1A2A0530030420620220020710810620030420020220810710510610410310620220420020810610710510310410210110020810610710510310410210110900106105104102103101100109553053503003542042062562522022502002571581053003562062503542022042502002522581071081571551561541003531042062022462002422071081442402061481041051461031471451431441421042062411022002402071081481061461041051471451031431021441421011411490024010814610610714510514410310414210214314110114010900149514563503523582562004053013072092052032022043082003062042012022002081091071072092052032002012091071081061051041522502581591571551561541531511521（1）（2）※ is the range of height in stage ②, and ※ is the range of height（③④⑤）, and safety value is added to the height in ④⑤. For details, refer to the serial numbers in the column of lower limit.※In consideration of the changeability for components and operating condition, the height increment of bottom dead centre is 5mm.How to selecttHH tHTHLLHH5555533355553333333HL455555333333HLLH4455553333345553333L45555533333HHL445555433333HLLHLH4455553333344555333445533liteS tsoP eduG redoH rof stnenopmoC240220200180160140120100806040LowerlimitHt240220200180160140120100LowerlimitHt The height at bottom dead centre H is the length between the bottom of guide post holder and the mounting surface of guide bushing（＝Die height－The thicknesses of upper and lower punch plates）2602402202001801601401201008060LowerlimitHt300280260240220200180160801406012040100LowerlimitHt300280260240220200180160140120100LowerlimitHtLowerlimit340320300280260240220200180160140LowerlimitHt340380320360300340280320260300240280220260200240180220160200140180LowerlimitHtHtPunch holderRam of punching machine380360340320300280260240220200180LowerlimitHt400380360340320300280260240220200LowerlimitHtTo sum up, the heights at bottom dead centre（H）are listed in the table below , and colored part is recommended. For contact prevention between the tip of guide post and other components, please calculate A1, A2 according to Ht listed in the table.Movable stopperD20Fixed stopperD25 are standard range of application. Select the appropriate length of guide post according to the height at bottom dead centre H and diameter of guide post decided by die design.Look up the overall height of guide post Ht from the table, and then calculate the clearances A1, A2 with other components, in order to confirm the tip position of guide post.D25D32 is the range of height ±5mm in stage ①. D32D38D38D50The clearance with punch holderThe clearance with ram of punching machineD50D601027The consideration of tip contactA stopper is included in the ball bearing guide post set, which enables the overall height （Ht） higher than the guide post. Avoid contact between the tip of guide post and other components at the bottom dead centre. In the right drawings, A1, A2 are clearances, and the safety value should be considered before the selection of guide post. The clearance with punch holder A1＝H－Ht The clearance with ram of punching machine A2＝（H＋T）－Ht （T：The thickness of upper punch holder）Conclusion
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