y form. DC motors-Cost-As with AC, prices vary incredibly, from, $30 up to $400 for the latest in technology. Again, the difference in price reflects quality. Safety-Very safe, handy man drill as you can use it in the rain with no hassle. Also, there are no worries with cords.Maintenance-General maintenance requiredManeuverability- excellent movement available, take anywhere. Speed/Torque control- available on all cordless drills.Summary-cordless drills are excellent, you can use them any where any time. They are very reasonably priced. Low maintenance.PneumaticPneumatic/Air generation- An electric or petrol powered motor forces air into a cylinder where a piston compresses it and stores it in a tank.Pneumatic motors- compressed air is forced into the drill where there are several blades, the rotor spins as compressed air is forced against each blade making it spin. With the rotor spinning, as does the tool. Cost- Pneumatic drills would be the cheapest of the three ( mid-range price ). Although, with the others, you dont need any other equipment. With air tool you need to have, a compressor, regulator, filter and hoses. All of these make a pneumatic drill, quite a bit more expensive. Although you can run other air tools off it. Safety- Concern here are with having get compressed air into the bloodstream will result in near instant death. Compressor tanks are also very dangerous, if it were to be punctured or subject to excessive heat when full it would explode with enough force to kill any one around within about 20 meters. Maintenance- low effort, as the air cleans the motor. Keep chuck oiled.Maneuverability-Movement is limited by length of the hose.Speed/Torque control- Forward and reverse option only.Summary- Not as good as the other two as for our application, low RPM is required and pneumatic drills lack in that field. Safety also is a serious issue.Recommendations- For our application I recommend to use a cordless drill becaus...
