Boring Spindles

Boring spindles are a popular category of spindles used in numerous applications in different types of industries. They are designed to do boring in various materials and surfaces. For any type of boring whether on a small scale like boring pumps or on a large scale like boring in petroleum industry, every where boring spindles are needed. In each and every boring machine tool spindle is the most important component responsible for its performance. Boring spindles are designed for use in boring which implies the machining of an internal diameter in the workpiece.


Boring Spindle: Types

• High frequency boring spindle
• Belt driven boring spindle
• Motorized boring spindle
• High precision boring spindle

Common Spindle Problems
Often it happens that a boring spindle is used in many applications for which it was not supposed by the manufacturer. In these situations the main problem occurs is that your machine doesn't give hundred percent output according to the expectation. In that situation a little modification in design can help your spindle to achieve the target.

Other factors are also responsible for the poor performance of boring spindles. You must take care of them and avoid them to insure long running of your boring spindles.

• Operating Speed: Most boring spindles have a rated maximum operating speed mentioned on its body. Deviating from that speed may affect the performance of machine. Too fast or two slow running of a spindle always results in poor performance.
  
  
• Excessive Belt Tension: In belt driven spindles, excessive belt tension is one of the main causes for spindle failure. Belts should only be tight enough to avoid slippage. As tightening advances, it creates shaft deflection and cocks the bearing out of alignment, thus occurring in poor output.
  
  
• Contamination: During assembling and testing, cleanliness is one of the prime concern. Though we know that production conditions are not same as laboratory conditions, but some specific common sense precautions can prevent early spindle failures caused by contamination. During the use of coolant the direction of flow should be away from the Spindle Nose as much as possible.

The problems that arise by using boring spindles are of three types:

• The need for the best available seal for obstructing the external agents (fluids or solids) entry into the bearings and the consequent lubricant leakage.
  
  
• The reduction of the power formed by friction to a minimum value so as to avoid heating of the spindle, detrimental to the precision of the latter and
  
  
• Lastly, the reduction to a minimum of the external overhang of the bearings in order to increase the spindle's rigidity and, consequently, its precision.

Boring Spindle : Usage

• For boring of holes.
• For Connecting rods.
• Machining of internal diameters of objects.
• Used for deep hole grinding on horizontal and vertical boring machines, lathe machine etc.

Boring Spindle: Features
Different boring spindles have different features depending on their usage and applications. But some features are common and found in all boring spindles.

• Motorized Boring Spindles are fitted with angular contact bearings.
• The bearings are grease lubricated for long life.
• Its motor is air/ water cooled.
• These spindles are vibration and noise free.
• They produce high surface finish value on job.

Fine Boring Spindles
Fine boring is a well known technique of machining where accuracy is required together with maximum constant production.

Spindles used in fine boring are capable, under ideal conditions, of finishing machining components to limits of accuracy of 0.005 mm on size and 0.0025 on parallelism and roundness according to the material being machined, diameter and length of the boring quill. A wide range of fine boring spindles are available for use on all known makes of fine boring machines. They are extensively used on in-line transfer, rotary and special purpose machines. Each spindle is available with extended nose.