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Poka Yoke your Torque Assembly Process - Electric Screwdrivers

"Stupid thing, doesn't work to its full potential!" How many times have you said or heard someone say this?

 

Kolver screw drivers


This problem most likely occurred during the final assembly process of tightening the screws. Manufacturers spend countless thousands, even millions of dollars developing a product.  Dollars spent on design, material, moulding machines, robotic assembly systems, jigs and fixtures, work stations…. Only to see all their hard work undone due to missing or incorrectly tightened screws!

Kolver DC electric screwdrivers and nutrunners will make sure every screw is installed and it is correctly tightened.

Learn here how to get the best out of your Kolver units:

1. Screws missing
Tell the Kolver controller how many screws in your assembly and it will count each screw, giving an OK/NOK signal after each screw is tightened. When all screws are correctly fastened it will give a separate cycle complete signal.


2. Under/over torqued screws
You can program the target torque you wish to achieve and set control limits. If the screw is tightened within the control limits an OK signal is given. Any screw tightened outside the control limits will get a NOK signal.


3. Crossed threads
Crossed threads are detected with the inbuilt angle encoder.
The degrees of angle for a correctly tightened screw are compared against a crossed threaded screw. Angle control limits are programmed. If the screw is tightened within the control limits, an OK signal is given. Any screw tightened outside of the control limits is will get a NOK signal.


4. Stripped threads
Stripped threads are detected and given a NOK signal when the screwdriver does not reach the target torque within the screw tightening time limit.


5. Incomplete rundowns
Incomplete rundowns are detected and given a NOK signal when the screwdriver is disengaged without reaching the target torque.


6. Rehits
If the operator chooses to tighten the same screw twice a NOK signal will be given when the angle encoder determines the screw is not within the pre-programmed angle control limits.


7. Missing spring washers or gaskets.
Missing spring washers or gaskets Crossed are detected with the inbuilt angle encoder. The degrees of angle are compared against a screw tightened with the gasket against a screw tightened without the gasket. Angle control limits are programmed. If the screw is tightened within the control limits, an OK signal is given. Any screw tightened outside of the control limits is will get a NOK signal.

Using a Kolver screwdriver is like having a quality control inspector checking every screw tightened.