[amsat-bb] 70 cm Lindenblad progress - notable support structure for parasitic elements

[Curt Laumann]

Sure Stefan, et al, I'd be happy to share the STL file.  I used FreeCAD and
will make those files available as well.  I'm sure others can further
improve the design.

I printed this part out of eSun PLA+, but a better choice for outside use
might be PETG.

Regards,

Curt / K7ZOO
Tucson AZ

On Tue, Sep 22, 2020 at 6:07 PM Stefan Wagener <wageners at gmail.com> wrote:

> Very nice! Will you make the STL file available?
>
> 73 Stefan, VE4SW
>
> On Tue, Sep 22, 2020 at 7:46 PM Curt Laumann via AMSAT-BB <
> amsat-bb at amsat.org> wrote:
>
>> Hi All,
>>
>> Over the past few months I've been designing & assembling a few 70 cm
>> Lindenblads.  The current version is shown in the attached picture (link
>> below).  Arrow shafts are used for parasitic elements.  The shafts are
>> bonded in place with fiberglass resin.  Rubber end caps (from McMaster)
>> cover the shaft ends.
>>
>> The notable part of this design is the central structure (supporting
>> parasitic elements) is 3D printed as *one part*.  Virtually all of the
>> angles and spacings are achieved in the 3D printing process.  After
>> struggling to align and bond various PVC and irrigation parts in other
>> versions, it was a breeze to assemble this design:  one nylon machine
>> screw, one nut, four bonding points.
>>
>> The design could be easily modified to accommodate 0.125 inch diameter
>> parasitic elements as well.
>>
>> Regards,
>>
>> Curt / K7ZOO
>> Tucson AZ
>>
>>
>> https://drive.google.com/file/d/1i2c6T5lZtI00KChbJuyphvvechzBvlNw/view?usp=sharing
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>