Every machine shop has a sweet spot: the class of parts it runs best, the customer relationships it has built over years, the processes it has invested in and mastered. Most shops are also honest about where their capability ends. When a part is too complex, too small, too demanding in its tolerances, or too difficult in its material, many shops will decline to quote it, or quote it at a price that reflects their uncertainty about their ability to produce it consistently.
Kremin Inc.’s sweet spot is other shops’ ceilings.
That statement is not marketing language. It reflects a specific strategic investment that Kremin has made over forty-plus years: building the people, equipment, and processes capable of tackling the most challenging components in our customers’ programs. The parts with six-decimal-place tolerances. The materials that eat tooling. The miniature components with features that require a microscope to inspect. The families of parts that require simultaneous turning, milling, drilling, and threading in a single setup on a machine that costs as much as a small house.
This post explains what that capability looks like in practice, why it matters across our four primary industries, and why it translates into a competitive advantage for the customers who work with us.
Thirteen Swiss Machines, Five Models, One Clear Focus
The centerpiece of Kremin’s precision capability is our Swiss turning department. We operate thirteen Swiss CNC lathes across five different machine models, including Citizen platforms that represent the highest engineering standard in the industry. That fleet is not an accident; it reflects a deliberate decision to go deep in Swiss turning capability rather than spreading investment across a broad range of process types.
Swiss turning is the right process for the class of components that defines our work: long, slender parts with complex multi-axis features, produced to tolerances that eliminate any margin for error. Guide bushing support at the cutting zone eliminates deflection on small-diameter work. Simultaneous main-spindle and sub-spindle machining allows front and back features to be completed in one cycle. Live tooling on multiple axes enables milled flats, cross-holes, slots, and contoured surfaces without leaving the machine.
The result is the ability to produce parts that simply cannot be made or cannot be made economically on conventional lathes or machining centers. And because complex parts are completed in fewer setups, the dimensional relationships between features are more accurate, the part-to-part consistency is higher, and the lead time is shorter.
The Materials That Define Difficult
The difficulty of a machined component is only partly a function of its geometry. Material properties determine how hard the machining problem really is, and the industries we serve in aerospace, defense, medical, energy, and advanced industrial consistently specify materials that push the limits of conventional machining.
Titanium alloys are perhaps the best example. Ti-6Al-4V is the workhorse of aerospace and medical implant applications, selected for its outstanding strength-to-weight ratio and biocompatibility. But it is one of the most challenging materials to machine consistently. Its low thermal conductivity means heat accumulates at the cutting edge, accelerating tool wear. It spring-backs elastically, making tight tolerances difficult to hold. It work-hardens, changing its cutting characteristics as the machining process progresses. Producing titanium components to the tolerances required by medical and aerospace applications requires specialized tooling, carefully controlled cutting parameters, and a level of process discipline that goes well beyond standard shop practice.
We machine titanium every day. The same is true for Inconel, duplex stainless steel, 17-4 PH stainless, A286, medical-grade PEEK, and a range of other demanding materials. Our process knowledge for each of these materials has been built through direct production experience, and our tooling investment reflects what we have learned about what works.
Miniaturization: When the Tolerance Is Smaller Than You Can See
The medical and defense industries have been driving component miniaturization for decades. Minimally invasive surgical instruments, implantable electronics, precision guided munition components, and microfluidic diagnostic devices all require components whose critical features are measured in thousandths of an inch or less.
At Kremin, we routinely machine parts with outside diameters under 0.125 inches that incorporate multiple cross-drilled holes, milled flats, fine threads, and precision tapers. These are not demonstration pieces, they are production components shipped in quantity to demanding customers. The ability to hold ±0.0002 inch tolerances on features that require magnification to inspect is the result of combining the right machine technology (Swiss turning with precision guide bushings), the right tooling (subminiature inserts and formed tools produced to close tolerances), the right inspection equipment (optical comparators, vision systems, and laser micrometers), and experienced machinists who understand what they are producing.
For customers who have had difficulty finding a supplier capable of consistently producing their miniature components, Kremin’s Swiss turning capability is often the solution they have been looking for.
Quality Infrastructure That Matches the Machining Capability
Manufacturing capability without quality infrastructure is just fast production of scrap. At Kremin, our AS9100D, ISO 9001:2015, and ISO 13485:2016 certifications are not marketing credentials; they represent a quality management system that is fully integrated into our production operations.
Our inspection equipment includes coordinate measuring machines (CMMs) for three-dimensional verification of complex feature relationships, optical comparators and vision systems for form and profile inspection, laser micrometers for non-contact diameter measurement, surface profilometers for roughness measurement to Ra and Rz specifications, and thread gages calibrated to current NIST-traceable standards. This inspection capability is what makes it possible for us to confidently accept customer orders for components that require measurement evidence as part of the delivery package.
Equally important is the documentation discipline that supports the quality system. Every production job at Kremin is accompanied by a traveler that records material certification data, every in-process inspection result, and the final inspection disposition. That documentation is the evidence that the part was produced correctly and it is what allows our customers to satisfy their own internal quality and regulatory requirements.
Kremin Inc. as Your Manufacturing Partner
Kremin Inc. is now part of Threadlock Precision, a manufacturing platform that includes J&F Machine in Cypress, California and R&S Machining in St. Louis, Missouri. Together, these three facilities offer aerospace, defense, medical, energy, and industrial customers a precision machining partner with broad geographic reach, complementary capabilities, and the combined capacity to support programs at scale.
For the individual customer working directly with Kremin, what this means is that you have access to the precision machining depth we have built over more than four decades in Frankenmuth, Michigan plus the resources and support of a platform that is investing in people, equipment, and capability for the long term.
If you have components that other shops have struggled to produce, that require certifications most shops do not hold, or that simply demand the kind of precision that separates the capable shops from the exceptional ones, we would welcome the conversation. Contact Kremin Inc. to request a quote or discuss your program. We make things other people can’t make and we’d like to show you what that means for your parts.