On 2016-03-30, Leon lcb11211@swbelldotnet wrote:

Actually so has the automotive industry. Hole saws were used with a
hand held drill to add AC systems to vehicles as a retrofit many years
ago. Refrigerant lines had to be run from under the hood through the
firewall into the evaporator unit.

Note I never sed, "it can not be done". Also note the U2B video speaks
of the problems of drilling metal with the tools shown and even shows
the tools binding, stalling, etc.

I might (but, prolly not) try this with my DW portable battery drill
motor, with sed clutch mechanism, but definitely not with my Milwaukee
1/2" drill motor w/o clutch mechanism (400rpm). The first time that
Milwaukee caught, it'd probably almost break my wrist (BTDT!).

You wanna try it? Be my guest. I'll use a stepped-bit or a drill
press, thank you.

As fer "the automotive industry", I've frequented those sound-system
chop shops. Their "hole saws" were defeated by my '66 Dodge van
dashboard. Perhaps they were using "old school" hole saws.

Yes, I AM "old school". Not all my drill motors are battery pwrd and
have clutches. NOT all my pwr tools are StopSaws or Festools. Funny
that a hobby like woodworking, which so highly prizes "old school"
hand craftmanship, takes me to task fer not having the newest
technology. That's OK. I unnerstan.

BTW, my 1/4" paring chisel finally arrived. Yay!

nb