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For twenty plus years, my boss has had this piece of live edge Myrtlewood sitting in his garage hoping one day to carve a design in it that would represent its character and beauty. Having a really nice friend give me a one year membership to the TechShop allowed me the opportunity to use my knowledge of SolidWorks in combination with PartWorks (the software that that writes code to control the ShopBot) to create this beautiful piece. The tree design itself was drawn by my boss. My love for detail and the beauty that objects behold gave me the idea to use the ShopBot to carve the tree design into the wood. The challenge that presented itself was whether or not I could get the Shopbot to carve the tree design where intended it to emerge/sprout from the piece itself.

Step 1: Materials

Materials:
1 - section of wood (in this case I used a piece of myrtlewood)
1 - scrap piece of MDF or wood that is about the same size as your project piece of wood
a couple pieces of sketching paper
a couple scrap peices of wood for anchoring to Shopbot

Tools:
tape measure
safety glasses
sand paper or sanding block
handfull of screws (approx. 1" to 1 1/2")
1 - Flat bottom bit (recommend a 1/4" up-cut bit)
1 - V-carve bit (used a 90 degree bit)
1 - Shopbot

Software:
PartWorks
Solidworks (optional)

Step 2: The Design - Getting the Idea Down on Paper

First you want to come up with a basic idea and sketch out a few of those ideas on whatever you've got lying around. In this case, we wanted a tree and a cross to be carved into the wood. Once you have a basic design in mind, tape together enough paper to cover the entire surface of the wood, flip the wood over on top of the paper, trace out the shape of the wood. I decided to cut out the shape (I think doing that really helps later on in the planning and cutting process). 

Next up, start drawing the design on paper, this doesn't have to be a perfect drawing it just has to be close to what you have in mind. Again, you will clean up the image in the next step, so don't worry to much about neatness at this point. Note: try to keep your design from coming to close to the edge of the wood that way you give yourself a little wiggle room. Also I should encourage you to draw three small circles at random places on your drawing, this will help you align your piece of wood on the Shopbot later.


Step 3: Perparing for Partworks- Part 1

Now that you have your initial design drawn to scale, its time to move on to transferring your drawing to something digital. This is not a tricky step, but it can be tedious and long if your design is very intricate (this design was; it took about 8 hours of tracing in SolidWorks to complete).

The first thing I suggest is laying your drawing down flat on the floor. You will want to place something in the picture that you know the absolute size of (like a quarter or small measuring tape), preferably in a blank spot on the drawing so that you don't cover any part of the design. This is so you'll have something to reference in size and scale the picture appropriately. Using a digital camera take a picture of the design with the scale object in place. Make sure to take the picture from as straight above as possible so there is no skew to the image. You could also use a scanner here if your drawing is small enough to fit in one or if you feel like compiling the images together in a composite, using a program such as Photoshop. 

Step 4: Preparing for Partworks - Part 2

***It is optional that you do this step in SolidWorks, you can skip using an additional program and do everything in Partworks***
If you are like me and you have used any CAD drawing/modeling programs then you might think PartWorks is a little basic. So this step will just explain how to import an image into SolidWorks, size it appropriately, and then export the drawing into something PartWorks recognizes.

So lets first open a new file in SolidWorks. Next go under your options and make sure that you have the right type of units that you want to use (i.e., inches or mm). Now create a sketch on one of the three major planes (i.e., front, top, right). Now to insert a picture into SolidWorks, go to Tools>Sketch Tools>Sketch Picture... browse to find the image of your drawing, then click open. Once the picture loads, click the check mark and then you are ready to begin determining your scaling factor.

To find this scaling factor you first need to draw a line over whatever you placed in the picture for a reference. In most cases, the item you used for your reference will not be straight up and down, so when you go to Smart Dimension, make sure you move your mouse around until you get the perpendicular dimension (example in pictures, I made my line from one inch mark to another). Since I used a measuring tape it was simple; whatever the Smart Dimension came to be, 1 divided by the Smart Dimension measurement gives you the scaling factor. If you use something else its simple: 

(The actual length of the object) / (Smart Dimension measurement) = Scaling Factor

Now that you have that, double click on the image. You should see a vertical and horizontal length of the actual image (these should be automatically linked). To scale it, all you need to do is multiply your scaling factor by one of these lengths and type this result into the appropriate box. (example in picture below)

After having scaled the picture, its time to start tracing. If you're going to have a lot of spiraling curves, I recommend playing with the spline tool. Just remember that all shapes have to be closed (meaning no gaps can be left in-between end point of lines).  Remember to trace out those circles you put in your drawing.

