Home |
Search |
Today's Posts |
|
Woodworking (rec.woodworking) Discussion forum covering all aspects of working with wood. All levels of expertise are encouraged to particiapte. |
Reply |
|
|
LinkBack | Thread Tools | Display Modes |
#1
Posted to rec.woodworking
|
|||
|
|||
For you math wizards
On 4/15/2013 12:20 PM, Leon wrote:
On 4/15/2013 11:10 AM, Gramp's shop wrote: Hah! Now all I need to do is figure out how to draw an arc with an 18 foot radius :-) I have a couple of ideas and will post pix of the process. On Monday, April 15, 2013 10:14:29 AM UTC-5, Gramp's shop wrote: I need to draw an arc for a piece of trim. The end points of the arc are 5 feet apart and the depth of the arc at the center point is 2 inches. What is the radius of the circle? There ought to be an equation for this that would be far superior to trial and error, oui? Larry !8' string with a pencil died around one end. Nail in the ground on the other end. Or use sketchup to print out a template. An 18 foot radius template? |
#2
Posted to rec.woodworking
|
|||
|
|||
For you math wizards
I need to draw an arc for a piece of trim. The end points of the arc are 5 feet apart and the depth of the arc at the center point is 2 inches. What is the radius of the circle?
There ought to be an equation for this that would be far superior to trial and error, oui? Larry |
#3
Posted to rec.woodworking
|
|||
|
|||
For you math wizards
On 4/15/2013 9:14 AM, Gramp's shop wrote:
I need to draw an arc for a piece of trim. The end points of the arc are 5 feet apart and the depth of the arc at the center point is 2 inches. What is the radius of the circle? There ought to be an equation for this that would be far superior to trial and error, oui? Larry http://www.mathopenref.com/arcradius.html |
#4
Posted to rec.woodworking
|
|||
|
|||
For you math wizards
On 4/15/2013 9:14 AM, Gramp's shop wrote:
I need to draw an arc for a piece of trim. The end points of the arc are 5 feet apart and the depth of the arc at the center point is 2 inches. What is the radius of the circle? There ought to be an equation for this that would be far superior to trial and error, oui? Larry http://www.handymath.com/cgi-bin/rad2.cgi?submit=Entry http://www.ehow.com/how_7846775_radius-arc.html http://mathcentral.uregina.ca/QQ/dat...leberger1.html http://www.woodweb.com/knowledge_bas...of_an_arc.html |
#5
Posted to rec.woodworking
|
|||
|
|||
For you math wizards
On 4/15/2013 10:14 AM, Gramp's shop wrote:
I need to draw an arc for a piece of trim. The end points of the arc are 5 feet apart and the depth of the arc at the center point is 2 inches. What is the radius of the circle? There ought to be an equation for this that would be far superior to trial and error, oui? Larry R=226" according to Sketchup. |
#6
Posted to rec.woodworking
|
|||
|
|||
For you math wizards
On 4/15/13 10:14 AM, Gramp's shop wrote:
I need to draw an arc for a piece of trim. The end points of the arc are 5 feet apart and the depth of the arc at the center point is 2 inches. What is the radius of the circle? There ought to be an equation for this that would be far superior to trial and error, oui? Larry According to those cool calculators, 18'10". -- -MIKE- "Playing is not something I do at night, it's my function in life" --Elvin Jones (1927-2004) -- http://mikedrums.com ---remove "DOT" ^^^^ to reply |
#7
Posted to rec.woodworking
|
|||
|
|||
For you math wizards
Hah! Now all I need to do is figure out how to draw an arc with an 18 foot radius :-) I have a couple of ideas and will post pix of the process.
