The old chuck wrench method worked well but all the new drill chucks are hand tightened and do not hold well. Bits and drills fall out or won't turn when you try to drill a hole.

The old chuck wrench method worked well but all the new drill chucks are hand tightened and do not hold well. Bits and drills fall out or won't turn when you try to drill a hole.

Can someone recommend a good cordless power drill (volts and battery life) under 0.00?

The old chuck wrench method worked well but all the new drill chucks are hand tightened and do not hold well. Bits and drills fall out or won't turn when you try to drill a hole.

I just purchased a 36V DeWalt cordless drill and there is a spark after I release the trigger. Is that normal? I'm assuming it is due the power of the drill, but would like some comments please.
Thank you.

What are the effects of using an inverter with a modified sine wave output to power devices that were designed to be powered with a pure sine wave?

What kind of devices are adversely affected by modified sine wave power, and what exactly are the effects.

It seems that the modified sine wave power could still properly be Pulse Width Modulated using SCRs, as long as the duty cycle is changed to produce the same effective power.

What effect does the modified sine wave have on single phase AC motors? It makes sense that more heat would be generated in the motor due to third harmonics, but I assume "brushless DC motors" don't use a pure sine wave either.

What about switching power supplies?

Cordless drill battery chargers?

Pure sine wave inverters are more expensive and less efficient than the modified sine wave inverters. Where does a true sine wave really become an advantage.

I have recently purchased a used !" SDS Rotary Hammer Drill and only need to drill a relatively small hole through a concrete slab. Is this too much tool for the job or will it work. I don't own a regular hammer drill and someone told me I would burn the motor up if I used a regular hammer drill to drill about 20 holes through concrete.

i am doing a IB project for school and im doing wind energy. I'm making a model i only have until july 22 to complete the model