GCSE tech help - information on eletric Drills?

Question

I have my GCSE exam for Resistant Materials soon, i know it is going to be on the subject of drills.

please can you tell me all the parts of a drill ( e.g. chuck ect) and good and bad points about them please.

Anything at all about drills will be useful so please say anything to do with them, for instance how long the battery lasts, what colours they are and why, i know some basic information already but anything you say will help.

Thank you

Answer 1

I can't tell you everything.....Only a few things.....

Drills spin, so there is the physics of motion.......so therefore, you are talking about "torque". Torque is the twisting motion that causes rotation.

For example, a hand drill produces, I guess, 30 pound feet of torque.

An industraial hand drill produces, I guess, 140-200 pound feet of torque.

And of course, drills are not complete without drill "bits". Drill bits are the parts of the drill that you attach to the drill itself and uses various sizes in the English system, or, in Europe, the metric system. For example,

A 4" bit

A 3 1/2" bit

A 5/16" bit

And of course, electric drills are attached to wires, so let's talk about electricity and drills, a little bit....

A usual electric drill has an electric motor that runs the drill bit to make it spin. Usual voltage for a hand drill is 120V, but can be as much as 130V. Generally, this is VAC (volts (of) alternating current)...not DC.

The part of the drill you will often use is a handle or a grip that keeps the drill bit in place when energized and spun. You need to try to keep the drill as still as possible to cut back on or eliminate excess wobbling.

The main electrical danger, of course, occurs when you expose a hand drill that is energized when you immerse it in water. Doing that will create a "ground fault" or a "circuit leak", which can cause electric shock or electrocution leading to injury or death. That is why drills used near water need outlets that are GFCIs. GFCI is a Ground Fault Circuit Interrupter. That way, if you accidentially throw the hand drill into the water, the GFCI outlet should detect the water-laden ground fault and stop the electric current like a circuit breaker does. You still need to unplug the drill before you take it out of the water but at least, electrocution is not going to be likely.

Answer 2

http://www.google.co.uk/search?hl=en&q=d...