Once you're done tracing out your entire drawing, you can move on to extruding the drawing. Now when I got to this step I knew I wanted to have multiple layers of cutting in my final piece so I extruded my main layer in one thickness and what I called the new growth buds on the end of each branch in another thickness. By doing the various thicknesses you create more fine detail that can be in the final carving.

Now that you have finished all of the extrusions, click on all the surfaces (by holding shift or control) that you would like to bring into Partworks (I only clicked on the top surfaces). To export this data go to file Save As, then go the pull down menu and select .dxf format.

Step 5: Partworks

Now if you did a CAD step before this, PartWorks will be a bit easier, if not you will just have to do the tracing and scaling steps at this time.

So, moving on as if you have done the CAD step previously, you will need to start a new PartWorks file. Make the material size a little larger than the actual wood size. To import the .dxf data there is a simple button to the side of the screen. (Refer to the chart below)

Now that you have your art in PartWorks you need to clean it up a bit. You may have multiples of the same line, this usually happens when making .dxf files from multiple thickness parts in SolidWorks, but trust me when I say its easier to bring in all the details of your drawing at once. All of your lines will need to be joined together to make closed loops, that way the V-carve tool paths will work.  If you are going to have different cut depths, I suggest you divide up your various designs on different levels.

If I haven't reminded you enough of the circles you should have had in your drawing, I'm reminding you again. Use the button in the second row under Flie Operations that I have indicated in the chart below to change the origin to the center on one of these circles. If you are not sure of the exact location of the circle, use the move control button under Edit Vectors and set the command to tell you the absolute location.

The last thing you will need to do in PartWorks is set your tool paths. I recommend the V-carve tool path for all artistic drawings, the bit will cut all the space inside of the drawings without going outside the lines. It's a great tool! Remember to save all tool paths to a file type that the ShopBot recognizes, using the simple button indicated in one of the charts below.

Step 6: Now for the ShopBot

I suggest making a test cut in something that's not one of a kind such as MDF, its cheap and you cut it much faster than most other materials. Plus after your finish you can polyurethane it, sand it, and you've got another piece of art for your wall. Now, take your test cut out and place it on top of your piece of wood making sure it fits within the boarders.

Once you are satisfied with your cuts and you feel you're ready, take your pieces of wood and place it upon the Shopbot cutting deck. Place your original drawing on top of your piece of wood carefully aligning it to match the surface. Align the drill bit over the circle on the drawing that was set to the origin of the PartWorks file and set the origin of the Shopbot (the command should be z2). You should now place one of the anchors near the bottom of the wood you are cutting, this will lock in the X position of your origin (this is how this Shopbot was set up). 

Next up go into PartWorks, find one of the other circles that is not at the origin. Click on it and then click on the move command, you have a choice of relative or absolute movement, you want absolute. This will give you the location of the circle in comparison to the origin. You can now tell the ShopBot to move to that location by using the command "mx" then typing in the x distance and then the command "my" and then the y distance. Now you can adjust the wood on the table until that circle lines up under the drill bit, then repeat the same move commands for the last circle. This should align everything so that when the ShopBot starts cutting everything will be where you intended it to be. Make sure that you anchor the wood down tightly.

I would suggest that you run a planing tool path with a flat bottom bit as your first cut, I took off about .025" but my piece of wood was fairly flat. All I can say from here is make sure that you zero your bit every time you change it (the command should be c2) and suggest that you run you flat bottom cuts first. I feel that in the long run it is better on the tips of your V-carve bits.

***Note: While you are cutting you want chips to be flying not dust (dust means you are wearing out your bit faster). This can be regulated  by the feed rate of the bit and the RPM's of the bit.

