Commit 12990fc1 authored by Babken Chugaszyan's avatar Babken Chugaszyan

week4 week3 updated, final updated

parent 2602145f
Pipeline #108306 passed with stages
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......@@ -62,21 +62,25 @@
Ball Bearings to attach big gears to base and supports because they handle high loads. If you
want to learn more about types of bearings go <a
href="https://www.machinedesign.com/whats-difference-between/what-s-difference-between-bearings-1">here</a>.
I used:
<div class="row">
<div style="text-align: right;" class="col-4 col-12-medium">
<p> <br>Two <a href="https://www.skf.com/us/products/bearings-units-housings/ball-bearings/thrust-ball-bearings/single-direction/index.html?designation=51105">51105</a> Thrust ball bearings
</p>
I used:
<div class="row">
<div style="text-align: right;" class="col-4 col-12-medium">
<p> <br>Two <a
href="https://www.skf.com/us/products/bearings-units-housings/ball-bearings/thrust-ball-bearings/single-direction/index.html?designation=51105">51105</a>
Thrust ball bearings
</p>
</div>
<div class="col-4 col-12-medium">
<span class="image fit"><img src="../images/final/bearings.jpg" alt="bearings" /></span>
</div>
<div class="col-4 col-12-medium">
<p><br>Four <a
href="https://www.qualitybearingsonline.com/696zz-nsk-miniature-deep-groove-6x15x5mm/">696ZZ</a>
Ball Bearings for mounting the worm gears.
</p>
</div>
</div>
<div class="col-4 col-12-medium">
<span class="image fit"><img src="../images/final/bearings.jpg" alt="bearings" /></span>
</div>
<div class="col-4 col-12-medium">
<p><br>Four <a href="https://www.qualitybearingsonline.com/696zz-nsk-miniature-deep-groove-6x15x5mm/">696ZZ</a> Ball Bearings for mounting the worm gears.
</p>
</div>
</div>
</P>
<p>Here are Fusion 360 files:
<br><a href="../cad files/final/cnc/solartracker v2 v8.f3d">solartracker v2 v8.f3d</a>
......@@ -112,7 +116,8 @@
<p>I attached the legs to the base using hammer. Then I took M6 Hex Socket bolts and nuts to
attach the base spacer to the base.</p>
<span class="image main"><img src="../images/final/assembling.jpg" alt="assembling" /></span>
<p>It turned out that the heads of the bolts were too high and were preventing the other spacer to turn freely. So I tried some other bolts until I found the best for me.</p>
<p>It turned out that the heads of the bolts were too high and were preventing the other spacer to
turn freely. So I tried some other bolts until I found the best for me.</p>
<span class="image main"><img src="../images/final/assembling1.jpg" alt="assembling1" /></span>
<p></p>
<span class="image main"><img src="../images/final/assembling2.jpg" alt="assembling2" /></span>
......@@ -123,11 +128,16 @@
<p></p>
<span class="image main"><img src="../images/final/assembling5.jpg" alt="assembling5" /></span>
<h3>The Electronics --- Էլեկտրոնիկա</h3>
<p></p>
<p>At first I was thinking of using stepper motors to better understand how they work and how to use
them, but then I realised that with one bipolar stepper driver I can drive two DC
motors, so I changed my mind. At first glance my board may appear busy and complicated, but in
reality it's very simple.</p>
<span class="image main"><img src="../images/final/solar-pcb.png" alt="solar-pcb" /></span>
<p></p>
<p>It turned out that one ATtiny44 could do all the job, but I realised this too late. My system has
4 inputs (analog readings from LDRs) and 2 pairs of outputs for two DC motors. I thought
driving DC motors require analog pins but in reality it needs PWMs. </p>
<span class="image main"><img src="../images/final/sensor-pcb.png" alt="sensor-pcb" /></span>
<p>Here are the Freecad PCB files:
<p>Here are the Kicad PCB files:
<br><a href="../cad files/final/solar_v1 kicad.zip">solar_v1 kicad.zip</a>
<br><a href="../cad files/final/sensors kicad.zip">sensors kicad.zip</a>
<br>Here are png files of the PCBs:
......@@ -135,13 +145,13 @@
<span class="image main"><img src="../images/final/pcbs.jpg" alt="pcbs" /></span>
<p></p>
<span class="image main"><img src="../images/final/pcb-hero.jpg" alt="pcb-hero" /></span>
<p> <br>Here are c codes and make files:
<p> <br>Here are c codes and make files:
<br><a href="../cad files/final/sun.44.zip">sun.44.zip</a> For light sensing
<br><a href="../cad files/final/dc.44.zip">dc.44.zip</a> For DC driver
</p>
<!-- <a href="https://www.autodesk.com/products/inventor"></a> -->
<!-- <a href=""></a> -->
</section>
</div>
......
......@@ -131,6 +131,8 @@
image below.
<span class="image main"><img src="../images/week3/rfid-inkscape-4.jpg" alt="rfid inkscape drawing 4" /></span>
</p>
<h3>Freecad (3D)</h3>
<p></p>
</section>
......
......@@ -80,19 +80,22 @@
the cut. I made two The first antenna turned out bad, but the second one was rather good.</p>
<span class="image main"><img src="../images/week4/gx-24-cutting-copper.jpg"
alt="gx-24-cutting-copper" /></span>
<p>As I described in <a href="./week3.html"><em>week3</em></a> I made a small antenna inside the big one to save material, but after
<p>As I described in <a href="./week3.html"><em>week3</em></a> I made a small antenna inside the big
one to save material, but after
cutting the
material, I realized that it makes harder to get each antenna separately
I measured the inner antenna size and made a little piece of transferring tape to take it out.
