This unit shown in Figure 15.38 is a cantilevered hydraulic-powered dresser with three sleeve bearings for radial stiffness and two ABEC 7 thrust bearings for axial stiffness. It is a unit designed for heavy-duty plunge-dressing applications on internal grinders. Rolls can be counterbored to wrap around the spindle to accommodate up to 3 roll widths. This type of layout reduces the cantilever overhang and reduces deflections.
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FIGURE 15.39 HO 5/8 hydraulic dresser spindle. |
15.17.5 DFW-HO Five-Eighths H eavy-Duty Hydraulic Spindle Typically Used for Centerless Wheels
This unit, shown in Figure 15.39, is an outboard-supported heavy-duty traversing spindle with zero end-play. The outboard support greatly increases the stiffness of the design compared with a cantilever layout. The unit has three sleeve bearings and four thrust bearings with coolant porting for thermal stability. The roll is replaced by removing the end cap where the diamond roll is bolted to a face plate. The dresser is typically used for flat form dressing centerless wheels mounted cross-axis or uniaxially to dress forms and radii. Centerless wheels are wide compared to wheels for most other grinding processes and, therefore, require a heavy-duty spindle.
15.17.6 DFW-HO Variable-Speed Hydraulic Dresser
The unit, shown in Figure 15.40, is a variable speed, outboard-supported light-duty plunge dresser with pressure-lubricated sleeve and thrust bearings with easy removal of the dresser shaft from the housing for roll replacement. Coolant porting is supplied custom to each unit for the dressing process. The variable speed capability allows a variety of dress conditions for very different wheel grades or diameters.