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How to create this compound curve

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Forum topic by JoelB posted 1256 days ago 841 views 1 time favorited 3 replies Add to Favorites Watch
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JoelB

18 posts in 1998 days


1256 days ago

How would you go about creating one of the arms in the star pattern on this piece? I am thinking about trying to duplicate this for my self and would like your input. I am thinking about building an angled platform to place the piece at an ange on the RAS and then turn the head on the RAS 90 degrees and tilt it too and then pull it through the workpiece. Seems like a lot of trial and error to get the angles right. I plan on making one and then making a mold of it and duplicating it via the mold.

Would love input on this.

Here it is: http://www.horchow.com/store/catalog/prod.jhtml?itemId=cprod68480017&parentId=cat2540731&masterId=cat000010&index=6&cmCat=cat000000cat000001cat000010cat2540731

Thanks!


3 replies so far

View Loren's profile

Loren

7389 posts in 2273 days


#1 posted 1256 days ago

If you know how to work with molds, carve it out of a soft material. I
wouldn’t bother trying to figure out how to machine it from wood.
From the look of it the curves may be sheet metal.

-- http://lawoodworking.com

View TopamaxSurvivor's profile

TopamaxSurvivor

14721 posts in 2301 days


#2 posted 1256 days ago

The star patterns are intersecting sine waves. Not quite sure how you are thinking of cutting them.

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

View Dandog's profile

Dandog

249 posts in 1399 days


#3 posted 1256 days ago

well I would start by making my stock round, build a jig to put it on the table saw. rip cut it into the half-round. Then you just have to sand it or cut on the lathe with the depth stop that matches the contour of the half-round or little less.slap it back, tablesaw with a stop. Crosscut. Put it back, lathe, Do the contour on the lathe then back to the tablesaw crosscut repeat.that would take some serious time. You to find a way to make the contours all the same with the stop that hardest part. You figure that out you got it licked. Metal lathes have a Quill on the opposite end of the chuck. Set the depth stop, you got it.I take check and MasterCard. ;-)
you have to lay out equal increments on the bed of lathe. then you move the quill forward to the thickness of the piece. On the quill should look like the contour. The half-moon shape will develop as that’s cut out.

-- life an woodworking is one big experiment

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