gnenugnirpS＝LSgnenugnirpS＝LSgnenugnirpS＝LSgnenugnirpS＝LS2／LS2／LS2／LSerom rol tierom rol tierom rol tierom ro 2／LSl tiOuter diameter guideZ sideC3 levelD＋1.5Short free lengthZ side（D＋2）or moreC3 levelD＋1Long free lengthDesign the spring hole diameter by referring to the drawings above. When deflected, the OD of coil spring expands, and small spring hole diameter may cause stress concentration, which may cause breakage. On the other hand, shallow spring hole may cause friction to the OD of spring, and this may cause breakage, too. The spring hole depth should be longer than half of the unit. And a C3 chamfering around the edge of the spring hole is recommended. Z side processingAs shown in the right drawings, fixing the spring position with OD guide or ID guide is recommended.For installing ID guide on Z side and opposite side, if the movable part is long, please process the OD guide and bolt relief hole.Inner diameter guideC3 leveld−1Short free lengthOD guideD＋1.5d−1Spring guidePressurediskSpringDdDht 5ht dht ht 5（d−2）or lessC3 levelZ sided−1Long free lengthID guideOuter diameter Guide relief holeZ sideThe operation frequencies and max. deflections of coil springs in this catalog are measured at normal temperature （25℃）. And the durability will vary from different operating conditions. Lowered durability may reduce the operation frequency and constant of spring, and shorten the free length. ※The main operating conditions which will lead high temperature and low durability： ・High initial deflection condition for a long time. ・Quick operating speed（repeat speed） ・Long stroke（large difference between initial deflection and max. deflection）For the conditions above, please maintain the spring under the operation frequency shown in the catalog. ※The allowable temperature of spring is lower than the allowable temperature of spring wire. （120℃ for round wires, 220℃ for irregular shaped wires）Please use the spring under the max. deflection. And the operation frequency may differ from actual deflection. Overloaded operation will not only reduce the operation frequency or spring constant, but also cause breakage of the spring or damage of the die.Besides, solid height is the standard value; and do not use the spring near solid height. Please redesign the load or free length if necessary. When the coil spring is used under solid condition, its free length and spring constant will decrease and the operation frequency will be shortened too. Assembling the spring to the spring guide hole （or guide pin） for deflecting the free length to measure the load. This can reduce the error, and obtain the right testing result.・Standard value：Length of spring：free length÷OD≧3・Diameter of spring guide pin: ID of the spring－1mm approximately・The pressure disk with a guide hole is for safety test.Design the spring guide pin diameter according to the drawings above. If the spring guide pin diameter is large, the ID of coil spring may contact with the pin and abrasion will occur. This will lead to the spring’s eventually breaking at the tip of wear. On the other hand, small spring guide pin diameter may cause friction to the ID of spring, and this may cause breakage, too. In order to reduce the horizontal deflection of spring, the length of spring guide pin should be longer than half of the unit. And a C3 chamfering around the tip is recommended. 930Recommended measuring method for the load of long springDirection and precaution for coil springOperating temperatureallowable deflectionOthers（1）For preventing the breakage caused by repeating impact force, please set up an initial deflection.（2）The spring mounting surface should be flat, and the axes of spring should be plumb to mounting surface, in order to avoid bias load.（3）For bending prevention, a spring guide is required.（For details, refer to the drawing below）（4）In order to prevent breakage caused by foreign matter, pay attention to the operating environment.（5）For two springs using in series, bending will occur because of unstable interface. And for combined using of springs with different load, stress concentration will happen to the weaker one. As a result, the operation frequency will be reduced.（6）For nested using of two springs, the interference between the springs will cause abrasion, and breakage may happen.（7）Do not combine using with springs of other brands, in order to prevent durability from being decreased.Directions and precautions for Coil Springs
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