Grinding

APM's Colorado machine shop features the latest in surface, cylindrical and internal grinding technology. We utilize surface, belt, bench and CNC cylindrical machines to deliver high-quality parts.

The grinding machine consists of a power driven grinding wheel spinning at the required speed (which is determined by the wheel’s diameter and manufacturer’s rating, usually by a formula) and a bed with a fixture to guide and hold the workpiece. The grinding head can be controlled to travel across a fixed workpiece or the workpiece can be moved while the grind head stays in a fixed position. Very fine control of the grinding head or table position is possible using a vernier calibrated hand wheel, or using the features of numerical controls.

Grinding machines remove material from the workpiece by abrasion, which can generate substantial amounts of heat; they therefore incorporate a coolant to cool the workpiece so that it does not overheat beyond its tolerance. The coolant also benefits the machinist as the heat generated may cause burns in some cases. In very high-precision grinding machines (most cylindrical and surface grinders) the final grinding stages are usually set up so that they remove about 200 nm (less than 1/100000 in) per pass – this generates so little heat that even with no coolant, the temperature remains tolerable.


For additional information about CNC grinding, contact one a milling and machining expert at Advanced Precision Machining today.






Types of Grinding Machines:



  • Belt grinder: With the aid of coated abrasives, belt grinding is a versatile process suited for applications such as finishing, deburring and stock removal.

  • Bench grinder: Manually operated and used to shape tool bits.

  • Cylindrical grinder: Used to make precision rods, a cylindrical grinder has multiple grinding wheels to form a cylinder.

  • Surface grinder: A grinding wheel on which a workpiece is moved back and forth upon.

  • Jig grinder: Primarily function is to grind holes and pins as well as complex surface grinds on work started on a mill.

  • Gear grinder: The final machining process when manufacturing a high precision gear.



Types of Grinding Machines:


  • Knee mill
  • Bed mill
  • Box mill or column mill
  • C-Frame mill
  • Gantry mill

Knee mill or knee-and-column mill refers to any milling machine whose x-y table rides up and down the column on a vertically adjustable knee. This includes Bridgeports.


This refers to any milling machine where the spindle is on a pendant that moves up and down to move the cutter into the work. These are generally more rigid than a knee mill.


Basic hobbyist bench-mounted milling machines that feature a head riding up and down on a column or box way.


These are larger, industrial production mills. They feature a knee and fixed spindle head that is only mobile vertically. They are typically much more powerful than a turret mill, featuring a separate hydraulic motor for integral hydraulic power feeds in all directions, and a twenty to fifty horsepower motor. Backlash eliminators are almost always standard equipment. They use large NMTB 40 or 50 tooling. The tables on C-frame mills are usually 18″ by 68″ or larger, to allow multiple parts to be machined at the same time.


The milling head rides over two rails (often steel tubes) which lie at each side of the work surface.


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