1）螺紋加工程序段中指令的螺距（導程）值，相當于以進給量（mm/r）表示的進給速度F，如果將機床的主軸轉速選擇過高，其換算后的進給速度（mm/min）則必定大大超過正常值；
2）刀具在其位移的始/終，都將受到伺服驅動系統升/降頻率和數控裝置插補運算速度的約束，由于升/降頻特性滿足不了加工需要等原因，則可能因主進給運動產生出的“超前”和“滯后”而導致部分螺牙的螺距不符合要求；
3）車削螺紋必須通過主軸的同步運行功能而實現，即車削螺紋需要有主軸脈沖發生器（編碼器）。當其主軸轉速選擇過高，通過編碼器發出的定位脈沖（即主軸每轉一周時所發出的一個基準脈沖信號）將可能因“過沖”（特別是當編碼器的質量不穩定時）而導致工件螺紋產生亂扣。
因此，車螺紋時，主軸轉速的確定應遵循以下幾個原則：
1）在保證生產效率和正常切削的情況下，宜選擇較低的主軸轉速；
2）當螺紋加工程序段中的導入長度δ1和切出長度δ2（如圖所示）考慮比較充裕，即螺紋進給距離超過圖樣上規定螺紋的長度較大時，可選擇適當高一些的主軸轉速；
3）當編碼器所規定的允許工作轉速超過機床所規定主軸的轉速時，則可選擇盡量高一些的主軸轉速；
4）通常情況下，車螺紋時的主軸轉速（n螺）應按其機床或數控系統說明書中規定的計算式進行確定，其計算式多為：
n螺≤n允／L（r／min） 式中n允—編碼器允許的工作轉速（r／min）；
L—工件螺紋的螺距（或導程，mm）。
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