11-point Divider

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Introduction: 11-point Divider

I was working on a project (alcohol stove) where I wanted to divide a length into multiple equal parts. My past experience from navigation had me looking for a set of 11 point dividers to buy, but the price was prohibitive (a couple hundred $ for a small metal set). Thus I thought to build a set using Autocad for design and a K40 laser cutter.

Supplies

Materials:

1/8" or 3mm Birch plywood. 4" x 8" is more then enough

1/16" diameter, 9/32" long copper rivet, 37 total. Normally sold as pack of 50 for a little more than $5.

Tools:

Laser cutter

hammer, center punch, and hard surface to set rivets

Step 1: Cut the Parts

The attached dxf files are labeled by the part length (2,3,5,8, or 12 units) and and pointed end or not (not = "-"). You will need to cut out 1 each (1x) of the 2, 5, 8, and 12 unit length parts, and 7 each (7x) of the 3 unit length parts, or use the dividers2.dwg file for a complete set of parts. I also recommend cutting out spare parts just in case up need then later

Step 2: Putting the Parts Together

Initially, I tested out different types of fasteners. The 1/16" diameter by 9/32" long copper rivets work well with the 1/8" plywood and look nice. They were also about half the cost of the other recommended fastener which are nylon screws, which were cut down and melted.

Starting from the two 12 unit length pieces, rivet the wide ends together. I did this by placing the rivet in the end holes with both pieces together and using a center punch to expand the hollow center of the rivet then turning the pieces over and tapping lightly with a hammer with the rivet against a hard surface (anvil) to further expand and flatten the rivet.

Continue by adding the 8 unit length pieces, check the positioning of the pointed versus round end parts are on the same plane (all pointed parts on top or bottom when riveting) and the slope of the pointed ends are consistently on the same side (left or right side). Using the pictures as a guide, work from one side to the other riveting on the remaining parts.

Step 3: Test Them Out

I open and close them by gently pulling/pushing on the opposite sides of the points.

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    16 Comments

    0
    jeanniel1
    jeanniel1

    11 months ago

    Brilliant! Odd for dividing into 11 vs 12 - ha ha! I suppose you can make it divide to 12 and then just leave off one end. Great build! I'm going to use this!

    0
    PLLman
    PLLman

    11 months ago

    If you don't have a laser cutter to make something like this, there are age-old techniques using something called a sector rule that uses simple geometry, a straight edge and a divider to divider a length into any number of segments. I recommend consulting (and buying) "By Hand and Eye," by George R. Walker and Jim Tolpin. Fascinating stuff!

    0
    edmond
    edmond

    11 months ago

    Very good job!

    0
    BLK76
    BLK76

    Question 11 months ago on Step 3

    Do you have a source for the rivets?

    0
    BLK76
    BLK76

    Reply 11 months ago

    Thanks

    0
    the_tool_man
    the_tool_man

    11 months ago

    This is a great idea. I could certainly put one of these to good use around the workshop. Out of curiosity, could you have extended the other end to add a twelfth point?

    0
    nmartin
    nmartin

    Reply 11 months ago

    No, but with a re-design you could continue to add more and longer arms to add additional points. Just extending the long rounded arm will not give the correct spacing (it will be 2x if you have the point on the correct side). 11 points gives 10x spacings.

    0
    Pepsastre
    Pepsastre

    Reply 11 months ago

    11points is to make 10 parts... 12 will make 11... Quite odd, but possible.

    0
    DavidF15
    DavidF15

    Reply 11 months ago

    Looks like you'd just need to duplicate the longest arm.

    0
    T_Krabiel
    T_Krabiel

    11 months ago

    THIS IS AMAZING!!! you need to point out that these NOMRALY cost up to 200$

    0
    T_Krabiel
    T_Krabiel

    Reply 11 months ago

    Im sorry but I can not emphasis how great this is!!

    This is one that is cheap https://www.amnautical.com/products/6-ten-point-divider-weems-plath-719a?variant=34565589401764¤cy=USD&utm_medium=product_sync&utm_source=google&utm_content=sag_organic&utm_campaign=sag_organic&utm_campaign=gs-2020-04-22&utm_source=google&utm_medium=smart_campaign&gclid=CjwKCAjw_NX7BRA1EiwA2dpg0rt6BerobKHl1CiuZf0_i40ym-wXIFyZZast9HF19l7EomsZTu3rORoCMRcQAvD_BwE#.X3Xc12hKhNA

    0
    Makerneer
    Makerneer

    11 months ago

    Yes, thank you! I've been meaning to get around to making one like this with the extra top pivot points!

    0
    Penolopy Bulnick
    Penolopy Bulnick

    11 months ago

    Nice job on this! Thanks for sharing :)