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Cosine Wave Table

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Project by Dave Hair posted 303 days ago 3276 views 27 times favorited 30 comments Add to Favorites Watch

My cosine wave table was inspired by the wonderful work done by Nico Jose (see http://lumberjocks.com/projects/46821 ). He is an artist and I am a copycat, with modifications.

I used the cosine of every 5 degrees from 0 to 60 degrees as the distance from the origin (left or right end of the table) multiplied by the length of the top piece of wood to generate the wave shape. In other words, cosine of zero degrees is 1.0000 so the X-axis shift is 0.0. The cosine of 60° is 0.5000 so when multiplied by the width of the top (20” = 508 mm), gives an X-axis shift of 254 mm (or half way across the top). I worked in millimeters, finding it easier to to calculate in a spreadsheet than inches and fractions.

Angle COS mm from front edge

0 1.0000 0.0
5 0.9962 1.9
10 0.9848 7.7
15 0.9659 17.3
20 0.9397 30.6
25 0.9063 47.6
30 0.8660 68.1
35 0.8192 91.9
40 0.7660 118.8
45 0.7071 148.8
50 0.6428 181.5
55 0.5736 216.6
60 0.5000 254.0

Simply by flipping a second build of triangles one can complete the sequence to the back of the table. This particular table took four triangle sets to complete.

The woods that I selected are mostly the ‘common’ exotics like paduak, holly, sapele, purpleheart, canary wood, wenge, bloodwood, hickory, wormy walnut, ambrosia maple, mahogany, leopardwood and red palm (marvelous, splintery stuff).

I really liked Nico’s gaps in the top pieces, so I copied that too.

The pieces are held together with glue and pin nails. I had a great deal of mental difficulty staggering the ends of the tops (see the images) and also getting the angles of each piece correct. The spreadsheet that I used to calculate all of trigonometric requirements never quite matched the workshop reality.

However, without the Kreg miter gauge on the tablesaw, I don’t think I could have built it. That miter gauge was rock solid and right on. And making sure the tablesaw blade was truly vertical was absolutely essential (preaching to the choir here).

So it is sitting in a fairly dark room out of any hope of sunshine to avoid the fading of paduak and purpleheart for as long as possible.

Thanks again to Nico’s creativity.

-- JDHair





30 comments so far

View ChrisK's profile

ChrisK

1004 posts in 1667 days


#1 posted 303 days ago

Cool idea, I like the array of colors.

-- Chris K

View mds2's profile

mds2

229 posts in 530 days


#2 posted 303 days ago

Very cool. Could we see and end view?

View MarkTheFiddler's profile

MarkTheFiddler

1721 posts in 774 days


#3 posted 303 days ago

Oh Man – That is my favorite cocktail table—- EVER! I wish I hadn’t seen it so soon after completing mine. No matter – I’m inspired by the design. I’m already looking forward.

-- Thanks for all the lessons!

View gsimon's profile

gsimon

456 posts in 699 days


#4 posted 303 days ago

Nice juxtaposition between all the straight lines and the organic colors an curves
Well done!

-- Greg Simon

View CaptWalnut's profile

CaptWalnut

13 posts in 511 days


#5 posted 303 days ago

Very Good Job, this is exciting to look at.

-- To crush your enemies, to see them driven before you, and to hear the lamentation of their women

View hoss12992's profile

hoss12992

2450 posts in 479 days


#6 posted 303 days ago

Wow, this is amazing. Thanks for sharing

-- The Old Rednek Workshop https://www.facebook.com/theoldrednekworkshoptn

View exit116's profile

exit116

108 posts in 378 days


#7 posted 303 days ago

so cool, and never feel bad for borrowing ideas from people you think are smarter than you, that’s how we get as smart as them. Pablo Picasso said “Good artists copy, great artists steal”

-- Money: if you do not have fun earning it, have fun spending it, I do not enjoy spending it so I have fun earning it.

View oldnovice's profile

oldnovice

3520 posts in 1953 days


#8 posted 303 days ago

That is outstanding!

Colors, concept, and workmanship are all beautiful!

At first sight it looked massive but the end view proved differently.

-- "I never met a board I didn't like!"

View watermark's profile

watermark

391 posts in 528 days


#9 posted 303 days ago

Wow!

-- "He who has no dog, hunts with a cat" Portuguese proverb

View deon's profile

deon

2136 posts in 1611 days


#10 posted 302 days ago

Looks great!

-- Dreaming patterns

View aussiedave's profile

aussiedave

3014 posts in 410 days


#11 posted 302 days ago

A very cool looking table…great job.

-- Dave.......Keep calm and make more sawdust....

View BENTWOOD's profile

BENTWOOD

351 posts in 368 days


#12 posted 302 days ago

Very creative and love the color scheme!

-- http://www.bentwoodjewelrydesigns.com

View Dave Hair's profile

Dave Hair

8 posts in 556 days


#13 posted 302 days ago

Thanks for your nice comments Lumberjocks!

I missed the error of calling one of the woods ‘redblood’. Of course, it is bloodwood.

-- JDHair

View JoeinDE's profile

JoeinDE

355 posts in 1909 days


#14 posted 302 days ago

Outstanding.

-- A bad craftsmen blames his cheap #$%ing tools

View William's profile

William

8844 posts in 1428 days


#15 posted 302 days ago

Amazing and WOW!
Yep, everyone bout covered that didn’t they.
I don’t know what else to say because amazing is all that come to mind with this one.

-- http://wddsrfinewoodworks.blogspot.com/

showing 1 through 15 of 30 comments

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