Commit 8f10377d authored by Nanditha Nair's avatar Nanditha Nair

Update week06.md

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......@@ -19,14 +19,14 @@ Fused Deposition Modeling (FDM), or Fused Filament Fabrication (FFF), is an addi
FDM is the most widely used 3D Printing technology. At Superfablab, Kochi we use Ultimaker 2+, an FDM printer.
#### How FDM Works?
<p><img alt="FDM Printer" src="../../images/week06/fdm.png" /> </p>
<p align="center"><img alt="FDM Printer" src="../../images/week06/fdm.png" /> </p>
<p><b> Step 1. </b> The filament used for printing comes as a spool and it is loaded into the printer. The filament will be a thermoplastic, ie a plastic polymer material that can be moldable at an increased temperature and solidifies when cooled. When the nozzle of the printer reaches the desired temperature, the filament is fed to the extrusion head and into the nozzle and it starts to melt.</p>
<p> <b> Step 2. </b> The extrusion head is attached to a 3-axis system that allows it to move in the X, Y and Z directions. The melted material is extruded out of the nozzle in thin strands and is deposited layer-by-layer in the locations already fed to the machine, where it cools and solidifies. The cooling of the material can be accelerated through the use of cooling fans attached on the extrusion head.</p>
<p> <b> Step 3. </b> Multiple passes are required to fill an area. When one layer is finished, the platform on which the build is happening will move down (or in some other machines, the extrusion head moves up) and a new layer is deposited. This process is repeated until the part is complete.</p>
### Ultimaker 2+ Parameters
<p><img alt="Ultimaker Image" src="../../images/week06/ultimaker.jpg" /> </p>
<p><img alt="Ultimaker Illustration" src="../../images/week06/ulti.jpg" /> </p>
<p align="center"><img alt="Ultimaker Image" src="../../images/week06/ultimaker.jpg" /> </p>
<p align="center"><img alt="Ultimaker Illustration" src="../../images/week06/ulti.jpg" /> </p>
<p><b> Build volume</b> of Ultimaker 2+ is up to 223 x 223 x 305 mm (8.8 x 8.8 x 12 inches); Large build volume, yet fit any desk. </p>
<p> <b>Nozzle sizes</b> of 0.25, 0.4, 0.6 and 0.8 are available and one can switch betwen these. The standard is 0.4 mm but the option for 0.25 mm for detailed print and 0.8 mm for fast prints are also available. Calibrating the build plate level height is easy with the automatic adjustment. </p>
<p> <b> Nozzle Temperature</b> is maintained at 210 degree celsius. 35 watt heater cartridge that heats the nozzle in under a minute and allows for fast prints.</p>
......@@ -54,18 +54,18 @@ FDM is the most widely used 3D Printing technology. At Superfablab, Kochi we use
<p> <b>Infill Geometry: </b></P>
1. <b> Rectangular</b>: The most common fill but it really has no real benefit over some of the others. It is simple and often a default in printing software.
<p><img alt="Rectangular Infill" src="../../images/week06/rectangle.png" /> </p>
<p align="center"><img alt="Rectangular Infill" src="../../images/week06/rectangle.png" /> </p>
2. <b> Wiggle</b>: Only for a part that can twist and needs a little bit of flexibility to it. This shape offers the least amount of rigidity and is otherwise useless.
<p><img alt="Wiggle Infill" src="../../images/week06/wiggle.png" /> </p>
<p align="center"><img alt="Wiggle Infill" src="../../images/week06/wiggle.png" /> </p>
3. <b> Triangular</b>: This shape offers great strength and high lateral loads, therefore very useful. This is good for increased wall strength or longer slender structures like bridges and roof trusses.
<p><img alt="Triangular Infill" src="../../images/week06/triangle.png" /> </p>
<p align="center"><img alt="Triangular Infill" src="../../images/week06/triangle.png" /> </p>
4. <b> Hexagon aka the honeycomb</b>: This provides the best infill for strength vs material used. This shape is the most efficient infill and fastest to print, the goto infill for most things. It saves material, time, energy and offers high strength. This is infact a good example of bio-mimicing. This is why the honey bees home is formed of hexagons. Wax is very costly to make and economically bee’s just want to make tubes with as little wax as possible to house larva, honey and what-not. Nature takes advantage of this all over the place, it’s both efficient, elegant and mathematically beautiful. This naturally occurring phenomenon is really just circles pressed together to form a tessellation. Honey bee’s are not aware of what they are building and are really only trying to form tubes that their bodies can fit into. As they build more and more of these tubes in a closed space they press together and form hexagons. It's the only outcome or shape that could occur from this which is why it is all over the place in nature.
