| 摘要 |
<p>A portable grinding machine for grinding a surface surrounding a circular aperture, the machine consisting in a body (13) having adjustable legs (11) to locate and fix the body in the circular aperture by contact with an internal surface of the aperture, a grinding wheel (21) supported on a shaft (24) projecting radially from the body, a motor (15) simultaneously rotating the body and reciprocating the shaft to cause the grinding wheel to traverse the surface to be ground with a combined rotary and reciprocatory movement.</p> |
