Roemheld CLR-4317-110-VS | 15.9 to 21.9mm Range Self-Centering Bore Clamp

Roemheld Self-Centering Bore Clamps

Self-Centering Bore Clamps provide locating, internal clamping, and supporting in one unit, exerting force both radially and downward against a hardened support surface. This compact design uses an expanding Segmented Clamping Bushing to exert high clamping force with self-centering repeatability within .0002". These bore clamps are particularly suitable for clamping workpieces with machined bored holes and a support surface square to the hole axis.

Application Information

These Bore Clamps exert force both radially and downward against a hardened support surface.

Clamping Action

Self-Centering Bore Clamps are a combination of a double-acting pull-type cylinder and a segmented bushing which is pulled by a drawbar over a fixed cone. This causes the segmented bushing to expand radially 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 and will vary somewhat depending on the friction coefficient within the bore.

Design Considerations

Do not exceed the maximum operating pressure listed for the bore-diameter range or this will damage the drawbar. Avoid repeated clamping without the workpiece in place because this strains the vulcanized segment joints. Maximum operating temperature for the segmented bushing is 175°F.

Mounting & Fluid Supply

Bore a locating hole in the fixture plate for the housing's bottom locating post. Fasten with four socket-head cap screws.

With the Bore Clamp unclamped and the drawbar's lock nut removed, screw the end plug of the Segmented Clamping Bushing onto the drawbar. Check the bushing's diameter with a caliper and continue turning until the diameter is .004 to .008" less than the clamping diameter, to allow easy loading of the workpiece. Secure with the lock nut.

Two 1/4" BSPP ports, A for clamping, B for unclamping. For optional manifold mounting, use the A and B manifold ports underneath the clamp by unscrewing the sealing plugs. Do not use NPT fittings. These clamps also have a 1/8" BSPP port marked M for air connection when using the pneumatic seat check.

Material

Parts Specification

Warning:

This product can expose you to materials and/or chemicals including arsenic, lead, and other materials and/or chemicals which are known to the state of California to cause cancer and/or reproductive harm.

For more information, visit www.P65Warnings.ca.gov