Part 2: Crest Factor
振動將影響各種產品表面粗糙度及精密程度，然而突然衝擊(Impulse)是一個產品精密程度和製造品質的最重要因素。在工具機產業中，衝擊主要來源有變速箱、馬達、主軸內軸承損壞，工具機廠商目前只利用加速度的RMS(俗稱G值)來評估振動大小，近似表示出一段時間內振動動能，但容易產生盲點，忽略衝擊的現象，Visual Signal利用Crest Factor(CF值)表現衝擊訊號與RMS比值，利用RMS與Crest Factor將更完整了解主軸及軸承品質。
旭泰精密機械與逸奇科技合作，由圖形清楚了解主軸性能以及工作範圍內G值及CF值變化，旭泰精密藉G值粗略掌主軸整體品質，CF值顯示衝擊大小。下面第一張圖是較佳的主軸，第二張是有缺陷的主軸，量測主軸加速振動，較佳主軸在加速過程，CF值大約保持5倍的G值，缺陷主軸的CF值大約為G值得10到15倍，表示缺陷主軸的衝擊訊號較明顯，可能軸承或組裝的問題
>>下一期即將討論 Part 3: Bearing Defect (評估軸承撞擊產生之頻率)
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