On Monday, April 15, 2013 10:14:29 AM UTC-5, Gramp's shop wrote: I need to draw an arc for a piece of trim. The end points of the arc are 5 feet apart and the depth of the arc at the center point is 2 inches. What is the radius of the circle? There ought to be an equation for this that would be far superior to trial and error, oui? Larry |
#8
Posted to rec.woodworking
|
|||
|
|||
For you math wizards
On Mon, 15 Apr 2013 09:10:54 -0700, Gramp's shop wrote:
Hah! Now all I need to do is figure out how to draw an arc with an 18 foot radius :-) I have a couple of ideas and will post pix of the process. Bend a piece of thin cutoff around the points? -- When fascism comes to America, it will be wrapped in the flag and carrying a cross. |
#9
Posted to rec.woodworking
|
|||
|
|||
For you math wizards
"Gramp's shop" wrote: I need to draw an arc for a piece of trim. The end points of the arc are 5 feet apart and the depth of the arc at the center point is 2 inches. What is the radius of the circle? There ought to be an equation for this that would be far superior to trial and error, oui? -------------------------------------------------------------- Find a copy of Fred Bingham's book, "Practical Yacht Joinery" at the library. A very easy graphical solution is shown. I laid out all the deck cambers for my boat using it. Lew |
#10
Posted to rec.woodworking
|
|||
|
|||
For you math wizards
On 4/15/2013 11:10 AM, Gramp's shop wrote:
Hah! Now all I need to do is figure out how to draw an arc with an 18 foot radius :-) I have a couple of ideas and will post pix of the process. On Monday, April 15, 2013 10:14:29 AM UTC-5, Gramp's shop wrote: I need to draw an arc for a piece of trim. The end points of the arc are 5 feet apart and the depth of the arc at the center point is 2 inches. What is the radius of the circle? There ought to be an equation for this that would be far superior to trial and error, oui? Larry !8' string with a pencil died around one end. Nail in the ground on the other end. Or use sketchup to print out a template. |
#11
Posted to rec.woodworking
|
|||
|
|||
For you math wizards
On 4/15/2013 11:38 AM, Leon wrote:
On 4/15/2013 10:14 AM, Gramp's shop wrote: I need to draw an arc for a piece of trim. The end points of the arc are 5 feet apart and the depth of the arc at the center point is 2 inches. What is the radius of the circle? There ought to be an equation for this that would be far superior to trial and error, oui? Larry R=226" according to Sketchup. Trigonometry concurs. http://www.flickr.com/photos/gdguari...ream/lightbox/ Thanks to the O.P. for a pleasant lunchtime puzzle. |
#12
Posted to rec.woodworking
|
|||
|
|||
For you math wizards
On 4/15/2013 12:43 PM, Larry Blanchard wrote:
On Mon, 15 Apr 2013 09:10:54 -0700, Gramp's shop wrote: Hah! Now all I need to do is figure out how to draw an arc with an 18 foot radius :-) I have a couple of ideas and will post pix of the process. Bend a piece of thin cutoff around the points? My sense of the physics involved tells me that that method will not produce an arc of a circle. Will it matter? Might the resultant curve be subtly nicer than a circular arc? That's up to the designer. |
#13
Posted to rec.woodworking
|
|||
|
|||
For you math wizards
On 4/15/2013 1:41 PM, Greg Guarino wrote:
On 4/15/2013 11:38 AM, Leon wrote: On 4/15/2013 10:14 AM, Gramp's shop wrote: I need to draw an arc for a piece of trim. The end points of the arc are 5 feet apart and the depth of the arc at the center point is 2 inches. What is the radius of the circle? There ought to be an equation for this that would be far superior to trial and error, oui? Larry R=226" according to Sketchup. Trigonometry concurs. http://www.flickr.com/photos/gdguari...ream/lightbox/ Thanks to the O.P. for a pleasant lunchtime puzzle. It was more fun to try to work it out for myself, but I just looked it up and there is (of course) a more direct way to find it. Radius = H/2 + W^2/8H Where H = the height of the arc (2") and W= the width of the base (60") In our example that's: 2/2 + 60^2/8(2)= 1 + 3600/16 = 1 + 225 = 226 |
