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#1
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Lay out a sine curve?
I'm making a wine rack:
http://www.uniqueprojects.com/projec...k/winerack.htm and I was wondering how to lay out that sine curve on the piece of wood to cut it. At first I thought of using a disk of some sort, but that would yield a series of half-circles. If I can't finger this one out, that's probably what I'll wind up doing, but I was wondering if y'all had done something like this. Thanks, -Phil Crow |
#2
Posted to rec.woodworking
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Lay out a sine curve?
wrote in message oups.com... I'm making a wine rack: http://www.uniqueprojects.com/projec...k/winerack.htm and I was wondering how to lay out that sine curve on the piece of wood to cut it. At first I thought of using a disk of some sort, but that would yield a series of half-circles. If I can't finger this one out, that's probably what I'll wind up doing, but I was wondering if y'all had done something like this. The plans give a link to the pattern that they used http://www.uniqueprojects.com/projects/winerack/3b.pdf Print and attach to the wood! Frank |
#3
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Lay out a sine curve?
Frank Ketchum wrote: The plans give a link to the pattern that they used http://www.uniqueprojects.com/projects/winerack/3b.pdf Print and attach to the wood! Frank D'oh! Must have missed that on the read-through. Boy, is my face red. However, the question remains--what if I wanted a curve with a different amplitude or wavelength? This template idea crossed my mind, but how to generate such a curve? Can Autocad do it? I've just received a copy of Autocad 2005, but really don't have much clue as to how to actually use it. I've bought the "for dummies" book, but haven't sat down and dug in yet. At any rate, thanks, Frank. |
#4
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Lay out a sine curve?
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#7
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Lay out a sine curve?
You can lay out a curve like this in Autocad just fine though, in Turbocad,
you can edit the shape in ways Autocad can't. "dnoyeB" wrote in message news:Ep- Sure, most CAD packages can do curve fitting or there not very much "CAD." I do it in turbocad. However, historically the problem with Autocad is that its more of a workbench. Its a corporate product and lots of the nifty features come in add-ons that you also have to pay for. But this particular feature should be built in. It may not be tweakable by the parameters you wish to tweak, but it can be done. |
#8
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Lay out a sine curve?
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#9
Posted to rec.woodworking
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Lay out a sine curve?
(in
) said: | However, the question remains--what if I wanted a curve with a | different amplitude or wavelength? This template idea crossed my | mind, but how to generate such a curve? Can Autocad do it? This is the easiest part of all. Draw a sinusoid (a sine or cosine curve) with any amplitude or wavelength, then stretch (or squash) to the amplitude and wavelength you want. Copy and paste as many cycles as you want. -- Morris Dovey DeSoto Solar DeSoto, Iowa USA http://www.iedu.com/DeSoto |
#10
Posted to rec.woodworking
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Lay out a sine curve?
In article .com, wrote:
I'm making a wine rack: http://www.uniqueprojects.com/projec...k/winerack.htm and I was wondering how to lay out that sine curve on the piece of wood to cut it. Well, you could do what they suggest in the plans: "You can use the pattern that we used by printing it out and transferring it to the wood in succession until you have the desired number of holes." -- Regards, Doug Miller (alphageek at milmac dot com) It's time to throw all their damned tea in the harbor again. |
#11
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Lay out a sine curve?
On 18 Feb 2006 06:59:47 -0800, wrote:
I'm making a wine rack: http://www.uniqueprojects.com/projec...k/winerack.htm and I was wondering how to lay out that sine curve on the piece of wood to cut it. For future reference, if you want a real sine curve, and not an approximation [within the bounds of the tools and shaky hands] use a math program like Graphmatica, then copy/paste into a word processor or image editor for printing to the scale you want/need. Graphmatica is shareware, but free for those who can't afford it [so just use it if you can't.] PhotoFiltre , or "The Gimp" are freeware image editors. OpenOffice is a great free office suite with a wordprocessor and spreadsheet and much more. If you do it intelligently, you can do it to suit your project scale. One hint: in Graphmatica type in y = sin(x) for the unit sine curve, and you might want to change the default colours to black and white. You can change the equation if you want varied results; something like y = 3sin(x) or y = sin(3x) or whatever. You likely don't need that though. Or, any basic trig text shows how to draw it from the unit circle. |
#12
Posted to rec.woodworking
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Lay out a sine curve?
