Sensor Mounting Pads -- "Blocking"
When using a triaxial accelerometer, it is extremely important that it be installed in exactly the same location each time the data is collected, and also that it be oriented in the same direction. One way of assuring this is to use permanently affixed mounting blocks on the machine.
The cylindrical mounting block, or "pad", is a bronze disc with a central tapped hole and a key way at the edge that receives an indexing pin on the transducer itself. The transducer that is sensitive along the axis of the mounting screw is channel No. 1, the axis in the direction of the key way is channel No. 2, and the axis perpendicular to this is channel No. 3. The pad is normally attached to the machine with a hard, strong adhesive such as Versilok ä type 204 structural adhesive.
As was mentioned above, it is very important that the orientation of the block is known by the software, and if a block is replaced, the new one must be oriented in the same direction. The VTAG states the proper orientation of each block. The installation of the mounting blocks is sometimes referred to as "blocking" a machine.
Sensor Mounting Pad
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