#14
Posted to rec.woodworking
|
|||
|
|||
For you math wizards
"Gramp's shop" wrote in news:384921f5-292d-40cc-9e3e-
: I need to draw an arc for a piece of trim. The end points of the arc are 5 feet apart and the depth of the arc at the center point is 2 inches. What is the radius of the circle? 224 inches There ought to be an equation for this that would be far superior to trial and error, oui? There is. radius squared = (radius minus height) squared + (half the distance between endpoints) squared In this case: r^2 = (r - 2)^2 + 30^2 r^2 = r^2 -4r +4 + 900 4r = 904 r = 226 |
#15
Posted to rec.woodworking
|
|||
|
|||
For you math wizards
On 04/15/2013 01:47 PM, Doug Miller wrote:
"Gramp's shop" wrote in news:384921f5-292d-40cc-9e3e- : I need to draw an arc for a piece of trim. The end points of the arc are 5 feet apart and the depth of the arc at the center point is 2 inches. What is the radius of the circle? 224 inches There ought to be an equation for this that would be far superior to trial and error, oui? There is. radius squared = (radius minus height) squared + (half the distance between endpoints) squared In this case: r^2 = (r - 2)^2 + 30^2 r^2 = r^2 -4r +4 + 900 4r = 904 r = 226 Now we know how long a piece of string is! |
#16
Posted to rec.woodworking
|
|||
|
|||
For you math wizards
My plan exactly, Larry. I'm going to start with drilling screws into the waste side of the end points and the top of the arc, attach a thin strip of one-by with spring clamps and then add a couple of screws/clamps along the arc.
The other Larry On Monday, April 15, 2013 11:43:27 AM UTC-5, Larry Blanchard wrote: On Mon, 15 Apr 2013 09:10:54 -0700, Gramp's shop wrote: Hah! Now all I need to do is figure out how to draw an arc with an 18 foot radius :-) I have a couple of ideas and will post pix of the process. Bend a piece of thin cutoff around the points? -- When fascism comes to America, it will be wrapped in the flag and carrying a cross. |
#17
Posted to rec.woodworking
|
|||
|
|||
For you math wizards
On 4/15/2013 2:47 PM, Doug Miller wrote:
"Gramp's shop" wrote in news:384921f5-292d-40cc-9e3e- : I need to draw an arc for a piece of trim. The end points of the arc are 5 feet apart and the depth of the arc at the center point is 2 inches. What is the radius of the circle? 224 inches There ought to be an equation for this that would be far superior to trial and error, oui? There is. radius squared = (radius minus height) squared + (half the distance between endpoints) squared In this case: r^2 = (r - 2)^2 + 30^2 r^2 = r^2 -4r +4 + 900 4r = 904 r = 226 I just drew that out. Clever. It's much more elegant solution than the one I posted. Good work. |
#18
Posted to rec.woodworking
|
|||
|
|||
For you math wizards
Greg Guarino wrote:
On 4/15/2013 11:38 AM, Leon wrote: On 4/15/2013 10:14 AM, Gramp's shop wrote: I need to draw an arc for a piece of trim. The end points of the arc are 5 feet apart and the depth of the arc at the center point is 2 inches. What is the radius of the circle? There ought to be an equation for this that would be far superior to trial and error, oui? Larry R=226" according to Sketchup. Trigonometry concurs. http://www.flickr.com/photos/gdguari...ream/lightbox/ Thanks to the O.P. for a pleasant lunchtime puzzle. Greg, We both drew the same picture. How much math background do you have (if you don't mind me asking)? Bill |
#19
Posted to rec.woodworking
|
|||
|
|||
For you math wizards
Gramp's shop wrote:
I need to draw an arc for a piece of trim. The end points of the arc are 5 feet apart and the depth of the arc at the center point is 2 inches. What is the radius of the circle? There ought to be an equation for this that would be far superior to trial and error, oui? Larry Pythagorean Theorem: 30^2 + (r-2)^2 = r^2. Solution is 226" exactly, which is 18' 10", as hasalready been disclosed,I believe. Didn't even need trig. (which surprised me). |
