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If you happen to have a faulty industrial electric screwdriver on hand, you might suddenly get the idea of converting it into a portable electric screwdriver powered by lithium batteries.

1.Current Condition: The self-locking steel ball in the screwdriver head is missing, so you cannot securely lock the bit in place after inserting it.

2.Disassemble the housing and inspect the interior. You will find that several internal wires have broken. After testing, you confirm that the motor is still in good condition. You decide to use a direct-wiring approach by connecting the wires directly to the motor.

3.You keep the original switch mechanism in place and continue using it. During a simple test, you measure a speed of 270 RPM at 12V and 460 RPM at 16V. You finally select 16V as the operating voltage. The operating current is approximately 500 mA. You initially plan to power the screwdriver with a 14500 lithium-ion battery pack.

4.Prepare an extended adapter rod.

5.Cut off the excess section.

6.Grind and smooth the surface to achieve a tight press fit with minimal clearance. Use a hammer to tap the adapter rod into place.

7.Complete the hammer-assisted assembly. Although the concentricity is not particularly good, it is sufficient for driving screws.

8.Prepare a battery holder.

9.Connect four battery cells in series. The resulting rotational speed feels as expected.

10.Connect the wiring to the electric screwdriver body.

11.Insert the battery cells and secure them with reusable cable ties.

12.Complete the main assembly. The 4 mm screwdriver bit has not yet been installed.

13.Install the 4 mm screwdriver bit and press the switch to test it. The screwdriver operates normally. With that, you now have a handy electric screwdriver ready for use.