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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 |
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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. |
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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 |
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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... |
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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. |
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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. |
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The taper angle is .7768 degrees. Just the the Tangent Opposite Adjacent trig method.
Jim |
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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. |
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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.... |
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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) |
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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/ |
#19
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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. |
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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." |
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#22
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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. |
#23
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"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 |
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