I made a wooden burr puzzle the other day and noticed that the blade
doesn't cut a square-bottomed groove. An exaggeration of the cut looks
similar to this:
| |
| |
| |
|__/ \__|
I looked at the blade tips and sure enough they're not squared, but
angled. I thought it was maybe the crappy stock blade I got with my
TS, but a trip to HD showed me that all blade have tips like this.
So what gives? Do any blades cut a square-bottomed groove like this:
| |
| |
| |
|_______|
Mike
<[email protected]> wrote in message
news:[email protected]...
>I made a wooden burr puzzle the other day and noticed that the blade
> doesn't cut a square-bottomed groove. An exaggeration of the cut looks
> similar to this:
>
> | |
> | |
> | |
> |__/ \__|
>
> I looked at the blade tips and sure enough they're not squared, but
> angled. I thought it was maybe the crappy stock blade I got with my
> TS, but a trip to HD showed me that all blade have tips like this.
>
> So what gives? Do any blades cut a square-bottomed groove like this:
>
> | |
> | |
> | |
> |_______|
>
> Mike
>
You blade is has the ATB profile which is intended for through cutting.
What you need for a flat bottom cut is FTG which are used mostly for
ripping.
Jim
[email protected] wrote in news:1157822199.316386.260210
@i3g2000cwc.googlegroups.com:
> I made a wooden burr puzzle the other day and noticed that the blade
> doesn't cut a square-bottomed groove. An exaggeration of the cut
looks
> similar to this:
>
>| |
>| |
>| |
>|__/ \__|
>
> I looked at the blade tips and sure enough they're not squared, but
> angled. I thought it was maybe the crappy stock blade I got with my
> TS, but a trip to HD showed me that all blade have tips like this.
>
> So what gives? Do any blades cut a square-bottomed groove like this:
>
>| |
>| |
>| |
>|_______|
>
> Mike
>
Square bottomed cuts are useful for various boxmaking joints as well. I
had a square-sharpened blade done for me by my local sharpener - about
$60 for a good quality blade. I use it for nothing else.
Some folks have indicated that a rip blade would work. Mine doesn't,
though.
ATB and ATBR blades are there to give crisper edges to the cuts. The
shape of the 'bottom' matters very little in a through cut.
Patriarch
The saw blade you have has teeth ground to what is called Alternate Top Bevel,
which leaves the distinctive kerf bottom you see. This is common for general
purpose, crosscut blades. Only rip blades have teeth ground flat-topped, and rip
blades are no good for cross-cutting, especially for the burrs you are trying to
make. A blade with an ATB+R grind has a combination of the ATB teeth and the
flat teeth, and could be what you are looking for. A well sharpened blade will
leave a nearly flat bottomed kerf, but the little wings at the outside edges of
the cut will probably still be noticeable. Since you are making burr puzzles,
I'll assume you are really cutting wider grooves, using multiple cut of the saw
blade. For this application, you really want a good dado set to get a wide, flat
bottomed cut.
Have you seen http://www.johnrausch.com/PuzzlingWorld/chap23.htm
where woodworking for making burr puzzles is discussed in detail?
--
JeffB
remove no.spam. to email
[email protected] wrote:
> So what gives? Do any blades cut a square-bottomed groove like
> this:
Any blade with flat top teeth; i.e., a rip blade. Yours is alternate
top bevel and is meant for crosscutting.
--
dadiOH
____________________________
dadiOH's dandies v3.06...
...a help file of info about MP3s, recording from
LP/cassette and tips & tricks on this and that.
Get it at http://mysite.verizon.net/xico
http://www.thewoodshop.20m.com/sawblades.htm
Clint
<[email protected]> wrote in message
news:[email protected]...
>I made a wooden burr puzzle the other day and noticed that the blade
> doesn't cut a square-bottomed groove. An exaggeration of the cut looks
> similar to this:
>
> | |
> | |
> | |
> |__/ \__|
>
> I looked at the blade tips and sure enough they're not squared, but
> angled. I thought it was maybe the crappy stock blade I got with my
> TS, but a trip to HD showed me that all blade have tips like this.
>
> So what gives? Do any blades cut a square-bottomed groove like this:
>
> | |
> | |
> | |
> |_______|
>
> Mike
>
In article <[email protected]>,
<[email protected]> wrote:
>I made a wooden burr puzzle the other day and noticed that the blade
>doesn't cut a square-bottomed groove. An exaggeration of the cut looks
>similar to this:
>
>| |
>| |
>| |
>|__/ \__|
>
>I looked at the blade tips and sure enough they're not squared, but
>angled. I thought it was maybe the crappy stock blade I got with my
>TS, but a trip to HD showed me that all blade have tips like this.
>
>So what gives? Do any blades cut a square-bottomed groove like this:
>
>| |
>| |
>| |
>|_______|
>
>Mike
>
You might be able to find a rip blade that does, or a decent
sharpening shop could grind one that way. Of course, it would be prone
to splintering the wood when used to crosscut.
--
Larry Wasserman Baltimore, Maryland
[email protected]