FAQs

Question: What are the implications of fitting a larger chuck or faceplate to my Proturn lathe?

Answer:

XYZ offer a number of chuck and faceplate options which are larger than the standard chuck fitment.   If you are considering fitting a larger chuck/faceplate, there are a number of important issue to consider.

  1. Installation: The Chuck or faceplate must physically fit onto the machine (probably with the gap removed).  XYZ only sell chucks and faceplates which we know physically fit the machine.
  1. Chuck Guard:  The standard chuck guard will probably have to be removed to fit the larger device.  The lathe must not be used without a chuck guard fitted; so XYZ will sell you a replacement guard suitable for use with the larger chuck/faceplate which must be fitted in place of the original chuck guard.
  1. Max RPM:  Chucks/faceplates larger than the standard fitment may have a maximum permissible speed which is less than the maximum RPM capability of the machine.  Please ensure you enter the chuck/faceplate rated speed into the ProtoTrak control before running the spindle (MAX RPM must be entered on control boot up at CHECK SYSTEM and can also be entered at any time from the DRO menu).  Also, you must further restrict the maximum RPM to take into account any workpiece imbalance.  The maximum permissible speed is stated in the chuck manufacturer’s literature and, for self-centring chucks, is also marked on the outside of the chuck.
  1. Spindle Drive:  A larger chuck or faceplate will almost certainly mean a bigger load (inertia) for the spindle to drive.  The standard spindle drive configuration is set up to handle work pieces and chucks as detailed below:
     
    Lathe  Max chuck considered “Standard”  Max workpiece Size
    Dia Length
    SLX 1630 250mm 250mm 500mm
    SLX 355 250mm 250mm 500mm
    SLX 425 400mm 300mm 800mm
    SLX 555 500mm 300mm 1000mm

Maximum work piece size that you regularly machine, should fall below the following curves.  This data is for solid, steel bar at realistic surface speeds.  If you are machining tubes and/or less dense materials, such as aluminium, then the Length/radius constraints can be relaxed.  Please contact XYZ for advice if you have any concerns.

These figures apply to turning in Z only, so that the maximum RPM of large (diameter) workpieces is restricted by realistic surface cutting speeds. When cutting in X (e.g. facing off or faceplate work), the effects of driving the spindle in a Constant Surface Speed mode, may mean there is a need to adapt the spindle drive parameters.

If you are working with very large workpieces and using CSS, please contact XYZ for advice.

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