What's the chances of someone throwing his wine rack up on comparator and
measuring the frequency and amplitude of it. The man said he had AutoCAD. Those curves can be drawn in about a minute. Close enough for a wine rack. "Guess who" wrote in message news On 18 Feb 2006 06:59:47 -0800, wrote: I'm making a wine rack: http://www.uniqueprojects.com/projec...k/winerack.htm and I was wondering how to lay out that sine curve on the piece of wood to cut it. For future reference, if you want a real sine curve, and not an approximation [within the bounds of the tools and shaky hands] use a math program like Graphmatica, then copy/paste into a word processor or image editor for printing to the scale you want/need. Graphmatica is shareware, but free for those who can't afford it [so just use it if you can't.] PhotoFiltre , or "The Gimp" are freeware image editors. OpenOffice is a great free office suite with a wordprocessor and spreadsheet and much more. If you do it intelligently, you can do it to suit your project scale. One hint: in Graphmatica type in y = sin(x) for the unit sine curve, and you might want to change the default colours to black and white. You can change the equation if you want varied results; something like y = 3sin(x) or y = sin(3x) or whatever. You likely don't need that though. Or, any basic trig text shows how to draw it from the unit circle. |
#13
Posted to rec.woodworking
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Lay out a sine curve?
Guess who wrote:
On 18 Feb 2006 06:59:47 -0800, wrote: I'm making a wine rack: http://www.uniqueprojects.com/projec...k/winerack.htm and I was wondering how to lay out that sine curve on the piece of wood to cut it. For future reference, if you want a real sine curve, and not an approximation [within the bounds of the tools and shaky hands] use a math program like Graphmatica, then copy/paste into a word processor or image editor for printing to the scale you want/need. [snip] Or, any basic trig text shows how to draw it from the unit circle. That's what I was going to suggest. It's easy, and you can easily scale the sine curve as large or small as you like by choosing an appropriately-sized circle. Since all that's required is a compass and straightedge you don't even have to leave the shop. |
#14
Posted to rec.woodworking
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Lay out a sine curve?
wrote in
oups.com: I'm making a wine rack: http://www.uniqueprojects.com/projec...k/winerack.htm and I was wondering how to lay out that sine curve on the piece of wood to cut it. At first I thought of using a disk of some sort, but that would yield a series of half-circles. If I can't finger this one out, that's probably what I'll wind up doing, but I was wondering if y'all had done something like this. Thanks, -Phil Crow In the days before computers and fancy stuff, we used nails, sheet metal or thin wood. Layout the points of the peaks and valleys (or wave points if you prefer) and spot a 4d nail at the point. Take the sheet metal ( 1" wide x 20 - 24 ga. ) and weave it through the nails. Trace the pattern and now you know the rest of the story. |
#15
Posted to rec.woodworking
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Lay out a sine curve?
On 18 Feb 2006 06:59:47 -0800, wrote:
I'm making a wine rack: http://www.uniqueprojects.com/projec...k/winerack.htm and I was wondering how to lay out that sine curve on the piece of wood to cut it. At first I thought of using a disk of some sort, but that would yield a series of half-circles. If I can't finger this one out, that's probably what I'll wind up doing, but I was wondering if y'all had done something like this. Thanks, -Phil Crow Make a template. Lay out a grid. Use a spreadsheet to plot points. Use a French curve to connect the dots. Read up on how to use a French curve. |
#16
Posted to rec.woodworking
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Lay out a sine curve?
