Measurement facility

Coordinate Measuring Machine (CMM)

Coordinate measuring machine (CMM) is a 3-D measurement system designed and developed for magnetic field mapping and fiducialisation of large size dipole magnets of Indus-2. The system incorporates three orthogonal granite slides, floating on air bearings, driven by DC servomotors and data acquisition system. Hall probe is used for field mapping where as an electronic switch (touch probe) is used for physical axis transfer. The 3-cordinate system named “3-D Magnaflux” has granite slides with strokes (x,y,z) of 3m x 0.8m x 0.6m in three orthogonal planes. The slides float on air-bearings and are driven by independent servomotors coupled to linear friction drives. Incremental non-contact optical encoders with position feedback, controls the machine. The complete system is PC controlled with provision to operate it in manual mode through joystick pendant and in auto-mode as programmed. The position and corresponding field values are acquired simultaneously for analysis. Omni directional sensitive electronic switch provided a touch trigger for the position. Y-slide of the system carries a non-metallic adopter where the Hall probe and trigger probe are connected. Dedicated PC-programs are used for both probe scanning and data (field and position) analysis to give field-strength, effective magnetic length, mid-plane and field quality. Table 1 gives the specifications of CMM. Schematic layout of CMM machine is shown in figure 1. Figure 2 shows the photo of CMM.

Table 1: Basic specifications of coordinate measuring machine (CMM)