Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts . main principles involvedin the art of tool-grinding may bepractically applied as follows: . „. First, to define the point which distinguishes whether the stone is running to or from you, let A, , represent a grindstone, and B, C, D, E, and F tools held thereon. If a radial line from thecentre of the stoneforms an obtuse angle with the face of the tool which first meets a point on theperiphery, or face of the stone as it is usually termed, then the stone is running from
Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts . main principles involvedin the art of tool-grinding may bepractically applied as follows: . „. First, to define the point which distinguishes whether the stone is running to or from you, let A, , represent a grindstone, and B, C, D, E, and F tools held thereon. If a radial line from thecentre of the stoneforms an obtuse angle with the face of the tool which first meets a point on theperiphery, or face of the stone as it is usually termed, then the stone is running from you; whileif, on the other hand, that face forms an acute angle to the radial line, then the stone is runningto you, no matter in what position in regard to the stone you may stand. In ordinary shop par-lance, the side of the stone on which the face of the stone enters the trough is always called the sidewith the stone running to you, because all grinding which requires to be done with the stone runningto you is performed on that side, and in conjunction with the use of the rest shown in Fig. 221,7. It. 74 GRINDSTONES. is very dangerous to grind on that side of the stone without using the rest as a steadying point andas a safeguard. B and C are ground with the stone running from you, I) is neutral, and F Fare ground with the stone running to you. Hence, with the stone running to you, the greater theangle of the front face of the tool (that is, the face which has the grindstone running toward it), the greater the liability 2227.
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