wrote:
I'm making a wine rack: http://www.uniqueprojects.com/projec...k/winerack.htm and I was wondering how to lay out that sine curve on the piece of wood to cut it. At first I thought of using a disk of some sort, but that would yield a series of half-circles. If I can't finger this one out, that's probably what I'll wind up doing, but I was wondering if y'all had done something like this. You've had all sorts of answers for how to do this with various computer programs (or a pocket calculator), but here's another way that doesn't involve anything but a compass, straightedge and protractor, and you can lay it out directly on the board: 1.) Draw a horizontal line down the middle of where you want to put the sine curve, with the ends aligned with where you want the ends of the curve to go. Call this the "center line" 2.) Make marks (call them "section marks") to divide this line into equally-spaced sections, one section for each up-and-down-and-back-up of the sine curve that you want. Mark off divisions of each of the sections into 16ths. 3.) Set the compass to draw circles with a diameter equal to the height of the sine curve that you want to draw. Draw a half-circle centered at each end of the center line, so it looks sort of like a C at the right end and a reverse-C at the left end, and the center line goes from the center of one half-circle to the center of the other. 4.) With the protractor, mark off angles on each half circle, at every 45-degree point, and every 22.5-degree point between these. 5.) Draw lines parallel to the center line by connecting the tops and bottoms of the half-circles, and each corresponding pair of angle-marks. 6.) Go back to the marks you made in step 2. Starting at the left-hand end of the center line, draw a line perpendicular to the center line that goes all the way up to the top line. Put a dot where it crosses the top line. (You don't actually need to draw the perpendicular line; just draw the dot. But it's easier to explain if I say to draw the line.) 7.) Go to the right along the center line. For the next mark, draw another perpendicular line and dot, but put the dot where it crosses the second line from the top. For the next one, draw the dot on the third line, then the fourth, and so on. When you get to the bottom, start going back up. If you've counted right, you should get back to the top line when you get to the first section-mark. Keep going until you get to the other end. 8.) Connect the dots. If you're not good at sketching smooth lines, use a french curve or something. Obviously, the division into 16ths and the angles I picked are somewhat arbitrary -- just so long as you divide the sections on the center-line into twice as many divisions as you divide the half-circles into, it will work out. If you're using drafting triangles instead of a protractor, 12ths and marks at 30-degrees and 60-degrees will work well. Or, if you're good at sketching with only a few dots (I'm not), just make marks at 45 degrees and divide it into 8ths. Is that clear enough, or should I do up some sketches and post them? - Brooks -- The "bmoses-nospam" address is valid; no unmunging needed. |
#17
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Lay out a sine curve?
Brooks Moses wrote: ... Is that clear enough, or should I do up some sketches and post them? - Brooks -- The "bmoses-nospam" address is valid; no unmunging needed. That's a pretty good idea. Plotting points, but no need to calculate their values. Josh |
#18
Posted to rec.woodworking
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Lay out a sine curve?
I cheated once. Took a coffee can lid and made a hole very near the outside
edge for a pencil. Put a straight edge at the bottom where the sine wave was to go and rolled the lid across the straight edge, marking the plywood. The cutting and sanding were much, much more of a problem than the layout. I gave up after a few attempts, because even the smallest error is noticeable be everyone. Just a guess but the wine rack mentioned by OP might hide small errors in the sine wave due to other objects which would draw the eye. Phil You've had all sorts of answers for how to do this with various computer programs (or a pocket calculator), but here's another way that doesn't involve anything but a compass, straightedge and protractor, and you can lay it out directly on the board: 1.) Draw a horizontal line down the middle of where you want to put the sine curve, with the ends aligned with where you want the ends of the curve to go. Call this the "center line" 2.) Make marks (call them "section marks") to divide this line into equally-spaced sections, one section for each up-and-down-and-back-up of the sine curve that you want. Mark off divisions of each of the sections into 16ths. {snip} |
#19
Posted to rec.woodworking
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Lay out a sine curve?
Phil-in-MI wrote:
The cutting and sanding were much, much more of a problem than the layout. I gave up after a few attempts, because even the smallest error is noticeable be everyone. When I need to make a curved cut in a piece of wood, I make a pattern from 1/4" hardboard and pattern-route it. Hardboard is easy to cut and sand smooth and if you make a mistake or cut a little too deep, you can fill/repair it with a little 5 minute epoxy and file it smooth. Once the pattern is perfect and smooth with the curve I want, I attach it to the wood and route it. The end result is wonderful and perfect the *first* time with very little sanding. Plus, in some of my woodworking I often make many of the same items, several at a time over a period of time. The pattern allows to me to make perfect pieces time after time and very quickly. Joe Barta |
#21
Posted to rec.woodworking
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Lay out a sine curve?
