Multi Spindle

Multi spindles are today a widely demanded category of spindles for performing a wide range of machining tasks at a very high speed and at a short period of time. These type of spindles used in a machine tool consist of not one spindle but many and hence the name "multi spindle". The manufacturers are today in continuous pressure with the rise in accuracy demands and the need to produce parts complete without secondary operations. Under such circumstance, they are heading towards using multi-spindles as they are capable of producing many complex parts very quickly. A primary objective for any metal cutting machine tool is to accurately and rapidly deliver a cutting tool to a workpiece while precisely controlling its cutting action. Multi-spindles are widely used in screw machines or metal cutting machines. In recent years, a variety of machine tool manufacturers catering to high-volume applications have expanded their production by using multi spindles to machine different workpieces at once.


Features of multi spindle
Different multi spindles have different features depending upon its size, speed and application. However, some common features are described below:

• Multi spindles like a normal spindle can be motor driven or belt or gear driven.
• The spindle housing can be block type or catridge type or flange type.
• The multi-spindle capabilities can produce anywhere from 1000 pieces to millions of pieces in a machining center.
• The machines usually occupy minimum floorspace.
• Quick changing tooling.
• Designed for multiple part fixturing.
• Pre-loaded axial and radial bearing packages.
• Extreme positioning accuracy.
• The structure built for dynamic operation.
• Features different spindle combinations, like single-speed, two-speed and two-speed with stopping.
• Other features that can be included are cross drilling tools and counter spindle for back-end work.
• They provide more stability.
• The structure is so designed that they provide less thermal distortion.

Quick-change tooling in multi-spindle machines
Traditionally, multi-spindles were difficult to change-over and setup. The conventional method of changing tools on a multi-spindle involved removing the toolholder as well the worn insert to resharpen the insert. Once the worn insert was resharpened, everything was put back together by the oprator and as a last step he would typically use a dial indicator or some other gadget to relocate the center. Quick-change tooling in multi spindles eliminates this last step, thereby reducing changeover time and stretching the flexibility of the spindle.

Uses of multi spindles

• Allowing imultaneous machining of like or different parts.
• They are time saving devices.
• They provide high productivity.
• Optimum flexibility.
• Provide a flexible production system that meets long- and short-range manufacturing goals in all machining centers.
• High speed is another feature of this type of spindle.
• Multi-spindles are fast and flexible.
• They represent the epitome of efficient, high-volume production equipment for small precision turned parts.