Optimizing the Tool Performance
Recommended number of pulses
A Pulse tool well suited for your application should reach the target torque (with shut off) within 5-20 pulses. The number of pulses it takes for the tool to reach target torque can be measured with an analyzer. The tightening time can also be used as a guide, to know if the tool is appropriate for your application:
≤ 1 second for tools up to 30 Nm
≈ 1 second for tools up to 80 Nm
≈ 2 seconds for tools up to 150 Nm
≈ 5 seconds for tools up to 450 Nm
≤ 10 seconds for tools up to 850 Nm
If the target torque is achieved with less than 5 pulses (= short tightening time), the torque scatter will increase and it can be difficult to adjust to the right level, especially on hard joints.
If the target torque is achieved with more than 20 pulses (= too long tightening time) the wear will increase and more frequent oil filling and service will be required. Too long tightening time, in combination with high production rate, may also result in excessive heating of the oil. In that case the power will decrease with longer tightening time and sometimes no shut off.
If the target torque is achieved with less than 5 pulses this can be fixed by:
Decreasing the air pressure.
Reducing the speed by means of the AutoTrim or Trim valve.
If the above is not possible or does not give wanted results, a smaller tool may be a better choice.
If the target torque is achieved with more than 20 pulses this can be fixed by:
Increasing the dynamic air pressure to 6-7 bar for standard EP tools, or up to 5 bar for low pressure EP L-tools.
Adjust the AutoTrim or Trim valve to give maximum power/speed.
If the above is not possible or does not give wanted results, a bigger tool may be a better choice.
When changing the air pressure, the target torque must be measured again and adjusted if needed.
