Grinding Journal - Summer 2007 - (Page 16)

The art of grinding™ Knowing the source of grinding errors & how to fix them F ixing grinding errors is one of the most common, yet least understood, topics in the industry today. The results of an error are sometimes easily visible, such as chatter marks or those annoying comma shapes on your piece, sometimes referred to as pickup marks. Other errors, like a slight out-of-roundess, may be harder to detect. Fixing any error is easier when you understand that grinding combines a number of sub-processes, much like a chain is linked together. Each step relies on the steps adjoining it for a successful outcome. must first understand some of the forces involved. As illustrated below, chip removal involves both a tangential force as the wheel cuts (Fn) and the normal downward force Ft. At the same time the wheel rotation is exerting force shown here as Vc and the workpiece is moving along an axis creating the force marked Vw. These forces and the links in the grinding process can lead to geometrical grinding errors, such as dimensional or positional deviations, and physical or chemical errors, such as unwanted changes in the Grinding combines a number of sub-processes… Grinding uses the abrasive on the grinding wheel to remove material from the workpiece, so wheel selection greatly influences the process. Factors like the abrasive itself, the bond holding it to the wheel, and the density of the abrasive all affect the grind. But the process chain can also consist of the coolant, dressing tool, the material you are grinding, the machine you are grinding it on, the machine’s settings, the clamping of the workpiece, etc. This list can continue, but you get the picture. The most important thing to remember is that the weakest link in the process sets the limit of the process capability. …and several forces To understand how to fix grinding problems, you 16 Grinding Journal It is important to understand the forces of the grinding process in order to understand how to fix grinding problems Illustration courtesy Winterthur Corp.

Table of Contents Feed for the Digital Edition of Grinding Journal - Summer 2007

Contents My Thoughts Exactly When Lives Are at Stake Walter Consolidating Production The Art of Grinding: Knowing the Source of Grinding Errors and How to Fix Them The How and Why of Conventional Vitrified Grinding Wheel Selection Grinding Glass Flat Problem Solver

Grinding Journal - Summer 2007

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