers to fulfill their linear motion and measurement needs.

Collaborative Customization

The concept of suppliers performing custom engineering for original equipment manufacturers (OEMs) is not new.

But a more collaborative approach is gaining in popularity as product cycle times and budgets shrink. Collaborative customization on linear motion and integration systems involves a tight partnership between the supplier and OEM. By fostering close, highly communicative and transparent relationships, dramatic breakthroughs in design and cost are possible.

These benefits include:

  • Integration of functions in sub-assemblies results in fewer components
  • Designing for manufacture reduces assembly time and costs
  • Single sourcing offers one point of accountability for technical support and problem resolution
  • Parallel engineering efforts cut product development time

While customization may result in a higher initial price, the benefits stated above typically reduce the total cost of ownership and achieve the OEM’s cost targets. It also creates customer-centric products that are not presently available in the market.

Integrating Linear Motion and Measurement

Linear motion and measurement are core technologies in dental and medical equipment, life science instruments, and optical systems. In the past, separate subsystems were required to incorporate these functionalities. Traditional linear motion and measurement systems were large and required additional engineering work to integrate their operation.

SCHNEEBERGER has created a new technology, the MINISCALE PLUS, which consists of a fixed carriage and rails that move with a maximum acceleration of 300m/s2 back and forth. An integrated scale enables positioning of a sensor in 0.1-micron resolution. The device maintains exceptionally accurate movement because measurement takes place close to the working process. The MINISCALE PLUS is delivered in a module that simply drops into the OEM’s product. That means system complexity is reduced and the development process is dramatically accelerated.

Selecting a Collaborative Customization Partner

Not every linear motion supplier is resourced and facilitated to engage in product and system customization. In evaluating vendors, look for the following attributes and capabilities:

  • Deep engineering expertise that is focused on linear motion and measurement products and operates with an innovation culture
  • Flexible manufacturing systems that can adapt to the new production requirements of a customized product. This includes incorporating lean rules and Industry 4.0 processes that can build high-quality components costs effectively
  • Full commitment to reliably meet delivery requirements
  • Flexibility to absorb fluctuations in market demand

Selecting the appropriate customization partner should not be based on price alone.

Dental Equipment Maker Employs Collaborative Customization to Miniaturize Handheld Scanner

A recent project with a dental equipment manufacturer represents a successful application of collaborative customization. The OEM envisioned a new handheld intraoral scanner that would enable the practitioner to generate in-office 3D impressions of patients’ teeth for crowns, bridges, and implants. The device required linear motion and measuring systems that would hold the instrument’s sensor, fit into a handheld form factor, and move rapidly in extremely small and accurate movements. When finished, the scanner’s software processes the images to create a 3D representation of the patient’s teeth.

The company’s engineering team believed that SCHNEEBERGER’S MINISCALE PLUS system could meet the challenging demands of the handheld product, and installed it in a proof-of-concept prototype. While the SCHNEEBERGER technology worked in the prototype, it was evident the standard MINISCALE PLUS system was too large for the final scanner design.

The linear motion and measurement system was a key element in the scanner’s functionality. The dental equipment company engaged SCHNEEBERGER in a collaborative customization effort to miniaturize the MINISCALE PLUS’ components. The two companies’ engineering teams worked closely together to achieve the project’s daunting design goals: reduce the height of the guide rails by 50% and shrink the system’s weight from 80 grams to 3 grams.

SCHNEEBERGER’S engineering and manufacturing teams recognized that the standard MINISCALE PLUS system would require a total redesign to meet the OEM‘s challenging specifications. Most importantly, every aspect of the product’s manufacturing process would need to be revised and optimized. This work included raw material selection, pre-machining, hardening, grinding, and assembly. In addition, each component had to be produced using a lean process.

Once completed, the advantages of the collaborative customization project were impressive.

They included:

  • Cutting the OEM’s product development time by 20% over an internally engineered component
  • Achieving the customer’s cost target
  • Lowering the OEM’s assembly costs since the integrated MINISCALE PLUS system had fewer components and was plug and play out of the box in the dental scanner
  • Providing a single point of accountability and technical support for both the motion and measurement systems

Most importantly, a new dental scanning system was introduced to the market that offered significant competitive advantages. Dentists welcomed its light weight, ease of use, and accuracy, plus the opportunity to improve the patient experience.


As medical and dental equipment, life science instruments, and optical systems decrease in size, innovation in linear motion and measurement systems becomes critical. Collaborative customization has become a viable and cost-effective approach to innovation in component miniaturization. By engaging with suppliers that have deep and focused engineering expertise, OEMs can accelerate product development, lower assembly costs, and create products that achieve dramatic competitive advantages in the market.

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