Commit bc4baaf7 authored by Arash Sattari's avatar Arash Sattari

w7-dogbone

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<div class="img-container"><img style="width: 800px;" src="../img/assignments/w7/i17.jpg" alt=""><br><br> <b>Figure 25. </b>Setting the Spindle speed and Feedrate.</div>
<div class="img-container"><img style="width: 800px;" src="../img/assignments/w7/i18.jpg" alt=""><br> <b>Figure 26. </b>Milling process.</div>
<div class="img-container"><img style="width: 500px;" src="../img/assignments/w7/i19.jpg" alt=""><br> <b>Figure 27. </b>Cutting the tabs.</div>
<div class="img-container"><img style="width: 800px;" src="../img/assignments/w7/i20.jpg" alt=""><br><br> <b>Figure 28. </b>Final result.</div>
<p>
A rounded CNC bit cannot reach all the way into an inside angle (figure 28-1), which causes problems in most of the joinery types. One common approach to fix
the problem is using dog-bone. Figure 28-2,3 shows two types of dog-bones that can be used for press-fit joints.
</p>
<div class="img-container"><img style="width: 800px;" src="../img/assignments/w7/28.jpg" alt=""><br><br> <b>Figure 28. </b>Dog-bones.</div>
<p>
The drawback of using dog-bones is that they create unwanted holes at the joints. To prevent these holes, I did not use dog-bones,
instead filed the inside angles of the joints to make them 90 degree. Then with a little hammering I could fit pieces together. Figure 29 show the assembled elephant rocker.
</p>
<div class="img-container"><img style="width: 800px;" src="../img/assignments/w7/i20.jpg" alt=""><br><br> <b>Figure 29. </b>Final result.</div>
<p>
As mentioned, I did not add dog-bones to my design, but the process is simple in Fusion 360. <a href="https://www.youtube.com/watch?v=EM13Dz4Mqnc"><b>Here</b></a> is a YouTube tutorial video, that
escribes how to make dog-bones in Fusion 360. There is an add-in for Fusion 360, created by Casey Roger,
that allows adding dog-bones to the design in an automated way. Here is a summary of the steps that should be followed:
</p>
<p style="padding-left:30px;">
1- <a href="https://github.com/tapnair/Dogbone"><b>Download</b></a> the add-in. <br>
2- Unzip it and drop it in <span class="inText">%AppData%\ Autodesk\Autodesk Fusion 360\API\AddIns</span> . <br>
3- When you start Fusion 360, it should be already added there (figure 30). If not, you can add it manually from ADD-INS menu <img src="../img/assignments/w7/icon3.jpg" alt="">. <br>
</p>
<div class="img-container"><img style="width: 350px;" src="../img/assignments/w7/30.jpg" alt=""><br> <b>Figure 30. </b>Dogbone add-in in Fusion 360.</div>
<p style="padding-left:30px;">
4- Select the Dogbone and press the Run button (or double click). It will add an extra icon to the Fusion’s toolbar (figure 31). <br>
</p>
<div class="img-container"><img style="width: 400px;" src="../img/assignments/w7/31.jpg" alt=""><br> <b>Figure 31. </b>Dogbone icon in toolbar.</div>
<p style="padding-left:30px;">
5- Select the edge ( or edges) you want to create the dog-bone on. Next, click on <img style="width: 24px;" src="../img/assignments/w7/icon4.jpg" alt=""> and set the tool diameter according to the mill bit (figure 32)
that you are going to use. Then click <b>OK</b>.
<div class="img-container"><img style="width: 900px;" src="../img/assignments/w7/32.jpg" alt=""><br> <b>Figure 32. </b>Making dog-bones at edges.</div>
</p>
</div>
</div>
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