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Re: plop auto cell 36 and 54 points bugfix [was: Re: [ATM] mirrorcell design]
All...
It seems to me that we are again talking about things
that can be computed and worried about which will
never be seen or felt in the real world.
Multi levels of triangles, each pivoted and carrying
another ( or several) levels of triangles are fine in
the computer but here in the real world, manufacturing
tolerances are going to negate the good effects of the
second or third layer of triangles.
Remember that we are talking of glass expansion and
bending in the sub nano-meter range and you are
building triangles and tilt mechanisms with parts that
have tolerances that are a thousand or a million times
worse not to mention the thermal and gravitational
effects on these dozens of "PLOP OPTIMIZED" cell
parts.
Sometimes it's good to step back and do a reality
check. The original plan was to build a telescope and
use it to view the Universe... Simplicity went away
when the first shortcut came into play. "Let's save a
few dollars or a few pounds by using xxxx instead of
the normal xxxx" After that, the savings disappeared
as well as the chance to realize the original plan.
You each have to decide if you want to build the
telescope or push the envelope.
Clear Skies to those that have decided to build their
scopes. The others don't need them.
Ken Hunter
--- Jeff Anderson-Lee <jonah@cs.berkeley.edu> wrote:
> I wrote:
>
> >Here as promised are some auto cell files for 36
> and 54 points. There
> >is nothing much magical about them. They are just
> .gr files with
> >specific names placed in a certain location that
> omit certain parameters
> >(such as diameter, thickness, and focal length and
> material type). I
> >won't make any claims that these are "the best
> possible cells" but they
> >should be relatively good and easy to construct.
>
> Unfortunately, if you leave out the focal length
> parameter as I did,
> Plop sometimes gets confused. (I could have sworn
> it worked for me before!)
> I've updated the files below so that they have all
> of the parameters needed,
> which Plop will override for you as you enter values
> in the auto cell mode.
>
> The rest is as before.
>
>
> >To save them start a new blank version of Plop, and
> click on the "Edit
> >as Text" tab. Ignore any warnings that appear
> (just click 'OK'). Next
> >replace the text in the window with the selected
> text from one of the
> >four files included below. Then (very important)
> click on the
> >"Comments" tab so that Plop will parse the text.
> Finally, use
> >"File/Save As" to save the file into the
> appropriate directory and
> >filename. The comments will give you a hint as to
> where to look on your
> >system. Repeat for the other three files.
> >
> >If you have problems with cutting and pasting these
> files into Plop in
> >text mode, I will make them available as a .zip
> archive for a time at
> >the following URL:
> >
> >http://www.cs.berkeley.edu/~jonah/autocell.zip
>
> Also updated.
>
> >
> >Cheers!
>
>
> [Watch me pull a rabbit out of my hat! This time for
> sure! -- Bullwinkle]
> --
>
> ;save as /Program
> Files/Lewis/GuiPlop/autocell/cell_5_0_0.gr
> ;36 point cell; 6*(1+2+3) points at r1-r2-r3
> var r1 0.2819
> var r2 0.605072
> var r3 0.886961
> diameter 1016
> focal-length 5080
> thickness 50.8
> n-mesh-rings 24
> rel-support-radii r1 r2 r3
> num-support 6 12 18
> basis-ring-size 6
> basis-ring-min 0
> optimize r1 0.01
> optimize r2 0.01
> optimize r3 0.01
> part triangle 3 point 0 0 point 0 1 point 1 1
> part triangle 3 point 1 0 point 2 0 point 2 1
> part triangle 3 point 1 2 point 2 2 point 2 3
> part triangle 3 point 1 3 point 2 4 point 2 5
> part bar 3 part 2 2 part 3 2
> part triangle 3 part 0 0 part 1 0 part 4 0
>
> ;save as /Program
> Files/Lewis/GuiPlop/autocell/cell_5_1_0.gr
> ;36 point cell; 4*(1+2+2+4) points at r1-r2-r3-r4
> with uneven angles
> var r1 0.225793
> var r2 0.509608
> var r3 0.683627
> var r4 0.903041
> var a2 23.0371
> var m2 0 - a2
> var a4 12.205
> var m4 0 - a4
> diameter 1016
> focal-length 5080
> thickness 50.8
> n-mesh-rings 24
> rel-support-radii r1 r2 r2 r3 r4 r4
> num-support 4 4 4 8 8 8
> support-angle 0 a2 m2 0 a4 m4
> basis-ring-size 4
> basis-ring-min 0
> optimize r1 0.01
> optimize r2 0.01
> optimize r3 0.01
> optimize r4 0.01
> optimize a2 1
> optimize a4 1
> part triangle 4 point 0 0 point 1 0 point 2 0
> part triangle 8 point 3 0 point 4 0 point 5 0
> part triangle 4 part 0 0 part 1 0 part 1 1
> part bar 1 part 2 0 part 2 1
>
> ;save as /Program
> Files/Lewis/GuiPlop/autocell/cell_6_0_0.gr
> ;simple 54 point constant angles cell
> var r0 0.216033
> var r1 0.4782
> var r2 0.672383
> var r3 0.886919
> diameter 1016
> focal-length 5080
> thickness 50.8
> n-mesh-rings 24
> rel-support-radii r0 r1 r2 r3
> num-support 6 12 12 24
> basis-ring-size 6
> basis-ring-min 0
> optimize r0 0.01
> optimize r1 0.01
> optimize r2 0.01
> optimize r3 0.01
> part triangle 6 point 0 0 point 1 0 point 1 11
> part triangle 12 point 2 0 point 3 1 point 3 0
> part triangle 6 part 0 0 part 1 0 part 1 11
> part bar 3 part 2 0 part 2 1
>
> ;save as /Program
> Files/Lewis/GuiPlop/autocell/cell_6_1_0.gr
> ;simple 54 point varying angles cell
> var r0 0.216033
> var r1 0.4782
> var r2 0.672383
> var r3 0.886919
> diameter 1016
> focal-length 5080
> thickness 50.8
> n-mesh-rings 24
> rel-support-radii r0 r1 r2 r3
> num-support 6 12 12 24
> support-angle 0 15 15 7.5
> basis-ring-size 6
> basis-ring-min 0
> optimize r0 0.01
> optimize r1 0.01
> optimize r2 0.01
> optimize r3 0.01
> part triangle 6 point 0 0 point 1 0 point 1 11
> part triangle 12 point 2 0 point 3 1 point 3 0
> part triangle 6 part 0 0 part 1 0 part 1 11
> part bar 3 part 2 0 part 2 1
>
>
>
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