Castle Nuts, also referred to as Castellated Nuts, are used for applications in aerospace and automotive markets where the nut cannot loosen. A cotter pin or safety wire is inserted through a cross-drilled bolt extending through the opposing slots to mechanically prevent the nut from loosening. Without the Castle Nut, the nut would separate from its shaft potentially leading to catastrophic results.

Current Process

Slotting Saws, Abrasive Grinders, Wire EDM, and Sinker EDM are popular mechanical and abrasive processes used for slotting Castle Nuts. The slotting operation requires three cuts per part, cutting two slots per pass. Parts are loaded manually.

Challenge

Typical saws and grinding processes require frequent wheel dressing or saw changing, dramatically reducing productivity and throughput. Current manufacturing processes can distort the slot, damage the thread, or deform the thread. Secondary deburring or re-tapping is often required after slotting. This results in increased scrap rates, increased cycle times, and reduced throughput.

Current Process

Zirconium tubes are cut one at a time using carbide tools on a lathe. A lathe cutoff leaves burrs requiring deburring to achieve a smooth surface finish. Carbide tooling wears quickly when cutting zirconium and is expensive.

Challenges

Deliver a cost-effective process to cut zirconium tubes which reduces the number of steps in production. Zirconium is highly flammable, and a dull carbide tool can cause the material to overheat and catch fire. Zirconium fires are dangerous and very hard to extinguish.

Challenge

Cycle time reduction while maintaining overall machine uptime resulting in increased throughput. Added versatility to the control system allowing process improvement through actionable reporting. Reducing maintenance such as wheel dressing to increase up time. NiTi is a difficult material to shape due to its high nickel content, moreover, a smooth surface finish is critical to prevent part failure.

Manufacturers use grinding machines with a narrow work wheel requiring several passes to reduce the diameter and achieve acceptable surface finish. Thus creating longer cycle times. Machines are difficult to adjust for setup and changeovers requiring highly skilled technicians. Heavy material removal in a short distance deforms thin walled tubing and causes burns.

Deliver a process with a small footprint that can grind tubes while maintaining a high quality part. Decrease downtime related to maintenance, troubleshooting, and complicated changeovers.

Challenge

Converted OD grinders with custom tooling and soft grinding wheels all of which wear at a high rate. Setup and changeover time is significant and requires extensive mechanical adjustments. Parts, in most cases, must be taped for handling requiring additional steps in the production process. Primary cut leaves a large ID burr which must be removed in a secondary process step such as grit blasting or electro-polishing. Complex needle points, i.e. Menghini points, require separate primary bevel cut and secondary sharpening, leading to long cycle times.

Develop a solution that delivers a process eliminating taping, pre and post processing, allows for quick set-up and changeover, and is capable of handling all variety of points used in the industry.

Challenge

Parts are cut using abrasive cutting saws, conventional abrasive grinding, wire EDM or laser cutting; slow processes resulting in long cycle times. Potential to expose material to high heat leading to heat affected zones, recast, and slag. Requires secondary process to deburr parts and remove any surface debris which reduces productivity.

Design a process that can provide a burr free cut without recast, slag, or heat damage while maintaining a high quality part and reducing cycle time. Reduce the number of steps in the production process.

Challenge

The arthroscopic shaver teeth are commonly produced by conventional abrasive grinding, wire EDM, or laser cutting; slow processes resulting in long cycle times. EDM and laser cutting burn away the metal at high temperatures leaving changes to the metal surface including a heat affected zone, recast, and slag. Laser cutting requires significant post processing to produce an acceptable sharp edge and surface finish. Conventional grinding requires a secondary process of deburring without damaging the cutting edge. It also involves frequent wheel dressing to maintain the correct form.

Design a process that can cut shaver teeth burr free, without recast, slag, or heat damage that improves cycle times.

Challenge

Tubes are cut one at a time using a standard abrasive cutting saw which leaves burrs. Requires secondary process of wire brushing and tumbling to deburr tubes and remove any debris. Older machines have poor accuracy and outdated safety features. Debris from abrasive cuts cause frequent maintenance issues.

Design a process that can cut multiple tubes burr free simultaneously without damage from debris. Reduce the number of steps in the production process. Provide a machine that won’t deteriorate over time.

Challenge

Numerous manufacturers around the world find themselves with legacy equipment incapable of meeting the changing environmental and safety standards recommended by regulatory standards. The customer in this case was operating an outdated grinding system lacking mist control with minimal safety features.

Maintain CE safety and environmental standards without hampering the functionality of the machine. Thrufeed grind 0.003”- 0.006” of material from steel tubes with a tolerance of +/- 0.0002 and achieving a superior surface finish. Lastly, the customer required the ability to connect the machine to the intranet for data gathering, monitoring and remote diagnostics.

 Challenge

The operator would manually feed the stainless steel orthopedic pins into the centerless grinder then manually clean and gauge each pin. Manual input and adjustment were required during the process to ensure quality.

Increase process throughput and quality production by integrating automation. Produce a part every 13 seconds in an automated “lights out” system. Reduce the opportunity for damaging critical features in material handling.

Challenge:

The customer was outsourcing grinding of components and came to Glebar looking for a way to reduce lead times on parts, reduce costs, and bring grinding capability in-house.

Original challenge was to thrufeed 1-½” diameter, 15’ aluminum tubes removing 0.003”-0.006” per pass. The second requirement was for the machine to be capable of grinding 8’ steel tubes which featured a 1” diameter bearing surface in the middle of the tube which could not be ground. This meant that the grind would have to begin in the middle of the tube where the machine had to infeed into that section and then initiate a thrufeed process. The part also had a thin wall that had to be maintained and the grinding process had to be controlled to avoid burning.

