Commit 822677fb authored by Nanditha Nair's avatar Nanditha Nair

Update week05.md

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......@@ -34,31 +34,25 @@ PCB is an acronym for printed circuit board also known as a printed wiring board
2. The bits used are very expensive
### Types of Milling
A. Conventional Milling (UP)
![Conventional Milling](../images/week05/conmilling.jpg)
<p> </p>
<b>A. Conventional Milling (UP)</b>
<p align="center"><img alt="Conventional Milling" height="350" width="600"src="../../images/week05/conmilling.jpg" /> </p>
1. Chip width starts from zero and increases which causes more heat to diffuse into the workpiece and produces work hardening
2. Tool rubs more at the beginning of the cut causing faster tool wear and decreases tool life
3. Chips are carried upward by the tooth and fall in front of cutter creating a marred finish and re-cutting of chips
4. Upwards forces created in horizontal milling tend to lift the workpiece, more intricate and expansive work holdings are needed to lessen the lift created
B. Climb Milling (Down)
<b>B. Climb Milling (Down)</b>
![Climb Milling](../images/week05/climbmilling.jpg)
<p align="center"><img alt="Climb Milling" height="350" width="600"src="../../images/week05/climbmilling.jpg" /> </p>
1. Chip width starts from maximum and decreases so heat generated will more likely transfer to the chip
2. Creates cleaner shear plane which causes the tool to rub less and increases tool life
3. Chips are removed behind the cutter which reduces the chance of recutting
4. Downwards forces in horizontal milling is created that helps hold the workpiece down, less complex work holdings are need when coupled with these forces
5. Horizontal milling is when the centerline of the tool is parallel to the work piece
## Roland Modela MDX-20 - Machine used in our lab for PCB Milling
<p><img alt="Roland Modela MDX 20 Tryout" height="350" width="600"src="../../images/week05/roland.jpg" /> </p>
<p align="center"><img alt="Roland Modela MDX 20 Tryout" height="350" width="600"src="../../images/week05/roland.jpg" /> </p>
### PCB Materials used in our lab
......@@ -68,7 +62,6 @@ It is a hard, flat material that consists of a thin layer of copper glued over a
FR 4 - is a glass fiber epoxy laminate - Used for chemical etching. FR4 uses 8 layers of glass fiber material.
### Parameters
1. Cutting surface : The surface of the solid object to be cut
2. Size : The size of the finished object
3. Depth : The depth of cutting
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