#20
Posted to rec.woodworking
|
|||
|
|||
For you math wizards
On 4/15/2013 3:26 PM, Bill wrote:
Greg Guarino wrote: On 4/15/2013 11:38 AM, Leon wrote: On 4/15/2013 10:14 AM, Gramp's shop wrote: I need to draw an arc for a piece of trim. The end points of the arc are 5 feet apart and the depth of the arc at the center point is 2 inches. What is the radius of the circle? There ought to be an equation for this that would be far superior to trial and error, oui? Larry R=226" according to Sketchup. Trigonometry concurs. http://www.flickr.com/photos/gdguari...ream/lightbox/ Thanks to the O.P. for a pleasant lunchtime puzzle. Greg, We both drew the same picture. How much math background do you have (if you don't mind me asking)? Bill Nothing too advanced. Algebra, geometry and trig in high school, a little calculus in college. That would all have been in the '70s. |
#21
Posted to rec.woodworking
|
|||
|
|||
For you math wizards
Subject
You math wizards are making a mountain out of a mole hill. Give me 10 minutes and some 1/4" hard board and I'll give you a finished template. I left my calculus in the class room the day I graduated more years ago than I want to admit. This is a case where a graphical solution wins hands down. Lew |
#22
Posted to rec.woodworking
|
|||
|
|||
For you math wizards
Gramp's shop wrote:
I need to draw an arc for a piece of trim. The end points of the arc are 5 feet apart and the depth of the arc at the center point is 2 inches. What is the radius of the circle? There ought to be an equation for this that would be far superior to trial and error, oui? Trial and error isn't needed, neither is knowing the radius of the arc's circle. Put two nails 5' apart in a piece of ply. Put another nail 2" above the line formed by the first two. Take a batten, bend it between the nails and draw the arc. -- dadiOH ____________________________ Winters getting colder? Tired of the rat race? Taxes out of hand? Maybe just ready for a change? Check it out... http://www.floridaloghouse.net |
#23
Posted to rec.woodworking
|
|||
|
|||
For you math wizards
On 4/15/13 4:32 PM, dadiOH wrote:
Gramp's shop wrote: I need to draw an arc for a piece of trim. The end points of the arc are 5 feet apart and the depth of the arc at the center point is 2 inches. What is the radius of the circle? There ought to be an equation for this that would be far superior to trial and error, oui? Trial and error isn't needed, neither is knowing the radius of the arc's circle. Put two nails 5' apart in a piece of ply. Put another nail 2" above the line formed by the first two. Take a batten, bend it between the nails and draw the arc. The potential flaws I see in that method are... ....you might get a peak/angle in the curve at the center nail ....you can't always count on getting equal bending at every point along the length of a piece of wood. I know it's a standard method to use a long, flexible piece and something to mark out a curve so I'm certain it works. I would just want to double check and practice a few times to make sure the bendable thing was bending equally. -- -MIKE- "Playing is not something I do at night, it's my function in life" --Elvin Jones (1927-2004) -- http://mikedrums.com ---remove "DOT" ^^^^ to reply |
#24
Posted to rec.woodworking
|
|||
|
|||
For you math wizards
"Larry Blanchard" wrote in message ...
On Mon, 15 Apr 2013 09:10:54 -0700, Gramp's shop wrote: Hah! Now all I need to do is figure out how to draw an arc with an 18 foot radius :-) I have a couple of ideas and will post pix of the process. Bend a piece of thin cutoff around the points? +1 |
#25
Posted to rec.woodworking
|
|||
|
|||
For you math wizards
"Greg Guarino" wrote in message ...
