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Techno Linear Motion Catalog 15 Technical Information                                    Compression Load vs. Length                         For Standard Ball Screws and ACME Screws                     COLUMN LOADS MAXIMUM LENGTH (IN.) ADJUSTED FOR BEARING SUPPORT “X” DIMENSION PURPOSE This graph was designed to simplify the selection of the proper lead screw so as to avoid buckling when subjected to the axial loading by means of the nut.  The factors which can be controlled after a particular maximum length is determined are:  method of bearing support and choice of lead screw diameter. USE OF THE GRAPH 1.  Choose preferred bearing support means, based on design considerations. 2.  On the proper bearing support horizontal line (A, B, C or D) choose length of lead screw. 3.  Draw vertical line at the lead screw length, determined at (2.), and draw a horizontal line at the compression load the unit is exerting on the screw. 4.  All screw diameters to the right and above the intersection point in (3.) are suitable  for this application. 5.  Screw sizes are coded as follows: Diameter (in) Threads / in Starts 75101 75061 62081 62101 62102 50101 75081 43082 43084 37161 37081 37101 37121 31082 81084 31122 37122 37084 25161 40000 30000 20000 10000 8000 6000 4000 3000 2000 1000 800 600 400 300 200 100 ONE END FIXED OTHER END FREE REF A REF B REF C REF D 5 10 14 20 10 20 28 40 15 30 42 60 20 40 57 80 25 50 71 100 30 60 85 120 INCHESINCHES INCHES INCHES INCHES BOTH ENDS SUPPORTED ONE END FIXED OTHER END SUPPORTED BOTH ENDS FIXED LENGTH