"Gunner" wrote in message
news
On Sat, 8 Oct 2005 12:41:04 -0700, "Harold and Susan Vordos"
wrote:


"DeepDiver" wrote in message
...
"Harold and Susan Vordos" wrote in message
...

That drives the cutting tool of choice, and it's extracted from
the taper socket via the rectangular access hole through the
side of the adapter. Sort of a quick change.

Is it possible the square cross-hole is to engage the driving tang on
the
ends of tang-shaft drill bits? That's what it looks like to my novice
eyes.

- Michael


You're obviously correct, and I should have so noted. I have a few of
the
drills that are used in such adapters, though I've never used them.

Harold


I was given a full set of both drill and tap MT2 collets by an old
machinist. He explained to me..that the square hole was to stick in a
bit of key stock in case the drill slipped too deeply in the
collet..IE to prevent the drill from moving, and to assist in removing
a drill bit, perhaps one that was a smidge oversized or galled,

I use them regularly on my Hardinge lathes, and have only had one
slip, due to incompetence on my part.

Gunner

It's clear the slot has multiple uses----it need not be used as a drive--no
more so than a standard taper when a tang is not a part of a shank. Great
design---capable of multiple usage. How many of us have seen a tang
twisted off a large twist drill? They work, but only to a point. On
small stuff, it insures a breakage when things go pear shaped.

It might be noteworthy than shanks on taps are generally a ******* size,
even when getting to larger diameters. It's always been a source of
irritation for me. :-(

Harold