Straightness And Flatness Tolerance; Blmsc Tolerances; Figure 2-4: Blmsc Straightness And Flatness Tolerances - Aerotech BLM Series Hardware Manual

BLM

2.6. Straightness and Flatness Tolerance

In order for the linear motor system (forcer and magnet track) to operate correctly, it must be
properly aligned to the bearing system travel. This section outlines the maximum permissible
deviation the motor can see during motion and still operate properly.
The straightness and flatness tolerances are the deviations from a straight line in two dimensions
during travel. There are two separate alignment tolerances: straightness (side-to-side) and flatness
(in-and-out).

2.6.1. BLMSC Tolerances

With the forcer aligned as in
either side of the forcer. The straightness can deviate left or right ±0.38 mm (0.015 in) from the
centerline. For example, a deviation can result in an 0.38 mm (0.015 in) air gap on one side and 1.14
mm (0.045 in) on the other side.
The nominal forcer height out of the track is 1.3 mm (0.051 in). The flatness can deviate up an
additional 0.25 mm (0.010 in) for a total of 2.26 mm (0.089 in) from the track edge to the forcer edge.
The flatness can also deviate down 0.25 mm (0.010 in) for a total of 1.75 mm (0.069 in) from the track
edge to the forcer edge.
Figure 2-4: BLMSC Straightness and Flatness Tolerances
46
Figure 2-4, the air gap in the magnet track is 0.76 mm (0.030 in) on
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