Hallo, look at the picture quickly: http://www.skf.com/skf/productcatalogue/jsp/viewers/tableViewer.jsp?tableName=1_3_t3&maincatalogue=1&lang=en
the left side picture is normally the situation when there is a big nut on the shaft to hold the bearing in place. This nut either has a counter-nut to lock it or it is of a special construction so it can be secured. If this is the case then make sure the nut-face that holds the brearings is perfectly flat and square. The right picture is the case when the outerrings need compressing by a specially made ring (again perfectly flat and square). The shaft locknut does not need to be quite as perfect in that case. In both cases the object of the exercise is to close the natural gap between the rings. This will give the bearings just the right preload. j. On Wed, Nov 2, 2011 at 6:02 PM, Bruce Klawiter <bmkl...@yahoo.com> wrote: > I bought new bearings for the ball screws on my mill, SKF 7204 BECBP. > > http://www.skf.com/skf/productcatalogue/Forwarder?action=PPP&lang=en&imperial=false&windowName=null&perfid=123002&prodid=1230020204 > > I have read conflicting information on how to install them. > It appears the best way would be installing them back to back, but I have > read the inner rings should be clamped tight and also read the outer rings > should be clamped tight when there back to back. > > I am not sure I understand the proload either and can't decipher what it > is form the SKF website. > > This is what I think I need to do, find what the preload is (weight) and > measure the defection of the outer race when this weight is placed on the > bearing. > > Take this measurement X 2 and shim between the the races of the two > bearings and clamp tight the inner rings and I will have the correct > preload. > > Do I have this right. > How do I find the preload > > Your help is greatly appreciated, > Bruce > > > ------------------------------------------------------------------------------ > RSA® Conference 2012 > Save $700 by Nov 18 > Register now! > http://p.sf.net/sfu/rsa-sfdev2dev1 > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ RSA(R) Conference 2012 Save $700 by Nov 18 Register now http://p.sf.net/sfu/rsa-sfdev2dev1 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
