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The first step in creating the model is to sketch the outline of the knife.
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Since I'm waiting for some materials to get in, I thought I'd spend my down time walking through modelling a part and then creating associated tool paths.
The part is a chisel ground kitchen knife with a skeletonized handle. Chisel grind means it can be done in a single setup. Going with a skeletonized handle makes it pretty usable without making handle slabs.
I am self-taught and inexperienced, so feel free to point out opportunities to improve the design and process.
Here's a render of the part.
Last edited by Gabe Newell; 02-06-2011 at 01:28 AM. Reason: Made title more descriptive
The first step in creating the model is to sketch the outline of the knife.
In this case, I'm lazy, so I'm using precision ground stock (.25 x 3" by 18").
The sketch is then extruded .25".
Next, you create a reference plane parallel to the right plane. We'll use this plane to create an outline we'll use to cut the bevel of the blade.
Next I create a contour on the plane with which I will carve the extruded sketch.
In order to create a swept cut, you need to have a path which intersects with the contour. So I create that.
This gives me a primary bevel.
Now I use the linear pattern command to skeletonize the handle.
The holes in the handle can be used to hold the part down, but I add a tab at the other end as well. The tab can be ground off on a belt grinder.
The stock is 3" by .25 by 18". There are four holes I'll drill to hold it down for machining.
Previously I've created models for the fixture I use. It's an aluminum plate secured to my mill's table:
The plate, t-bolts, a clamp, mitee bites, work piece and part look like this:
Next, drill pilot holes and tap the holes in the aluminum base plate I'm using for a fixture.
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The tapping operation looks the same, so I've omitted it.
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