Need to figure out angle
 

I need to figure out the taper angle on a piece of wood. Can someone
help me out?? The piece is 18 7/16" long. The top is 1 11/16" wide and
the bottom is 2 3/16" wide. What angle would I need to cut that?

Thanks

writes:
I need to figure out the taper angle on a piece of wood. Can someone
help me out?? The piece is 18 7/16" long. The top is 1 11/16" wide and
the bottom is 2 3/16" wide. What angle would I need to cut that?

Looks like 1.5534 degrees. Note that it's often easier to build a jig
with the 1/2" offset than to accurately set your saw to 1.5536
degrees.

On 27 Dec 2004 11:20:45 -0800, wrote:

I need to figure out the taper angle on a piece of wood. Can someone
help me out?? The piece is 18 7/16" long. The top is 1 11/16" wide and
the bottom is 2 3/16" wide. What angle would I need to cut that?

Are you sure you really need the actual angle? Most times a job on a
long-'n-thin piece is done with reference to the dimensions you gave;
not the angle. For one thing, there's far too much margin for error
trying to set such an angle; any error is magnified dramatically over
the length of the work piece.

Also, using a bevel gauge and transferring the angle with it yields
good results, too, if you're trying to fit an adjoining piece.


- -
LRod

Master Woodbutcher and seasoned termite

Shamelessly whoring my website since 1999

http://www.woodbutcher.net

wrote:
I need to figure out the taper angle on a piece of wood. Can someone
help me out?? The piece is 18 7/16" long. The top is 1 11/16" wide
and
the bottom is 2 3/16" wide. What angle would I need to cut that?

Doesn't anybody know how to do simple trig anymore?

Basically you have a 1/2" taper (2 3/16 - 1 11/16") over 18 7/16" long
piece

inv cosine (.5/18.4375)
=88.44 deg.

or 1.56 deg, depending on how you want to measure it.

I am bulding a Guitar Neck so I need that exact angle. I was going to
cut it on my table saw.


wrote:
wrote:
I need to figure out the taper angle on a piece of wood. Can
someone
help me out?? The piece is 18 7/16" long. The top is 1 11/16" wide
and
the bottom is 2 3/16" wide. What angle would I need to cut that?

Doesn't anybody know how to do simple trig anymore?

Basically you have a 1/2" taper (2 3/16 - 1 11/16") over 18 7/16"
long
piece

inv cosine (.5/18.4375)
=88.44 deg.

or 1.56 deg, depending on how you want to measure it.

In article . com,
wrote:
I need to figure out the taper angle on a piece of wood. Can someone
help me out?? The piece is 18 7/16" long. The top is 1 11/16" wide and
the bottom is 2 3/16" wide. What angle would I need to cut that?

Thanks


I believe that would be arctan(0.5 / (18 7/16) ) But I am curious why
you need to know the angle. You can cut it from the measurements you
have.


--

Larry Wasserman Baltimore, Maryland

Duane Bozarth wrote:

wrote:

I need to figure out the taper angle on a piece of wood. Can someone
help me out?? The piece is 18 7/16" long. The top is 1 11/16" wide and
the bottom is 2 3/16" wide. What angle would I need to cut that?

Eyeball... :)

Seriously for a piece like that, I would simply measure where I wanted
it, mark it and cut by hand w/ the bandsaw (or a skill saw if didn't
have the bandsaw) and then just bring to the line on the jointer...

Of course, if it's a repetitive operation, a sled for the TS w/ a 1/2"
offset is worth the time...

On 27 Dec 2004 11:56:15 -0800, wrote:

I am bulding a Guitar Neck so I need that exact angle. I was going to
cut it on my table saw.

I've never seen a table saw with a tilt scale worth a damn.

make a test cut, nudge the saw, repeat.






wrote:
wrote:
I need to figure out the taper angle on a piece of wood. Can
someone
help me out?? The piece is 18 7/16" long. The top is 1 11/16" wide
and
the bottom is 2 3/16" wide. What angle would I need to cut that?