On 4/15/2013 3:26 PM, Bill wrote: Greg, We both drew the same picture. How much math background do you have (if you don't mind me asking)? Bill Nothing too advanced. Algebra, geometry and trig in high school, a little calculus in college. That would all have been in the '70s. Here's where my kids would ask "1870s or 1970s?" ;~) John ....of about the same vintage |
#26
Posted to rec.woodworking
|
|||
|
|||
For you math wizards
"-MIKE-" wrote in message ... On 4/15/13 4:32 PM, dadiOH wrote: Gramp's shop wrote: I need to draw an arc for a piece of trim. The end points of the arc are 5 feet apart and the depth of the arc at the center point is 2 inches. What is the radius of the circle? There ought to be an equation for this that would be far superior to trial and error, oui? Trial and error isn't needed, neither is knowing the radius of the arc's circle. Put two nails 5' apart in a piece of ply. Put another nail 2" above the line formed by the first two. Take a batten, bend it between the nails and draw the arc. The potential flaws I see in that method are... ...you might get a peak/angle in the curve at the center nail ...you can't always count on getting equal bending at every point along the length of a piece of wood. I know it's a standard method to use a long, flexible piece and something to mark out a curve so I'm certain it works. I would just want to double check and practice a few times to make sure the bendable thing was bending equally. -MIKE- Perhaps the curve could be checked by flipping the layout stick end for end? |
#27
Posted to rec.woodworking
|
|||
|
|||
For you math wizards
On 4/15/2013 12:47 AM, Richard wrote:
On 4/15/2013 12:20 PM, Leon wrote: On 4/15/2013 11:10 AM, Gramp's shop wrote: Hah! Now all I need to do is figure out how to draw an arc with an 18 foot radius :-) I have a couple of ideas and will post pix of the process. On Monday, April 15, 2013 10:14:29 AM UTC-5, Gramp's shop wrote: I need to draw an arc for a piece of trim. The end points of the arc are 5 feet apart and the depth of the arc at the center point is 2 inches. What is the radius of the circle? There ought to be an equation for this that would be far superior to trial and error, oui? Larry !8' string with a pencil died around one end. Nail in the ground on the other end. Or use sketchup to print out a template. An 18 foot radius template? Did he say wanted the full circle or the 5' arc? |
#28
Posted to rec.woodworking
|
|||
|
|||
For you math wizards
Gramp's shop wrote: I need to draw an arc for a piece of trim. The end points of the arc are 5 feet apart and the depth of the arc at the center point is 2 inches. What is the radius of the circle? There ought to be an equation for this that would be far superior to trial and error, oui? ------------------------------------------------ "dadiOH" wrote: Trial and error isn't needed, neither is knowing the radius of the arc's circle. Put two nails 5' apart in a piece of ply. Put another nail 2" above the line formed by the first two. Take a batten, bend it between the nails and draw the arc. --------------------------------------------------------------- Nice try but no cigar. The end result needed is a cambered beam shape which requires more than the three points you suggest. Bingham outlines the method that works in his book. Have used the method to define the deck cambers which varied from 10' to 16' in length for the boat I built. BTW, a batten is needed, I used a 3/4" x 3/4" x 1/16" x 96" aluminum angle which provides a knife edge for fairing out the profile with a fairing board. Lew |
#29
Posted to rec.woodworking
|
|||
|
|||
For you math wizards
Leon wrote:
On 4/15/2013 12:47 AM, Richard wrote: On 4/15/2013 12:20 PM, Leon wrote: On 4/15/2013 11:10 AM, Gramp's shop wrote: Hah! Now all I need to do is figure out how to draw an arc with an 18 foot radius :-) I have a couple of ideas and will post pix of the process. On Monday, April 15, 2013 10:14:29 AM UTC-5, Gramp's shop wrote: I need to draw an arc for a piece of trim. The end points of the arc are 5 feet apart and the depth of the arc at the center point is 2 inches. What is the radius of the circle? There ought to be an equation for this that would be far superior to trial and error, oui? Larry !8' string with a pencil died around one end. Nail in the ground on the other end. Or use sketchup to print out a template. An 18 foot radius template? Did he say wanted the full circle or the 5' arc? He said he wanted the 5' Chord! |
#30
