Business Details
50+ Years
experience
Precision Machining Services in Novi, MI
Since 1955, Detroit Diameters has established itself as a leader in precision internal honing and CNC machining. Founded by Harold Spitery in Southfield, Michigan, we relocated to Novi in 1981 and expanded our expertise to serve aerospace, automotive, defense, and industrial sectors. Our family-owned legacy continues through three generations, combining decades of experience with cutting-edge technology to deliver parts meeting exacting specifications. With a mechanical engineer on staff since 2006, we collaborate closely with clients ranging from small workshops to Fortune 500 companies.Our investment in advanced gaging systems ensures quality control at every production stage. We specialize in honing complex geometries, including blind holes, tandem bores, and thin-wall components, while maintaining tight tolerances in exotic materials. Our commitment to innovation has driven continuous growth across seven decades. By prioritizing customer satisfaction, we tailor solutions to meet unique project requirements while upholding industry-leading standards. This dedication to precision and service excellence remains our guiding principle.
Services
Internal Honing
CNC Machining
Aerospace Materials
Prototype Services
Custom Tooling
Details
- Year established: 1955
Highlights and features
- Family-owned since 1955 with three generations of machining expertise
- In-house mechanical engineer available for project collaboration since 2006
- Serves both small workshops and Fortune 500 companies with tailored solutions
- Specializes in complex honing geometries including interrupted bores and thin-wall parts
- Invests continuously in advanced gaging systems for quality assurance
Services
Internal Honing
Our precision internal honing services specialize in achieving exact bore geometries for complex components. We handle blind holes, tandem bores, and thin-wall parts with tolerances down to micro-inch finishes. Using engineered abrasive stones and computer-controlled systems, we deliver superior roundness, straightness, and surface integrity for critical applications in aerospace and defense industries.
CNC Machining
CNC machining capabilities include precision parts from exotic alloys and conventional materials. Our 10 chucking and 3 spindle capacities support complex geometries while maintaining tight tolerances. We specialize in producing components requiring secondary honing operations to meet exacting functional specifications for automotive and industrial clients.
Aerospace Materials
Specialized machining services for high-temperature alloys and exotic materials used in aerospace applications. Our expertise includes Inconel, titanium, and other heat-resistant alloys requiring precise dimensional control. We maintain strict quality protocols to meet FAA and AS9100 certification requirements for critical flight components and engine systems.
Prototype Services
Prototype and preproduction services support design validation through ramp-up to full-scale manufacturing. We offer in-house fixture manufacturing and custom tooling to accommodate unique part geometries. Our engineers collaborate with clients during development phases to optimize manufacturability while maintaining dimensional accuracy for complex components.
Custom Tooling
Custom tooling design and manufacturing capabilities enhance production efficiency for specialized applications. Our team develops bespoke honing fixtures and cutting tools to address unique bore configurations and material challenges. This in-house capability reduces lead times while ensuring optimal tool performance for specific machining requirements across multiple industries.
People
Harold Spitery
Founder
Founded Detroit Diameters in 1955, establishing its reputation for precision machining. His leadership laid the foundation for three generations of family ownership and technical excellence in internal honing processes.
Craig Spitery
Principle Owner
Guided company growth through industry changes since the 1980s. Directed strategic expansion into aerospace and defense sectors while maintaining core values of quality and customer service excellence.
Jeff Spitery
Current Leader
Continues family legacy by overseeing operations since the 2000s. Focuses on technological advancements while preserving traditional machining expertise that has defined Detroit Diameters for nearly seven decades.
Questions
What industries does Detroit Diameters serve?
We serve aerospace, automotive, defense, industrial equipment, and precision tooling sectors with specialized machining and honing solutions.
What materials can you machine?
We work with exotic high-temperature alloys, titanium, Inconel, aluminum, steel, and other conventional materials requiring precision machining.
Do you handle prototype work?
Yes, we offer prototype development through production ramp-up with in-house fixture manufacturing and custom tooling capabilities.
What bore sizes can you handle?
Our honing capabilities range from 0.060" to 28" diameters with stroke lengths up to 96" for large-scale industrial components.
How do you ensure quality control?
We use advanced gaging systems for continuous quality monitoring and maintain strict process controls throughout all machining operations.
Can you support small businesses?
We serve clients of all sizes, providing personalized attention to small businesses while maintaining large-scale production capabilities.
