George wrote:
>
> The whole action on a spade bit is more of a scrape than a cut, therefore
> you can modify them easily, as long as you replicate the relief on the
> sides. Sort of like a reamer in concept.
>
> As the standard - if there is such a thing - candle is a 7/8 tapering to
> 3/4, you're not taking off much.
I modified a spade bit to drill pipe boles some years ago. Simply ground
the corners and spurs (included only to reduce tearing under intended use)
back to penny diameter. Rough bit of toolmaking, but it worked perfectly.
For a narrow taper bit, take care to prevent grabbing. Make sure the the
workpiece is securely fixtured. Use slow rpms, easy, slow, bumping feed
to clear chips. A spot of wax is helpful to reduce chatter if compatible
with finish.
A long shank will whip under working load. Cut back to ~1".
>
> "Andy Dingley" <[email protected]> wrote in message
> news:[email protected]..
> > On Tue, 19 Aug 2003 10:54:48 GMT, "George"
> > <[email protected]> wrote:
> >
> > >Do know that it is quite easy to taper a spade bit to do the same task.
> >
> > How does that work ? The spade bits I have use a spur on the "corner"
> > to do almsot all of their cutting. The side is a scraper as best, and
> > an unintentional one at that. If you taper a spade bit, then not only
> > do you expect the sides to start cutting seriously, but you're also
> > removing the spur.
> >
> > My tapered bits (chairmaking) are spoon bits. Some are ancient, one is
> > new. I think Lee Valley have them.
> >
> > For candles I just use a parallel hole.
> >
"Winfield Sample" <[email protected]> wrote in message news:[email protected]...
: At one time a catalog carried a bit to dtill a tapered hole for candles.
: Any one know where to buy one?
:
: Here;s the url that gets you to the page
http://woodworker.com/cgi-bin/FULLPRES.exe?PARTNUM=95-600
"Winfield Sample" <[email protected]> wrote in message news:[email protected]...
: At one time a catalog carried a bit to dtill a tapered hole for candles.
: Any one know where to buy one?
:
: http://woodworker.com/cgi-bin/search.exe
search on candle bit
The whole action on a spade bit is more of a scrape than a cut, therefore
you can modify them easily, as long as you replicate the relief on the
sides. Sort of like a reamer in concept.
As the standard - if there is such a thing - candle is a 7/8 tapering to
3/4, you're not taking off much.
"Andy Dingley" <[email protected]> wrote in message
news:[email protected]...
> On Tue, 19 Aug 2003 10:54:48 GMT, "George"
> <[email protected]> wrote:
>
> >Do know that it is quite easy to taper a spade bit to do the same task.
>
> How does that work ? The spade bits I have use a spur on the "corner"
> to do almsot all of their cutting. The side is a scraper as best, and
> an unintentional one at that. If you taper a spade bit, then not only
> do you expect the sides to start cutting seriously, but you're also
> removing the spur.
>
> My tapered bits (chairmaking) are spoon bits. Some are ancient, one is
> new. I think Lee Valley have them.
>
> For candles I just use a parallel hole.
>
In article <[email protected]>, [email protected]
says...
> At one time a catalog carried a bit to dtill a tapered hole for candles.
> Any one know where to buy one?
Other posters have addressed where to find the bit you seek. My
technique of handling candles is a bit different. Instead of a tapered
hole I epoxy a small brad, point up at the bottom of the hole.
(Quick drawing, use non-proportional font)
--+ +--
| |
| |
| |
| |
| ^ |
| | | |
+-----------+
The brad sticks up about 3/8" and sticks into the base of the candle.
This has satisfactorily addressed the chronically-undersized candle
problem that we seem to have locally. :-)
--
http://www.frii.com/~charlesj/woodworking
==============================================================
Not an HP spokesman | Business email: [email protected]
Hewlett-Packard Company | Personal email: [email protected]
Loveland, Colorado, USA | ICQ: 29610755 AIM: LovelandCharles
Do know that it is quite easy to taper a spade bit to do the same task.
Shorten/narrow the center point as you do it.
"Winfield Sample" <[email protected]> wrote in message
news:[email protected]...
> At one time a catalog carried a bit to dtill a tapered hole for candles.
> Any one know where to buy one?
>
>
On Tue, 19 Aug 2003 10:54:48 GMT, "George"
<[email protected]> wrote:
>Do know that it is quite easy to taper a spade bit to do the same task.
How does that work ? The spade bits I have use a spur on the "corner"
to do almsot all of their cutting. The side is a scraper as best, and
an unintentional one at that. If you taper a spade bit, then not only
do you expect the sides to start cutting seriously, but you're also
removing the spur.
My tapered bits (chairmaking) are spoon bits. Some are ancient, one is
new. I think Lee Valley have them.
For candles I just use a parallel hole.