High-resolution error separation technique for in-situ straightness measurement of machine tools and workpieces
✍ Scribed by C.James Li; Shengyi Li; Jianming Yu
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 415 KB
- Volume
- 6
- Category
- Article
- ISSN
- 0957-4158
No coin nor oath required. For personal study only.
✦ Synopsis
A new Optimum Error Separation Technique (OEST) method is described for in-situ measurement of straightness of a workpiece without an accurate instrument datum, i.e. without a precise guideway. The goal is to alleviate the deficiencies of the traditional sequential-two-point method (STP) and the sequential-three-point method (STRP). These state-of-the-art techniques must use a sampling interval equal to the sensor spacing which has to be larger than the diameter of the sensors. Such a large sampling interval renders the STP and STRP useless for short workpieces. The new method is established by extending a multi-probe Discrete Fourier Transform (DFT) based roundness measurement method. The aperiodic nature of straightness measurements, which makes the use of DFT inappropriate, is remedied by a numerical search scheme which corrects those data points affected by this limitation. The results of computer simulations and measurement experiments show that this new method is a very good one for short workpiece straightness measurement in an ultra-precision diamond turning lathe.