What happens if we install the IncOder with an air gap bigger or smaller than the stated axial tolerances?

Resolution, repeatability & linearity will be as specified, provided gap is within 1.10+/-0.35mm (Midi IncOder). Within limits, the IncOder’s measurement resolution and repeatability are independent of air gap. If the air-gap tolerance is increased from ±0.35mm to ±0.50mm the quoted measurement non-linearity will double. For example, if a 250mm IncOder has an air-gap tolerance of ±0.50mm the quoted linearity will increase from +/-40 arc-seconds to +/-80 arc-seconds.

IncOders will continue to work with a gap of several mm. An error signal is generated when the maximum or minimum operating distances are exceeded. The specified gap tolerances are most easily achieved using Set Screw or Shaft Clamp Rotors. Alternatively the required gap may be maintained by the use of a shim – see IncOder Product Accessories.

For Mini, Shaft and Ultra installation parameters, please refer to the relevant IncOder product guide.