Royal S-Type Master Collets

Information about Master Collets & S-Type Pads for Low-Profile Collet Chucks

• For low-profile collet chucks with a capacity greater than 1-3/4″, a master collet and pad arrangement is typically used instead of dedicated solid collets. The primary reason for this is to reduce operating costs for the customer collet pads are less expensive than large solid collets.

• Royal low-profile CNC Collet Chucks utilize proprietary master collets that accept industry-standard S-type collet pads.

• These S-type pads are available hardened and ground to a specific size, or in the soft state which enables them to be machined to size by the customer.

• The pads attach to the master collet via special clamp screws. As a clamp screw is tightened, the opposing ends draw together, engaging a dovetail on the back of the collet pad and seating it securely in the master collet.

• All Royal Accu-Length S-Type CNC Collet Chucks include a master collet with multiple keyways for fine adjustability a feature that is especially useful on subspindle applications.

• S-type master collet and pad assemblies are usually less accurate than a hardened and ground solid collet due to the tolerances of the pad/collet interface. S-type pad manufacturers usually state an accuracy in the range of 0.002″ 0.005″ TIR.
  – For first operation work, this accuracy is fine because all surfaces that are turned in the same chucking will always be concentric to each other.
  – For second-op and sub-spindle applications where accuracies of 0.0005″ TIR or better are required, we recommend either boring a set of soft pads to size, or ordering one of our custom-made hardened and ground solid collets.

• All Royal S-type CNC collet chucks include one master collet and one set of pad clamps.

• Many shops keep an extra master collet on hand so they can install the collet pads for the next job ahead of time, reducing setup changeover times.

• All Royal master collets designed for our Low-Profile Accu-Length chucks include an internal thread to allow for the use of a part stop or ejector.

• Royal master collets are designed for use with Royal CNC collet chucks, but may also fit other chuck brands. Please contact a Royal applications engineer for additional information.

An Important Note About Royal Master Collets

• Royal Products is unique due to the fact that we design and manufacture all of our own low-profile master collets in-house. Having 100% control over the quality, delivery, and pricing gives us a significant advantage over our competitors who must purchase their master collets from outside sources and mark them up before reselling them to you.