Thank you, krobert-ga, for answering brian0575-ga's "Newton's Law"
question and thus satisfying my curiosity about the working principle
of impact wrenches.
Found --in the wake of your explanation-- that they are called
snap-ons in UK.

This question could be answered anyhow, by researcher krobert-ga.

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Clarification of Question by googel-ga on 30 Jun 2003 15:58 PDT

Thanks to brian0575-ga for the question:

Subject: Newton's Law 
Category: Science 
Asked by: brian0575-ga 
List Price: $10.00  Posted: 26 Jun 2003 01:03 PDT 
Expires: 26 Jul 2003 01:03 PDT 
Question ID: 221870 
 
When I was a young man I was taught that every action has a reaction.  
If I use an electric drill to bore a hole -  and the drill bit becomes 
'stuck' the electric drill tries to twist my arm.   If I use an 'air 
powered' mechanics' gun I am able to undo ever the tightest nuts/bolts 
e.g. lorry wheel nuts,  with hardly any effort  -  apart from a 
'machine gun' noise.   My query   -  WHERE HAS THE REACTION GONE THAT 
NEWTON SAID THERE WOULD BE? 
 
                Regards, 
 
                    Brian Allanson.

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Clarification of Question by googel-ga on 01 Jul 2003 02:15 PDT

It seems that the connection between snap-on tools and impact
wrenchers is made much stronger by my enthusiasm than it is in
reality.

googel-ga,

Actually, Span-On is a brand of tool. Located on the WWW here:

http://www.snap-on.com/

These are quite popular on the various racing circuits in the US.

As with any other recognized brand name, the tool takes on the brand
name rather than the name of the tool. "Hand me that Snap-On."

And here is an air wrench:

http://buy1.snapon.com/catalog/pro_det.asp?P65=yes&qt=1&tool=all&catItem=true&INV_ONHAND=&FREIGHT=&qty=1&Item_id=15806&PartNo=AT775&Price=662.95&ListPrice=662.95&FORMNAME=1&Desc=Impact+Wrench%2C+Air%2C+Heavy+Duty%2C+3%2F4%22+Drive+%28300-800+ft.+lb.%29&SUB_Cat_ID=1623435&SUB_Cat_NAME=Impact+Wrenches&Cat_ID=1623003&Cat_NAME=Power+Tools%2C+Air&group_id=802&group_NAME=3%2F4%22+Drive&store=snapon-stor
&dir=catalog

I hope that whole link came through, else you may type in "air tools"
in the search box on snap-on's website.

Thanks for the question googel-ga!

krobert-ga

Thank you again krobert-ga! 

Yours sincerely,
googel-ga