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Lubrication for Lathe Chuck
One of the most important accessories on this CNC lathe is the lathe chuck and its jaw set, including hard master jaws and top soft jaws, which holds every wheel that is going to be machined. A lathe chuck can only achieve its maximum clamping force when its internal components are very clean and well lubricated by its design.
  A chuck with special soft jaw set for wheel work. 
  A wheel is installed on the chuck of CNC lathe.
  Three Master Jaws which moves in & out. 
  Pinion gears and scroll        plate are shown for a 3-jaw chuck.
   The scroll plate  works with pinion gears to move master jaws in & out 
 The back view of scroll plate which moves the master jaws
​​   D1-8 Type Camlock system to attach spindle. 
Working diagram of 3-jaw
Self -centered lathe chuck
  ​​The cleaning example for the master jaws.  
   
Please refer to above pictures for the working principle and diagram with a 3-jaw lathe chuck. It would be very helpful to understand how the master jaws are moved in and out. Therefore, it would not be difficult to understand why this chuck must be cleaned and lubricated all the time in order to work normally. When small chips or dirt are accumulated along the slots where the master jaws are moving in and out, the inadequate clamping force can lead to the workpiece being thrown from the chuck and striking the operator and other bystanders.
 
 
Therefor the basic maintenance on the lathe chuck shall be followed every day so long as this CNC lathe is in operation. Otherwise, a lathe chuck with reduced clamping force has a much higher risk of losing its grip during the operation and throwing the workpiece with deadly force, which not only cause the damages to the machine, but also may result in personal injuries or even death.

  
A. Daily Maintenance:

  • Always disconnect electric power to the CNC lathe before any work.
  • Check / correct loose mounting bolts with the chuck and soft jaws.
  • Use a small vacuum, rag or brush to clean the chuck and soft jaws.
  • Wipe down the outside of the chuck with light machine oil.
 
B. Regular Lubrication (Always disconnect lathe from power first) :
 
  • At least once a week, remove and clean the jaws. Clean the chips off the scroll gear if necessary. Then, reinstall the jaws and apply lubricant (Chuck Grease) to the scroll gear and jaw sliding surface.
  • After having cleaned master jaws and entire chuck, use chuck wrench to move the master jaws in and out multiple times in order to distribute the lubricant. This movement for master jaws to go in and out should be very smooth and very easy if this chuck is well maintained. Should you feel any unevenness or major resistance during this test, you need to consider a full service to the entire chuck by professional machine repair guy.
  • Every Six Months, the entire lathe chuck should be required for full disassembly, cleaning and lubrication. In case that the lathe chuck is exposed to dirty work environments, heavy workloads, and cutting fluid, this service shall be done every 3 months.
  
    
C. Handling Chuck Carefully & Safely
 
  • Always disconnect lathe from the power before doing any chuck work. 
  • Please note that this 16” 3-jaw chuck is very heavy, more than 200 LBS. A dropped chuck can result in amputation or crushing injuries and equipment damages in the same time. A previous working experience from a professional machine shop is required to handle this chuck.
  • It is important to have a machine repair specialist from local area to perform this kind of major and full service to remove the chuck form the lathe and dissemble the chuck in order to avoid potential damages to the chuck and to the lathe as well as possible injuries to anyone who works around the lathe. Always use some kind of chuck cradle, protective device, or special lifting equipment when to install and remove from the CNC lathe.