The Guess who entity posted thusly:
That's a cycloid, not a sine. Still far and away the easiest is to use a graphing program like Graphmatica [download from archives.math.utk.edu ...it's awesome and free.] Type in y=sin(x) ENTER, and you then print from there or copy/paste into a word processor. Less than a minute if you have both programs up and running. Sounds interesting, but I have not been able to find it. Is that name correct? If so, would you happen to know what directory it's in? Thanks. |
#22
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Lay out a sine curve?
Oleg Lego wrote:
The Guess who entity posted thusly: That's a cycloid, not a sine. Still far and away the easiest is to use a graphing program like Graphmatica [download from archives.math.utk.edu ...it's awesome and free.] Type in y=sin(x) ENTER, and you then print from there or copy/paste into a word processor. Less than a minute if you have both programs up and running. Sounds interesting, but I have not been able to find it. Is that name correct? If so, would you happen to know what directory it's in? http://archives.math.utk.edu/softwar...ng/grmat/.html er -- email not valid |
#23
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Lay out a sine curve?
On Sun, 19 Feb 2006 21:50:26 -0600, Oleg Lego
wrote: That's a cycloid, not a sine. Still far and away the easiest is to use a graphing program like Graphmatica Sounds interesting, but I have not been able to find it. Is that name correct? If so, would you happen to know what directory it's in? The address is correct: http://archives.math.utk.edu Top right, Software section, click "Windows...." Choose "Graphing programs", and there find Graphmatica. It's labelled as shareware, but the author generously offers it free if not affordable. Click that, then choose grmat16n.zip for the latest Windows version. It will do for the shop, for the kids in high school, or in college and university. Type in a function as done normally: e.g. y = 2sin(x), no need for 2*sin(x) etc.. You can graph an ellipse as well, but that can be done as readily, and to scale in a simple but powerful CAD such as DeltaCad. Default is a coloured background, and coloured curves, but you can change that to white. You can do more than one in one shot. Tons more software there, but not for this forum. I just mentioned it for anyone wanting some usual or unusual math curve. |
#24
Posted to rec.woodworking
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Lay out a sine curve?
you could use something like this:
http://www.leevalley.com/wood/page.a...936,42958&ap=1 Christian wrote in message oups.com... I'm making a wine rack: http://www.uniqueprojects.com/projec...k/winerack.htm and I was wondering how to lay out that sine curve on the piece of wood to cut it. At first I thought of using a disk of some sort, but that would yield a series of half-circles. If I can't finger this one out, that's probably what I'll wind up doing, but I was wondering if y'all had done something like this. Thanks, -Phil Crow |
#25
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Lay out a sine curve?
Christian (in ) said:
| you could use something like this: | | http://www.leevalley.com/wood/page.a...1,42936,42958& ap=1 You'd probably want to find one with a smaller minimum radius. ;-) -- Morris Dovey DeSoto Solar DeSoto, Iowa USA http://www.iedu.com/DeSoto |
#26
Posted to rec.woodworking
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Lay out a sine curve?
Well, thanks everybody for the replies. Apparently there are about 15
ways to skin this particular push stick. -Phil Crow |
#27
Posted to rec.woodworking
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Lay out a sine curve?
In article .com,
says... I'm making a wine rack: http://www.uniqueprojects.com/projec...k/winerack.htm and I was wondering how to lay out that sine curve on the piece of wood to cut it. At first I thought of using a disk of some sort, but that would yield a series of half-circles. Well, sort of... This isn't a sine curve, but it's attractive, and easy to lay out with a disk: http://mathworld.wolfram.com/CurtateCycloid.html |
#28
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Lay out a sine curve?
wrote: I'm making a wine rack: http://www.uniqueprojects.com/projec...k/winerack.htm and I was wondering how to lay out that sine curve on the piece of wood to cut it. At first I thought of using a disk of some sort, but that would yield a series of half-circles. If I can't finger this one out, that's probably what I'll wind up doing, but I was wondering if y'all had done something like this. Found this for ya http://ferl.becta.org.uk/content_fil.../SineCurve.xls |
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