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DPRG: Proposed wall design for contest

Subject: DPRG: Proposed wall design for contest
From: Brian Merritt brianlee at ultra1.dallas.net
Date: Sun Jul 13 21:59:37 CDT 1997

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As I said in the meeting yesterday I have a design idea for the walls
to be used in the contest next month.  On the way home from the 
meeting I stopped at Home Depot.  They sell a type of blue Styrofoam
that is about 1/2 inch think.  It is higher desity then the commom 
white Styrofoam that can be very brittle.  I went ahead and bought
a sheet to play around with.  Its only about $7.50 for a 4 x 8' sheet.
The blue stuff is not brittle, is easily cut with a utility knife, and
appears (so far) to hold together using common carpenter's glue.  I 
built 3 wall sections today to test the design.  They consist of 1-4ft
section and 2-2ft sections.
  
The design for the walls consists of "L" shaped (12"h x 6"d) wall
sections that can connected in various lengths and patterns to get
any wall configuration deisired (see attached drawing).  The wall are
connected together using pieces of the same material with slots cut
into them so that each connector can span two brackets, one from each
of two adjacent walls.  Inside corners are held together with small 
corner sections that attach to adjacent walls with the same types of
connectors as described above.  I made a couple of these corner
pieces and they work well.  An outside corner will require that
the two mating walls have those ends mitred at 45 deg.  I have not
made any walls with these types of ends, but I do not feel that
they will be any big problem to construct.  There is a Powerpoint 3.0
drawing attached to this email that shows the basic idea.  Please
excuse the crudeness of the diagram, I am no draftsman, and I used
Microsoft software to prepare it.  

The advantages to this design are as follows -
 
1.  The material is cheap and widely available.
2.  Any member could construct there own walls for test purposes,
    or to add to the club's stock of walls.
3.  The walls are reuseable, and can be rearranged into different
    configurations as the contests change.
4.  The material is very light weight and stacks for storage and
    transport (36ft of walls made up of 6ft sections would could be
    stacked in an area about 12in x 18in x 6ft).
5.  The only materials required are foam, glue, toothpicks  
    (YES toothpicks), and tape to hold the parts while the glue drys.
6.  The walls will stand on their own and could even hold up to the
    impact of smaller robots (of course that would never happen!).

On the down side it would take several hours to construct the walls 
needed for the contest, but if a few of use worked on it
we should have no problem building them by the contest date. Also
don't know if any of the sensor types (sonar, IR, etc) might have 
trouble with sensing the material.  I have scraps if anyone would 
like to try it.  Look over the attachment and let me know what you
think.
     	      
    
Chow,
Brian    	
   
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