Long time I have not posted any entries, so I wanted to make an example of something that I think is one of the major utilities have a CNC: Do engravings.
On the Internet there are a variety of engravings in STL format, ready to open with Vectric Aspire, Artcam, etc, and is extremely easy to set up:
First adjust the scale, and place it on the site as the piece of wood that we have, set up a roughing and then finishing. This is where most of the time duration of the machining resides.
Since I have no experience yet, I have scheduled 0.5 mm feed per pass, which meant a 55min finish machining. This is the result:
And now the finishing phase:
And this is the final result:
Obviously, the result of an advance of 0.5 mm means a definition such as the one shown in the pictures. For me it is relatively bad, I would have liked a much more defined finish, but surely for these dimensions, would have had to use an advance of 0.2 or even 0.1 mm per pass, which would have lasted an average of 3 hours machining.
Since the piece was already made, I have tried to improve the finish, trying to sand it without removing the general definition. Use sandpaper did not seem like a good idea, because it was done as normal levels, clearing the way of the horse. So to hide the machining grooves, I have given a pass with a metal sponge. It was not a great solution, but it has been a bit sneaky. After a bit of bitumen of Judea, to darken the background and shadows, and get more highlight the main form, the horse.
This has been the result, after many tests:
Not my best work, but in what have been many tests to leave a good finish, the result was not bad after all.
Of course, you have in Downloads section the file for this engraving