On Sat, 25 Feb 2006 03:34:36 GMT, "carl mciver"
wrote:
At work I use Cleco, Ingersol Rand, Atlas Copco, and a few other brands
of screwguns and nutrunners. Ours are all fixed calibration due to the
precise nature of the game, but you can also get them in adjustable. Not
cheap, but they run down fast and stop clean. You won't see this on the
basic information in all the catalogs, but some folks are particular about
whether they run any time the trigger is pulled or run only when the trigger
is pulled and the driver pushed down, telling it there's work to do. The
Cleco brand I like won't run until you press down with the fastener and
trigger pulled, and once torqued off will require tool lifting and
repressing to hit it again, which may or may not be a good thing for you.
Do a search for pneumatic screw drivers or similar on ebay. The stuff
marketed to aviation will have a lot more stable torque range, which for a
4-40 I assume you want. Of course with functionality comes price...

I second the recommendation of a Cleco. I probably bought over 40 of
them for a 2 shift operation, and they were the most accurate and
trouble free brand that we had. Push to start and the clutch kicked
out at a pre-set torque that was not sensitive to air pressure. Not
cheap, but a quality, trouble free tool.

John Normile