On 9/20/22 09:55, Todd Zuercher wrote:
They are not intended for drilling, only enlarging existing openings.
Mill a rough hole 1st, using a helical path and a sharp up spiral bit, then
finish it off with the boring bar. (Although in wood I'd probably not bother
with the boring bar at all and do it all with a sharp carbide two flute endmill
designed for cutting wood aka a router bit.)
The hole is a hair north of 2" deep, Todd, beyond the reach of the
SC bits I can afford. I have considered cutting most of the shank
of a spade bit away. Kept sharp that would work. Do it in two passes,
once to clear the hole, then spiral to size with a second pass. Probably
get a cleaner hole than I'm getting now.
Thanks. Take care & stay well.
Todd Zuercher
P. Graham Dunn Inc.
630 Henry Street
Dalton, Ohio 44618
Phone: (330)828-2105ext. 2031
-----Original Message-----
From: gene heskett <ghesk...@shentel.net>
Sent: Tuesday, September 20, 2022 5:35 AM
To: emc-users@lists.sourceforge.net
Subject: Re: [Emc-users] boring bar in boring head advice?
[EXTERNAL EMAIL] Be sure links are safe.
On 9/20/22 05:06, andy pugh wrote:
On Tue, 20 Sept 2022 at 09:48, gene heskett <ghesk...@shentel.net> wrote:
But the head offsets in a kit of boring bars are such the a 1/2" wide
bar, while boring about the
size hole I need, is also leaving about 3/16" in the center as an
uncut post sticking up. So I assume that proper orientation of the
boring bar in the head might assure its cleaning out the center.
I would typically imagine a boring head to be used to machine a
pre-drilled hole to size. Are you actually trying to plunge-cut with a boring
head?
Yes, the material is hard maple. In metal, yes, I'd bore a starter hole.
I probably need to
make a jig to hold the workpiece high enough to let this plug drop free, but I
don't have, in the go704, enough head room for that, the boring heads length
for a
3 incher, take up too much
room to allow that. Needless to say, the carbide bar has been re-sharpened
until you could shave your arm just trying to get a clean exit hole. 2000 grit
CBN is handy for that.
Cheers, Gene Heskett.
--
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soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.
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Cheers, Gene Heskett.
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.
- Louis D. Brandeis
Genes Web page <http://geneslinuxbox.net:6309/>
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