根据工作所需力的大小来确定活塞杆上的推力和拉力。由此来选择气缸时应使气缸的输出力稍有余量。若缸径选小了，输出力不够，气缸不能正常工作；但缸径过大，不仅使设备笨重、成本高，同时耗气量增大，造成能源浪费。在夹具设计时，应尽量采用增力机构，以减少气缸的尺寸。
下面是气缸理论出力的计算公式：
F：气缸理论输出力(kgf)
F′：效率为85％时的输出力(kgf)－－(F′＝F×85％）
D：气缸缸径(mm)
P：工作压力(kgf／cm2) 
例：直径340mm的气缸，工作压力为3kgf／cm2时，其理论输出力为多少?芽输出力是多少? 
将P、D连接，找出F、F′上的点，得： 
F＝2800kgf；F′＝2300kgf 
在工程设计时选择气缸缸径，可根据其使用压力和理论推力或拉力的大小，从经验表1－1中查出。 
例：有一气缸其使用压力为5kgf／cm2，在气缸推出时其推力为132kgf，(气缸效率为85％)问：该选择多大的气缸缸径? 
●由气缸的推力132kgf和气缸的效率85％，可计算出气缸的理论推力为F＝F′／85％＝155(kgf) 
●由使用压力5kgf／cm2和气缸的理论推力，查出选择缸径为63的气缸便可满足使用要求。

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是一丛秋菊，也要散发芳香；是一片秋叶，也要装点大地；是一株古柏，也要撑起蓝天；是一眼古井，也要流出清泉。
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冬天的河干涸了，我相信，春水还会来临，那时白帆就是我心中的偶像；风中的树叶凋零了，我相信,泥土里的梦将在枝头开花结果。
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