| 摘要 |
<p>A guideway (10) of a guideway set in a coordinate measuring machine has a scale in the form of a metal strip clamped and bonded to an accessible face (46) of a spar (30), the latter being formed of a thermally stable material and being connected at one end to a reference position defined by a bracket (18) and a mounting plate (16) on the guideway (10). The spar (30) is mounted on the guideway (10) by spaced blocks (34) which are designed to accommodate any longitudinal movement of the guideway (10) due to thermal expansion, so that the spar (30) and the scale are effectively maintained in position. Because relative movement between the spar (30) and the scale is substantially prevented, the position of the scale is substantially fixed, providing improve scale accuracy.</p> |
