1 Always select the largest spindle that will fit your particular space and comply with the speed requirements. This will give you the maximum spindle stiffness and longest life.

2 Keep tool overhang to a minimum, particularly when boring, end milling or non-supported arbor milling. As you move farther from the spindle bearings, bearing loads increase and spindle stiffness decreases. Use the specification charts to find the maximum overhang distance.

3 When boring, the spindle nose bearing I.D. should be as large or larger than the hole being machined.

4 To minimize any shaft or bearing loading, keep within the maximum torque rating given on the specification charts.

5 Consider the environment in which the spindle is used. If the conditions are dusty, air purging is recommended. If there is heavy coolant or chips, it is advisable to supply a deflector cover to keep coolant or chips from directly attacking the spindle. Contact seals should be used unless speed requirements do not allow.

6 Specify the correct bearing arrangement. For mostly radial loaded applications, use a bearing pair at the nose end. For high axial loads, combination axial and radial loading or heavy or interrupted cuts, use a triplex bearing set at the nose end.

7 SKF Precision Technologies’ engineering and sales staff is always available to help select the correct spindles for your applications. When asking for assistance, please supply the following information:
a) Type of operation and stock removal amounts
b) Tooling description
c) Part material specification
d) Spindle orientation
e) Environmental conditions
f) Space limitations
g) Horsepower and RPM required

Whenever possible, supply a part print along with any other information that may be useful in spindle selection.