</p>
<span class="image main"><img src="../images/week4/rfid-antenna-small-1.jpg"
alt="rfid-antenna-small-1" /></span>
<div style="text-align: center;"><iframe width="560" height="315" src="https://www.youtube.com/embed/bQCKo-bRkPg" frameborder="0"
allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture"
allowfullscreen></iframe></div>
<div style="text-align: center;"><iframe width="560" height="315" src="https://www.youtube.com/embed/REL7pTzSu_0" frameborder="0"
allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture"
allowfullscreen></iframe></div>
<div style="text-align: center;"><iframe width="560" height="315"
src="https://www.youtube.com/embed/bQCKo-bRkPg" frameborder="0"
allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture"
allowfullscreen></iframe></div>
<div style="text-align: center;"><iframe width="560" height="315"
src="https://www.youtube.com/embed/REL7pTzSu_0" frameborder="0"
allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture"
allowfullscreen></iframe></div>
<p></p>
<hr class="major" />
......@@ -102,7 +105,8 @@
<p>Our lasercutter is Epilog Mini 24 (40W CO2 laser with 24" x 12" engraving area).
The first thing we did together with <a
href="http://fabacademy.org/2019/labs/dilijan/students/miqayel-aramyan/"><em>Miqael
Aramyan</em></a> we took the manual and took our time to carefully read it. The section 1
Aramyan</em></a> we took the manual and took our time to carefully read it. The section
1
is about Safety that
consists of <b>Laser Safety, Electrical Safety, Fire Safety</b>.
<br>In Laser Safety section we learned that this
......@@ -144,7 +148,7 @@
is broken. So we Set the focus manually with the Red Dot Pointer. And the cuts immediately
became sharp and nice.</p>
<span class="image main"><img src="../images/week4/test-cuts.jpg" alt="test-cuts" /></span>
<p>We used <a href="https://www.freecadweb.org"><em>Freecad</em></a> to make the tolerance test
<p>I used <a href="https://www.freecadweb.org"><em>Freecad</em></a> to make the tolerance test
comb. To be honest it was not that
easy the constraints were conflicting all the time. Here are the steps to create parametric
design using Freecad.</p>
......@@ -164,18 +168,46 @@
</p>
<span class="image main"><img src="../images/week4/freecad-parametric-comb-2.jpg"
alt="freecad-parametric-comb-2" /></span>
<p>After measuring the media thickness we did the final cut.</p>
<p>After measuring the media thickness I did the final cut.</p>
<span class="image main"><img src="../images/week4/tolerance-test.jpg"
alt="tolerance-test" /></span>
<p>We made two different ones one from <b>4mm-4.9mm</b>, and one from <b>3mm-3.9mm</b> with step of
alt="tolerance-test" /></span>
<p>I made two different ones one from <b>4mm-4.9mm</b>, and one from <b>3mm-3.9mm</b> with step of
<b>0.1mm</b>. As it turned out
the first one <b>4mm-4.9mm</b> was not necessary.</p>
<p>After </p>
the first one <b>4mm-4.9mm</b> was not necessary. And the perfect fit was at 3.8mm</p>
<p>After tolerance test I tried to make a parametric snap fit kit with freecad but after a while I
decided to use Antimony.
Then I found this wonderful video.
</p>
<div style="text-align: center;"><iframe width="853" height="480"
src="https://www.youtube.com/embed/uigjofZ_3HM" frameborder="0"
allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture"
allowfullscreen></iframe></div>
<p>As you can see it's very easy to use Antimony. Right click and select 2D>>Polygon then add
2D>>Rectangle and Triangle. The rectangle will be the joint and the triangle will make
the
joints to fit easier. Play with the parameters and you'll get very interesting shapes.</p>
<span class="image main"><img src="../images/week4/antymony-gik-1.jpg"
alt="antimony gik 1" /></span>
<span class="image main"><img src="../images/week4/antymony-gik-2.jpg"
alt="antymony-gik-2" /></span>
<p></p>
<p>Add a CSG>>Union block and connect the green dots of rectangle and triangle to union's inputs
(image above).
Then add Array>>Polar array and connect it's green input to union's green output. Connect
Poligon's
number of corners N's output to array's last input. Then add a difference block and connect
Union's and Polygon's outputs to difference's inputs.
At this point you should get a ready model.
</p>
<span class="image main"><img src="../images/week4/antymony-gik-2.jpg"
alt="antymony-gik-2" /></span>
<p>One big disagvantage of Antimony is that it only exports PNG and STL I would add SVG and OBJ too.
So I added Export PNG block and connected Difference last output to Export's input, hit export. I used Corel Draw to trace png and layout the print ready file.
</p>
<span class="image main"><img src="../images/week4/hero.jpg" alt="hero" /></span>
<p>I was satisfied with the result but I would try to learn freecad more rather than using Antimony.
<br>Here are the files:
<br><a href="../cad files/week4/gik_pentagon.sb">gik_pentagon.sb (Antimony)</a> and <a href="../cad files/week4/gik pentagon.png">gik pentagon.png</a>
<br><a href="../cad files/week4/gik_triangle.sb">gik_triangle.sb (Antimony)</a> and <a href="../cad files/week4/gik triangle.png">gik triangle.png</a>
</p>
</section>
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