Doesn't anybody know how to do simple trig anymore?

Basically you have a 1/2" taper (2 3/16 - 1 11/16") over 18 7/16"
long
piece

inv cosine (.5/18.4375)
=88.44 deg.

or 1.56 deg, depending on how you want to measure it.

On 27 Dec 2004 11:42:48 -0800, "
wrote:


Doesn't anybody know how to do simple trig anymore?

Unfortunately, no. (At least, not I.) For some things I was never smarter
than the day I graduated HS/college/grad school.

The taper angle is .7768 degrees. Just the the Tangent Opposite Adjacent trig method.

Jim

DJ Delorie wrote:

writes:
I need to figure out the taper angle on a piece of wood. Can someone
help me out?? The piece is 18 7/16" long. The top is 1 11/16" wide and
the bottom is 2 3/16" wide. What angle would I need to cut that?

Looks like 1.5534 degrees. Note that it's often easier to build a jig
with the 1/2" offset than to accurately set your saw to 1.5536
degrees.
Sounds like you would need 1/4" offset on each side to keep
the grain straight with the neck, otherwise the grain will
be parallel to one side.

--
Gerald Ross
Cochran, GA

I am a mental tourist. My mind wanders.

On 27 Dec 2004 11:20:45 -0800, wrote:
I need to figure out the taper angle on a piece of wood. Can someone
help me out?? The piece is 18 7/16" long. The top is 1 11/16" wide and
the bottom is 2 3/16" wide. What angle would I need to cut that?

Thanks


"The angle of the piece"

Anything else is trying to calculate an angle from measurements, which
are necessarily imprecise, doing icky decimal arithmetic, which is also
imprecise.

Instead what you do is say, "Who CARES what the *expletive deleted*
angle is? I'll just set my taper jig so that it matches the workpiece."

Or the sliding bevel or whatever measuring tool is right for the job.

VERY small errors magnify greatly over the length of your piece.
Measure direct and save your hair.

Jim wrote:

The taper angle is .7768 degrees. Just the the Tangent Opposite Adjacent trig method.

I'm perfectly capable of figuring that out, it just is the hard way to
do it...what you gonna' use to set 0.78 degrees? Meanwhile you can
measure 1/2" pretty darn close pretty quick. Or, since OP added that
he's making the neckpiece for a git-tar, he'll want to taper it half on
each side as someone else noted. That would be 0.39 degree, even
tougher to set w/ anything...

IMO, YMMV, $0.02, etc....

On 27 Dec 2004 11:20:45 -0800, wrote:

I need to figure out the taper angle on a piece of wood. Can someone
help me out?? The piece is 18 7/16" long. The top is 1 11/16" wide and
the bottom is 2 3/16" wide. What angle would I need to cut that?

[2 3/16 - 1 11/16] / [18 7/16]is the tangent of the angle. But do as
thet say, and make a jig: Nail a crosscut runner strip to plywood and
cut through the saw. Lay out the piece to be cut with markings along
the new cut plywood edge. Tack more runner strips to hold it in
place, and run through the saw. Ain't no way I'm trying ASCII art.

wrote:

I need to figure out the taper angle on a piece of wood. Can someone
help me out?? The piece is 18 7/16" long. The top is 1 11/16" wide and
the bottom is 2 3/16" wide. What angle would I need to cut that?

Thanks

If you use a taper jig you don't need to figure out the angle. See:

http://www.newwoodworker.com/usetaperjig.html

--
Jack Novak
Buffalo, NY - USA
(Remove "SPAM" from email address to reply)

U-CDK_CHARLES\Charles wrote:

VERY small errors magnify greatly over the length of your piece.
Measure direct and save your hair.

