Collet Torque Test Procedure

Collet Torque Test

Collet torque test procedure should be carried out either on the regular schedule as specified in the maintenance procedure or when the collet fails to grip the tool fully during drill entry or retract.

  • Minimum collet torque for drilling = 0.75 Nm (300g at 10″)
  • Minimum collet torque for routing = 1.06 Nm (425g at 10″)
  • Minimum collet torque for drilling holes > 3mm = 1.06 Nm (425g at 10″)

Very important: never close the collet without a tool or blank fitted.

Torque Test Tool Drawing
Calibrated Torque Meter drawing
Spanner tool drawing

Torque tool kit Westwind part numbers:

  • 1/8″ collets = part number: 52547
  • 2mm collets = part number: 52998
Open Collet with Standard Pressure Drawing

Actuate (open) collet using standard pressure.

PSI Bar Drawing

Note: refer to outline drawing for correct collet actuation pressure.

REmoving Tool Drawing

Remove tool.

Degrease Tool Drawing

Fit torque test tool.

Close Collet Drawing

Close collet with tool in place.

Torque Meter fitting on the tool

Spanner fit to square on tool.

Torque meter fit to hexagon on tool.

REset Indicator Pressure Meter

Reset indicator needle to zero.

Hold Collet with Spanner Drawing

Hold collet still with spanner.

Torque Test Meter Tool Rad Drawing

Push or pull the torque test meter until the tool slips, then read off dial.

This example shows a torque value of 0.80 Nm (320g).

  • Minimum torque for drilling = 0.75 Nm (300g at 10″)
  • Minimum torque for routing = 1.06 Nm (425g at 10″)
  • Minimum torque for drilling holes > 3mm = 1.06 Nm (425g at 10″)

Note: if torque values are below the minimum figures then carry out collet maintenance and repeat this procedure.

How to change collet and test pressure