Off-hand grinding

An off-hand grinding machine is used with a workpiece or cutting tool held by hand and applied to the grinding wheel. Because of this, its use requires stringent safety precautions. 

The off-hand grinding machine is basically an electric motor having a spindle at each end, each carrying a grinding wheel, also referred to as an abrasive wheel. This arrangement allows a coarse wheel to be... 

Under COShlH it may be necessary to provide extraction systems for processes where their scale creates a health hazard to the operator and other people in the vicinity. Such processes include soldering, welding, lathe work, toolroom grinding, fettling, off-hand grinding, portable sanding and... 

Off-hand. Hand-made glass-ware produced without the aid of a mould. Off-hand Grinding. See freehand... 

Off-hand grinding a fixed grinding machine (either bench or pedestal) where the work is manually presented to the grinding wheel. 

The mould is now ready for pouring. When the metal has solidified, the mould is broken up to release the casting. The runner and riser are broken off, and the rough edges are removed by fettling (Le. hand grinding). 

Glass surfaces which must fit closely are usually ground to shape. The most common example is the cone-and-socket joint the surfaces are first worked to an approximate fit with fairly coarse carborundum (about 100 mesh) which is put between them and wetted. The cone is rotated by hand or in a lathe or drill chuck, or by a special machine, until the smfaces meet closely—the carborundum must be kept moist all the time. The coarse abrasive is then washed off, and the grinding continued a number of times with progressively finer abrasive. Various possible abrasives are mentioned on p. 39. 

Contact By Any sharp edges of the coupling will cut your hands. Make sure there are no burrs on the couplings. If so, grind them off. ... 

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