Palibe kukwera kwa kutentha: kutentha sikudzawonjezeka pamene zipangizo zimaphwanyidwa pansi pa ntchito yowonjezera pneumatic ndi kutentha kwa mphero kumasungidwa bwino.
Jet Mill yomwe imagwiritsidwa ntchito mu Labu, yomwe mfundo yake ndi : Yoyendetsedwa ndi mpweya woponderezedwa kudzera mu majekeseni odyetsera, zopangira zimafulumizitsa kuti akupanga liwiro ndi jekeseni mu chipinda champhero mu tangential malangizo, anagundana ndi grinded mu tinthu.