<p><img alt="Honeycomb Infill" src="../../images/week06/honeycomb.png" /> </p>
<p align="center"><img alt="Honeycomb Infill" src="../../images/week06/honeycomb.png" /> </p>
## Group Assignment
<p><img alt="Thingverse" src="../../images/week06/thingverse.jpg" /> </p>
<p align="center"><img alt="Thingverse" src="../../images/week06/thingverse.jpg" /> </p>
<p>We tested using the file “Test your 3D printer! v3” by ctrlV on Thingiverse.
We used Cura to set up the print file and generate a gcode that can be used in the 3D-printer. We could only manage the 0.4mm nozzle in ultimaker 2+. </p>
......@@ -77,7 +77,7 @@ Material: PLA
Profile:
Infill:
Cura is an open source 3D printer slicing application.
<p><img alt="Thingverse Output" src="../../images/week06/groupoutput.jpg" /> </p>
<p align="center"><img alt="Thingverse Output" src="../../images/week06/groupoutput.jpg" /> </p>
......@@ -85,7 +85,7 @@ Cura is an open source 3D printer slicing application.
## Individual Assignment
### Additive vs Subtractive Manufacturing
<p><img alt=" Subtractive and Additive Process" src="../../images/week06/addsub.jpg" /> </p>
<p align="center"><img alt=" Subtractive and Additive Process" src="../../images/week06/addsub.jpg" /> </p>
<p> <b> Subtractive Process</b></p>
<p>Subtractive manufacturing process involves removing sections of a material by machining or cutting it away. Creating a Sculpture from wood is Subtractive Process.</p>
<p> <b> Additive Process</b></p>
......@@ -93,15 +93,15 @@ Cura is an open source 3D printer slicing application.
### Heart Pendant
I initially designed a dovetail joint, but as it turns out there are machines that can create this "impossible" joint.
So I made a heart shaped pendant and test printed in a bigger scale.
<p><img alt="Heart Pendant" src="../../images/week06/col1.jpg" /> </p>
<p align="center"><img alt="Heart Pendant" src="../../images/week06/col1.jpg" /> </p>
<p> <b>Image 1: </b> Under Sketch menu=> Create Sketch, I chose a plane. </p>
<p>Select line tool, start it at the origin. Click my mouse up, and click again to stop the line. Press escape. </p>
<p>I pressed D and dimensioned the line to 27mm. </p>
<p>I clicked the spline tool and started from one end of the line by clicking once. I clicked several times on the way to add control points and ended on the top of the line and clicked on the hand to finish the spline. The tangents in the control points on the path can be adjusted to get a nice smooth curve that looks like half a 2D heart. </p>
<p><img alt="Heart Pendant" src="../../images/week06/col2.jpg" /> </p>
<p><img alt="3D Printed Heart Pendant" src="../../images/week06/heartpendant.jpg" /> </p>
<p align="center"><img alt="Heart Pendant" src="../../images/week06/col2.jpg" /> </p>
<p align="center"><img alt="3D Printed Heart Pendant" src="../../images/week06/heartpendant.jpg" /> </p>
for my file click [here](https://drive.google.com/open?id=1ZZgDTdLybOi79mcRLuG4yxCCU-1Z_5Uo)
## 3D scan a body and print it
......@@ -111,7 +111,7 @@ So our instructors told us to do the scanning after two weeks when Leo reaches i
## Discarded Individual Assignment
Dovetail Joint
<p><img alt="dovetail joint" src="../../images/week06/dovetail.jpg" /> </p>
<p align="center"><img alt="dovetail joint" src="../../images/week06/dovetail.jpg" /> </p>
For my file click [here](https://drive.google.com/drive/folders/1cf4zxX9ugVXbB6yCF6nAH8hMuDOIOPX7?usp=sharing).
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