LCD for handset and 3D printing help needed

[Serg l]

I have done a quick draft, does it look like a good candidate?
https://drive.google.com/file/d/1Xd6pzuXVFUHUF1dC9Sl3Gq-ViYBu-rKJ/view?usp=sharing


How much space do we have under the LCD and can we have the spacer sticking
outside of the screen footprint? I made it 2 mm wide and 1.5 at the bottom
to accommodate the flat cable.

At the bottom I cut 1/4 of the hole, 0.5 mm. The walls cannot be too thin,
but might be okay with 1.6 width.

We can add pins or any other mounting features on the other side as
needed.

On Fri, Jun 1, 2018 at 1:51 AM, Mychaela Falconia <
mychaela.falconia at gmail.com> wrote:

> Hi Serg,
>
> > Can you make a handmade drawing of the spacer right over the page 6 of
> the
> > attached document? Just want to make sure that I understand the
> description
> > correctly.
>
> I printed that drawing page out on paper, marked it up and scanned my
> marked-up version:
>
> https://www.freecalypso.org/members/falcon/lcd/KD020C_
> drawing_marked_up.pdf
>
> I used a blue highlighter to mark where the spacer would go onto the
> back of the LCD module.  I also made two arrows with a pen to point
> out a feature of the original drawing which can be easily overlooked
> if you don't have a physical part in front of you.
>
> Basically I want the legs of the spacer to extend far enough to include
> the lower alignment pin, i.e., when the spacer is fitted to the LCD
> module, both of the module's alignment pins should go into corresponding
> matched holes in the spacer.  There is no exact constraint on how far
> the legs can extend past that lower alignment pin, but there would be
> no use in having them extend significantly past that lower pin: it is
> not shown directly in the drawing, only hinted by the two little lines
> I have pointed out with arrows, but the profile of the back of the
> module thins out just a tiny bit below those little lines, hence if
> the legs of the spacer were to extend the full 51.4 mm height of the
> module, there would be a gap between the lower ends of these legs and
> the module frame.  This is why I said originally that the length of
> each leg should be about 41 mm - going just below the lower alignment
> pin, but no further.
>
> Also note from the highlighted drawing that when the LCD module is
> mounted with its tail folded under, the wide part of this tail (the
> part that's 34.58 mm wide according to the drawing on the left) will
> extend a little bit into the area where the lower alignment pin
> resides.  This detail imposes a tight constraint on the width of our
> spacer legs: they cannot be too wide or else there would be no room
> for the folded-under tail to go in between.  But our spacer legs
> cannot be too narrow either, as they need to be wide enough to fully
> incorporate the holes for the alignment pins to go into.
>
> According to the original drawing, the diameter of each alignment pin
> is 1.00 mm, and the distance from the centre of each pin to the edge
> of the module frame is also 1.00 mm.  The implication is that the
> distance from the outer edge of the module frame to the inner edge of
> each alignment pin is 1.50 mm, giving us the lower bound on the width
> of our spacer legs.  The upper bound is 1.90 mm, the margin left by
> the wide part of the folded-under tail as given in the tail drawing on
> the left.  As you can see, it is very very tight.  I asked for 1.7 mm
> width as the middle of our tolerance window.
>
> > I can make few samples.
>
> I would greatly appreciate it.  Because it is so difficult to do this
> mechanical design going only by email verbiage and awkward drawings,
> if you are serious about helping with this project, I would be glad to
> send you one of my LCD samples so you can have an actual target LCD
> module in your hand to first properly visualize what is needed, and
> then to test-fit what you have 3D-printed.  If you are willing to do
> it, please resend me your current snail mail address off-list.
>
> TIA,
> Mychaela
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