Top Flange
Without Centering
.31" to .70" Bores
(Hydraulic)
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Top-flange Mini Bore Clamps provide
a low-profile installation using
manifold mounting with O-ring ports.
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Manifold Mounting
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Additional Clamping Bushings, in a Clamping Set with matching Clamping Bolt and Wiper, are available as replacements or to clamp other sizes with the same base unit.
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New Item!
3600 psi max
Double Acting
FEATURES: Mini Bore Clamps provide internal clamping and supporting in one unit, exerting force both radially and downward against a hardened support surface. The top-flange version shown here allows a low-profile installation using manifold mounting with O-ring ports. Unlike Self-Centering Bore Clamps, these clamps do not perform a locating function and will not resist excessive side loads during loading or machining, so supplemental locators are required. Mini Bore Clamps are particularly suitable for clamping workpieces with small bored or cast holes and a support surface square to the hole axis. This compact design uses an expanding four-segment Clamping Bushing with teeth that penetrate slightly to exert high downward clamping force. These clamps have a pneumatic connection which can be used for continuous positive air-pressure protection in excessive chip conditions.
SIZES: Mini Bore Clamps are available in two body sizes, each with a choice of several different Clamping Bushings to cover their range of bore sizes:| | Size 1 .3071 to .4448" dia | | | Size 2 .4449 to .6969" dia |
One Clamping Bushing is included with each Mini Bore Clamp and additional sizes or replacements can be ordered separately as a Clamping Set (Clamping Bushing with matching Clamping Bolt and wiper).
CLAMPING ACTION: Mini Bore Clamps are a combination of a double-acting pull-type cylinder and a four-segment bushing which is pulled by a tapered clamping bolt. This causes the bushing to expand radially by spring force to the bore diameter of the workpiece. The simultaneous axial movement forces the workpiece downward onto the hardened support surface of the housing. Downward clamping force is proportional to operating pressure, while radial force is not dependent on operating pressure.
MOUNTING: Fasten clamp with four socket-head cap screws. A dowel-pin hole is provided on the bottom side of the flange for accurate location (+/-.002"). For manifold mounting, the mounting surface must be ground flat to ensure proper O-ring sealing.
FLUID CONNECTION: Use the two larger manifold ports underneath the flange, S for clamping, E for unclamping by installing the two CLR-3000-342-SW O-rings furnished. These clamps also have two smaller manifold ports for air connection – one marked A for using the pneumatic seat check, and another marked L for continuous positive air-pressure protection against chips. To use one or both of these ports, install the CLR-3000-876-SW O-rings furnished. Do not use NPT fittings.
DESIGN CONSIDERATIONS: These clamps do not perform a locating function and will not resist side loads except by the static-frictional force between the workpiece and support surface, so supplemental locators are required (hole-position accuracy must be within +/-.008"). Clamping force depends on the Clamping Bushing's teeth penetrating slightly and penetration depth will vary depending on the material. Heat treated or hard-coated materials cannot be effectively clamped. The hole to be clamped should not be tapered more than 3°, especially with harder materials (if in doubt, we recommend a clamping test). For best results, air-blast clean the support surface and clamping bushing before every load cycle. In excessive chip conditions, the continous positive air-pressure feature should be used. Clamping Bushings should be replaced after 10,000 clamping cycles.
CONSTRUCTION: Body > Steel. Piston, workpiece support, Clamping Bushing, and Clamping Bolt > Steel, case hardened. |
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