Star of David

Discussion in 'Open-Segment Turnings Forum' started by Frank Smith, Sep 27, 2017.

  1. Frank Smith

    Frank Smith Member

    Has anyone designed a disk for the bottom of a segmented bowl that has a Star of David? If so, would you be willing to share your process?
     
  2. stuart johnson

    stuart johnson Super Moderator Staff Member

    I think this is something that could be designed using sketchup like Lloyd shows in one of his videos. I'm not that good with SU so I'm not sure of the steps. There would be several but much could be batch cut.

    (How's that for an I don't know answer?)
     
  3. Frank Smith

    Frank Smith Member

    Actually, that's very helpful! I was trying to figure out a way to do it with Lam Pro and it didn't occur to me to use SU. I'm not very good with SU either but I should be able to bang around on it and figure it out.

    Thanks Stuart!
     
  4. Lloyd Johnson

    Lloyd Johnson Administrator Staff Member

    Frank,

    You can design a six-sided star with Lamination PRO, but there isn't any way to make the lines making the border cross the center which is something you've probably already discovered.

    I'm afraid SketchUp isn't going to be much help either because even a stacked-wood process isn't likely to be a reasonable way to accomplish this.

    On solution is to find a friend with a CNC and use it to create the Star of David as channels and then fill them with some sort of filler. You could then use these as inserts in a porthole design such as that described by Malcolm Tibbetts in one of his books.

    I wish I could be of more help, but this star is just not a design that lends itself to multi-generation or wood stacking.

    Lloyd
     
  5. Frank Smith

    Frank Smith Member

    Thanks Lloyd! With my limited experience in LAM Pro is was able to do a normal star quite easily but didn't even know where to start on the Star of David.
     
  6. stuart johnson

    stuart johnson Super Moderator Staff Member

    I haven't done this so take it with a grain of salt. Us 1/4" stock for the Star of David, 1/2" stock for the background.
    1. Build two triangles the exact size and angle of the star.
    2. Place one triangle on the background, hold down with two sided tape.
    3. Out line the triangle with a sharp utility knife.
    4. Remove the triangle and use a sharp chisel and router plane to carefully remove all the wood outlined going just a little deeper than the 1/4" stock but just by a hair.
    5. Glue the triangle into the cut out.
    6. Carefully place the second triangle on top of the first positioning properly. Hold down with two sided tap.
    Repeat steps 4 and 5.
    7. Find the exact center of the two triangles and draw a circle the size you want.
    8. Sand all flat.

    Be sure and watch the grain and how the triangles will fit together and in the base when cutting the stock for the triangles.

    Like I said I have not done this but I think while several steps it wouldn't be that hard. The design will only show on one side, either inside the vessel or outside. In effect you are doing an inlay.

    Stu
     
  7. Frank Smith

    Frank Smith Member

    Thanks Stu. That sounds like a good approach.
     
  8. Bob Beaupre

    Bob Beaupre Administrator Staff Member

    Frank, here is a Star of David in Auto Cad format you should be able to scale it up or down to fit your needs.
    It's in DWG and DXF format
     

    Attached Files:

  9. Frank Smith

    Frank Smith Member

    Thanks Bob. This is the first time I've asked for help in this forum and you guys are all over it! Think I'll start asking some other things...:)
     
    Bob Beaupre likes this.
  10. Bob Beaupre

    Bob Beaupre Administrator Staff Member

    If you need help scaling it let me know
     
  11. Bob Beaupre

    Bob Beaupre Administrator Staff Member

    Frank, ask away everyone here is willing to help.
    Answers might not be correct but we try.........just kidding.

    We all do it a little different so you'll probable get different answers and then you have to decide how you want to do it. Sometimes it depends on what equipment you have, your skill level or what materials you have available.
     
    Frank Smith likes this.
  12. Frank Smith

    Frank Smith Member

    Thanks Bob! I've been turning for years but am just getting into segmented work (yes I know...yet another vortex)!
    I've done a few segmented things but am trying to learn how to do some more intricate feature rings. The SegPro and LamPro software are helping the design process immensely but I'm still learning the ins and outs of the software.
     
  13. Bob Beaupre

    Bob Beaupre Administrator Staff Member

    Lamination PRO can be a little of trial and error to get what you want in the beginning so patients is required.
     
  14. Frank Smith

    Frank Smith Member

    Yes, sometimes I get...shall we call them "interesting" designs in Lamination Pro!

    But I love it and Segment Pro. Both are very helpful.
     
  15. Rod Smith

    Rod Smith New Member

    I have made several 5 and 6 sided stars for bowl sides and bottoms. What I do is to take two square contrasting woods, tape them together using double sided tape and then draw a circle the size you want on the top board. Look up on the internet how to draw a pointed star using a compass. Draw all of your connecting lines and extend them to the edge of the board. Number each point inside and outside the outline of the star. Using a band saw cut from the board edge to where the two "v's" come together. Before you take the pieces apart, make sure you number the points on the bottom board the same as the top board is marked. Take the pieces apart and put together like a jigsaw puzzle matching the numbers on the points. The numbers on the bottom board needs to stay down and on the top board the numbers are up. This works great as the pieces fit together great and you end up with two bowl bottoms.
     
  16. Frank Smith

    Frank Smith Member

    Thanks Rod! I'll need to digest this but I think I follow your instructions.
     
  17. Bob Beaupre

    Bob Beaupre Administrator Staff Member

    Harald Nygaard likes this.
  18. Frank Smith

    Frank Smith Member

  19. Bob Beaupre

    Bob Beaupre Administrator Staff Member

    I'm in the process of experimenting with this also. I want to do something for the bottom of a bowl I am designing right now.
    This is my first effort at making one:
    IMG_20180121_171751062.jpg IMG_20180124_124857910.jpg
     
    Harald Nygaard likes this.
  20. Frank Smith

    Frank Smith Member

    That's looking good Bob!
     

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