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The Gleason UNI-SPAND® Gear Arbor has been designed primarily for holding ring-type automotive rear axle drive gears while performing a manufacturing operation. Its outstanding advantages include speed and convenience of loading and unloading, free movement of the gear on the dechucked arbor, positive, accurate clamping and centering of the gear, and long wear life, due to the expandable compensating locating surface of the UNI-SPAND® spring unit.
Simplified Design
A single circular, disc-type expandable spring and a concentric precision ground pilot bushing work together to provide an accurate centering and clamping assembly. Sealing against foreign matter is provided to protect the movable working parts.
Long Life
Extensive production runs in gear manufacturing applications have shown that UNI-SPAND gear arbors have long wear life. Their design provides a .015" to .020" wear allowance on the gear-centering outside diameter before repair is needed. This is an especially important feature in automotive gear lapping applications. Proper periodic arbor maintenance is required for best wear life.
Minimal Repair
The single circular, disc-type spring design permits easy disassembly and maintenance. Both the UNI-SPAND spring and the pilot bushing can easily removed from the front of the arbor assembly, even while it is mounted in a machine spindle. A supply of interchangeable replacements for the parts subject to wear further reduces down-time when their repair or replacement eventually becomes necessary.
Features
The Gleason UNI-SPAND Gear Arbor is a fast-acting, positive and accurate clamping and centering arbor with long wear life. Its design is ideal for automatic loading applications, as it can be supplied with a clearance allowance for loading gears onto the arbor and with a blank-seating
arrangement to prevent the machine from operating until a gear blank is mounted and squarely seated providing that the machine has such an arrangement.
When the expander is pulled back by the machine's chucking operation, it compresses the one-piece circular, disc-type expandable spring, causing it to expand radially within the gear bore diameter to both center and grip the gear. Positive pull-back of the gear against the arbor mounting surface results from movement of the pre-loaded pilot bushing in conjunction with that of the UNI-SPAND spring. The positive pull-back of the centering-clamping action of UNI-SPAND arbors work together to assure maximum control of the gear in all applications.
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