Hydraulic, Fixed Clamp Height, Sliding Style C Clamp “C” Clamps work in similar applications to PFA’s fixed height ledge clamps, but provide a different profile and customer preference. Using small Bolt-on guides, these clamps also work well in “slotless” press applications (bolsters with threaded holes only). Also, by reaching under and over the clamping plate and providing multiple ports, the clamp can be set “deeper” over the plate if needed, resulting in a lower installed profile. Available in the single piston style Model 283 and double piston style Model 283D, “C” clamps require only 1.25” to 1’ of die plate engagement, respectively, and may be modified at the nose to engage plates that have been pocketed to match clamp heights.
Ledge brackets, bars, or ears may also be added to dies in some applications to accommodate the clamps. Clamp model and quantity should be selected to provide a total clamping force greater than the total (static and dynamic) force applied to the system during use. Clamp sizing is done to provide a minimum .060” clearance to the clamp plate and accommodate a wide range of slot neck height and clamp plate height combinations. For a given T-slot neck depth (N) and clamping plate height (CLH) the needed part number can be easily determined.