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Commit a9ddddbb authored by Jorge Valerio Araoz's avatar Jorge Valerio Araoz
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Updating web page

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......@@ -202,9 +202,8 @@
This is the 4 hour printing test from <a href="https://jjrobots.com/sphere-o-bot-assembly-and-user-guide/"><b>Sphere-O-Bot</b></a>.
We look for other possibilities, and base on <a href="https://shop.evilmadscientist.com/productsmenu/768"><b>The EggBot Pro</b></a>,
a commercial device that uses a solid aluminium main frame we notice the advantages of using commercial brackets for the NEMA 17 stepper motors.
This selection generate a design improvement.<br><br>
<img src="assets/img/group_01/Imagen12.jpg" class="img-fluid" alt=""><br><br>
This selection generate a design improvement.<br>
The use of NEMA 17 stepper motors brackets generated the following design improvement:<br>
<ol>
<li>Y Axis Arm: We redesigned the mounting hole to the stepper motor. Fig (a) shows the original dimension that it was suppose
......@@ -212,7 +211,7 @@
This because the stepper motor shaft did not have a notch that could provide a better adjustment.
Thus, we change the mounting hole diameter (Fig b), in order to use a commercial Shaft Coupling (5-8mmx20mm).
This product provides fixation holes that allows to fasten the shaft and the axis arm with set screws.</li><br>
<img src="assets/img/group_01/Imagen13.jpg" class="img-fluid" alt=""><br><br>
<img src="assets/img/group_01/Imagen12.jpg" class="img-fluid" alt=""><br><br>
<li>Changes within the original main frame (fig a):</li>
<ol type="a">
......@@ -222,11 +221,11 @@
geometry to a shelled model (fig c).</li>
<li>We decide also to change the regular flat top surface to a 60° angled surface. This was to avoid the
of supports.</li><br>
<img src="assets/img/group_01/Imagen14.jpg" class="img-fluid" alt=""><br><br>
<img src="assets/img/group_01/Imagen13.jpg" class="img-fluid" alt=""><br><br>
</ol>
<li>NEMA 17’s brackets mounting holes: We tested with different rows quantities with 2 (fig a) and 3 (fig b). However,
this kind of adjustment is complex for assembling. Thus, the final design (fig c) changed to slots.</li><br>
<img src="assets/img/group_01/Imagen15.jpg" class="img-fluid" alt=""><br><br>
<img src="assets/img/group_01/Imagen14.jpg" class="img-fluid" alt=""><br><br>
</ol><br>
<b>The final Mechanical design</b><br>
......@@ -234,11 +233,16 @@
mechanical parts:<br>
<ol>
<li>X Axis press and turn mechanism: This allows gourd adjustment. The design bring the possibility to increase gourd
sizes from 8 to 10 cm. Also includes a 608 bearing, that facilitates rotation.</li>
sizes from 8 to 10 cm. Also includes a 608 bearing, that facilitates rotation.</li><br>
<img src="assets/img/group_01/Imagen15.jpg" class="img-fluid" alt=""><br><br>
<li>X Axis Actuator: This render shows assembles of the bracket to the main frame and the stepper motor to the bracket.
Also how the shaft coupling is adjusted and the inclusion of a holder-top. This final part receive the EVA circular sticky
pads, that would sustain the gourd.</li>
<li>Y-Z Axes: This render shows assembles of the drawing arm.</li>
pads, that would sustain the gourd.</li><br>
<img src="assets/img/group_01/Imagen16.jpg" class="img-fluid" alt=""><br><br>
<li>Y-Z Axes: This render shows assembles of the drawing arm.</li><br>
<img src="assets/img/group_01/Imagen17.jpg" class="img-fluid" alt=""><br><br>
</ol><br>
<b>The Electronic Assembly</b><br><br>
......@@ -253,7 +257,8 @@
<li>Additionally, we followed <a href="https://hackaday.com/2019/04/17/what-can-you-learn-from-an-eggbot/"><b>Elliot
Williams </b></a> hacking solution to control a servomotor for Z Axis function. Thus, we use Z+ Axis -End Stop pin (fig b)
to connect it, this would also need a hacking process for the GRBL stored in the Arduino One.
</li>
</li><br>
<img src="assets/img/group_01/Imagen18.jpg" class="img-fluid" alt=""><br><br>
</ol><br>
<b>Programming Set-Up </b><br><br>
......@@ -269,11 +274,13 @@
<li>Open the Arduino IDE.</li>
<li>Open the GRBL by going to File option in the general menu, then select examples.