Posted to rec.woodworking
|
|||
|
|||
For you math wizards
On 4/15/13 7:01 PM, Phil Kangas wrote:
Put two nails 5' apart in a piece of ply. Put another nail 2" above the line formed by the first two. Take a batten, bend it between the nails and draw the arc. The potential flaws I see in that method are... ...you might get a peak/angle in the curve at the center nail ...you can't always count on getting equal bending at every point along the length of a piece of wood. I know it's a standard method to use a long, flexible piece and something to mark out a curve so I'm certain it works. I would just want to double check and practice a few times to make sure the bendable thing was bending equally. -MIKE- Perhaps the curve could be checked by flipping the layout stick end for end? Good advice. -- -MIKE- "Playing is not something I do at night, it's my function in life" --Elvin Jones (1927-2004) -- http://mikedrums.com ---remove "DOT" ^^^^ to reply |
#31
Posted to rec.woodworking
|
|||
|
|||
For you math wizards
"Gramp's shop" wrote:
I need to draw an arc for a piece of trim. The end points of the arc are 5 feet apart and the depth of the arc at the center point is 2 inches. What is the radius of the circle? There ought to be an equation for this that would be far superior to trial and error, oui? Larry No trig or anything real advanced needed here. Merely that the square of the hypotenuse of a right triangle = the sum of the squares of the other two sides Picture your arc, and a line between the ends of the arc. Now draw another line from the center of your circle to the midpoint of the arc, and a third line from the circle center to one of the endpoints. Now if you have a circle of radius R, you have just drawn a right triangle with hypotenuse R, one side of R-2, and the other side of 30 (converting the 5-ft width to inches and dividing by 2. 30^2 + (R-2)^2 = R^2 900 + R^2 -4R + 4 = R^2 904 = 4R R=226" -- Alex -- Replace "nospam" with "mail" to reply by email. Checked infrequently. |
#32
Posted to rec.woodworking
|
|||
|
|||
For you math wizards
Bill wrote:
Leon wrote: Did he say wanted the full circle or the 5' arc? He said he wanted the 5' Chord! Actually, he said he wanted the radius so he could draw the arc. Arc, not chord. If he wanted to wind up with a 5' chord all he would need is a 5' straight edge. -- dadiOH ____________________________ Winters getting colder? Tired of the rat race? Taxes out of hand? Maybe just ready for a change? Check it out... http://www.floridaloghouse.net |
#33
Posted to rec.woodworking
|
|||
|
|||
For you math wizards
"dadiOH" wrote in :
Bill wrote: Leon wrote: Did he say wanted the full circle or the 5' arc? He said he wanted the 5' Chord! Actually, he said he wanted the radius so he could draw the arc. Arc, not chord. If he wanted to wind up with a 5' chord all he would need is a 5' straight edge. Bill's point is that the 5' dimension is the measurement of the chord, not the arc. |
#34
Posted to rec.woodworking
|
|||
|
|||
For you math wizards
On 4/15/2013 8:26 PM, Leon wrote:
On 4/15/2013 12:47 AM, Richard wrote: On 4/15/2013 12:20 PM, Leon wrote: On 4/15/2013 11:10 AM, Gramp's shop wrote: Hah! Now all I need to do is figure out how to draw an arc with an 18 foot radius :-) I have a couple of ideas and will post pix of the process. On Monday, April 15, 2013 10:14:29 AM UTC-5, Gramp's shop wrote: I need to draw an arc for a piece of trim. The end points of the arc are 5 feet apart and the depth of the arc at the center point is 2 inches. What is the radius of the circle? There ought to be an equation for this that would be far superior to trial and error, oui? Larry !8' string with a pencil died around one end. Nail in the ground on the other end. Or use sketchup to print out a template. An 18 foot radius template? Did he say wanted the full circle or the 5' arc? He really needs to make about 20 of them. To save time, he will array the stock in a regular twenty-sided polygon, presumably on the basketball court of the local high school. This will allow him to mark all of the pieces in one step with a string and pencil, or if the ceiling height is sufficient, a compass. |
#35
Posted to rec.woodworking
|
|||
|
|||
For you math wizards
On 4/16/2013 6:07 AM, Doug Miller wrote:
