Speed Drill
Speed Drill
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 1 1 2 SDS ELECTRIC ROTARY HAMMER DRILL VARIABLE SPEED $69.99 Time Remaining: 11d 1h 26m Buy It Now for only: $69.99 |
 1 1 2 ELECTRIC ROTARY HAMMER DRILL BITS CHISEL PUNCH VARIABLE SPEED $64.99 Time Remaining: 1d 12h 28m |
 1 Rotary Hammer Drill 110 Volt Variable Speed 2 Positions Additional Bits $55.00 Time Remaining: 8d 18h 26m Buy It Now for only: $55.00 |
 Irwin 1 4 x 6 SDS+ Speed Power Hammer Carbide Drill Bit 1773385 $2.50 Time Remaining: 21d 12h 4m Buy It Now for only: $2.50 |
 Variable speed 1 1 2 SDS Electric ROTARY HAMMER DRILL $73.99 Time Remaining: 17d 17h 27m Buy It Now for only: $73.99 |
 1 Neiko SDS Rotary Hammer Drill Variable speed control $74.99 Time Remaining: 3d 18h 25m Buy It Now for only: $74.99 |
 Milwaukee 1 2 Dual Torque Variable Speed Hammer Drill $169.95 Time Remaining: 19d 16h 8m Buy It Now for only: $169.95 |
 Fein 1 in Variable Speed Rotary Hand Drill DSKE672 NEW $1,789.99 Time Remaining: 9d 20h 53m Buy It Now for only: $1,789.99 |
 1 1 2 SDS Electric Rotary Hammer Drill Variable Speed Heavy Duty Power Tools HD $67.49 Time Remaining: 2d 20h 13m |
 ED0001 DHTQU Variable Speed Rotary DRILL Kit THD 1000 $49.95 Time Remaining: 12d 17h 3m Buy It Now for only: $49.95 |
 Fein 1 2 in Variable Speed Hammer Drill DSCEU638 NEW $309.99 Time Remaining: 11d 47m Buy It Now for only: $309.99 |
 Fein 1 2 in Variable Speed Rotary Hand Drill DSEU638 NEW $369.99 Time Remaining: 9d 20h 53m Buy It Now for only: $369.99 |
 Fein 5 8 in Variable Speed Rotary Hand Drill DS648 NEW $789.99 Time Remaining: 9d 20h 53m Buy It Now for only: $789.99 |
 Fein 7 8 in Variable Speed Rotary Hand Drill DSE648 NEW $889.99 Time Remaining: 9d 20h 53m Buy It Now for only: $889.99 |
 Fein 1 1 4 in Variable Speed Reversible Rotary Hand Drill DDSK672 1 NEW $1,949.99 Time Remaining: 9d 20h 53m Buy It Now for only: $1,949.99 |
How is the two-speed feauture of a DC coordless drill constructed?
A two-speed switch selects between resistors connected in series with the motor
A two-speed switch selects between full battery voltage or a tap in the battery pack
A two-speed switch connects the batteries to two different field windings
The ON/OFF switch has two contacts that are enabled depeing upon the amount the trigger is depressed.
If this is multiple choice then depending on the manufacturer, a couple of answers are good. The two field windings, although possible, make for a very expensive motor so that you won't find. The on/off switch with two contacts is similar to the speed resistor one. One of those would be my choice if these were all I had to choose from. The battery tap wouldn't work well because you would drain a portion of the battery and when you switched to the full battery there would be a huge surge inside the battery pack to balance out the two parts. In all practicality though, most manufacturers use a slide type resistor in the trigger to give Variable speed. That's easier than all the extra stuff needed for just two speeds.