What to Look for When Buying a Used QC American Grinder
QC American grinders are precision machines built with vertically integrated manufacturing and aged castings. Used units retain excellent geometric accuracy when properly maintained, but thorough inspection is essential.
On gear grinders, inspect the grinding spindle, wheel dresser, and workpiece axis. Test the grinding spindle for runout, vibration, and bearing condition at operating speed. On form grinders (YK73xx series), verify the diamond dressing wheel and CNC dressing system produce accurate tooth profiles. On generating grinders (YK7236 series), check the worm wheel condition and the electronic gearbox (EGB) synchronization between the grinding wheel and workpiece rotation. Run a test gear and measure profile and lead accuracy.
Verify the CNC control, encoders, and feedback systems. QC American machines primarily use NUM Axium Power 1050H controls with Heidenhain rotary encoders and glass scales. Confirm that all axes home correctly and that encoder feedback matches commanded positions. Check the SBS balancing and acoustics system for proper wheel balance detection. On machines with on-board gear inspection capability, run a test measurement cycle to verify accuracy.
On cylindrical grinders, check the wheelhead, tailstock, and table ways. Test grinding spindle runout and bearing noise. Verify workholding concentricity. Check table ways for wear and confirm smooth traverse across full stroke. On machines with in-process gauging, verify calibration.
QC American CNC Generating Gear Grinders
YK7236-A
The YK7236-A is the most popular generating grinder in the QC lineup, with 360 mm (14.18 inch) tip diameter workpiece capacity. Features NUM Axium Power 1050H CNC, Heidenhain rotary encoders and glass scales, SBS balancing and acoustics, and conversational or G-code programming. Designed for batch production of ground gears with high accuracy and repeatability.
YK7236-B
The YK7236-B shares the same footprint and specifications as the A model but adds production-oriented features including automatic stock sensing and dividing, grinding wheel braking, and up to three-start threading capability. This model targets higher-throughput gear production environments where cycle time and automation matter.
Additional Generating Platforms
QC American's generating grinder program encompasses five platforms total, covering gear sizes from 10 mm root through 500 mm tip diameter. Configurations range from manual-operation machines suited to toolroom and low-volume work through fully automated systems with integrated workpiece loading for high-volume production.
QC American CNC Form Gear Grinders
YK7332-A Horizontal Form Grinder
The YK7332-A is a horizontal CNC form (profile) gear grinding machine for cylindrical gears with outside diameters up to 320 mm (12.6 inches). The machine grinds involute gears, cycloid gears, precision splines, and worm workpieces. Features include CNC wheel dressing with diamond dressing wheel, NUM controls, and high thermal stability. The horizontal orientation accommodates spline and cluster gear configurations.
YK73125 Vertical Form Grinder
The YK73125 is a vertical CNC form grinder with 1,250 mm (50 inch) tip diameter capacity and 600 mm (24 inch) face width capability. Equipped with a 20 kW (27 HP) grinding spindle, on-board inspection, and the same NUM software platform as smaller models. Serves large gear applications in energy, mining, and heavy industrial sectors.
Full Form Grinding Program
Seven form grinder platforms cover internal and external gears, rotors, and splines from 30 mm through 2,000 mm tip diameter in both horizontal and vertical configurations. All feature on-board inspection options, extensive customization, and QC's proprietary grinding software for profile and lead modification, topological grinding, and fillet optimization.
QC American Cylindrical Grinders & Gear Finishing
The cylindrical grinding program includes CNC and manual OD grinders for standard, universal, and high-speed applications. Specialty models serve camshaft, crankshaft, and bearing grinding markets. All cylindrical grinders share QC's vertically integrated manufacturing approach with aged castings, in-house spindle production, and precision assembly.
Gear finishing machines handle lead and profile chamfering, rounding, and deburring on workpieces from 35 mm through 2,000 mm. Both fixed and flexible configurations are available to suit production volume and part variety requirements.
How to Sell Your Used QC American
QC American grinders hold value as specialized precision equipment with growing recognition in the North American market. Generating and form gear grinders are in steady demand from gear manufacturers, job shops, and rebuild operations.
Resell CNC buys used QC American and Qinchuan grinders: every model, nationwide.
- Contact us — call (844) 478-8181 or email sales@resellcnc.com.
- Free appraisal within 24 hours, no obligation.
- Accept the offer — we handle rigging, transport, and logistics.
Frequently Asked Questions About Used QC American Machines
What is the relationship between QC American and Qinchuan?
QC American, LLC (Ypsilanti, Michigan) is a wholly owned subsidiary of Qinchuan Machine Tool & Tool Group Corp. of Baoji City, China. QC American imports, integrates, customizes, and services QC machines for the North and South American markets. Used machines may carry QC American or Qinchuan branding.
What is the difference between generating and form gear grinding?
Generating (worm wheel) grinding uses a threaded wheel that meshes with the workpiece in continuous rolling contact. Form grinding uses a profiled wheel dressed to the exact tooth shape, grinding one gap at a time. Generating is faster for production; form grinding offers maximum flexibility for special profiles.
Are used QC American machines reliable?
Yes. QC manufactures with vertical integration from castings through spindle production. Aged castings, ISO 9001 certification, and over 40 national technology awards back the build quality. Machines use proven NUM controls with Heidenhain feedback components.
What CNC control does QC American use?
Most QC American gear grinders use the NUM Axium Power 1050H CNC with Heidenhain rotary encoders and glass scales. Cylindrical grinders may use NUM or Siemens controls. QC-developed software enables conversational and G-code programming with gear parameter calculation, profile optimization, and on-board inspection.
How do I sell my used QC American?
Contact Resell CNC at (844) 478-8181 or sales@resellcnc.com. We buy every QC American and Qinchuan model: gear grinders, cylindrical grinders, and finishing machines. Any condition, nationwide. Free appraisal within 24 hours.