DIYbanter - View Single Post

Cydrome Leader

Larry Jaques wrote:
On Sun, 22 Jun 2014 14:26:42 -0400, Tom Gardner Mars@Tacks wrote:

On 6/22/2014 2:18 PM, Lloyd E. Sponenburgh wrote:
Tom Gardner Mars@Tacks fired this volley in news:r-
:

The holes don't have to be burr-free but I would like to
minimize the burrs without any secondary operations.

Tom, you can't eliminate the "breakout" burrs. Use the fastest feed you
can to get a clean chip, and you will almost completely eliminate the
burrs at the top of the hole.

Son, de-burring is part of the process. Unless you put a 'waste sheet'
under the material, and drill into it past the shoulder of the bit,
you're going to get burrs. And then only if it's clamped so tight to the
work that there's not a chance of pushing a burr between the sheets.

LLoyd

A sacrificial piece of hardwood be sufficient? How about a drill
bushing under the tube?

Either will only minimize burrs. They're an annoying fact of life.

how about punching holes in the tube and skip the drill?