Multi Spindle Bar Automatics

Multi Spindle Bar Automatics

Multi Spindle Bar Automatics - Because of bar loading limitations, multi spindle bar automatics are horizontal spindle machines, having from four to eight workspindles of from 15 mm to 120 mm capacity. Instead of the tools being mounted in a revolving turret; on this machine, the spindles are mounted in a turret called a spindle carrier

Each spindle carries a bar of material. The end working tools are mounted on a reciprocating slide. Cross slides are also provided for profile work and stock cut off. One machining stage is performed at each spindle position, and each workpiece passes consecutively through all positions, I to IV.

Method of Multiple Spindle Turning on a Four Spindle Machine

Thus, one revolution of the spindle cylinder (carrier) is required to machine a workpiece, if the automatic has one loading position. To explain further, in multispindle automatics, the work is divided so that a portion of it is performed at each of the several (say, 4, 5, 6 or 8) stations or positions simultaneously, thereby short terming the time required to finish one part.

Each time the tools are withdrawn and the spindle carrier indexes one station, a finished workpiece is, cut off and a new piece is started. Bars of stock are loaded into each spindle when it has been indexed, to the first position. It automatic stock feeding is used, it is done in the lower spindle position at the rear of the machine.

In operation, the spindle carrier is indexed by steps to bring the bar of stock in each of the work spindles successively in line with the various tools held on the tool slides. All tools in the successive positions are at work OD different bars at the same time. Multispindle bar automatics are intended to produce parts from bar stock of different profiles.

Performed oil the machine are the following operations:

(i) Rough, finish and form turning

(ii) Facing,

(iii) Drilling and reaming,

(iv) Boring, counter boring and countersinking,

(v) Cutting internal and external threads, etc.

In place of collet when multi spindle automatics are provided with hydraulic or air operated chucks for holding individual pieces, the machine is known as Multispindle automatic chucking machine. It is similar to multiple spindle bar automatic except for the stock holding equipment.