EVALUATION OF DYNAMIC SPINDLE RUN OUT ABILITY OF SELF-CALIBRATABLE ROTARY ENCODER |
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| Tsukasa Watanabe, Yohan Kondo, Hiroyuki Fujimoto |
- Abstract:
- SelfA (Self-calibratable Angle device) encoder is an epoch-making encoder with the angular error self-calibration function. SelfA encoder, which has the structure of arranged several sensor heads around the scale disc at the equal angular interval space, by analyzing the angle signal from each sensor heads output in one revolution, can detect several angular error factors, not only angle scale error but an attachment error (eccentricity error). Because SelfA can carry out this self-calibration analysis after attached to the axis shaft of the apparatus, even if measurement condition changes, the people can use the encoder keeping the same angle accuracy. The SelfA encoder can achieve angle accuracy more than 0.1" by this function.
In this SelfA study, we find out that there was slight difference between the output angle signals in each SelfA sensor heads, furthermore, understand the slight difference is generated from axis shaft run out of the apparatus.
In order to estimate the ability of run out detection function of SelfA encoder quantitatively, we developed an axis run out generating device and carried out the experiment. In this experiment results, SelfA can detect dynamic RRO (Repeatable Run Out) and (NRRO: Non Repeatable Run Out) with very high sensitivity of accuracy about 50 nm level. - Keywords:
- spindle, run out, angle, self-calibration, rotary encoder
- Download:
- IMEKO-TC14-2014-68.pdf
- DOI:
- -
- Event details
- IMEKO TC:
- TC14
- Event name:
- TC14 LMPMI Symposium 2014
- Title:
11th Symposium on Laser Metrology for Precision Measurement and Inspection in Industry
- Place:
- Tsukuba, JAPAN
- Time:
- 03 September 2014 - 05 September 2014