Let the Record show that Gunner Asch on
or about Sun, 05 Jul 2009 14:00:34 -0700 did write/type or cause to
appear in rec.crafts.metalworking the following:
On Sun, 05 Jul 2009 20:42:03 +0700, Bruce In Bangkok
wrote:

On Sun, 05 Jul 2009 08:19:06 GMT, "Harold and Susan Vordos"
wrote:


"Calif Bill" wrote in message
newsPydnduUWOzGZdbXnZ2dnUVZ_gWdnZ2d@earthlink .com...
snip---


Impossible to drill an undersize hole. As the drill will not go through
the hole. Sharpen the end offset as to the center point and you will get
a bigger hole.

No, it isn't. It's not all that uncommon.

Harold

Errr Harold, will you explain that a tiny bit.

I measure the shank of a, say .500", drill. Stick in the machine and
drill a .450" diameter hole? In mild steel? 1 inch thick?

Cheers,

Bruce
(bruceinbangkokatgmaildotcom)

Harold is quite right. Ive been sorting out boxes of drill bits..and
the shank diameter is NOT always the same as the bit diameter.

Ive measured Good .500 bits and they tend to actually mic out at
.495-.502

Quite a range..and a head scratcher when the hole is too small.

I learned about the difference between "normal' drill bits and TiN
coated ones. Didn't make much of a difference, just that the TiN
drills made a hole some .005 over tolerance. Fark!


pyotr
-
pyotr filipivich
We will drink no whiskey before its nine.
It's eight fifty eight. Close enough!