Case in point, drilling a hole through a plane tote. I tried to use an
absolute angle instead of just whatever in between angle the actual thing
was supposed to be. I whined about the result on some other thread. Right
through the side of a piece I had spent hours shaping. sigh

--
Michael McIntyre ---- Silvan
Linux fanatic, and certified Geek; registered Linux user #243621
http://www.geocities.com/Paris/Rue/5407/
http://rosegarden.sourceforge.net/tutorial/

On 27 Dec 2004 11:42:48 -0800, "
wrote:


wrote:
I need to figure out the taper angle on a piece of wood. Can someone
help me out?? The piece is 18 7/16" long. The top is 1 11/16" wide
and
the bottom is 2 3/16" wide. What angle would I need to cut that?


Doesn't anybody know how to do simple trig anymore?

Apparently some one does the second post of this thread already
figured out the angle.....


Basically you have a 1/2" taper (2 3/16 - 1 11/16") over 18 7/16" long
piece

inv cosine (.5/18.4375)
=88.44 deg.

or 1.56 deg, depending on how you want to measure it.

On Mon, 27 Dec 2004 23:21:31 -0800, Don Foster
wrote:
On 27 Dec 2004 11:42:48 -0800, "
wrote:


wrote:
I need to figure out the taper angle on a piece of wood. Can someone
help me out?? The piece is 18 7/16" long. The top is 1 11/16" wide
and
the bottom is 2 3/16" wide. What angle would I need to cut that?


Doesn't anybody know how to do simple trig anymore?

Apparently some one does the second post of this thread already
figured out the angle.....


The trig isn't the problem.

It's setting a taper guide to the angle I get when I crunch the numbers.

If I were setting up a machine to make the part, I'd calculate it,
though I'd probably adjust my dimensions so the angle came out a round
number.

This is reproducing the angle on another part, so the actual number
doesn't matter so much as "getting it right."

On 27 Dec 2004 11:20:45 -0800, wrote:

I need to figure out the taper angle on a piece of wood. Can someone
help me out?? The piece is 18 7/16" long. The top is 1 11/16" wide and
the bottom is 2 3/16" wide. What angle would I need to cut that?

Thanks

A diagram would certainly clarify, but depending on the interpretation
of the "long" measurement given two calculations are provided.

For a trapezoid of height 18 7/16", the angle between the sloped sides
is

(tan-1(0.25/18.4375))*2 ~= 1.5536886 degrees


For a trapezoid of side length is 18 7/16", the angle between the
sloped sides is

(sin-1(0.25/18.4375))*2 ~= 1.5538314 degrees

On Thu, 30 Dec 2004 01:25:54 GMT, Phisherman wrote:

On 27 Dec 2004 11:20:45 -0800, wrote:

I need to figure out the taper angle on a piece of wood. Can someone
help me out?? The piece is 18 7/16" long. The top is 1 11/16" wide and
the bottom is 2 3/16" wide. What angle would I need to cut that?

Thanks

A diagram would certainly clarify, but depending on the interpretation
of the "long" measurement given two calculations are provided.

For a trapezoid of height 18 7/16", the angle between the sloped sides
is

(tan-1(0.25/18.4375))*2 ~= 1.5536886 degrees


For a trapezoid of side length is 18 7/16", the angle between the
sloped sides is

(sin-1(0.25/18.4375))*2 ~= 1.5538314 degrees

If you wanted to get really fussy, you might have included the
diagonal? You raise a good point, but I'm pretty sure he meant the
perpendicular distance.

"U-CDK_CHARLES\Charles" "Charles wrote in message
news:F9fAd.16645$EL5.11383@trndny09...

The trig isn't the problem.

It's setting a taper guide to the angle I get when I crunch the numbers.

If I were setting up a machine to make the part, I'd calculate it,
though I'd probably adjust my dimensions so the angle came out a round
number.

This is reproducing the angle on another part, so the actual number
doesn't matter so much as "getting it right."

For an easy way to set angles very precisly, see "sine bar" on my website.

www.kc7nod.20m.com