Workpiece Clamping¶
Setting¶
WARNING
Refer to the instruction manuals prepared by the chuck and cylinder manufacturers for the allowable plunger thrust of the chuck, allowable chucking and cylinder pressures, and the relationship between the top jaw height and allowable cylinder thrust, which must be set to a value within the permissible value range. If difficult to determine, contact the DynamiTech Service Department. [Chuck, cylinder damage/Workpiece and jaw ejection]
Set the chucking pressure and tailstock spindle thrusting force (tailstock specifications only) with full consideration given to the shape and material of the workpiece to be machined and machining conditions. [Workpiece ejection]
The user is responsible for setting the speed of the chuck by taking the workpiece dimensions and shapes, cutting force, and chuck maintenance and inspections into consideration. Rotate the spindle at a speed no faster than allowable values under specified conditions. [Workpiece ejection]
Soft Jaws¶
WARNING
Do not machine the counter bore depth of the soft jaw mounting bolt. [Loosened soft jaw causing workpiece ejection]
Lifting Workpiece¶
WARNING
Only technicians qualified to operate cranes are to perform workpiece-lifting procedures. [Workpiece, Machine damage/Accident]
When two or more people are involved in lifting, cooperation and clear communication is necessary at all times. [Accident]
Use only wires, shackles and jigs strong enough to support the total weight of the workpiece. [Dropped workpiece]
Before lifting a workpiece, check that is held securely. [Workpiece ejection]
Raise the workpiece a short distance off the floor to confirm it is well balanced in both crosswise and lengthwise directions. [Dropped workpiece]
Safety Precautions¶
WARNING
When machining long workpieces, always clamp the free end of the workpiece securely with the tailstock or a steady rest (if installed). [Workpiece bent or shaken during spindle rotation, ejection outside of the machine]
Before clamping a workpiece in the chuck, check using a pressure gage that the correct hydraulic or air pressure is supplied to the cylinder that actuates chuck operation. [Workpiece ejection]
If a gap exists between the workpiece rear surface and the chuck locator face or the jaw face on which the workpiece is to be seated, the workpiece rotation centerline is tilted in relation to the chuck rotation centerline, or if the workpiece is cast or forged, carry out test cutting at a low spindle speed to ensure safety. [Cutting force exceeds workpiece clamping capacity of chuck, causing workpiece ejection]
When a workpiece is eccentric, not round or the center of gravity of the workpiece is not at the center of the rotation, balance using a balancer with full consideration given to machining conditions such as the spindle speed. [Workpiece ejection]
Do not rotate the spindle without a workpiece when using a balancer. [Spindle bearing wear, component seizure]
When using a manually tightened chuck or fixture, always remove the clamp handle or tightening tool from the chuck or fixture after tightening. [Clamp handle, tightening tool ejection]
CAUTION
When chucking or supporting a workpiece, take the rigidity of the workpiece into account when determining the chucking or supporting method and chucking pressure or tailstock thrust (if installed). [Impaired machine accuracy]
Do not subject the chuck jaws or workpiece to shock. [Adversely affecting chucking accuracy, functions, and service life]
When leaving the machine with the power OFF for an extended period, always remove the workpiece from the clamping device. [Dropped workpiece/Chuck and tailstock clamping mechanism service life adversely affected]
When clamping or unclamping the chuck, take care to ensure hands or fingers do not become caught in the chuck or chuck jaws. [Injury]