Step 7: Finishing

Now you can do whatever you want to finish it. For now all I am doing is sanding a few ruff edges because I eventually plan to do the backside. You may wish to paint the entire carving, accent paint areas, or just stain it.  
WOW! This is really nice!!! <br>
Amazing. That is very unique.
Yes, you are totally AWESOME!<br><br>What a unique piece of art you have created. I know how much work and time you put into turning this huge slab of wood into a stunning sculpture. It is in fact a lot larger then it appears in pictures.<br><br>I am proud to say, I was there when this baby was born. It is amazing, that a tree can continue to bring so much joy, even after it is gone.<br><br>What a great job, well done - absolutely fabulous!<br><br><br>
Thanks so much, I had so much fun making this and I have to thank everyone at the techshop for their support.
Really nice piece. Personally I think you did a great great job balancing the organic feel of the drawing and the precision of the machine. The design fits the material well. All in all a very nice project. Well documented too!
Thanks I really tried to keep track of everything I did, especially with the programs because there is nothing worse than trying to hunt down a command.
it's a beautiful carving but like anything machine made it has no life, no soul, that is something only the artist can impart with the minor imperfections carving by hand (even with a power grinder or dremel) invariably create.
Well, in that case I'll 1up you and claim that carving with any kind of tool is soulless and only an artist who scratches and gnaws with teeth and claw makes true living art. Also I make the claim that any painter using any medium other than blood on cavewall is a pretentious neofyte.<br>FFS when are elitists gonna stop claiming people who use different tools than they are create lifeless/soulless art? If I had a penny for every stupid introverted peice of overpriced garbage I had to endure in a public park just because someone managed to sell their latest watery bronze abortion to the city .. GAAAAWD!
hmm i think there is an argument on both sides......If i laser scanned my macho physique then 3D printed the result would it be held in the same regard as Michaelangelo's David? but with that said some hand made so-called art is complete fart......so i guess art is subjective.... personal opinion and taste are two things that make art what it is.
+10 <br>
Sure it has soul, it has the soul that the artist put into it as well as what the person that programmed the cnc put into it as well. I personally love hand carved things as well, but this is a very nice piece and has a life of it's own.
I knew this would be a controversial comment. It is a gorgeous piece like I said and the original art has a lot of thought and time in it. It may just be sour grapes on my part that a piece I would spend days or weeks on with knives and hand chisels or even with a dremel type grinder can be created by just typing some commands into a machine that will then reproduce the piece identically as many times as you want. To my mind it's like buying a print of a piece of art, yes it's still a fantastic work of art but the artists soul isn't there, you can't feel his brush strokes when you run your hand over the piece. Although the original idea is from a living, breathing person and they may have even typed the commands into the machine, in the end it was a soulless machine that created the finished piece and can reproduce it endlessly 24 hrs a day.<br> <br> I know I am in a minority, that point was driven home at an art festival in Miami Florida USA, an older gentleman had spectacular hand carved wooden pieces on display, many priced in the thousands of dollars, his sales were slow to say the least, across the way was a couple with machine made wooden plaques and signs that were selling quickly, as soon as one would be sold an identical replacement was displayed to be quickly sold.<br> <br>Personally, I get more satisfaction selling an original for $400.us than 50 prints of the same piece for $15.us as I'm did the old wood carver who had an intimacy with both his work and his patron.
Original works of art are great, but we can't all afford to buy them or have the talent &amp; time to create originals. I am glad that there are collectors who can afford to spend thousands on great craftsmanship, thereby employing artisans and keeping skills alive. (serious, NOT sarcastic) The reality is that most of us can only view such pieces in a museum and have to settle for reproductions in our own homes. <br> <br>I've got a Van Gough print hanging on the wall, but my favorite art piece is an original watercolor bass done by by my son. Both have their merits and both evoke emotions.
cat, you're right in every aspect, art is in the eye of the beholder and without well off patrons many artists would never survive. <br><br> Modern art is often defined by the controversy it causes, I surrender to this sampling of the proletariat and admit this piece surpasses that test.<br><br>I've sold pieces that I wasn't sure I even wanted to display and pieces that I was sure would sell sit and collect dust. So I am far from being an authority on what is or is not &quot;art&quot; <br><br>My mom has a piece I painted 35 yrs ago or so, it's prominently displayed in her front hall, I cringe every time I see it but she won't even consider replacing it. But that's Mom.. I have a piece my 4yo grandson painted displayed along side art I've received from other artists, is it &quot;art&quot;? As Pop, I think so, from the comments it receives, it could really be.<br><br> The eye of the beholder wields a heavy hammer
I guess it's OK if you're into squid, or is it an octopus?
the machine didn't draw the original art. <br><br>It is only an elaborate tool used to precisely transfer the art from one medium (the paper) to another (the myrtlewood). <br><br>I think the drawing that produced the carving is full of soul.<br><br>
+1 <br>

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