Setting Up A Bar Puller

Do you want to learn more about how to set up a bar puller on a CNC machine? There are three types of turning work: chucking work, shaft work, and bar work. Turning centers differ when it comes to which kind of turning work they do best. There are turning centers that have been precisely designed for one of these three types.

Here are the over-all steps essential for bar pulling.

  • For preliminary setup: Set the bar puller in a turret station.
  • Set the bar in the spindle.
  • Manually load the bar end to spread from the chuck jaws.
  • Decide the program zero assignment values (geometry counterbalances for Fanuc) for the bar puller.
  • For the following bar, only phases 2 and 3 need to be done.


How a Bar Puller Works?

This device is attached in the turret of the turning center and uses axis motion to occupy and advance the bar. The bar being used as raw material is positioned in the spindle. This means, certainly, that the turning center should have a hole from the beginning to end of the spindle.

Note that some turning centers have a draw bar (contrasted with a draw tube) to open and close the chuck. Machines with draw bars cannot be used for bar work (devoid of replacing the work holding device with one that uses a draw tube). The whole bar must be bounded by the spindle. On no account should the bar be allowed to extend past the rear end of the spindle. This means that the bar should be cut to a length that will be suitable in the spindle, usually about three feet long.

Universal CNC turning centers usually come with a three-jaw chuck for work holding. This will let chucking work be done. They’ll also take a tailstock to support long work pieces – which obviously allows shaft work to be done. But most universal turning centers don’t come with whatever that allows them to complete bar work. These machines deliver no way to advance the bar during the machining cycle.