I need to tap a couple hundred 10-24 holes through 1/4" 6061 aluminum, and the project is way too big to put onto a mill or drill table. To speed this project up I am considering getting either the Bosch electric tapping gun or a Sioux pneumatic tapper (model TPA9C-420).
So my questions are:1) Neither tapping gun appears to provide any sort of clutch function, and the pneumatic tapper appears to hold the tap rigidly. If I use either of these tapping guns, am I likely to break a lot of taps? I suspect either gun would be way faster than doing this by hand but if I have to add time to deal with broken taps there is probably no overall time savings.
2) what is the typical air consumption for pneumatic tappers? All that I have seen are speced at around 30 cfm while running at full speed but I dont know the typical % time the air motor is actually running. My air compressor is only a 17cfm unit so I'm wondering if it would be running constantly or even falling to keep up with an air tapper.3) any comments re: which of these tappers is better for this sort of tapping? Or is there some other tapper I should be considering? I almost always use small taps (up to 1/4") in either 6061 or mild steel.