"dadiOH" wrote in : Bill wrote: Leon wrote: Did he say wanted the full circle or the 5' arc? He said he wanted the 5' Chord! Actually, he said he wanted the radius so he could draw the arc. Arc, not chord. If he wanted to wind up with a 5' chord all he would need is a 5' straight edge. Bill's point is that the 5' dimension is the measurement of the chord, not the arc. Actually LOL, I think Bill was filling me in with an accurate answer to my question that I posed to Richard. I was not really asking for an answer so to speak. I mentioned a template printed from Sketchup and Richard questioned an 18' radius template. I believe he was thinking about printing an 18' foot long template, maybe not. LOL The desk I just completed I useed the printing template technique for an 8' wide arc with a 36.83 foot radius and only used 8 sheets of paper. |
#36
Posted to rec.woodworking
|
|||
|
|||
For you math wizards
On 4/16/2013 10:05 AM, Leon wrote:
On 4/16/2013 6:07 AM, Doug Miller wrote: "dadiOH" wrote in : Bill wrote: Leon wrote: Did he say wanted the full circle or the 5' arc? He said he wanted the 5' Chord! Actually, he said he wanted the radius so he could draw the arc. Arc, not chord. If he wanted to wind up with a 5' chord all he would need is a 5' straight edge. Bill's point is that the 5' dimension is the measurement of the chord, not the arc. Actually LOL, I think Bill was filling me in with an accurate answer to my question that I posed to Richard. I was not really asking for an answer so to speak. I mentioned a template printed from Sketchup and Richard questioned an 18' radius template. I believe he was thinking about printing an 18' foot long template, maybe not. LOL The desk I just completed I useed the printing template technique for an 8' wide arc with a 36.83 foot radius and only used 8 sheets of paper. A few strips of hardboard screwed together, and that 18 foot template should come together in seconds! The OP may wish to include a micro-adjuster at one end. : ) Bill |
#37
Posted to rec.woodworking
|
|||
|
|||
For you math wizards
On 4/15/2013 10:10 AM, Gramp's shop wrote:
Hah! Now all I need to do is figure out how to draw an arc with an 18 foot radius :-) I have a couple of ideas and will post pix of the process. Two lengths of PVC pipe. Drill a hole in one end, attach a pencil to the other at 18'. Draw the arc on the ground, spiking the pivot end in the ground and putting the wood at the pencil end. |
#38
Posted to rec.woodworking
|
|||
|
|||
For you math wizards
On 4/16/2013 9:16 AM, Bill wrote:
On 4/16/2013 10:05 AM, Leon wrote: .... ... I mentioned a template printed from Sketchup and Richard questioned an 18' radius template. I believe he was thinking about printing an 18' foot long template, maybe not. LOL The desk I just completed I useed the printing template technique for an 8' wide arc with a 36.83 foot radius and only used 8 sheets of paper. A few strips of hardboard screwed together, and that 18 foot template should come together in seconds! The OP may wish to include a micro-adjuster at one end. : ) http://www.finewoodworking.com/how-to/articles/easier-joinery-for-curved-drawer-fronts.aspx Note picture UL 2nd page... -- |
#39
Posted to rec.woodworking
|
|||
|
|||
For you math wizards
Gramp's shop wrote: Hah! Now all I need to do is figure out how to draw an arc with an 18 foot radius :-) I have a couple of ideas and will post pix of the process. ========================================== "Just Wondering" wrote: Two lengths of PVC pipe. Drill a hole in one end, attach a pencil to the other at 18'. Draw the arc on the ground, spiking the pivot end in the ground and putting the wood at the pencil end. ========================================= You've obviously never done this. Lew |
#40
Posted to rec.woodworking
|
|||
|
|||
For you math wizards
Doug Miller wrote:
"dadiOH" wrote in : Bill wrote: Leon wrote: Did he say wanted the full circle or the 5' arc? He said he wanted the 5' Chord! Actually, he said he wanted the radius so he could draw the arc. Arc, not chord. If he wanted to wind up with a 5' chord all he would need is a 5' straight edge. Bill's point is that the 5' dimension is the measurement of the chord, not the arc. Ah, OK, got it. Mea culpa. -- dadiOH ____________________________ Winters getting colder? Tired of the rat race? Taxes out of hand? Maybe just ready for a change? Check it out... http://www.floridaloghouse.net |
Reply |
|
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Calling all math wizards... | Woodworking Plans and Photos | |||
For the Electrical Wizards.... | Home Repair | |||
Any Taig Wizards | Metalworking | |||
Any alarm wizards ? | UK diy | |||
Calling all math wizards | Woodturning |