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- قسمت پایین فک متحرک که دائما در تماس می باشد ساییده می شود.
- یکنواخت نبودن عمل خرد کردن به علت شیب موجود بین دو فک
- دانه های بلند و نازک می توانند از این دستگاه بدون خرد شدن بگذرند.
- در هر سیکل آن عمل خرد کردن دانه ها فقط در حالت رفت انجام می شود و در موقع برگشت فک متحرک هیچ عملی صورت نمی گیرد،لذا نیمی از انرژی هدر می رود.
![whatsapp](/images/whatsapp.png)
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