8. Computer-controlled machining¶
This week I worked on building something big on a wood CNC, I need a desk for my house so that’s what I will be building.
wood furniture always fascinates me, I follow a few youtube woodworkers on youtube to see how furniture are built.
Here is the design, I made sure it is fully parametric and doesn’t break down if I change its size.
Here is the side view.
Here is the back of the desk.
Here I’m showing the desk stretchers and how they connect to the legs, since the legs are 3 layers of plywood, I made the stretchers to have a part going inside the middle leg layer.
The part in the middle should hold the desktop, I connected the tabletop with this part with screws to have a clean top and no joints.
Here are the front legs, showcasing the middle layer which holds the stretchers.
Here are the back legs, showcasing the middle layer which holds the stretchers.
Fusion 360 live veiw¶
here is a link of my design
I started by cutting a laser-cut model to make sure that the joints I designed work, and they do.
Here are some pictures of the model.
I started by testing the CNC kerf by cutting a simple snap-fit joint till git a snug but not too tight fit, tested the fit on 18mm plywood which I am planning to use for the desk.
Design value = 17.5mm, measured value = 16.7mm.
Design value = 18mm, measured value = 17.13mm.
Design value = 20mm, measured value = 19.3mm.
after these tests, I modified the material thickness parameter to 19.5 to get the fit I want.
I used screws on the sides of the board to fix it to the sacrificial one.
I used Vcarve pro software to make the toolpath, after exporting the sketchs from fusion 360, I ordered them in autoCad.
After setting up the 2D vector design, I went to the cnc cam software Vcarve to make the machine code. first step is to set the stock size, I used a 2400mm X 1200mm X 18mm plywood sheet.
after that I imported the design and arranged the pieces in the sheet.
then from the top right, pick the cutting tool needed, in my case all on my part needed to cut, no pockets, I set the tabs locations and the milling bit type.
and finally, simulate the tool path and make sure that everything went well.
for another CNC project check my wild card assignment where I used the CNC to create a Male mold for vacuum forming
cut and assemble¶
And, here are the parts after CNC machining. machining video
I started by gluing the 3 layers of each leg together.
After they had dried I tested the fit of the stretcher’s joints and they fit well, they need light hammering in though.
After I made sure that the joints are well, I started with a test assemble, first by connecting the side stretcher to the front and back legs as shown below.
After doing that for the two sides, I connected them with the front, back, and middle stretchers.
Then placed the tabletop on it and here how it looks.
Now I made sure everything fits well, I disassembled it, sanded it for way too long to get a smooth finish especially on the legs, then spray paint it with lacquer.
Here is the desk ready for use in my new house.
All files can be downloaded from here