Belt Driven Grinding Spindles

Belt driven grinding spindles are suitable for a wide range of grinding applications. They are available in a wide variety of size, load and speed requirements, suitable for high-speed grinding. Belt driven grinding spindle units are usually found in machining centers, heavy-duty machine tools and lathes where cost issues are crucial. They are used for grinding operation for small, medium & large diameter bores. The belt-driven grinding spindle operates with a tangential belt drive system. These spindles are available with belt of various sizes.

Features of belt driven grinding spindles
Some common features available in these spindles are as follows:

• These belt-driven spindles are generally designed with for-life lubricated precision bearings.
  
  
• All belt driven grinding spindles are dynamically balanced.
  
  
• Highly efficient seals protect the grinding spindles from grinding fluids, chips and other contaminants.
  
  
• In most belt driven spindles, sealing air connection and oil-mist lubrication are available for particularly high speed applications.
  
  
• They meet individual or industry-standard clamping systems.
  
  
• Mostly these belt driven grinding spindles are grease lubricated for durability. But other options like oil mist, oil jet and oil dipped lubrication spindles are also available.
  
  
• Spindles nose and shaft are usually with ground threads.
  
  
• Bearings used are of angular contact bearings or equivalent.
  
  
• These belt driven spindles can be mounted on bore grinding machines and tool post grinders of lathe machine.

Varieties of belt driven grinding spindles
The different varieties are as follows:

• With inner cylinder for screw-in mandrels.
• With male taper for grinding wheel flanges.
• With male taper and stepped spindle housing.
• With male taper and special springs and bearings.
• With female taper.
• Tooth-flank grinding spindles etc.

Uses of belt-driven grinding spindles
Belt driven grinding spindles are preferred for the following reasons:

• Suitable for grinding particularly deep holes which cannot be ground with any other spindle type.
  
  
• They are ideal for light and heavy external grinding operations.
  
  
• They are suitable for deep holes where diameters are at times wider than that of the spindle.
  
  
• The large number of screw-in mandrels in such spindles allows an optimum adaption to every bore grinding task.
  
  
• There are some belt driven spindles which permit grinding at speeds which could only be achieved by electric grinding spindles.
  
  
• They provide a considerably higher accuracy.

Applications of belt driven grinding spindles
Belt driven grinding spindles are used in the following:

• Bearing and automotive components.
• Universal cylindrical grinding machines.(Tool room)
• For ferrite grinding. Dressing.
• For center less grinding.
• Optical lenses grinding.
• For automatic polishing machine.
• For testing machines in automobile industries.
• Grind rough stock, such as forgings
• Light and heavy internal grinding.
• Light and heavy external grinding
• Grinding deep holes
• Grinding in high speed
• Tooth-flank grinding etc

Buying tips Parameters to consider are as follows: Speed: Maximum and minimum power, torque, & rotation. Bearings: Tapered roller bearings, angular contact ball bearings are few different types of bearing constructions used to optimize belt-driven spindles for specific applications. Balance: All belt-driven grinding spindles should be balanced to laboratory grade precision. Other rotating components like pulleys, tool adapters should be independently balanced so that excellent working continues even after installation of replacement parts. They should be checked for vibration with the latest measuring equipment. Capacity: Care should be taken to see that the proper bearings and shaft sizes are chosen for the speed and load conditions for your grinding spindle application. Ensure that the threads are ground. This guarantees the maximum rigidity and maintainability for your spindle installations. Spindle Lubrication: Grease Packed, Oil Air etc. High speed belt driven spindles require special bearing lubrication methods. Machine features: Compact, productive design, easy belt change etc.