Originally Posted by
ShaneB
Impacts and drills are 2 different animals. Most impacts don`t have a standard chuck that you can use things like drill bits with. They usually have a 1/4" hex socket. While they do deliver high torque, it is FAR from smooth in terms of the power transfer. They are called impact for a reason, there is a small hammer that spins around and hits a little stop inside that gives the tool its power. That`s also where that tapping sound comes from when using one. This would be nowhere near ideal for polishing as when the tool is under load, rotation stops until the hammer comes around again and it moves, then stops again until the next time around. So I wouldn`t even consider it an option to polish anything.
your cordless drills almost all have a variable speed trigger, as well as 2 torque or speed settings (low rpm/hi torque or hi rpm/low torque) one good for driving screws, other for drilling. Either way you have good control over the speed.
i have used both dewalt and makita tools and IMO the makita tools are superior. Not saying the dewalt tools are bad, but makita just seems to have a better feel and build quality. You can`t really go wrong either way. When shopping you can usually find a combo kit with a drill, impact driver, 2 batteries and a charger for $150-$200. Keep in mind the standard batteries are typically 1-1.5 Ah. Which aren`t bad and last plenty long. But you may want to consider the 3+ Ah batteries that more than double the use from a single charge. These batteries are very expensive though costing upwards of $120 for a 2 pack (always look for them in a pack of 2 for the best price).
as stated before, look for a minimum 18v battery, and be sure to get lithium as well. Lithium batteries have a constant power until they die, then they just cut out all together. While a regular battery will slowly lose power until it will barely run anything.
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