Challenge: Customer wants to increase output for steel taps used to drill threaded holes as used in the machining and tooling industry.  In addition to speeding up the throughput time, achieving the exact tolerances is critical for the component to create the proper threads.

Challenge:  A tier one Medical OEM wanted to improve its existing in-house process for grinding Nitinol Tubing. The existing machine was an older thrufeed centerless grinder which had a narrow wheel. The narrow wheel required the operator to grind the part to size in multiple passes.

Challenge: The customer is looking for a turnkey, one operation automated process allowing a single pass solution for Stainless Steel Bone Pins, for example.

Challenge: Customer wants to decrease cycle time by taking this from a one-sided traditional surface grinding application requiring two operations to a single double end grinding application.

Challenge: To devise a new process for an automotive component manufacturer to automatically grind and gauge pinion shafts for differentials. The shafts are made of hardened steel. The Customer is looking to expand their automotive manufacturing portfolio by bringing large volume production in-house.

Challenge: To design a fully automated turnkey feeding and inspection solution, integrated into to a Glebar GT-610 Thrufeed Grinder that ensures a one hundred percent defect-free product that is ground to a minimum 1.7 CpK and packaged hands-free. 

Challenge: To auto thrufeed grind metal valve seat components which are used in the automotive industry. The customer needed a system which could accurately grind and gauge 3,000 parts per hour. The width and nonsymmetrical geometry, would be the most difficult challenge engineers would face in devising a successful staging and feeding process as they are not able to line and stack up onto a traditional conveyor without falling over. 

Challenge: To grind two mating metal components, with a tight clearance requirement between their surfaces, to create a powered arthroscopic shaver used in orthopaedic joint surgeries.

Challenge: A tier one automotive fastener supplier needed to grind bolts for a major automotive company automatically at high volume, with a high degree of precision.The customer’s existing process was outsourced and was running one part at a time, resulting in a higher cost for our customer.In addition, quality and consistency of the components post grind was an issue.

Challenge: To grind diameters on parts of many sizes and lengths for a manufacturer of aerospace fasteners. The goal was to provide a solution that gave the customer a machine with intelligence, in-process inspection, ease of use and to maximize up time and production rates. 

Challenge: A tier one machine tool component manufacturer needed an in-house process to grind stainless steel shafts, used for Spring Lifters, automatically at a high volume, with a high degree of precision. The customer’s existing process was outsourced, resulting in a higher cost, in addition quality and consistency of the components post grinding was an issue.  The customer’s requirement was to have a large amount of stock removed while maintaining an 8Ra surface finish. 

Challenge: To grind two mating metal components, with a tight clearance requirement between their surfaces, to create a powered arthroscopic shaver used in orthopaedic joint surgeries.

Challenge: A food equipment manufacturer approached Glebar to improve productivity and reduce costs for their food filler machines. The metal spout requires grinding for several reasons. They come in contact with food, therefore requiring a smooth finish for sanitary purposes. The tubes are often exchanged on the machines to dispense various size pastries. Also, the mating housing for the spouts must be a close fit to prevent leaking and to keep appropriate content pressure to dispense the precise amounts.  Eight different components needed to be ground, all approximately four-inches in length, however they varied in diameters and weight. The variation of part geometries posed the biggest feeding challenge. Rapid changeover of grinding wheels was important to reduce setup time between the components. 

Challenge: Lack of a clear, simple method to inspect the geometric profile of many components. Existing systems are slow, unreliable, and complex to operate.

Challenge: Lack of a clear, simple method to inspect the geometric profile of many components. Existing systems are slow, unreliable, and complex to operate.

Challenge: To grind a variety of tooling punches to extreme precision, while accommodating small lot sizes with short changeover times. 

Challenge: Cycle time reduction and a sharp corner needed for a medical guidewire

Challenge: To eliminate additional processes in the production of guidewires. The conventional process uses several machines to profile a shape in an interventional guidewire.

Challenge: To grind burnishing and expander rolls used in manufacturing tubes for a multitude of applications ranging from oil and gas tubes to automotive. Due to the shape of the parts which includes several tapers, the material removal is dramatic requiring several operations. Additionally the rolls are custom shapes so changeover between part types requires reshaping the grinding wheel. 

Challenge: A Medical device customer needed to rapidly changeover between a family of Nitinol guidewires having various lengths and geometries. Since the geometry of the components varied in length, the customer needed to change tooling over frequently, a process that can take up to 4 hours. Also, rapidly removing over 30% of the the material as it thrufeeds into the machine accelerated tool wear on the existing system and as tooling degrades, dimensional integrity suffers.

Challenge: To grind 2 diameters for a large manufacturer on an intricate, metal injection molded part (asthma inhaler) in high volume (millions of parts per year) to micron precision. The component needed to be precisely ground to insure critical fit in a mating portion of the device to guarantee that the device would function as intended at all times. 

Challenge: Lack of a clear, simple method to inspect the geometric profile of many components. Existing systems are slow, unreliable, and complex to operate.

Challenge: Quality, cost control and lead time issues of outsourcing the pre-sizing of titanium and steel bars 

Challenge: Infeed grinding 0.010”  on two diameters over a 7” long metal drill blank in one operation while maintaining 0.0002” diameter accuracy, .00006 roundness and maintaining part straightness and concentricity. 

Challenge: To process trocar points automatically where small lot sizes require frequent equipment changeover. 

Challenge: To thrufeed automatically thru feed grind an automotive component and achieve a 1.2 Rz surface finish