Sine Curve lid

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Project by bluemax posted 04-21-2010 09:52 PM 3552 views 14 times favorited 21 comments Add to Favorites Watch

I thought that a box lid based on a sine curve would make for a pleasing shape. This is a visual indication of how I did it. I cut about 30 pieces of wood 1/4X1/4. I made a glueing jig to hold them in the correct orientation. I glued them together in batches of two, moving from left to right. When the lid was finished I smoothed it out using a die grinder, then a file until I was happy with the curves, then sanded it.

-- Bluemax - Risk is necessary!

21 comments so far

View Michael Murphy's profile

Michael Murphy

453 posts in 3176 days

#1 posted 04-21-2010 09:57 PM

Neat. Wavy. Can you bandsaw the pattern on the one side then use the offcut for the other side?

-- Michael Murphy, Woodland, CA.

View bluemax's profile


35 posts in 3375 days

#2 posted 04-21-2010 10:10 PM

It took me a few moments to understand what you’re saying. Yes, that would work but the lid that I made is a little different than you would get building it that way. Using your design the “wave” would continue across the box so that the high point of the curve would be consistent across the lid as would the trough of the curve. In mine the curve pivots about the centre line so that the high piont on one side of the lid is the low point on the other side. Both sides of the lid show a sine curve but each side is opposite to the other.

-- Bluemax - Risk is necessary!

View blackcherry's profile


3338 posts in 3994 days

#3 posted 04-21-2010 10:22 PM

This is a sweet blog on how to…thanks for sharing, can’t wait to see the completed box…Blkcherry

View BritBoxmaker's profile


4611 posts in 3207 days

#4 posted 04-21-2010 10:54 PM

Beautiful curve that one. Making the box sides should be interesting. I think I’d use copy routing with the lid as the template. I’d be very interested to see how you will do it.


-- Martyn -- Boxologist, Pattern Juggler and Candyman of the visually challenging.

View KayBee's profile


1083 posts in 3417 days

#5 posted 04-21-2010 10:57 PM

Very cool. Can’t wait to see the rest of the box!

-- Karen - a little bit of stupid goes a long way

View TopamaxSurvivor's profile


18379 posts in 3847 days

#6 posted 04-21-2010 11:59 PM

I like it, Great idea.

-- Bob in WW ~ "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

View Kent Shepherd's profile

Kent Shepherd

2718 posts in 3457 days

#7 posted 04-22-2010 12:21 AM



View Jason's profile


659 posts in 3679 days

#8 posted 04-22-2010 12:41 AM

Cool work. It looks like the other side of you jig is flat. How do you get the curve on both ends?

-- Jason - Colorado Springs

View Blake's profile


3443 posts in 4045 days

#9 posted 04-22-2010 01:10 AM

Great idea!

-- Happy woodworking!

View bluemax's profile


35 posts in 3375 days

#10 posted 04-22-2010 01:53 AM

Jason, If you look at the jig you’ll see that there is a spine about 2 1/2 inches from the edge. Consider that the X axis. The curve of the sine curve is attached to the edge. It goes from 0 parrallel to the X axis to +1, back to zero, down to -1, back to 0, up to +1 and ends back at zero. The staves of the top are laid across the spine so that they just touch the curve on the outside of the jig. Because the staves are touching the jig at two points, the X axis and the curve the end not on the jig will be as far below the X axis as the end touching the curve is above.

-- Bluemax - Risk is necessary!

View Dennisgrosen's profile


10880 posts in 3286 days

#11 posted 04-22-2010 03:27 AM

a fantastic looking lid
canĀ“t wait to se the
finished box
and a great toturial
on how you made it
if the box is that complicated
as the lid I hope you
will make a blog on that
as well


View bigike's profile


4054 posts in 3459 days

#12 posted 04-22-2010 03:41 AM

great work, that’s gonna be a smooth looken box. Can’t wait to see it done.

-- Ike, Big Daddies Woodshop,

View Jason's profile


659 posts in 3679 days

#13 posted 04-22-2010 04:28 PM

Oh now I see. I went to the zoom pictures this time and see the spine now. Before I thought there was just the one flat piece screwed down.
Also looking forward to the final box. Keep it up.

-- Jason - Colorado Springs

View buckeyedudes's profile


155 posts in 3299 days

#14 posted 04-23-2010 01:06 AM

Now that’s thinking out of the box!

Good ‘idear’ B-Max.

-- Before you louse it up, THIMK!

View WistysWoodWorkingWonders's profile


12758 posts in 3328 days

#15 posted 04-28-2010 02:31 AM

nice work… thanks for the blog on how it’s done… cool looking lid work..

-- New Project = New Tool... it's just the way it is, don't fight it... :)

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