A drop menu will be available and we have to select grbl and grblUpload (fig b).</li>
<li>Upload the grbl to Arduino IDE by pressing run option.</li>
<li>Upload the grbl to Arduino IDE by pressing run option.</li><br>
<img src="assets/img/group_01/Imagen19.jpg" class="img-fluid" alt=""><br><br>
<li>Then we need to test that the GRBL is running. So we need to open the Arduino serial monitor.</li>
<li>Then we need to select 115200 Bauds (Fig a) and select “New Line” option (Fig b).</li>
<li>You can test if everything runs ok by sending a $$ command.</li>
<li>Then you will get the machine parameters.</li>
<li>Then you will get the machine parameters.</li><br>
<img src="assets/img/group_01/Imagen20.jpg" class="img-fluid" alt=""><br><br>
</ol>
</li>
<li>Inkscape for G-Code Generation. Like suggested by
......@@ -286,24 +293,29 @@
the drawing. We stablish a 270x40mm area.</li>
<li>Then, we set the 270x40mm area into a new document properties.</li>
<li>Then you need to generate the drawing, you can use part or the total working area. The figure bellow shows
the process.</li>
the process.</li><br>
<img src="assets/img/group_01/Imagen21.jpg" class="img-fluid" alt=""><br><br>
<li>We used Gcodetools extension within Inkscape to generate de G-Code. For this process you need to:</li>
<ul>
<li>From the Gcodetools Menu select the option “Tools library” (fig a)</li>
<li>Then a option window will open</li>
<li>Here you need to select the kind of tool type, in our case we select cylinder (Fig b).</li>
<li>Here you need to select the kind of tool type, in our case we select cylinder (Fig b).</li><br>
<img src="assets/img/group_01/Imagen22.jpg" class="img-fluid" alt=""><br><br>
<li>This process brings you the tool features (a green box will appear in your screen). Here it is
recommendable to change the feed feature (it will appear with 400) to accelerate the three axes movements.</li>
recommendable to change the feed feature (it will appear with 400) to accelerate the three axes movements.</li><br>
<img src="assets/img/group_01/Imagen23.jpg" class="img-fluid" alt=""><br><br>
<li>Then we need to set orientation points (XY coordinates origin). Select extensions > Gcodetools>Orientation Points.</li>
<li>A new option window will open, and you only need to click apply (maintain default option) (Fig a).</li>
<li>The orientation coordinates will appear in the bottom left point of origin (Fig b).</li>
<li>The orientation coordinates will appear in the bottom left point of origin (Fig b).</li><br>
<img src="assets/img/group_01/Imagen24.jpg" class="img-fluid" alt=""><br><br>
<li>You need to ensure that your images are grouped and that you turn them into vectors.</li>
<li>Then to generate the GCode first we select the images then, go to extentions>Gcodetools>Path to Gcode</li>
<li>A new option window will open (Fig a) < select preferences and here we must change Z safe height
option (height that will achieve Z axis tool to change position). By default, appears 5mm, we must increase
this number being sure that it needs to be a positive number. You have to acknowledge that this number will
affect drawing time. So we set it up to 1mm (Fig b).</li>
<li>In preferences option you have also to select the folder to storage Gcode files</li>
<li>In preferences option you have also to select the folder to storage Gcode files</li><br>
<img src="assets/img/group_01/Imagen25.jpg" class="img-fluid" alt=""><br><br>
<li>Then you need to return to Path to Gcode option and click apply.</li>
<li>A .ngc extension file will be created.</li>
</ul>
......@@ -316,7 +328,8 @@
In our case use the last one because it runs without installation.
Download the files and go to bin execute ugsplatform64.exe </li>
<li>The UGS program will open and to set up the connection we need to select 115200 Bauds, port, and firmware
(those options are located down the main menu).</li>
(those options are located down the main menu).</li><br>
<img src="assets/img/group_01/Imagen26.jpg" class="img-fluid" alt=""><br><br>
<li>Then we need press the Connect or Disconnect button.</li>
<li>We need to configure the GRBL parameters. Thus, send $$ command.</li>
<li>With that command the program will echo a list of parameters. Between those, we need to focus on the ones
......@@ -330,15 +343,16 @@
<li>$111: Y Axis Maximum Rate: 20,000 mm/min (we test different velocities and set it more efficiently).</li>
<li>$120: X Axis acceleration – 1000 mm/sec2.</li>
<li>S121: Y Axis acceleration – 1000 mm/sec2.</li>
</ul>
</ul><br>
<img src="assets/img/group_01/Imagen27.jpg" class="img-fluid" alt=""><br><br>
</li>
<li>Then open the .ngc extension file created previously.</li>
<li>Then click play button. The CNC will start drawing, like shown down below.</li>
<li>Then click play button. The CNC will start drawing, like shown down below.</li><br>
<img src="assets/img/group_01/Imagen28.jpg" class="img-fluid" alt=""><br><br>
</ol>
</ol><br>
</p>
<h3><b>FILES</b></h3>
<p>
......
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