Dimac Tooling, Australia and New Zealand’s leading supplier of accessories and workholding solutions for CNC milling and CNC turning machine tools, is the sole distributor of Royal CNC Expanding Mandrels.
“ID Gripping is often overlooked as a workholding option, yet in many situations it is the best choice,” said Dimac Managing Director, Paul Fowler.
“The workholding challenge, especially on short parts, is to have sufficient surface area to securely hold the part, have an area that will not be damaged by gripping the ID and still allow for maximum access for the cutting tool.
It is becoming increasingly important for surface finishes, especially in medical applications to have no marks or blemishes. Gripping on the ID of a bore rather than the OD can help keep the outside cosmetics of a workpiece more acceptable for these types of applications,” Mr Fowler went on to say. The ability to choose ID clamping offers several advantages over simply using traditional OD gripping with a chuck or collet.
Firstly, by having the ability to clamp on the center bore it allows for full access to the entire length of the workpiece so all external surfaces can be turned in a single operation guaranteeing perfect concentricity.
On sub-spindle machines, ID gripping on the second spindle eliminates the risk of surface damage that can be caused by second-op OD gripping on a previously turned diameter.
For many parts, the engagement length of the ID bore can be greater than what is available for OD gripping, resulting in superior rigidity and torque transmission
ID systems tend to be more streamlined than OD systems, enabling better part access – especially important for use on machines with live tooling.
And finally, having full access to the entire outside length can aid production shops trying to balance cycle times between operations performed on the main spindle and the subspindle.
Royal CNC Expanding Mandrels manufactured in the USA, are finely crafted tools, incorporating the highest quality steels and seals. They’re fully sealed for complete protection against coolant and chip penetration.
Royal’s exclusive ‘Bolt & Go’ mounting feature is standard on all Royal ID Gripping systems and enables quick mounting and ensures maximum accuracy and rigidity. The unique double-angle design ensures positive release when the part is unclamped – especially important for automated loading/unloading.
In addition to the off-the-shelf standard line, specials are available in custom configurations ranging up to 610mm diameter.
Manufactured to exacting tolerances, Royal Expanding Mandrels are guaranteed accurate to +/- 0.0012mm TIR or better.
The Royal CNC Expanding Mandrels system includes all mounting hardware, wrenches and a custom–machined drawtube connector to ensure hassle-free installation.
Dimac has over 30 years experience in CNC machine tool accessories and are agents for many highly respected brands such as Kitagawa, Cooljet, Reven and Eron. The company also manufactures soft and hard jaws in their own CNC equipped machine shop.
“Like all the products we sell, Royal CNC Expanding Mandrels have the full back up and support of Dimac technical personnel to ensure the product operates at optimum performance,” Mr Fowler concluded.